PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

STEREO AUDIO CODEC WITH USB INTERFACE,

SINGLE-ENDED ANALOG INPUT/OUTPUT AND S/PDIF

FEATURES

PCM2900: Without S/PDIF

PCM2902: With S/PDIF

On-Chip USB Interface:

With Full-Speed Transceivers
Fully Compliant With USB 1.1

Specification

Certified by USB-IF
Partially Programmable Descriptors

(1)

USB Adaptive Mode for Playback
USB Asynchronous Mode for Record
Bus Powered

16-Bit Delta Sigma ADC and DAC

Sampling Rate:

DAC: 32, 44.1, 48 kHz
ADC: 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz

On-Chip Clock Generator:

 With Single 12-MHz Clock Source

Single Power Supply: 5 V TYP (V

BUS

)

Stereo ADC Analog Performance at
V

BUS

= 5 V:

THD+N = 0.01%
SNR = 89 dB
Dynamic Range = 89 dB
Decimation Digital Filter
Passband Ripple =

0.05 dB

Stopband Attenuation = 65 dB
Single-Ended Voltage Input
Antialiasing Filter Included
Digital LCF Included

Stereo DAC Analog Performance at
V

BUS

= 5 V:

THD+N = 0.005%
SNR = 96 dB

Dynamic Range = 93 dB
Oversampling Digital Filter
Passband Ripple =

0.1 dB

Stopband Attenuation = 43 dB
Single-Ended Voltage Output
Analog LPF Included

Multifunctions:

 HID Volume

Control and Mute Control

 Suspend Flag

Package: 28-Pin SSOP, Lead-Free Product

APPLICATIONS

USB Audio Speaker

USB Headset

USB Monitor

USB Audio Interface Box

DESCRIPTION

The PCM2900/2902 is Texas Instruments single-chip
USB stereo audio codec with USB 1.1 compliant
full-speed protocol controller and S/PDIF (only
PCM2902). The USB protocol controller works with no
software code, but the USB descriptors can be modified
in some areas (ex. vendor ID/product ID). The
PCM2900/2902 employs a USB data tracking system
named sampling period adaptive controlled tracking
(SpAct

), which is TI's audio clock recovery

architecture. The on-chip analog PLLs with the SpAct
enables independent playback and record sampling
rates with low clock jitters.

Clocked by SpAct

Input signal is reclocked with the patented sampling
period adaptive controlled tracking system for
maximum quality.

PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.

www.ti.com

2002, Texas Instruments Incorporated

(1)The descriptor can be modified by changing a mask.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate
precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more

susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.

PACKAGING ORDERING INFORMATION

PCM2900

PRODUCT

PACKAGELEAD

PACKAGE

DESIGNATOR

SPECIFIED

TEMPERATURE

RANGE

PACKAGE

MARKING

ORDERING

NUMBER(1)

TRANSPORT

MEDIA

PCM2900E

SSOP 28

28DB

C to 85

PCM2900E

Rails

PCM2900E

SSOP-28

28DB

C to 85

PCM2900E

PCM2900E/2K

Tape and reel

(1) Models with a slash (/) are available only in tape and reel in the quantities indicated (e.g., /2K indicates 2000 devices per reel). Ordering 2000

pieces of PCM2900E/2K gets a single 2000 piece tape and reel.

PCM2902

PRODUCT

PACKAGELEAD

PACKAGE

DESIGNATOR

SPECIFIED

TEMPERATURE

RANGE

PACKAGE

MARKING

ORDERING

NUMBER(1)

TRANSPORT

MEDIA

PCM2902E

SSOP 28

28DB

C to 85

PCM2902E

Rails

PCM2902E

SSOP-28

28DB

C to 85

PCM2902E

PCM2902E/2K

Tape and reel

(1) Models with a slash (/) are available only in tape and reel in the quantities indicated (e.g., /2K indicates 2000 devices per reel). Ordering 2000

pieces of PCM2902E/2K gets a single 2000 piece tape and reel.

ABSOLUTE MAXIMUM RATINGS

over operating free-air temperature range unless otherwise noted(1)

PCM2900/PCM2902

UNIT

Supply voltage, VBUS

6.5

Ground voltage differences, AGNDC, AGNDP, AGNDX, DGND, DGNDU

0.1

Di it l i

SEL0, SEL1, DIN

0.3 to 6.5

Digital input voltage

D+, D, HID0, HID1, HID2, XTI, XTO, DOUT, SSPND

0.3 to (VDDI + 0.3)

VINL, VINR, VCOM, VOUTR, VOUTL

0.3 to (VCCCI + 0.3)

Analog input voltage

VCCCI, VCCP1I, VCCP2I, VCCXI, VDDI

0.3 to 4

Input current (any pins except supplies)

Ambient temperature under bias

40 to 125

Storage temperature, Tstg

55 to 150

Junction temperature TJ

150

Lead temperature (soldering)

260

C, 5 s

Package temperature (IR reflow, peak)

260

(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

ELECTRICAL CHARACTERISTICS

all specifications at TA = 25

C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted(1)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Digital Input/Output

Host interface

Apply USB Revision 1.1,
full speed

Audio data format

USB isochronous data format

Input Logic

D+, D

3.3

VIH

High level input voltage

XTI, HID0, HID1, and HID2

2.52

3.3

VDC

VIH

High-level input voltage

SEL0, SEL1

5.25

VDC

DIN, PCM2902

2.52

5.25

D+, D

0.8

VIL

Low level input voltage

XTI, HID0, HID1, and HID2

0.9

VDC

VIL

Low-level input voltage

SEL0, SEL1

0.8

VDC

DIN, PCM2902

0.9

D+, D, XTI, SEL0, SEL1

VIN = 3.3 V

IIH

High-level input current

HID0, HID1, and HID2

VIN = 3.3 V

IIH

High level in ut current

DIN, PCM2902

VIN = 3.3 V

100

D+, D, XTI, SEL0, SEL1

VIN = 0 V

IIL

Low-level input current

HID0, HID1, and HID2

VIN = 0 V

IIL

Low level in ut current

DIN, PCM2902

VIN = 0 V

Output Logic

D+, D

2.8

VOH

High-level output voltage

DOUT, PCM2902

IOH = 4 mA

2.8

VDC

VOH

High level out ut voltage

SSPND

IOH = 2 mA

2.8

VDC

D+, D

0.3

VOL

Low-level output voltage

DOUT, PCM2902

IOL = 4 mA

0.5

VDC

VOL

Low level out ut voltage

SSPND

IOL = 2 mA

0.5

VDC

Clock Frequency

Input clock frequency, XTI

11.994

12.006

MHz

ADC Characteristics

Resolution

8, 16

bits

Audio data channel

1, 2

channel

(1) fIN = 1 kHz, using Audio Precision System II, RMS mode with 20-kHz LPF, 400-Hz HPF in calculation.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

ELECTRICAL CHARACTERISTICS

all specifications at TA = 25

C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted(1)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Clock Frequency

Sampling frequency

8, 11.025, 16, 22.05, 32, 44.1, 48

kHz

DC Accuracy

Gain mismatch channel-to-channel

%FSR

Gain error

%FSR

Bipolar zero error

%FSR

Dynamic Performance(1)

VCCCI = 3.67 V, VIN = 0.5 dB(2)

0.01%

0.02%

THD+N

Total harmonic distortion plus noise

VIN = 0.5 dB(3)

0.1%

THD+N

Total harmonic distortion lus noise

VIN = 60 dB

Dynamic range

A-weighted

SNR

Signal-to-noise ratio

A-weighted

Channel separation

Analog Input

Input voltage

0.6

VCCCI

Vpp

Center voltage

0.5

VCCCI

Input impedance

Antialiasing filter frequency response

3 dB

150

kHz

Antialiasing filter frequency response

fIN = 20 kHz

0.08

Digital Filter Performance

Passband

0.454 fS

Stopband

0.583 fS

Passband ripple

0.05

Stopband attenuation

Delay time

17.4/fS

LCF frequency response

3 dB

0.078fS

MHz

DAC Characteristics

Resolution

8, 16

bits

Audio data channel

1, 2

channel

Clock Frequency

Sampling frequency

32, 44.1, 48

kHz

(1) fIN = 1 kHz, using Audio Precision System II, RMS mode with 20-kHz LPF, 400-Hz HPF in calculation.

(2) Using external voltage regulator for VCCCI (as shown in Figure 7, using with REG103xA-A
(3) Using internal voltage regulator for VCCCI (as shown in Figure 9)

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

ELECTRICAL CHARACTERISTICS

all specifications at TA = 25

C, VBUS = 5 V, fS = 44.1 kHz, fIN = 1 kHz, 16-bit data, unless otherwise noted(1)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

DC Accuracy

Gain mismatch channel-to-channel

%FSR

Gain error

%FSR

Bipolar zero error

%FSR

Dynamic Performance(1)

THD+N

Total harmonic distortion plus noise

VOUT = 0 dB

0.005%

0.016%

THD+N

Total harmonic distortion plus noise

VOUT = 60 dB

Dynamic range

EIAJ, A-weighted

SNR

Signal-to-noise ratio

EIAJ, A-weighted

Channel separation

Analog Output

Output voltage

0.6

VCCCI

Vpp

Center voltage

0.5

VCCCI

Load impedance

AC coupling

LPF frequency response

3 dB

250

kHz

LPF frequency response

f = 20 kHz

0.03

Digital filter performance

Passband

0.445 fS

Stopband

0.555

Passband ripple

0.1

Stopband attenuation

Delay time

14.3 fS

Power Supply Requirements

VBUS

Voltage range

4.35

5.25

VDC

Supply current

ADC, DAC operation

Supply current

Suspend mode(2)

210

Power dissipation

ADC, DAC operation

280

352

Power dissipation

Suspend mode(2)

1.05

Internal power supply voltage

VCCCI, VCCP1I,
VCCP2I, VCCXI, and VDDI

3.25

3.35

3.5

VDC

Temperature Range

Operation temperature

Thermal resistance

28-pin SSOP

100

C/W

(1) fOUT = 1 kHz, using Audio Precision System II, RMS mode with 20-kHz LPF, 400-Hz HPF.
(2) Under USB suspend state

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

PCM2900 Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

SSPND

Suspend flag, active low (Low: suspend, High: operational)

AGNDC

Analog ground for codec

AGNDP

Analog ground for PLL

AGNDX

Analog ground for oscillator

I/O

USB differential input/output minus(1)

D+

I/O

USB differential input/output plus(1)

DGND

Digital ground

DGNDU

Digital ground for USB transceiver

HID0

HID key state input (mute), active high(3)

HID1

HID key state input (volume up), active high(3)

HID2

HID key state input (volume down), active high(3)

SEL0

Must be set to high(5)

SEL1

Must be set to high(5)

TEST0

Test pin, must be connected to GND

TEST1

Test pin, must be left open

VBUS

Connect to USB power (VBUS)

VCCCI

Internal analog power supply for codec(4)

VCCP1I

Internal analog power supply for PLL(4)

VCCP2I

Internal analog power supply for PLL(4)

VCCXI

Internal analog power supply for oscillator(4)

VCOM

Common for ADC/DAC (VCCCI/2) (4)

VDDI

Internal digital power supply(4)

VINL

ADC analog input for L-channel

VINR

ADC analog input for R-channel

VOUTL

DAC analog output for L-channel

VOUTR

DAC analog output for R-channel

XTI

Crystal oscillator input(2)

XTO

Crystal oscillator output

(1) LV-TTL level
(2) 3.3-V CMOS level input
(3) 3.3-V CMOS level input with internal pulldown. This pin informs the PC of serviceable control signals such as mute, volume up, or volume down,

which has no connection with the internal DAC or ADC directly. See the volume control and mute control section.

(4) Connect a decouple capacitor to GND
(5) TTL Schmitt trigger, 5 V tolerant

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

PCM2902 Terminal Functions

TERMINAL

I/O

DESCRIPTIONS

NAME

PIN

I/O

DESCRIPTIONS

SSPND

Suspend flag, active low (Low: suspend, High: operational)

AGNDC

Analog ground for codec

AGNDP

Analog ground for PLL

AGNDX

Analog ground for oscillator

I/O

USB differential input/output minus(1)

D+

I/O

USB differential input/output plus(1)

DGND

Digital ground

DGNDU

Digital ground for USB transceiver

DIN

S/PDIF input(5)

DOUT

S/PDIF output

HID0

HID key state input (mute), active high(3)

HID1

HID key state input (volume up), active high(3)

HID2

HID key state input (volume down), active high(3)

SEL0

Must be set to high(6)

SEL1

Must be set to high(6)

VBUS

Connect to USB power (VBUS)

VCCCI

Internal analog power supply for codec(4)

VCCP1I

Internal analog power supply for PLL(4)

VCCP2I

Internal analog power supply for PLL(4)

VCCXI

Internal analog power supply for oscillator(4)

VCOM

Common for ADC/DAC (VCCCI/2) (4)

VDDI

Internal digital power supply(4)

VINL

ADC analog input for L-channel

VINR

ADC analog input for R-channel

VOUTL

DAC analog output for L-channel

VOUTR

DAC Analog output for R-channel

XTI

Crystal oscillator input(2)

XTO

Crystal oscillator output

(1) LV-TTL level
(2) 3.3-V CMOS level input
(3) 3.3-V CMOS level input with internal pulldown. This pin informs the PC of serviceable control signals such as mute, volume up, or volume down,

which has no connection with the internal DAC or ADC directly. See the volume control and mute control section.

(4) Connect a decouple capacitor to GND
(5) 3.3-V CMOS level input with internal pulldown, 5 V tolerant
(6) TTL Schmitt trigger, 5 V tolerant

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

PCM2902 FUNCTIONAL BLOCK DIAGRAM

SSPND

S/PDIF Decoder

DIN

Lock

ADC

VINL

VINR

VCOM

FIFO

Selector

Analog

PLL

Analog

PLL

FIFO

DAC

VOUTL

VOUTR

S/PDIF Encoder

DOUT

XTI

XTO

12 MHz

PLL (x8)

96 MHz

Tracker
(SpAct)

USB

Protocol

Controller

Power

Manager

ISO-In

Endpoint

Control

Endpoint

ISO-Out

Endpoint

HID

Endpoint

USB SIE

D+

XCVR

SEL0
SEL1

HID0
HID1
HID2

VBUS

5-V to 3.3-V Voltage Regulator

VCCCI VCCP1I VCCP2I VCCXI

VDDI

DGNDU

DGND

AGNDX

AGNDP

AGNDC

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

TYPICAL CHARACTERISTICS

ADC

Figure 1

0.03

0.04

0.05

0.06

0.07

0.08

0.09

0.10

50

25

100

TA Free-Air Temperature 

THD+N

otal Harmonic Distortion + Noise

TOTAL HARMONIC DISTORTION + NOISE at 0.5 dB

FREE-AIR TEMPERATURE

0.010

0.009

0.004

0.003

0.005

0.008

0.007

0.006

Figure 2

50

25

100

TA Free-Air Temperature 

Dynamic Range and SNR

DYNAMIC RANGE and SNR

FREE-AIR TEMPERATURE

SNR

Dynamic Range

Figure 3

0.03

0.04

0.05

0.06

0.07

0.08

0.09

0.10

4.0

4.5

5.0

5.5

VCC Supply Voltage V

THD+N

otal Harmonic Distortion + Noise

TOTAL HARMONIC DISTORTION + NOISE at 0.5 dB

SUPPLY VOLTAGE

0.010

0.009

0.004

0.003

0.005

0.008

0.007

0.006

Figure 4

4.0

4.5

5.0

5.5

VCC Supply Voltage V

Dynamic Range and SNR

DYNAMIC RANGE and SNR

SUPPLY VOLTAGE

SNR

Dynamic Range

All specifications at TA = 25

C, VBUS = 5 V, fS = 44.1 kHz, fin = 1 kHz, 16-bit data, unless otherwise noted, if using the REG 103xA-A.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

ADC (CONTINUED)

Figure 5

0.03

0.04

0.05

0.06

0.07

0.08

0.09

0.10

fS Sampling Frequency kHz

THD+N

otal Harmonic Distortion + Noise

TOTAL HARMONIC DISTORTION + NOISE at 0.5 dB

SAMPLING FREQUENCY

0.010

0.009

0.004

0.003

0.005

0.008

0.007

0.006

Figure 6

fS Sampling Frequency kHz

Dynamic Range and SNR

DYNAMIC RANGE and SNR

SAMPLING FREQUENCY

SNR

Dynamic Range

DAC

Figure 7

0.03

0.04

0.05

0.06

0.07

0.08

50

25

100

TA Free-Air Temperature 

THD+N

otal Harmonic Distortion + Noise

TOTAL HARMONIC DISTORTION + NOISE at 0 dB

FREE-AIR TEMPERATURE

0.008

0.004

0.003

0.005

0.007

0.006

Figure 8

50

25

100

TA Free-Air Temperature 

Dynamic Range and SNR

DYNAMIC RANGE and SNR

FREE-AIR TEMPERATURE

SNR

Dynamic Range

All specifications at TA = 25

C, VBUS = 5 V, fS = 44.1 kHz, fin = 1 kHz, 16-bit data, unless otherwise noted, if using the REG 103xA-A.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

DAC (CONTINUED)

Figure 9

0.03

0.04

0.05

0.06

0.07

0.08

4.0

4.5

5.0

5.5

VCC Supply Voltage V

THD+N

otal Harmonic Distortion + Noise

TOTAL HARMONIC DISTORTION + NOISE at 0 dB

SUPPLY VOLTAGE

0.008

0.004

0.003

0.005

0.007

0.006

Figure 10

4.0

4.5

5.0

5.5

VCC Supply Voltage V

Dynamic Range and SNR

DYNAMIC RANGE and SNR

SUPPLY VOLTAGE

SNR

Dynamic Range

Figure 11

0.03

0.04

0.05

0.06

0.07

0.08

fS Sampling Frequency kHz

THD+N

otal Harmonic Distortion + Noise

TOTAL HARMONIC DISTORTION + NOISE at 0 dB

SAMPLING FREQUENCY

0.008

0.004

0.003

0.005

0.007

0.006

Figure 12

fS Sampling Frequency kHz

Dynamic Range and SNR

DYNAMIC RANGE and SNR

SAMPLING FREQUENCY

SNR

Dynamic Range

All specifications at TA = 25

C, VBUS = 5 V, fS = 44.1 kHz, fin = 1 kHz, 16-bit data, unless otherwise noted, if using the REG 103xA-A.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

SUPPLY CURRENT

I CC

Suspend Supply Current

4.00

4.25

4.50

4.75

5.00

5.25

5.50

VDD Supply Voltage V

I CC

Operational Supply Current

OPERATIONAL and SUSPEND

SUPPLY CURRENT

SUPPLY VOLTAGE

Operational

Suspend

0.30

0.28

0.22

0.20

0.26

0.24

Figure 13

Figure 14

fS Sampling Frequency kHz

I CC

Operational Supply Current

OPERATIONAL SUPPLY CURRENT

SAMPLING FREQUENCY

ADC and DAC

Figure 15

0.10

0.15

0.20

0.25

0.30

0.35

0.40

40

20

100

TA Free-Air Temperature 

I CC

Suspend Supply Current

SUSPEND SUPPLY CURRENT

FREE-AIR TEMPERATURE

USB Spec Limit for Device (0.3 mA)

All specifications at TA = 25

C, VBUS = 5 V, fS = 44.1 kHz, fin = 1 kHz, 16-bit data, unless otherwise noted, if using the REG 103xA-A.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

ADC DIGITAL DECIMATION FILTER FREQUENCY RESPONSE

Figure 16

Frequency [x fS]

160

140

120

100

80

60

40

20

Amplitude

OVERALL CHARACTERISTICS

Figure 17

Frequency [x fS]

100

90

80

70

60

50

40

30

20

10

0.0

0.2

0.4

0.6

0.8

1.0

Amplitude

STOPBAND ATTENUATION

Figure 18

Frequency [x fS]

0.8

0.6

0.4

0.2

0.0

0.2

0.0

0.1

0.2

0.3

0.4

0.5

Amplitude

PASSBAND RIPPLE

0.0

Figure 19

Frequency [x fS]

20

16

12

0.46

0.48

0.50

0.52

0.54

Amplitude

TRANSIENT BAND RESPONSE

All specifications at TA = 25

C, VBUS = 5 V, fS = 44.1 kHz, fin = 1 kHz, 16-bit data, unless otherwise noted, if using the REG 103xA-A.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

ADC DIGITAL HIGH PASS FILTER FREQUENCY RESPONSE

Figure 20

Frequency [x fS/1000]

100

90

80

70

60

50

40

30

20

10

0.0

0.1

0.2

0.3

0.4

Amplitude

STOPBAND CHARACTERISTIC

Figure 21

Frequency [x fS/1000]

1.0

0.8

0.6

0.4

0.2

0.0

Amplitude

PASSBAND CHARACTERISTIC

0.0

ADC ANALOG ANTIALIASING FILTER FREQUENCY RESPONSE

Figure 22

50

40

30

20

10

f Frequency kHz

Amplitude

STOPBAND CHARACTERISTIC

100

10k

Figure 23

1.0

0.8

0.6

0.4

0.2

0.0

f Frequency kHz

Amplitude

PASSBAND CHARACTERISTIC

0.01

100

0.1

0.0

All specifications at TA = 25

C, VBUS = 5 V, fS = 44.1 kHz, fin = 1 kHz, 16-bit data, unless otherwise noted, if using the REG 103xA-A.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

ADC DIGITAL INTERPOLATION FILTER FREQUENCY RESPONSE

Figure 24

Frequency [x fS]

100

90

80

70

60

50

40

30

20

10

Amplitude

STOPBAND ATTENUATION

Figure 25

Frequency [x fS]

0.8

0.6

0.4

0.2

0.0

0.2

0.0

0.1

0.2

0.3

0.4

0.5

Amplitude

PASSBAND RIPPLE

0.0

Frequency [x fS]

20

18

16

14

12

10

0.46

0.47

0.48

0.49

0.50

0.51

0.52

0.53

0.54

Amplitude

TRANSIENT BAND RESPONSE

Figure 26

All specifications at TA = 25

C, VBUS = 5 V, fS = 44.1 kHz, fin = 1 kHz, 16-bit data, unless otherwise noted, if using the REG 103xA-A.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

DAC ANALOG FIR FILTER FREQUENCY RESPONSE

Figure 27

50

40

30

20

10

Frequency [x fS]

Amplitude

STOPBAND CHARACTERISTIC

Figure 28

0.8

0.6

0.4

0.2

0.0

0.2

0.0

0.1

0.2

0.3

0.4

0.5

Frequency [x fS]

Amplitude

PASSBAND CHARACTERISTIC

0.0

DAC ANALOG LOW PASS FILTER FREQUENCY RESPONSE

Figure 29

50

40

30

20

10

f Frequency kHz

Amplitude

STOPBAND CHARACTERISTIC

100

10k

Figure 30

1.0

0.8

0.6

0.4

0.2

0.0

f Frequency kHz

Amplitude

PASSBAND CHARACTERISTIC

0.01

100

0.1

0.0

All specifications at TA = 25

C, VBUS = 5 V, fS = 44.1 kHz, fin = 1 kHz, 16-bit data, unless otherwise noted, if using the REG 103xA-A.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

USB INTERFACE

Control data and audio data are transferred to the PCM2900/2902 via D+ (pin 1) and D (pin 2). All data to/from
the PCM2900/2902 is performed in full speed. The device descriptor can be modified upon request, contact
a Texas Instruments representative for details (see Table 1).

Table 1. Device Descriptor

USB revision

1.1 compliant

Device class

0x00 (device defined interface level)

Device sub class

0x00 (not specified)

Device protocol

0x00 (not specified)

Max packet size for endpoint 0

8 byte

Vendor ID

0x08BB (default value, can be modified)

Product ID

0x2900 / 0x2902 (default value, can be modified)

Device release number

1.0 (0x0100)

Number of configurations

Vendor strings

Burr-Brown from TI (default value, can be modified)

Product strings

USB audio codec (default value, can be modified)

Serial number

Not supported

The configuration descriptor can be modified upon request, contact your representative for details (see
Table 2).

Table 2. Configuration Descriptor

Interface

Four interfaces

Power attribute

0x80 (Bus powered,no remote wakeup)

Max power

0x32 (100 mA. Default value, can be modified)

The string descriptor can be modified upon request, contact a Texas Instruments representative for details (see
Table 3).

Table 3. String Descriptor

0x0409

Burr-Brown from TI (default value, can be modified)

USB audio codec (default value, can be modified)

DEVICE CONFIGURATION

Figure 31 illustrates the USB audio function topology. The PCM2900/2902 has four interfaces. Each interface
is constructed by alternative settings.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

Analog Out

Analog In

Default

Endpoint

Endpoint #2

(IF #1)

Audio Streaming

Interface

Endpoint #0

Endpoint #4

(IF #2)

Audio Streaming

Interface

Endpoint #5

(IF #3)

HID Interface

TID1

UID3

TID5

TID2

TID4

Standard Audio Control Interface (IF #0)

PCM2902

Figure 31. USB Audio Function Topology

Interface #0

Interface #0 is for the control interface. Alternative setting #0 is the only possible setting for interface #0.
Alternative setting #0 describes the standard audio control interface. A terminal constructs the audio control
interface. The PCM2900/2902 has five terminals as follows:

Input terminal (IT #1) for isochronous-out stream

Output terminal (OT #2) for audio analog output

Feature unit (FU #3) for DAC digital attenuator

Input terminal (IT #4) for audio analog input

Output terminal (OT #5) for isochronous-in stream

Input terminal #1 is defined as USB stream (terminal type 0x0101). Input terminal #1 can accept 2-channel audio
streams constructed by left and right channels. Output terminal #2 is defined as a speaker (terminal type
0x0301). Input terminal #4 is defined as microphon (terminal type 0x0201). Output terminal #5 is defined as
a USB stream (terminal type 0x0101). Output terminal #5 can generate 2-channel audio streams constructed
by left and right channels. Feature unit #3 supports the following sound control features.

Volume control

Mute control

The built-in digital volume controller can be manipulated by an audio class specific request from 0 dB to 64 dB
in 1-dB steps. Changes are made by incrementing or decrementing by one step (1 dB) for every 1/f

time interval

until the volume level has reached the requested value. Each channel can be set for different values. The master

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

volume control is not supported. A request to the master volume is stalled and ignored. The built-in digital mute
controller can be manipulated by audio class specific request. A master mute control request is acceptable. A
request to an individual channel is stalled and ignored.

Interface #1

Interface #1 is for audio streaming data out interface. Interface #1 has the following seven alternative settings.
Alternative setting #0 is the zero bandwidth setting. All other alternative settings are operational settings.

ALTERNATIVE

SETTING

DATA FORMAT

TRANSFER

MODE

SAMPLING RATE

(kHz)

Zero Bandwidth

16 bit

Stereo

2s complement (PCM)

Adaptive

32, 44.1, 48

16 bit

Mono

2s complement (PCM)

Adaptive

32, 44.1, 48

8 bit

Stereo

2s complement (PCM)

Adaptive

32, 44.1, 48

8 bit

Mono

2s complement (PCM)

Adaptive

32, 44.1, 48

8 bit

Stereo

Offset binary (PCM8)

Adaptive

32, 44.1, 48

8 bit

Mono

Offset binary (PCM8)

Adaptive

32, 44.1, 48

Interface #2

Interface #2 is for the audio streaming data in the interface. Interface #2 has the following 15 alternative settings.
Alternative setting #0 is the zero bandwidth setting. All other alternative settings are operational settings.

ALTERNATIVE

SETTING

DATA FORMAT

TRANSFER

MODE

SAMPLING RATE

(kHz)

Zero Bandwidth

16 bit

Stereo

2s complement (PCM)

Asynchronous

16 bit

Mono

2s complement (PCM)

Asynchronous

16 bit

Stereo

2s complement (PCM)

Asynchronous

44.1

16 bit

Mono

2s complement (PCM)

Asynchronous

44.1

16 bit

Stereo

2s complement (PCM)

Asynchronous

16 bit

Mono

2s complement (PCM)

Asynchronous

16 bit

Stereo

2s complement (PCM)

Asynchronous

22.05

16 bit

Mono

2s complement (PCM)

Asynchronous

22.05

16 bit

Stereo

2s complement (PCM)

Asynchronous

16 bit

Mono

2s complement (PCM)

Asynchronous

8 bit

Stereo

2s complement (PCM)

Asynchronous

8 bit

Mono

2s complement (PCM)

Asynchronous

8 bit

Stereo

2s complement (PCM)

Asynchronous

8 bit

Mono

2s complement (PCM)

Asynchronous

Interface #3

Interface #3 is for interrupt data in interface. Alternative setting #0 is the only possible setting for interface #3.
Interface #3 constructs the HID consumer control device. Interface #3 reports the following three key statuses.

Mute (0xE209)

Volume up (0xE909)

Volume down (0xEA09)

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

Endpoints

The PCM2900/2902 has the following four endpoints.

Control endpoint (EP #0)

Isochronous-out audio data stream endpoint (EP #2)

Isochronous-in audio data stream endpoint (EP #4)

HID endpoint (EP #5)

The control endpoint is a default endpoint. The control endpoint is used to control all functions of the
PCM2900/2902 by the standard USB request and USB audio class specific request from the host. The
isochronous-out audio data stream endpoint is an audio sink endpoint, which receives the PCM audio data. The
isochronous-out audio data stream endpoint accepts the adaptive transfer mode. The isochronous-in audio
data stream endpoint is an audio source endpoint, which transmits the PCM audio data. The isochronous-in
audio data stream endpoint uses asynchronous transfer mode. The HID endpoint is an interrupt-in endpoint.
HID endpoint reports HID0, HID1, and HID2 pin status in every 32 ms.

The human interface device (HID) pins are defined as consumer control devices. The HID function is designed
as an independent endpoint from both isochronous-in and -out endpoints. This means that the result of affection
for the HID operation is depending on the host software. Typically, the HID function is affected for the primary
audio-out device.

Clock and Reset

The PCM2900/2902 requires a 12-MHz (

500 ppm) clock for the USB and audio function, which can be

generated by a built in crystal oscillator with a 12-MHz crystal resonator. The 12-MHz crystal resonator must
be connected to XTI (pin 21) and XTO (pin 20) with one high (1 M

) resistor and two small capacitors, which

capacitance's depends on the load capacitance of the crystal resonator. The external clock can be supplied from
XTI (pin 21), If the external clock is supplied, XTO (pin 20) must be left open. Because of no clock-disabling
signal, it is not recommended to use the external clock supply. SSPND

(pin 28) is unable to use clock disabling.

The PCM2900/2902 has an internal power-on reset circuit, which works automatically when V

BUS

(pin 3)

exceeds 2.5 V typical (2.7 V

2.2 V) and about 700

s is required until internal reset release.

Digital Audio Interface (PCM2902)

The PCM2902 employs both S/PDIF input and output. Isochronousout data from the host is encoded to the
S/PDIF output and the DAC analog output. Input data is selected as either S/PDIF or ADC analog input. When
device detect S/PDIF input and successfully locked received data, the isochronousout transfer data source
is automatically selected from S/PDIF itself, otherwise the data source is selected to ADC analog input.

Supported Input Data (PCM2902)

The following data formats are accepted by the S/PDIF input and output. All other data formats are unable to
use S/PDIF.

48-kHz 16-bit stereo

44.1-kHz 16-bit stereo

32-kHz 16-bit stereo

Mismatch between input data format and host command may cause unexpected results except in the following
conditions.

Record monaural format from stereo data input at the same data rate

Record 8-bit format from 16-bit data input at the same data rate

A combination between the above conditions is also accepted.

For the playback, all possible data rate source is converted to 16-bit stereo format at the same source data rate.

Copyright Management (PCM2902)

Isochronous-in data is affected by the serial copy management system (SCMS). Where receiving digital audio
data that is indicated as original data in the control bit, input digital audio data transfers to the host. If the data
is indicated as first generation or higher, transferred data is selected to analog input.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

Digital audio data output is always encoded as original with SCMS control.

The implementation of this feature is an option for the customer. Note that it is the user's responsibility whether
they implement this feature in their product or not.

INTERFACE SEQUENCE

Power On, Attach, and Play Back Sequence

The PCM2900/2902 is ready for setup when the reset sequence has finished and the USB bus is attached. After
connection has been established by setup, the PCM2900/2902 is ready to accept USB audio data. While
waiting, the audio data (idle state) and analog output are set to bipolar zero (BPZ).

When receiving the audio data, the PCM2900/2902 stores the first audio packet, which contained 1-ms audio
data, into the internal storage buffer. The PCM2900/2902 starts playing the audio data when detecting the
following start of frame (SOF) packet.

ÓÓÓ

D+/D

2.5 V (Typ.)

0 V

Internal Reset

Ready for Setup

ÓÓ

ÓÓÓ

SOF

ÓÓÓ

ÓÓ

Ready for Playback

ÓÓ

Bus Reset

Set Configuration

SOF

ÓÓ

BPZ

Bus Idle

5 V
(Typ.)

1st Audio Data

2nd Audio Data

VBUS (Pin 3)

SSPND

VOUTL

VOUTR

700

Device Setup

1 ms

Figure 32. Initial Sequence

Play, Stop, and Detach Sequence

When the host finishes or aborts the play back, the PCM2900/2902 stops playing after the last audio data has
played.

Record Sequence

The PCM2900/2902 starts the audio capture into the internal memory after receiving the SET_INTERFACE
command.

Suspend and Resume Sequence

The PCM2900/2902 enters the suspend state after it sees a constant idle state on the USB bus, approximately
5 ms. While the PCM2900/2902 enters the suspend state, SSPND flag (pin 28) is asserted. The
PCM2900/2902 wakes up immediately when detecting the non-idle state on the USB bus.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

D+/D

VOUTL

VOUTR

Audio Data

Last Audio Data

Detach

SOF

1 ms

ÓÓ

ÓÓÓ

ÓÓ

ÓÓÓ

VBUS (Pin 3)

Figure 33. Play, Stop, and Detach

D+/D

VINL

VINR

1 ms

SET_INTERFACE

Audio Data

IN Token

Audio Data

IN Token

Audio Data

IN Token

SOF

ÓÓ

ÓÓÓ

ÓÓ

Figure 34. Record Sequence

5 ms

D+/D

SSPND

Idle

ÓÓ

Active

Suspend

Figure 35. Suspend and Resume

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

PCM2900 TYPICAL CIRCUIT CONNECTION 1

Figure 36 illustrates a typical circuit connection for a high performance application. The circuit illustrated is for
information only. The whole board design should be considered to meet the USB specification as a USB
compliant product.

NOTE: C1, C2: 10

C3, C4, C7, C8: 1

F (These capacitors must be less than 2

C5, C6: 10 pF to 33 pF (depending on crystal resonator)
C9, C10, C11, C12: The capacitance may vary depending on design
IC1: REG103xAA (TI) or equivalent. Analog performance may vary depending on IC1.

D+

PCM2900

VBUS

DGNDU

HID0

HID1

HID2

SEL0

SEL1

VCCCI

SSPND

XTI

VDDI

DGND

TEST1

TEST0

XTO

VCCP2I

AGNDX

VCCXI

D+

MUTE/
Power
Down

AGNDC

VINL

VINR

VCOM

VCCP1I

VOUTL

VOUTR

AGNDP

1.5 k

x 3

1.5 k

GND

VBUS

C10

1 M

12 MHz

C11

C12

LPF,

Amp

LPF,

Amp

3.6 V 

3.85 V

12 k

22 k

OUT

GND

ADJ

IC1

Figure 36. Bus-Powered Configuration for High-Performance Application

NOTE:

The circuit illustrated above is for information only. The whole board design should be considered
to meet the USB specification as a USB compliant product.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

PCM2902 TYPICAL CIRCUIT CONNECTION 1

Figure 37 illustrates a typical circuit connection for a high performance application. The circuit illustrated is for
information only. The whole board design should be considered to meet the USB specification as a USB
compliant product.

NOTE: C1, C2: 10

C3, C4, C7, C8: 1

F (These capacitors must be less than 2

D+

PCM2902

VBUS

DGNDU

HID0

HID1

HID2

SEL0

SEL1

VCCCI

SSPND

XTI

VDDI

DGND

DOUT

DIN

XTO

VCCP2I

AGNDX

VCCXI

D+

MUTE/
Power
Down

AGNDC

VINL

VINR

VCOM

VCCP1I

VOUTL

VOUTR

AGNDP

1.5 k

x 3

1.5 k

GND

VBUS

C10

1 M

12 MHz

C11

C12

LPF,

Amp

LPF,

Amp

3.6 V 

3.85 V

12 k

22 k

OUT

GND

ADJ

IC1

Figure 37. Bus-Powered Configuration for High-Performance Application

NOTE:

The circuit illustrated above is for information only. The whole board design should be considered
to meet the USB specification as a USB compliant product.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

PCM2900 TYPICAL CIRCUIT CONNECTION 2

Figure 38 illustrates a typical circuit connection for a simple application. The circuit illustrated is for information
only. The whole board design should be considered to meet the USB specification as a USB compliant product.

NOTE: C1, C2: 10

C3, C4, C7, C8: 1

C5, C6: 10 pF to 33 pF (depending on crystal resonator)
C9, C10, C11, C12: The capacitance may vary depending on design
In this case analog perfomance of the A/D converter may degrade.

D+

PCM2900

VBUS

DGNDU

HID0

HID1

HID2

SEL0

SEL1

VCCCI

SSPND

XTI

VDDI

DGND

TEST1

TEST0

XTO

VCCP2I

AGNDX

VCCXI

D+

MUTE/
Power
Down

AGNDC

VINL

VINR

VCOM

VCCP1I

VOUTL

VOUTR

AGNDP

1.5 k

x 4

GND

VBUS

C10

1 M

12 MHz

C11

C12

LPF,

Amp

LPF,

Amp

Figure 38. Bus-Powered Configuration

NOTE:

The circuit illustrated above is for information only. The whole board design should be considered
to meet the USB specification as a USB compliant product.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

PCM2902 TYPICAL CIRCUIT CONNECTION 2

Figure 39 illustrates a typical circuit connection for a simple application. The circuit illustrated is for information
only. The whole board design should be considered to meet the USB specification as a USB compliant product.

NOTE: C1, C2: 10

C3, C4, C7, C8: 1

C5, C6: 10 pF to 33 pF (depending on crystal resonator)
C9, C10, C11, C12: The capacitance may vary depending on design
In this case analog perfomance of the A/D converter may degrade.

D+

PCM2902

VBUS

DGNDU

HID0

HID1

HID2

SEL0

SEL1

VCCCI

SSPND

XTI

VDDI

DGND

DOUT

DIN

XTO

VCCP2I

AGNDX

VCCXI

D+

MUTE/
Power
Down

AGNDC

VINL

VINR

VCOM

VCCP1I

VOUTL

VOUTR

AGNDP

1.5 k

x 4

GND

VBUS

C10

1 M

12 MHz

C11

C12

LPF,

Amp

LPF,

Amp

Figure 39. Bus-Powered Configuration

NOTE:

The circuit illustrated above is for information only. The whole board design should be considered
to meet the USB specification as a USB compliant product.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

APPLICATION INFORMATION

OPERATING ENVIRONMENT

To get the appropriate operation, one of the following operating systems must be working on the host PC that
has the USB port assured by the manufacturer. If the condition is fulfilled, the operation of the PCM2900/2902
does not depend upon the operating speed of the CPU.

Texas Instruments has confirmed following operating environments.

OS: Microsoft

Windows

98/98SE/Me Japanese/English Edition

Microsoft

Windows

2000 Professional Japanese/English Edition

Microsoft

Windows

XP Home/Professional Japanese/English Edition (For Windows

XP, use the

latest version of the USB audio driver that is available on Windows update site)

Apple Computer

Mac OS 9.1 or later Japanese/English Edition

Apple Computer

Mac OS X 10.0 or later English Edition

Apple Computer

Mac OS X 10.1 or later Japanese Edition (For Mac OS X 10.0 Japanese Edition, plug

and play does not work for USB audio device appropriately)

PC: Following PC-AT compatible computers for above OS (OS requirement must meet)

Motherboard using Intel

440BX or ZX chip set (using USB controller in the chip set)

Motherboard using Intel

i810 chip set (using USB controller in the chip set)

Motherboard using Intel

i815 chip set (using USB controller in the chip set)

Motherboard using Intel

i820 chip set (using USB controller in the chip set)

Motherboard using Intel

i845 chip set (using USB controller in the chip set)

Motherboard using Intel

i850 chip set (using USB controller in the chip set)

Motherboard using Apollo KT133 chip set (using USB controller in the chip set)

Motherboard using Apollo Pro plus chip set (using USB controller in the chip set)

Motherboard using MVP4 or MVP3 chip set (using USB controller in the chip set)

Motherboard using Aladdin V chip set (using USB controller in the chip set)

Motherboard using SiS530 or SiS559 chip set (using USB controller in the chip set)

Motherboard using SiS735 chip set (using USB controller in the chip set)

NOTE:

This does not mean that the operation of the PCM2900/2902 is not assured for the OS and PC
except for the ones listed. The OSs and PCs for which the operation of the PCM2900/2902 was
confirmed are written above.

PCM2900/2902 has been acknowledged in the USB compliance test. However, the
acknowledgement is just for the PCM2900/2902 from Texas Instruments. Be careful that the
acknowledgement is not for the customer's USB system using the PCM2900/2902.

PCM2900
PCM2902

SLES035A MARCH 2002 REVISED MAY 2002

www.ti.com

MECHANICAL DATA

DB (R-PDSO-G**)

PLASTIC SMALL-OUTLINE

4040065 /E 12/01

28 PINS SHOWN

Gage Plane

8,20
7,40

0,55

0,95

0,25

12,90

12,30

10,50

8,50

Seating Plane

9,90

7,90

10,50

9,90

0,38

5,60
5,00

0,22

6,50

0,05 MIN

5,90

DIM

A MAX

A MIN

PINS **

2,00 MAX

6,90

7,50

0,65

0,15

 8

0,10

0,09

0,25

NOTES:A. All linear dimensions are in millimeters.

B. This drawing is subject to change without notice.

C. Body dimensions do not include mold flash or protrusion not to exceed 0,15.
D. Falls within JEDEC MO-150

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,
enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
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and conditions of sale supplied at the time of order acknowledgment.

TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI's standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty. Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.

TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. To minimize the risks associated with customer products
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TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,
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Mailing Address:

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2002, Texas Instruments Incorporated

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