Document Outline
- WM9704M
- AMC97 Audio and Modem Codec
- Production Data, January 2001, Rev 3.2
- DESCRIPTION
- FEATURES
- APPLICATIONS
- BLOCK DIAGRAM
- PIN CONFIGURATION
- ORDERING INFORMATION
- ABSOLUTE MAXIMUM RATINGS
- RECOMMENDED OPERATING CONDITIONS
- ELECTRICAL CHARACTERISTICS
- PIN DESCRIPTION
- DETAILED TIMING DIAGRAMS
- AC-LINK LOW POWER MODE
- COLD RESET
- WARM RESET
- CLOCK SPECIFICATIONS
- DATA SETUP AND HOLD (50PF EXTERNAL LOAD)
- SIGNAL RISE AND FALL TIMES
- SYSTEM INFORMATION
- DEVICE DESCRIPTION
- INTRODUCTION
- OPERATIONAL MODES
- MODEM MODE
- REV 2.1 COMPLIANT 2-CHANNEL MODE
- GPIO PINS
- 3D STEREO ENHANCEMENT
- VARIABLE SAMPLE RATE SUPPORT
- GAIN CONTROL REGISTER LOCATION VERSUS MODE AND ID
- MASTER/SLAVE ID0/1 SUPPORT
- SLAVE CODEC REGISTER ACCESS DEFINITIONS
- CONTROL INTERFACE
- AC-LINK DIGITAL SERIAL INTERFACE PROTOCOL
- AC-LINK AUDIO OUTPUT FRAME (SDATA_OUT)
- AC-LINK AUDIO INPUT FRAME (SDATA_IN)
- AC-LINK LOW POWER MODE
- WAKING UP THE AC-LINK
- SERIAL INTERFACE REGISTER MAP DESCRIPTION
- POWERDOWN CONTROL/STATUS REGISTER (INDEX 26H)
- REV 2.1 REGISTERS (INDEX 28H T0 58H)
- MODEM REGISTERS (INDEX 3CH TO 56H)
- GPIO FUNCTION
- VENDOR RESERVED REGISTERS (INDEX 5AH AND 7AH)
- SERIAL INTERFACE REGISTER MAP
- RECOMMENDED EXTERNAL COMPONENTS
- RECOMMENDED EXTERNAL COMPONENTS VALUES
- RECOMMENDATIONS FOR 3.3V OPERATION
- PACKAGE DIMENSIONS
WM9704M
AMC'97 Audio and Modem Codec
Production Data, January 2001, Rev 3.2
WOLFSON MICROELECTRONICS LTD
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
Email: sales@wolfson.co.uk
http://www.wolfson.co.uk
Production Data datasheets contain final
specifications current on publication date.
Supply of products conforms to Wolfson
Microelectronics' Terms and Conditions.
2001 Wolfson Microelectronics Ltd
.
DESCRIPTION
WM9704M is a high quality audio codec compliant with the
AC'97 Revision 2.1 specification. The WM9704M has a
proprietary mode which can meet the requirements of an
AMC'97 codec. It performs full duplex 18-bit codec functions
from 8 to 48ksamples/s and offers excellent quality with
high SNR. Features include 3D sound and line-level
outputs. Support is also provided for variable sample rates
and master/slave mode operation.
In modem mode the device supports simultaneous modem
and stereo playback.
WM9704M is interchangeable with AC'97 Codecs from
Wolfson and other suppliers in the basic Revision 2.1 mode.
WM9704M is fully operable with 3.3V or 5V or mixed
3.3/5.0V supplies and is packaged in an industry standard
48-pin TQFP package.
FEATURES
4 DAC channels, stereo ADC
S/N ratio > 95dB
Variable rate audio and modem support
Analogue 3D stereo enhancement
Line level outputs
Master/slave ID selection
Low power implementation
3.3V or 5V operation
48-pin TQFP package
APPLICATIONS
Simultaneous modem operation and stereo playback
BLOCK DIAGRAM
(2) XTLIN
(3) XTLOUT
MUX
(37) MONOOUT
(39,41)
LINEOUT
(REAR)
(35,36)
LINEOUT
(FRONT)
(45) CID0
(46) CID1
(43,44,48)
GPIO[1:3]
(6) BITCLK
(10) SYNC
(8) SDATAIN
(5) SDATAOUT
(11) RESETB
(47) EAPD
(30) MODE0
(40) MODE1
REV. 2.1
SWITCH
REAR
STEREO
DAC
SRC
SERIAL
I/F
KEY:
MONO
STEREO
VOL/
MUTE
VOL/
MUTE
VOL/
MUTE
VOL/
MUTE
VOL/
MUTE
VOL/
MUTE
VOL/
MUTE
VOL/
MUTE
FRONT
STEREO
DAC
SRC
VOL/
MUTE
VOL/
MUTE
VOL/
MUTE
VOL/
MUTE
VOL/
MUTE
VOL/
MUTE
CD (18,20)
LINEIN (23,24)
VIDEO (16,17)
AUX (14,15)
PHONE (13)
PCBEEP (12)
MIC[1] (21)
MIC[2] (22)
0dB/
20dB
MASTER/
SLAVE
SELECT
GENERAL IO
SUPPORT
OSC
3D
VOL
STEREO
ADC
SRC
MUX
RECORD
MUX
AND
MUTE
SERIAL
I/F
WM9704M
WM9704M
Production Data
WOLFSON MICROELECTRONICS LTD
PD Rev 3.2 January 2001
2
PIN CONFIGURATION
ORDERING INFORMATION
DEVICE
TEMP. RANGE
PACKAGE
WM9704CFT/V
0 to 70
o
C
48-pin TQFP
GP
I
O
3
GP
I
O
1
GP
I
O
2
CID0
CID1
EAPD
M
O
N
OOU
T
A
V
DD2
LN
LV
LOU
T
L
MO
D
E
1
LN
LV
LOU
T
R
AVSS2
37
47 46 45 44 43 42 41 40 39 38
48
LI
N
E
I
N
R
CDL
MI
C
2
CDG
ND
CDR
MI
C
1
LI
N
E
I
N
L
AU
XR
PH
O
N
E
AU
XL
VID
E
O
L
VID
E
O
R
DVDD1
DVSS2
BITCLK
SDATAOUT
DVSS1
XTLOUT
XTLIN
SDATAIN
DVDD2
SYNC
RESETB
PCBEEP
LINEOUTR
MODE0
CAP1
CAP2
CX3D1
CX3D2
LINEOUTL
AVDD1
AVSS1
VREF
VREFOUT
AFILT1
25
31
30
29
28
27
26
36
35
34
33
32
1
9
8
7
6
5
4
3
2
12
11
10
24
23
16 17 18 19 20 21 22
13 14 15
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at
or beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical
Characteristics at the test conditions specified
ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible
to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage
of this device.
As per specifications IPC/JEDEC J-STD-020A and JEDEC A113-B, this product requires specific storage conditions prior to
surface mount assembly. It has been classified as having a Moisture Sensitivity Level of 2 and as such will be supplied in
vacuum-sealed moisture barrier bags.
CONDITION
MIN
MAX
Digital supply voltage
-0.3V
+7V
Analogue supply voltage
-0.3V
+7V
Voltage range digital inputs
DVSS -0.3V
DVDD +0.3V
Voltage range analogue inputs
AVSS -0.3V
AVDD +0.3V
Operating temperature range, T
A
0
o
C
+70
o
C
Storage temperature
-65
o
C
+150
o
C
Package body temperature (soldering 10 seconds)
+240
o
C
Package body temperature (soldering 2 minutes)
+183
o
C
Note:
1.
The digital supply voltage (DVDD) must always be less than or equal to the analogue supply voltage (AVDD).
Production Data
WM9704M
WOLFSON MICROELECTRONICS LTD
PD Rev 3.2 January 2001
3
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Digital supply range
DVDD1, DVDD2
-10%
3.3 to 5.0
+10%
V
Analogue supply range
AVDD1, AVDD2
-10%
3.3 to 5.0
+10%
V
Digital ground
DVSS1, DVSS2
0
V
Analogue ground
AVSS1, AVSS2
0
V
Difference DVSS to AVSS
-0.3
0
+0.3
V
Analogue supply current
DVDD, AVDD = 5V
35
mA
Digital supply current
DVDD, AVDD = 5V
25
mA
Standby supply current (all PRs set)
DVDD, AVDD = 5V
10
A
Analogue supply current
DVDD, AVDD = 3.3V
22
mA
Digital supply current
DVDD, AVDD = 3.3V
15
mA
Standby supply current (all PRs set)
DVDD, AVDD = 3.3V
6
A
ELECTRICAL CHARACTERISTICS
Test Characteristics:
AVDD = 5V, GND = 0V ..............T
A
= 0
o
C to +70
o
C, unless otherwise stated
DVDD = 3.3V, GND = 0V ..............T
A
= 0
o
C to +70
o
C, unless otherwise stated
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Digital Logic Levels (DVDD = 3.3 or 5.0V)
Input LOW level
V
IL
AVSS -0.3
0.8
V
Input HIGH level
V
IH
2.0
AVDD +0.3
V
Output LOW
V
OL
I
OL
= 2mA
0.1 x DVSS
V
Output HIGH
V
OH
I
OH
= 2mA
0.9 x DVDD
V
Analogue I/O Levels (Input signals on any inputs, Outputs on LINEOUT L, R and MONO)
Input level
Minimum input
impedance = 10k
AVSS
-100mV
AVDD
+100mV
V
Output level
Into 10kohm load
AVSS
+100mV
Near rail to
rail
AVDD
-100mV
V
Reference Levels
Reference input/output
CAP2
2/5 AVDD
AVDD/2
3/5 AVDD
V
CAP2 impedance
75
kohms
Mixer reference
VREF
Buffered
CAP2
V
MIC reference
VREFOUT
Buffered
CAP2
V
ADC reference
CAP1
Buffered
CAP2
V
DAC reference
AFILT1
Buffered
CAP2
V
MIDBUFF current sink
(pins CAP1, AFILT2, VREF
and VREFOUT)
AVDD = 5V
-5
-15
mA
MIDBUFF current source
(pins CAP1, AFILT1, VREF
and VREFOUT)
AVDD = 5V
5
15
mA
MIDBUFF current source
(pins CAP1, AFILT1, VREF
and VREFOUT)
AVDD = 3.3V
5
mA
WM9704M
Production Data
WOLFSON MICROELECTRONICS LTD
PD Rev 3.2 January 2001
4
Test Characteristics:
AVDD = 5V, GND = 0V ..............T
A
= 0
o
C to +70
o
C, unless otherwise stated
DVDD = 3.3V, GND = 0V ..............T
A
= 0
o
C to +70
o
C, unless otherwise stated
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
DAC Circuit Specifications (AVDD = 5V) 48kHz sampling
SNR A-weighted (Note 1)
85
96
dB
Full scale output voltage
V
REF
= 2.5V
1.0
Vrms
THD
-3dB output
74
90
%
Frequency response
20
19,200
Hz
Transition band
19,200
28,800
Hz
Stop band
28,800
Hz
Out of band rejection
-40
dB
Spurious tone reduction
-100
dB
PSRR
20 to 20kHz
40
dB
ADC Circuit Specifications (AVDD = 5V) 48kHz sampling
SNR A-weighted (Note 1)
75
85
dB
ADC input for full scale output
V
REF
= 2.5V
1.0
Vrms
THD
-6dBFS input
74
90
%
Frequency response
20
19,200
Hz
Transition band
19,200
28,800
Hz
Stop band
28,800
Hz
Stop band rejection
-74
dB
PSRR
20 to 20kHz
40
dB
Mixer Circuit Specifications (AVDD = 5V) 48kHz sampling
SNR CD path A-weighted (Note 1)
90
100
dB
SNR Other paths A-weighted
(Note 1)
85
95
dB
Maximum input voltage
AVSS
1.0
AVDD
Vrms
Maximum output voltage on
LINEOUT
1.0
1.8
Vrms
THD
74
90
%
Frequency response (+/-1dB)
20
20,000
Hz
Input impedance (CD inputs)
At any gain
10
15
kohm
At max gain
10
20
kohm
Input impedance (other mixer
inputs)
At 0db gain
100
kohm
At max gain
80
kohm
Input impedance MIC inputs
At 0db gain
10
15
kohm
PSRR
20 to 20kHz
40
dB
DAC Circuit Specifications (AVDD = 3.3V) 48kHz sampling
SNR A-weighted (Note 1)
96
dB
Full scale output voltage
V
REF
= 1.65V
0.7
Vrms
THD
-3dBFSsp output
90
%
Frequency response
20
19,200
Hz
Transition band
19,200
28,800
Hz
Stop band
28,800
Hz
Out of band rejection
-40
dB
Spurious tone reduction
-100
dB
PSRR
20 to 20kHz
40
dB
Production Data
WM9704M
WOLFSON MICROELECTRONICS LTD
PD Rev 3.2 January 2001
5
Test Characteristics:
AVDD = 5V, GND = 0V ..............T
A
= 0
o
C to +70
o
C, unless otherwise stated
DVDD = 3.3V, GND = 0V ..............T
A
= 0
o
C to +70
o
C, unless otherwise stated
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
ADC Circuit Specifications (AVDD = 3.3V) 48kHz sampling
SNR A-weighted (Note 1)
82
dB
ADC input for full scale output
V
REF
= 1.65V
0.7
Vrms
THD
-9dBFS input
80
%
Frequency response
20
19,200
Hz
Transition band
19,200
28,800
Hz
Stop band
28,800
Hz
Stop band rejection
-74
dB
PSRR
20 to 20kHz
40
dB
Mixer Circuit Specifications (AVDD = 3.3V) 48kHz sampling
SNR CD path A-weighted
(Note 1)
97
dB
SNR Other paths A-weighted
(Note 1)
92
dB
Maximum input voltage
0.7
Vrms
Maximum output voltage on
LINEOUT
0.7
Vrms
THD
-3dBV input
90
%
Frequency response (+/-1dB)
20
20,000
Hz
Input impedance (CD inputs)
At any gain
15
kohm
At max gain
20
kohm
Input impedance (other Mixer
inputs)
At 0db gain
100
kohm
At max gain
80
kohm
Input impedance MIC inputs
At 0db gain
15
kohm
PSRR
20 to 20kHz
40
dB
Clock Frequency Range
Crystal clock
24.576
MHz
BIT_CLK frequency
12.288
MHz
SYNC frequency
48.0
kHz
Note:
1.
SNR is the ratio of 0dB signal amplitude to noise floor with no signal, measured A-weighted over a 20Hz to 20kHz
bandwidth.
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