1/25

¡ Semiconductor

MSM7575

¡ Semiconductor

MSM7575

Multi-Function PCM CODEC

GENERAL DESCRIPTION

The MSM7575, developed for advanced digital cordless telephone systems, is a single channel
full duplex CODEC which performs mutual transcoding between the analog voice band signal
and the 64 kbps PCM serial data.
This device performs DTMF tone and several kinds of tone generation, transmit/receive data
mute and gain control, side-tone pass and its gain control, and VOX function.
Using advanced circuit technology, this device operates from a single 3 V power supply and
provides low power consumption.

FEATURES

· Single 3 V Power Supply Operation

: 2.7 V to 3.6 V

· Transmit/Receive Full-Duplex Single Channel Operation
·

· Transmit/Receive Synchronous Mode Only
·

· PCM Interface Data Format :

A-law/

-law/linear (2's complement) Selectable

· Serial PCM Transmission Data Rate :

64 kbps to 2048 kbps

· Low Power Consumption

Operating Mode :

24 mW Typ. (V

= 3.0 V)

Power-Down Mode :

0.03 mW Typ. (V

= 3.0 V)

· Two Analog Input Amplifier Stages:

Externally Gain Adjustable

· Analog Output Stage

Push-pull Drive (direct drive of 350 W + 120 nF)

· Master Clock Frequency :

9.600/19.200 MHz Selectable

· Transmit/Receive Mute, Transmit/Receive Programmable Gain Control
·

· Side Tone Path with Programmable Attenuation

(8-step Level Adjustment)

· Built-in DTMF Tone Generator
·

· Built-in Various Ringing Tones Generator
·

· Built-in Various Ring Back Tone Generator
·

· Control by Serial MCU Interface
·

· Built-in VOX Control

Transmit side

Voice/Silence Signal Detect

Receive side

Background Noise Generation

· Built-in Op-amps and Analog Switches for Various Analog Interfaces.
·

· Package:

64-pin plastic QFP

(QFP64-P-1414-0.80-BK)(Product name : 7575GS-BK)

E2U0025-29-82

This version: Aug. 1999

Previous version: Jan. 1998

2/25

¡ Semiconductor

MSM7575

BLOCK DIAGRAM

AIN2

GSX2

VOXI

PCMSO

Prefilter

AIN1+

GSX1

AOUT-

BPF

XSYNC

RSYNC

PCMRI

Postfilter

LPF

BCLK

PWI

AOUT+

-1

VFRO

AIN1-

-1

VOXO

Compand

Voice Signal

Detect

A/D

D/A

EXCK

PDN

RESET

MCU Interface

Clock/

Timing

ATT

SAO

-1

ATT

Expand

VREF

RINGC

AVIN

REF1

REF2

AIN3-

GSX3

AIN3+

AIN4-

GSX4

AIN4+

IO1

IO2

SW1

IO3

IO4

SW2

IO5

IO6

SW3

IO7

IO8

SW4

IO9

IO10

SW5

IO11

SW6

IO12

SW7

IO13

SW8

IO14

SW9

MCK

DEN

DOUT

DIN

TOUT1
TOUT2

TOUT3

SGB

Tone GEN.

Back ground

Noise Gen.

To each circuit

3/25

¡ Semiconductor

MSM7575

PIN CONFIGURATION (TOP VIEW)

VOXI

VOXO

DOUT

DIN

EXCK

DEN

PCMRI

PCMSO

RSYNC

XSYNC

BCLK

IO1

IO2

IO3

IO4

AIN3+

AIN3-

GSX3

AIN4+

AIN4-

GSX4

AIN1+

AIN1-

GSX1

AIN2

GSX2

SAO

VFRO

PWI

AOUT-

AOUT+

64-Pin Plastic QFP

IO5

IO6

IO7

IO8

IO9

IO10

IO11

IO12

IO13

IO14

SGB

MCK

PDN/RESET

TOUT3

TOUT2

TOUT1

RINGC

VDD

REF2

REF1

AVIN

NC : No connect pin

4/25

¡ Semiconductor

MSM7575

PIN AND FUNCTIONAL DESCRIPTIONS

AIN1+, AIN1, AIN2, GSX1, GSX2

Transmit analog input and the output for transmit gain adjustment. The pin AIN1 (AIN2)
connects to the inverting input of the internal transmit amplifier, and the pin AIN1+ connects to
the non-inverting input of the internal transmit amplifier. The pin GSX1 (GSX2) connects to
output of the internal transmit amplifier. Gain adjustment should be referred to Fig. 1.

VFRO, AOUT+, AOUT, PWI, SAO, RINGC

Used for the receive analog output and the output for receive gain adjustment. VFRO is an
output of the receive filter. AOUT+ and AOUT are differential analog signal outputs which can
directly drive Z

= 350 W + 120 nF or the 1.2 kW load. Gain adjustment should be referred to Fig.

1.
The ORed signal with the control register data CR4-B5 and the external pin RINGC determines
the output pins (AOUT+ and AOUT- /SAO+ and SAO-) for the speech signal and an acoustic
component of the sounder tone, DTMF tone, R tone, F tone, various kinds of tones at either the
VFRO pin or the SAO pin.

Figure 1 Analog Input/Output Interface

Transmit Gain: V

GSX2

/Vi

= (R2/R1)

¥ (R4/R3)

AIN1

GSX1

to ENCODER

from
DECODER

Differential
Analog
Output

Receive Gain: Vo/V

VFRO

= 2

¥ (R6/R5)

= 120 nF

+ 350

AIN2

GSX2

AOUT

PWI

VFRO

AOUT+

AIN1+

REF

0.1

Differential

Analog Input

Sounder Output
Signal

SAO

SELECT

RINGC

TOUT1

TOUT2

TOUT3

from MCU INT.

5/25

¡ Semiconductor

MSM7575

TOUT1, TOUT2, TOUT3

These are pins for outputs of the NOR gates whose inputs are the comparator output signal
between the SAO output level and the SG level, and each register signal stored by the MCU
interface.
The each output is NOR-gated with the comparator output and the invented signal of CR1-B7 at
TOUT3, the inverted signal of CR1-B6 at TOUT2, and the inverted signal of CR1-B5 at TOUT1.

AVIN, REF1, REF2

These pins are for inputs of two comparators internal to the device. AVIN is connected to each
non-inverting input of comparator1 and comparator2. REF1 is connected to an inverting input
of comparator1 and REF2 is connected to an inverting input of comparator2. The output of each
comparator is connected to the input of ENOR. The interval analog switch SW1 is ON/OFF
controlled by the output which is the logical OR of the ENOR and the CR5-B7 signal. When CR5-
B7 is at "0", the SW1 is turned to OFF if AVIN is within the voltage range of REF1 and REF2 and
the SW1 is turned to ON if AVIN is out of the voltage range of REF1 and REF2.

AIN3+, AIN3-, GSX3, AIN4+, AIN4-, GSX4

These pins are for inputs and outputs of the internal op-amps. Refer to BLOCK DIAGRAM for
the connection.

IO1 to IO14

These pins are for inputs and outputs of the internal analog switch. Refer to BLOCK DIAGRAM
and FUNCTIONAL DESCRIPTION for the connection and the control method.

X1, X2

Crystal oscillator connection pins. X2 is for the clock output pin. When a conventional external
clock is used, X1 should be connected to the ground, X2 should be left open, and the clock should
be input to the MCK pin.

MCK

9.6 MHz or
19.2 MHz

For the use of a self-oscilation circut

MSM7575

MCK

For the use of an external clock

MSM7575

9.6 MHz or
19.2 MHz

Figure 2 Connection to a Crystal Oscillator or an External Clock

6/25

¡ Semiconductor

MSM7575

SG, SGB

Analog signal ground output.
The output voltage is about 1.4 V. The bypass capacitors (10

F in parallel with 0.1

F ceramic

type) should be put between this pin and AG to get the specified noise characteristics. This
output voltage is 0 V during power-down.

Analog ground.

Digital ground.
This ground is separated from the analog signal ground(AG) in this device. The DG pin must be
kept as close to the AG pin possible on the PCB.

+3 V power supply.

PDN/RESET

Power down and reset control input.
"L" level makes the whole chip enter to power down state, and, at the same time, all of control
register data are reset to the initial state. Set this pin to "H" level during normal operating mode.
The power down state is controlled by a logical OR with CR0-B5 of the control register. When
using the pin PDN/RESET for the power down and reset control, CR0-B5 should be set to digital
"0".

MCK

Master clock input.
The frequency must be 9.6 MHz or 19.2 MHz. The applied clock frequency is selected by the
control register data CR0-B6. The master clock signal is allowed to be asynchronous with BCLK,
XSYNC, and RSYNC.

PCMSO

Transmit PCM data output.
This PCM output signal is output from MSB in synchronization with the rising edge of BCLK or
XSYNC. A pull-up resistor must be connected to this pin, because this output is configuared as
an open drain.
During power down, this output is at high impedance state.

7/25

¡ Semiconductor

MSM7575

PCMRI

Receive PCM data input.
This PCM input signal is shifted on the falling edge of BCLK and input from MSB.

BCLK

Shift clock input for the PCM data (PCMSO, PCMRI).
The frequency is set in the range of 64 kHz to 2048 kHz.

XSYNC

8 kHz synchronous signal input for Transmit PCM data.
This signal should be synchronized with BCLK. XSYNC is used for indicating MSB of the
transmit serial PCM.
Be sure to input the XSYNC signal because it is also used as the input of the timing circuit and
the clock source of the tone generator.

RSYNC

8 kHz synchronous signal input for Receive PCM data.
This signal should be synchronized with BCLK signal. RSYNC is used for indicating the MSB
of the receive serial PCM.

Figure 3 PCM Interface Basic Timing Diagram

BCLK

XSYNC

PCMSO

RSYNC

PCMRI

MSB

LSB

MSB

LSB

8kHz

(125

ms)

8/25

¡ Semiconductor

MSM7575

Voice Input
GSX2

VOXO

VOXI

Voice Output
VFRO

VXON

Presence
Detect

VXOFF

Absence
Detect (Hang-over time)

Normal Voice Signal
Decoded Time period

Background
Noise

(a) Transmit VOX Function Timing Diagram

(b) Receive VOX Function (CR6-B3: digital "0") Timing Diagram

(Presence)

(Absence)

(Presence)

Note: VOXO, VOXI function become valid when setting CR6-B7 to digital "1".

Figure 4 VOX Function

VOXO

Transmit VOX function signal output.
VOX function is to recognize the presence or absence of the transmit voice signal by detecting the
signal energy. "H" and "L" levels set to this pin correspond to the presence and the absence,
respectively. This result appears also at the register data CR7-B7. The signal energy detect
threshold is set by the control register data CR6-B6, B5.

VOXI

Signal input for receive VOX function.
The "H" level at VOXI indicates the presence of voice signal, the decoder block processes normal
receive signal, and the voice signal appears at analog output pins . The "L" level indicates the
absence of voice signal, the background noise generated in this device is transferred to the analog
output pins. The background noise amplitude is set by the control register CR6. Because this
signal is ORed with the register data CR6-B3, the control register data CR6-B3 should be set to
digital "0".

9/25

¡ Semiconductor

MSM7575

High Impedance

(a) Write Data Timing Diagram

(b) Read Data Timing Diagram

DEN

EXCK

DIN

DOUT

DEN

EXCK

DIN

DOUT

Figure 5 MCU Interface Input/Output Timing

Table-1

DEN , EXCK, DIN, DOUT

Serial control ports for MCU interface. Reading and writing data is performed by an external
MCU through these pins. Total 8 registers with 8 bits are provided on the devices.
DEN is the "Enable" control signal input, EXCK is the data shift clock input, DIN is the address
and data input, and DOUT is the data output from which inverted data of the contents of the
register is output.
Fig.5 shows the input or output timing diagram.

R/W : Enable to read/write R : Read only register.

Name

Address

Control and Detect Data

R/W

CR0

CR1

CR2

CR3

CR4

CR5

CR6

CR7

R/W

VOX

OUT

TX NOISE

LVL1

TX NOISE

LVL0

VOX

ON/OFF

LVL1

LVL0

OFF

TIME

VOX

RX NOISE

LEVEL SEL

RX NOISE

LVL1

RX NOISE

LVL0

SW7-

CONT

SW8-

CONT

SW9-

CONT

SW4-

CONT

SW5&

SW6-CONT

SW3-

CONT

SW2-

CONT

SW1-

CONT

TONE4

TONE3

TONE2

TONE1

TONE0

DTMF/

OTHERS

SEL

TONE

SEND

SAO/

VFRO

Side Tone

GAIN2

Side Tone

GAIN1

Side Tone

GAIN0

TONE

ON/OFF

TONE

GAIN3

TONE

GAIN2

TONE

GAIN1

TONE

GAIN0

ON/OFF

GAIN2

GAIN1

GAIN0

ON/OFF

GAIN2

GAIN1

GAIN0

RX PAD

TOUT2

-CONT

TOUT1

-CONT

TOUT3

-CONT

SEL

MCK

SEL

PDN

ALL

PDN

SAO/AOUT

LNR

10/25

¡ Semiconductor

MSM7575

ABSOLUTE MAXIMUM RATINGS

Parameter

Power Supply Voltage

Analog Input Voltage

Digital Input Voltage

Operating Temperature

Storage Temperature

Symbol

AIN

DIN

STG

Condition

Rating

0.3 to +5

0.3 to V

+ 0.3

0.3 to V

+ 0.3

30 to +85

55 to +150

Unit

°C

RECOMMENDED OPERATING CONDITIONS

Parameter

Power Supply Voltage

Operating Temperature Range

Input High Voltage

Input Low Voltage

Master Clock Frequency

Bit Clock Freqency

Synchronous Signal Frequncy

Clock Duty Ratio

Digital Input Rise Time

Digital Input Fall Time

Transmit Sync Signal Setting Time

Receive Sync Signal Setting Time

Synchronous Signal Width

PCM Set-up Time

PCM Hold Time

Digital Output Load

Bypass Capacitors for SG

Symbol

MCK1

BCK

SYNC

MCK2

Condition

MCK, XSYNC, RSYNC, PCMRI,

RINGC, BCLK, VOXI,
PDN/RESET, DEN, EXCK, DIN

MCK, XSYNC, RSYNC, PCMRI,

RINGC, BCLK, VOXI,
PDN/RESET, DEN, EXCK, DIN

BCLK

XSYNC, RSYNC

MCK, BCLK, EXCK

MCK, XSYNC, RSYNC, PCMRI,

RINGC, BCLK, VOXI,
PDN/RESET, DEN, EXCK, DIN

MCK, XSYNC, RSYNC, PCMRI,

RINGC, BCLK, VOXI,
PDN/RESET, DEN, EXCK, DIN

XSYNC, RSYNC

TOUT1, TOUT2, TOUT3,

PCMSO, VOXO, DOUT

SG to AG

MCK (CR0B6 = "0")

BCLK to XSYNC

BCLK to RSYNC

MCK (CR0B6 = "0")

XSYNC to BCLK

RSYNC to BCLK

PCMSO (Pull-up Resistor)

Min.

Typ.

Max.

Unit

+2.7

0.45

¥ V

0.01%

100

1 BCLK

100

500

10 + 0.1

0.01%

100

+25

9.600

8.0

19.200

+3.6

+70

0.16

¥ V

+0.01%

2048

100

+0.01%

100

°C

MHz

kHz

MHz

11/25

¡ Semiconductor

MSM7575

ELECTRICAL CHARACTERISTICS

DC and Digital Interface Characteristics

Parameter

Power Supply Current

Input High Voltage

Input Low Voltage

Output Low Voltage

Output Leakage Current

Input Capacitance

Symbol

DD1

DD2

Condition

Operating Mode, (V

= 3.0 V)

Power Down Mode, (V

= 3.0 V)

1 LSTTL, Pull-up: 500

PCMSO

Min.

0.45

¥V

0.0

Typ.

0.01

0.2

Max.

0.1

0.16

¥V

0.4

Unit

2.7 V to 3.6 V, Ta = 25°C to +70°C)

Output Resistance

OSG

Input Leakage Current

0 V

2.0

0.5

Output High Voltage

0.4 mA

0.5

¥ V

0.8

¥ V

Transmit Analog Interface Characteristics

Parameter

Input Resistance

Output Load Resistance

Output Load Capacitance

Output Amplitude

Input Offset Voltage

Symbol

INX

LGX

OGX

OFGX

Condition

AIN1+ , AIN1 , AIN2

Min.

Typ.

Max.

100

1.30 (*1)

Unit

GSX1, GSX2

GSX1, GSX2, R

= 20 k

PreOPAMPs

2.7 V to 3.6 V, Ta = 25°C to +70°C)

*1 7.7 dBm (600 W) = 0 dBm0, + 3.17 dBm0 = 1.30 V

(m-law Selected)

12/25

¡ Semiconductor

MSM7575

Receive Analog Interface Characteristics

*1 7.7 dBm (600 W) = 0 dBm0, + 3.17 dBm0 = 1.30 V

(m-law Selected)

Parameter

Input Resistance

Output Load Resistance

Output Load Capacitance

Symbol

INPW

LVF

LAO

LVF

LAO

Condition

PWI, AIN3+/, AIN4+/, REF1,

REF2, AVIN

Min.

1.2

Typ.

Max.

100

Unit

VFRO, SAO

Output Voltage Level

Offset Voltage

OVF

OAO

OFVF

OFAO

100

1.30 (*1)

100

VFRO, SAO

AOUT+, AOUT, GSX3, GSX4

VFRO, SAO

AOUT+, AOUT, GSX3, GSX4

AOUT+,
AOUT,
GSX3,
GSX4

VFRO, SAO

AOUT+, AOUT (Gain = 0 dB,

Power amp only) GSX3, GSX4

0.85

0.75

AVIN, REF1, REF2

= 20 k

= 350 k

+ 120 nF(See Fig.1)

= 1.2 k

2.7 V to 3.6 V, Ta = 25°C to +70°C)

1.30 (*1)

Comparator Input Voltage Range

100

400

IO1-IO2, IO3-IO4, IO5-IO6,

IO7-IO8, IO9-IO10, IO10-IO11,

IO12-V

, IO13-V

, IO14-V

Analog Switch "ON" Resistance

13/25

¡ Semiconductor

MSM7575

AC Chracteristics

Parameter

Transmit Frequency

Response

Symbol

OSS

Level

0 to 60

Min.

Typ.

Max.

Unit

Freq.

Others

OSS

T2 300 to 3000

0.15

0.20

OSS

1020

Reference

OSS

3300

0.15

0.80

OSS

3400

0.80

OSS

3968.75

Receive Frequency

Responce

0 to 3000

0.15

0.20

1020

Reference

3300

0.15

0.80

3400

0.80

3968.75

Transmit Signal

to Distortion Ratio

SD T1

SD T2

SD T3

SD T4

1020

SD T5

Receive Signal

to Distortion Ratio

SD R1

SD R2

SD R3

SD R4

1020

SD R5

Transmit Gain

Tracking

GT T1

0.2

GT T2

Reference

GT T3

1020

0.2

GT T4

0.5

GT T5

1.2

Receive Gain

Tracking

GT R1

0.2

GT R2

Reference

GT R3

1020

0.2

GT R4

0.5

GT R5

1.2

Condition

OSS

(*2)

IDLT

(75.7)

dBmOp

(dBmp)

IDLR

1020

0.285

0.320

(*4)

0.359

0.285

0.320

(*4)

0.359

(79.7)

Idle Channel Noise

AIN = SG

(*2)

(*3)

Vrms

GSX2

Absolute Signal

Amplitude

VFRO

(*2)

2.7 V to 3.6 V, Ta = 25°C to +70°C)

(dBm0)

(Hz)

14/25

¡ Semiconductor

MSM7575

AC Characteristics (Continued)

Digital Input/Output

Setting Time

SDX

200

*5(100)

XD1

200

XD2

200

1LSTTL + 100 pF

pull-up: 500

SRRT

Noise Freq.

: 0 to 50 kHz

Power Supply Noise

Rejection Ratio

Noise Level

: 50 mV

SRRR

XD3

200

Parameter

Symbol

Level

Min.

Typ.

Max.

Unit

2.7 V to 3.6 V, Ta = 25°C to +70°C)

Freq.

Others

Condition

See

Fig.4

100

M10

M11

Serial Port Digital

Input/Output Setting

Time

Load

= 100 pF

See

Fig.7

EXCK

MHz

EXCK

Shift Clock Frequency

(dBm0)

(Hz)

*5(100)

*2 Use the P-message weighted filter
*3 PCMRI input code

"11010101"(A-law)
"11111111"(m-law)

*4 0.320 Vrms = 0 dBm0 = 7.7 dBm
*5 Value in ( ) is for C

Load

= 10 pF Pull-up £ 20 kW

Note: All ADPCM coder and decoder characteristics comply with ITU-T Recommendation

G.721.

15/25

¡ Semiconductor

MSM7575

AC Characteristics (DTMF and Other Tones)

*6 Not contain the setting value of the programmable gain

dBm0

FT1

DTMF Tones

Frequency Difference

FT2

Parameter

Symbol

Min.

Typ.

Max.

Unit

2.7 V to 3.6 V, Ta = 25°C to +70°C)

Condition

dBm0

Other Tones

Transmit
Tones

dBm0

DTMF

, V

Original (reference)

Tone Signal Level

Relative Level of

DTMF Tones

DTMF (High)

and Other Tones

DTMF (Low)

DTMF (High)

and Other Tones

Receive
Tones

DTMF (Low)

AC Characteristics (Programmable Gain Stages)

All gain stages, to programmed value

Gain Accuracy

Parameter

Symbol

Min.

Typ.

Max.

Unit

2.7 V to 3.6 V, Ta = 25°C to +70°C)

Condition

AC Characteristics (VOX Function)

2.5

VXON

OFF

Æ ON

Transmit VOX Detect Time

(Voice signal ON/OFF detect time

) t

VXOF

Parameter

Symbol

Min.

Typ.

Max.

Unit

2.7 V to 3.6 V, Ta = 25°C to +70°C)

Condition

150/310 160/320 170/330

Æ OFF

To the setting of detect level

by CR6-B6, B5.

VOXO,

Fig.4

+2.5

Transmit VOX Detect Level

Accuracy

(Threshold Level)

18/25

¡ Semiconductor

MSM7575

FUNCTIONAL DESCRIPTION

Control Registers

(1) CR0 (Basic operating mode)

m SEL

Initial Value

CR0

MCK SEL

PDN ALL

PDN TX

PDN RX

LNR

PDN

SAO/AOUT

Note) "Initial": Reset state by PDN/RESET

B7 ...PCM Companding law select:

-law, 1/A-law

B6 ...Master clock frequency select:

0/9.600 MHz, 1/19.200 MHz

B5 ...Power down (whole system):

0/Power on, 1/Power down

When using this data for power down control, pin PDN/RESET should be set at
"H"level. The control registers are not reset by this signal.

B4 ...Power down (Transmit only):

0/Power on, 1/Power down

B3 ...Power down (Receive only including the op-amps of GSX3, GSX4 and comparator): 0/

Power on, 1/Power down

B2 ...Not used
B1 ...PCM interface linear code select:

0/Companding law selected by CR0-B7
1/14-bit Linear code (2's complement) in spite of the value of CR0-B7

B0 ...Power Down for Sounder output amps: (SAO), or Receiver output amp (AOUT, VFRO ):

When this data is set to digital "1", the circut which is not selected by CR4-B5 are at the
power down state.
When this data is set to digital "0", sounder amplifiers and receiver amplifiers are in the
power-on state.

20/25

¡ Semiconductor

MSM7575

This programmable gain table should be assigned, not only for transmit/receive voice signal, but
also for the transmitted DTMF and other tones. The transmission of these tone signals are
enabled, by the CR4-B6 data described later, The original (reference) signal amplitude of these
tones are analogically defined as follows.

DTMF low-group-tones .................................... 16 dBm0/Tone
DTMF high-group-tones and others............... 14 dBm0/Tone

For example, when selecting +8 dB (B6, B5, B4) = (1,1,1) as a transmit gain, each tone signal
amplitude with analogical expression on the pin PCMSO becomes as follows .

DTMF low-group tones .................................... 8 dBm0
DTMF high-group tones and other tones ...... 6 dBm0

Gain setting of side tone (path to receive side from transmit side) and receive side tone is
performed by register CR3.

(3)CR2 (PCM CODEC operational mode setting and transmit/receive gain adjustment)

B7 ... PCM Coder disable :

0/Enable, 1/Disable (transmit PCM idle pattern)

B6, B5, B4 ... Transmit gain adjustment, refer to Table-2.
B3 ... PCM Decoder disable :

0/Enable, 1/Disable (receive PCM idle pattern)

B2, B1, B0 ... Receive gain setting, refer to Table-2.

Table-2 Transmit/Receive Gain Setting table

TX ON/OFF

Initial Value

CR2

TX GAIN2 TX GAIN1 TX GAIN0 RX ON/OFF RX GAIN2 RX GAIN1 RX GAIN0

Transmit Gain

6 dB

4 dB

2 dB

0 dB

+2 dB

+4 dB

+6 dB

+8 dB

Receive Gain

6 dB

4 dB

2 dB

0 dB

+2 dB

+4 dB

+6 dB

+8 dB

21/25

¡ Semiconductor

MSM7575

(4) CR3 (Side tone and other tone generator gain setting)

The tone generator gain setting table for receive side, shown by Table-4, depends upon the
following reference level.

DTMF low-group tones ................................ 2 dBm0
DTMF high-group tones and others ............ 0 dBm0

For example, when selecting 6 dB (B3, B2, B1, B0) = (1, 1, 1, 1) as a tone generator gain, each DTMF
tone signal amplitude on SAO or VFRO is as follows.

DTMF low-group tone .................................. 8 dBm0
DTMF high-group tone or other tones ....... 6 dBm0

B7, B6, B5 ... Side tone path gain setting, refer to Table-3.
B4 ... Tone generator enable :

0/Disable, 1/Enable

B3, B2, B1, B0 ... Tone generator gain adjustment for receive side, refer to Table-4

Table-3 Side Tone Gain Setting Table

Side Tone Path Gain

OFF

21 dB

19 dB

17 dB

15 dB

13 dB

11 dB

9 dB

Table-4 Receive Tone Generator Gain Setting Table

Side. Tone

Initial Value

CR3

Side. Tone Side. Tone

TONE

GAIN0

GAIN2

GAIN1

GAIN0

ON/OFF

GAIN3

GAIN2

GAIN1

Tone Generator Gain

36 dB

34 dB

32 dB

30 dB

28 dB

26 dB

24 dB

22 dB

Tone Generator Gain

20 dB

18 dB

16 dB

14 dB

12 dB

10 dB

8 dB

6 dB

22/25

¡ Semiconductor

MSM7575

(5) CR4 (Tone genereator operating mode and frequency setting)

(b) B7 = 0 (Other tones)

Table-5-2 Tone Generator Frequency Setting

B7 ... DTMF or Other tones select : 0/Others, 1/DTMF
B6 ... Tone transmit enable (Transmit side) : 0/Voice signal (transmit), 1/Tone transmit
B5 ... Tone output pin select (Receive side) : 0/VFRO, 1/SAO
B4, B3, B2, B1, B0 ... Tone frequency setting, referred to Table-5-1, -2.

(a) B7 = 1 (DTMF tone)

Table-5-1

*Unrelated

DTMF/OTHERS

Initial Value

CR4

TONE

SAO/

TONE4

TONE3

TONE2

TONE1

TONE0

SEL

SEND

VFRO

Frequency

697 Hz + 1209 Hz

697 Hz + 1336 Hz

697 Hz + 1477 Hz

697 Hz + 1633 Hz

770 Hz + 1209 Hz

770 Hz + 1336 Hz

770 Hz + 1477 Hz

770 Hz + 1633 Hz

Frequency

852 Hz + 1209 Hz

852 Hz + 1336 Hz

852 Hz + 1477 Hz

852 Hz + 1633 Hz

941 Hz + 1209 Hz

941 Hz + 1336 Hz

941 Hz + 1477 Hz

941 Hz + 1633 Hz

Frequency

2 k/2.48 kHz, 8 Hz wamble

2 k/2.2 kHz, 8 Hz wamble

2 k/2.48 kHz, 4 Hz wamble

2 k/2.2 kHz, 4 Hz wamble

1 k/1.333 kHz, 8 Hz wamble

2.73 k/2.5 kHz, 8 Hz wamble

1.8 k/2 kHz, 8 Hz wamble

400 Hz,16 Hz wamble

Frequency

2000 Hz

2042 Hz

2514 Hz

500 Hz

667 Hz

1333 Hz

2100 Hz

400 Hz,20 Hz wamble

400 Hz

350 Hz + 440 Hz Mix

1.5kHz

1.8kHz

800 Hz

1000 Hz

1300 Hz

23/25

¡ Semiconductor

MSM7575

Wamble Tone Wave

4Hz wamble... Tf1 = Tf2 = 125 ms
8Hz wamble... Tf1 = Tf2 = 62.5 ms
16Hz wamble...Tf1 = Tf2 = 31.25 ms
20Hz wamble...Tf1 = Tf2 = 25 ms

(6) CR5 (Analog switch control)

B7 ... Control Analog switch SW7 between IO12 and V

0/SW7 OFF, 1/SW7 ON

B6 ... Control Analog switch SW8 between IO13 and V

0/SW8 OFF, 1/SW8 ON

B5 ... Control Analog switch SW9 between IO14 and V

0/SW9 OFF, 1/SW9 ON

B4 ... Control Analog switch SW5 between IO9 and IO10, and Analog switch SW6 between IO10

and IO11 :
0/SW5 OFF, SW6 ON, 1/SW5 ON, SW6 OFF

B3 ... Control Analog switch SW4 between IO7 and IO8 :

0/SW4 OFF, 1/SW4 ON

B2 ... Control Analog switch SW3 between IO5 and IO6 :

0/SW3 OFF, 1/SW3 ON

B1 ... Control Analog switch SW2 between IO3 and IO4 :

0/SW2 OFF, 1/SW2 ON

B0 ... Control Analog switch SW1 between IO1 and IO2 :

0/SW1 OFF, 1/SW1 ON

Tf1

Tf2

t
Repeatative waveform

SW7_

CONT

Initial Value

CR5

SW8_

CONT

SW9_

CONT

SW5&SW6_

CONT

SW4_

CONT

SW3_

CONT

SW2_

CONT

SW1_

CONT

24/25

¡ Semiconductor

MSM7575

(7) CR6 (VOX function control)

B7 ... VOX function enable :

0/Disable, 1/Enable

B6, B5 ... Transmit signal energy detect (Transmit VOX) threshold

(0, 0): 30 dBm0
(0, 1): 35 dBm0
(1, 0): 40 dBm0
(1, 1): 45 dBm0

B4 ... Hang-over time (Fig. 2, T

VXOFF)

0/160 ms, 1/320 ms

B3 ... Receive VOX function setting :

0/Background noise transmit, 1/Voice signal detect

When using this data for control, the pin VOXI should be set at a "L" level.

B2 ... Background noise amplitude setting :

0/Automatic, 1/Programmable by B1 and B0

Automatic : The noise is set at the voice signal amplitude at the time when B3
(or VOXI) changes from "1" to digital "0".

B1, B0 ... (0, 0):

No noise

(0, 1):

55 dBm0

(1, 0):

45 dBm0

(1, 1):

35 dBm0

(8) CR7 (Detect register, read only)

For IC test

B7 ... Transmit VOX function result :

0/Absence, 1/Presence

B6, B5 ... Transmit voiceless level (indicator) :

(0, 0) : below 60 dBm0

Note) These outputs are valid only when VOX

(0, 1) : 50 to 60 dBm0

function is enabled by CR6-B7.

(1, 0) : 40 to 50 dBm0
(1, 1) : over 40 dBm0

B4 ... Not used
B3 ... Not used
B2 ... Not used
B1 ... Not used
B0 ... Not used

VOX

ON/OFF

Initial Value

CR6

LVL1

LVL0

OFF

TIME

VOX IN

RX NOISE

LEVEL SEL

RX NOISE

LVL1

RX NOISE

LVL0

VOX

OUT

Initial

CR7

TX NOISE

LVL1

TX NOISE

LVL0

25/25

¡ Semiconductor

MSM7575

(Unit : mm)

PACKAGE DIMENSIONS

Notes for Mounting the Surface Mount Type Package

The SOP, QFP, TSOP, SOJ, QFJ (PLCC), SHP and BGA are surface mount type packages, which
are very susceptible to heat in reflow mounting and humidity absorbed in storage.
Therefore, before you perform reflow mounting, contact Oki's responsible sales person for the
product name, package name, pin number, package code and desired mounting conditions
(reflow method, temperature and times).

QFP64-P-1414-0.80-BK

Package material
Lead frame material
Pin treatment
Solder plate thickness
Package weight (g)

Epoxy resin
42 alloy
Solder plating
5

mm or more

0.87 TYP.

Mirror finish

NOTICE

The information contained herein can change without notice owing to product and/or
technical improvements. Before using the product, please make sure that the information
being referred to is up-to-date.

The outline of action and examples for application circuits described herein have been
chosen as an explanation for the standard action and performance of the product. When
planning to use the product, please ensure that the external conditions are reflected in the
actual circuit, assembly, and program designs.

When designing your product, please use our product below the specified maximum
ratings and within the specified operating ranges including, but not limited to, operating
voltage, power dissipation, and operating temperature.

Oki assumes no responsibility or liability whatsoever for any failure or unusual or
unexpected operation resulting from misuse, neglect, improper installation, repair, alteration
or accident, improper handling, or unusual physical or electrical stress including, but not
limited to, exposure to parameters beyond the specified maximum ratings or operation
outside the specified operating range.

Neither indemnity against nor license of a third party's industrial and intellectual property
right, etc. is granted by us in connection with the use of the product and/or the information
and drawings contained herein. No responsibility is assumed by us for any infringement
of a third party's right which may result from the use thereof.

The products listed in this document are intended for use in general electronics equipment
for commercial applications (e.g., office automation, communication equipment,
measurement equipment, consumer electronics, etc.). These products are not authorized
for use in any system or application that requires special or enhanced quality and reliability
characteristics nor in any system or application where the failure of such system or
application may result in the loss or damage of property, or death or injury to humans.
Such applications include, but are not limited to, traffic and automotive equipment, safety
devices, aerospace equipment, nuclear power control, medical equipment, and life-support
systems.

Certain products in this document may need government approval before they can be
exported to particular countries. The purchaser assumes the responsibility of determining
the legality of export of these products and will take appropriate and necessary steps at their
own expense for these.

No part of the contents contained herein may be reprinted or reproduced without our prior
permission.

MS-DOS is a registered trademark of Microsoft Corporation.

Printed in Japan

E2Y0002-29-62

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