OKI MSM7570L-01TS-K, MSM7570L-02TS-K Datasheet

E2U0028-28-82

¡ Semiconductor

This version: Aug. 1998

Previous version: Nov. 1996

MSM7570L-01/02

Multi-Function ADPCM CODEC

GENERAL DESCRIPTION

The MSM7570L-01/02, developed for advanced digital cordless telephone systems, are single channel ADPCM CODEC ICs which perform mutual transcoding between the analog voice band signal and 32 kbps ADPCM serial data. The devices include DTMF Tone and several types of tone generation, transmit/receive data mute and gain control, side-tone path and gain control, and VOX function. Using advanced circuit technology, these devices operate from a single 3 V power supply and provide low power consumption.

Note: The MSM7570L–01differs from MSM7570L–02 in Ringing Tone Frequency.

FEATURES

••

• Single 3 V Power Supply Operation VDD: 2.7 V to ␣ 3.6 V

••

• ADPCM Algorithm : ITU-T G.726 (32 kbps, 24 kbps, 16 kbps)

••

• Full-Duplex Transmit/Receive Operation

••

• Transmit/Receive Synchronous Mode Only

••

• PCM Data Format : A-law/µ-law Selectable

••

• Serial PCM/ADPCM Transmission Data Rate :64 kbps to 2048 kbps

••

• Low Power Consumption

•• Operating Mode : 21 mW Typ. (V Power-Down Mode : 0.3 mW Typ. (V

••

• Two Analog Input Amplifier Stages : Externally Adjustable Gain

••

• Analog Output Stage : Push-pull Drive (direct drive of 350 W␣ + 120 nF)

••

• Master Clock Frequency : 12.288/19.200 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/Function Tones Generator

••

• Built-in Various Ring Back Tone Generator

••

• Serial MCU Interface Control

••

• Built-in Sounder Driving Amplifier

••

• Built-in VOX Control

•• Transmit side : Voice Signal Detect Receive side : Background Noise Generation

••

• Characteristic Evaluation Board.

••

• Package:

••

32-pin plastic TSOP (TSOPI32-P-814-0.50-1K) (Product name: MSM7570L-01TS-K)

(Product name: MSM7570L-02TS-K)

= 3.0 V)

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MSM7570L-01/02

BLOCK DIAGRAM

–1

VOXO

XSYNC IS

PCMSI

PCMSO

BCLK

PCMRI

PCMRO

RSYNC

VOXI

ADPCM CODER

TXMUTE

RXON/OFF

RXPAD

Ex-

pan-

der

Receive gain adjust

LPF

D/A

Conv.

Filter

Clock/Timing

MCU Interface

REF

Voice

Detect

Compan-

der

Transmit gain adjust

Tone gain adjust

BPF

TXON/OFF

A/D

Conv.

Filter

DTMF/other

Tone Generator

Noise Generator

Side tone gain adjust

AIN1–

AIN1+

GSX1

AIN2

GSX2

AOUT+

AOUT–

PWI

VFRO

SAO+

SAO–

VDDC

DGC

AGC

DEN

EXCK

DIN

DOUT

MCK

PDN/

RESET

RXMUTE

ADPCM

DECODER

Power Detect

–

¡ Semiconductor

PIN CONFIGURATION (TOP VIEW)

AIN2

PWI

VOXI

3 4 5 6 7 8

9 10 11 12 13 14 15 16

AIN1+ AIN1–

GSX1

GSX2 VFRO

AOUT– AOUT+

SAO+ SAO–

PDN/RESET

MSM7570L-01/02

32 31

BCLK

XSYNC

RSYNC

PCMSO

PCMSI IS

26 25

IR PCMRO

24 23

PCMRI

MCK

DEN EXCK

20 19

DIN DOUT

VOXO

32-Pin Plastic TSOP

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MSM7570L-01/02

PIN AND FUNCTIONAL DESCRIPTIONS

AIN1+, AIN1–, AIN2, GSX1, GSX2

Transmits analog input and the output for transmit gain adjustment. AIN1– (AIN2) connects to the inverting input of the internal transmit amplifier. AIN1+ connects to the non-inverting input of the internal transmit amplifier. GSX1 (GSX2) connects to the internal transmit amplifier output. Refer to Fig.1 for gain adjustment.

VFRO, AOUT+, AOUT–, PWI

Receives analog output and the output for receive gain adjustment. VFRO is the receive filter output. AOUT+ and AOUT– are differential analog signal outputs which can directly drive ZL = 350 W + 120 nF or a 1.2 kW load. Refer to Fig.1 for gain adjustment.

Differential

Analog Input

0.1 mF

10 mF

–

Transmit Gain: V = (R2/R1) ¥ (R4/R3)

Receive Gain: Vo/V = 2 ¥ (R6/R5)

= 120 nF

+ 350 W

C1 R1

GSX2

FRO

/Vi

Differential Analog Output

AIN1–

AIN1+

GSX1

SG AIN2

GSX2

VFRO

PWI

AOUT–

AOUT+

–

–1

to ENCODER

–

REF

from DECODER

SELECT

= 120 nF

+ 350 W

SAO+

Differential Sound Output

SAO–

–1

Figure 1 Analog Input/Output Interface

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MSM7570L-01/02

SAO+, SAO–

Differential analog outputs for sound output. Control register data CR4-B5 determines the output pins (AOUT+ and AOUT- /SAO+ and SAO) for the voice signal and an acoustic component of the sound tone, DTMF tone, R tone, F tone, and various types of tones at either the VFRO pin or the SAO+ and SAO- pins. The output load conditions of these pins are the same as those of AOUT+ and AOUT-.

Analog signal ground. The output voltage of this pin is approximately 1.4 V. Put the bypass capacitors (10 µF in parallel with 0.1 µF ceramic type) between this pin and AG to get the specified noise characteristics. During power-down, this output voltage is 0 V. The SG voltage if necessary should be used via a beffer.

Analog ground.

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

+3 V power supply.

PDN/RESET

Power down and reset control input. A “0” level makes the IC enter a power down state. At the same time, all control register data are reset to the initial state. Set this pin to “1” during normal operating mode. The power down state is controlled by a logical OR with CR0-B5 of the control register. When using PDN/RESET for power down and reset control, set CR0-B5 to digital “0”. The reset width (during “L”) should be 200ns or more.

MCK

Master clock input. The frequency must be 12.288 MHz or 19.2 MHz. The applied clock frequency is selected by the control register data CR0-B6. The master clock signal may be asynchronous with BCLK, XSYNC, and RSYNC.

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MSM7570L-01/02

PCMSO

Transmit PCM data output. PCM is output from MSB in synchronization with the rising edge of BCLK and XSYNC.

PCMSI

Transmit PCM data input. This signal is converted to the transmit ADPCM data. PCM is shifted in synchronization with the falling edge of BCLK. Normally, this pin is connected to PCMSO.

PCMRO

Receive PCM data output. PCM is the output signal after ADPCM decoder processing. This signal is output serially from MSB in synchronization with the rising edge of BCLK and RSYNC.

PCMRI

Receive PCM data input. PCM is shifted on the rising edge of the BCLK and input from MSB. Normally, this pin is connected to PCMRO.

Transmit ADPCM signal output. After having encoded PCM with ADPCM, this signal is output from MSB in synchronization with the rising edge of BCLK and XSYNC. This pin is an open drain output and remains in a high impedence state during power-down. IS requires a pull-up resistor.

Receive ADPCM signal input. This input signal is shifted serially on the falling edge of BCLK in synchronization with RSYNC, and input from MSB.

BCLK

Shift clock input for the PCM data (PCMSO, PCMSI, PCMRO, PCMRI) and the ADPCM data(IS, IR) . The frequency is set in the 64 kHz to 2048 kHz range.

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MSM7570L-01/02

XSYNC

Transmit PCM and ADPCM data 8 kHz synchronous signal input. Synchronize this signal with BCLK signal. XSYNC is used to indicate the MSB of the transmit serial PCM and ADPCM data stream. Be sure to input the XSYNC signal because it is also used as the input of the timing generator.

RSYNC

Receive PCM and ADPCM data synchronous signal input. Synchronize this signal with BCLK signal. RSYNC is used to indicate the MSB of the receive serial PCM and ADPCM data stream.

VOXO

Transmit VOX function signal output. VOX function voice recognizes the presence or absence of the transmit voice signal by detecting the signal energy. “1” and “0” levels set on this pin correspond to the presence and the absence of voice, respectively. This result appears 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. A “1” level at VOXI indicates the presence of a voice signal. The decoder block processes normal receive signal, and the voice signal appears at the analog output pins . The “0” level indicates the absence of a voice signal. 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, set the control register data CR6-B3 to digital “0”.

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Voice Input GSX2

MSM7570L-01/02

Silence

VOXO

VOXI

Voice Output VFRO

VXON

Voice Detect

Voice

VXOFF

Silence Detect (Hang-over time)

Voice

(a) Transmit VOX Function Timing Diagram

Silence

Voice

Normal Voice Signal Decoded Time period

Background Noise

Voice

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

Note: VOXO, VOXI functions becomes valid when setting CR6-B7 to digital “1”.

Figure 2 VOX Function

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