MSM7731-02 OKI [OKI electronic componets], MSM7731-02 Datasheet
MSM7731-02
Manufacturer Part Number
MSM7731-02
Description
Dual Echo Canceler & Noise Canceler with Dual Codec for Hands-Free
Manufacturer
OKI [OKI electronic componets]
Datasheet
1.MSM7731-02.pdf
(53 pages)
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GENERAL DESCRIPTION
The MSM7731 is an IC device developed for portable, handsfree communication with built-in line echo canceler,
acoustic echo canceler, and transmission signal noise canceler. Built-in to the voice signal interface is a linear
CODEC for the analog interface on the acoustic-side, and a linear CODEC for the analog interface on the line-side.
On the line-side, in addition to the analog interface, there is also a -law PCM/16-bit linear digital interface.
Equipped with gain and mute controls for data transmission and reception, a -law PCM/16-bit linear digital
interface for memo recording and message output, and transfer clock and sync clock generators for digital
communication, this device is ideally suited for a handsfree system.
FEATURES
• Single 3 V Power Supply Operation (2.7 to 3.6 V)
• Built-in 2-channel (line and acoustic) echo canceler
• Built-in transmission signal noise canceler
• Built-in 2-channel CODEC
• Built-in analog input gain amp stage (max. gain = 30 dB)
• Analog output configuration : Push-pull drive (can drive a 1.2 k
• Built-in transmit slope filter
• Digital interface coding formats
• Digital interface sync formats
• Built-in digital transmission clock generators
• Digital transmission rate
• Fixed digital interface sync clock (SYNC) enables automatic power-down
• Master clock frequency
• Low power consumption
• Control by both the serial microcomputer interface and parallel port is possible
• Transmit/receive mute function, transmit/receive programmable gain setting
• Package
FEDL7731-02-04
1 Semiconductor
MSM7731-02
Dual Echo Canceler & Noise Canceler with Dual Codec for Hands-Free
Echo attenuation
Cancelable echo delay time :
Noise attenuation
Synchronous transmission and reception enables full duplex operation
Sync clock (SYNC)
Transmission clock (BCLK)
External input
Internal generation
Compatible with crystal oscillator and crystal
Operating mode
Power down operation
Line echo canceler + acoustic echo canceler
Acoustic echo canceler only
: 64-pin plastic QFP (QFP64-P-1414-0.80-BK)(Product name: MSM7731-02GA)
: 35 dB (typ.) for white noise
: 17 dB (typ.) for white noise
: 64 to 2048 kbps
: 64 kbps (µ-law PCM)/128 kbps (16-bit linear)
: 19.2 MHz
: typ. 35 mA (when V
: typ. 0.02 mA (when V
40 dB (typ.) for single tone
: µ-law PCM, 16-bit linear (2's complement)
: Normal-sync, short-frame-sync
: 8 kHz output
: 64 kHz output (µ-law PCM)/128 kHz output (16-bit linear)
DD
DD
= 3.0 V in a silent mode)
= 3.0 V in a silent mode)
: Tlined = 27 ms (max.)
: Tacoud = 59 ms (max.)
Tacoud = 59 ms – Tlined (max.)
load
)
This version: Jan. 2000
Previous version: Jan. 2000
1/53
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