Serial Register Interface ADPCM CODEC for
Telephone Recording
Documents
This is an obsolete product. The
document is for reference only. 
Description
The
MSM7708-02 is a CMOS IC developed for applying PHS (Personal Handyphone System).
This device provides a CODEC function which performs transcoding between the
voice band analog signal and 32 kbps ADPCM data. It also provides a serial
register interface function for telephone call recording.
Provided with such functions as DTMF tone and several kinds of tone
generation, transmit/receive data mute and gain control, side-tone pass, and
voice/silence detection, the MSM7708-02 is best suited for PHS handsets.
Features
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Single 3V power supply operation (VDD:2.7 V to 3.6
V) |
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Low power consumption
When system is operating: 6mA
typ.
When powered down: 0.02 mA typ. |
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ADPCM CODEC
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ADPCM: ITU-T Recommendations G.721 (32kbps) |
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Transmit/receive full duplex capability |
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PCM interface code format: µ-law or A-law selectable
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Serial ADPCM and PCM transmission rate: 64 kbps to 2,048 kbps
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Transmit/receive mute function; transmit/receive programmable
gain setting |
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Side tone generator (8-step level adjustment) |
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Built-in DTMF tone, ringing tone, and various tone generators
|
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Built-in VOX function | |
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Serial Register Interface
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Interface for a serial register: 1Mb (MSM63V89C), 4 Mb
(MSM6684), 8Mb (MSM6685) |
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Interface for a serial voice ROM: 1 Mb (MSM6595A), 2 Mb
(MSM6596A), 3 Mb (MSM6597A) |
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Maximum recording time: 32 s ( 1Mb), 128 s (4 Mb), 256 s (8
Mb) |
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Maximum recording channels: 32 ch |
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Playback data transmit/receive selectable |
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Package:
64-pin plastic TQFP (TQFP64-P-1010-0.50-K)
(Product name:MSM7708-02TS-K)
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