Single Rail ADPCM CODEC
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Applications
Description
The
MSM7540/7560 are single channel ADPCM CODEC ICs which perform mutual transcoding
between an analog voice band signal 300 to 3400 Hz and 32 kbps ADPCM serial
data. Using advanced circuit technology, these devices operate using a single 5
V power supply and have low power consumption. The MSM7540/7560 are optimized
for advanced digital cordless telephone system applications.
Block Diagram
Features
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Single 5 V Power Supply Operation |
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ADPCM Algorithm :
Complies completely with 1988's version
ITU-T G.721 (32 kbps) |
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Transmit/Receive Full-Duplex Operation |
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Transmit/Receive Synchronous Mode Only |
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Serial ADPCM Transmission Data Rate : 32 kbps to 2048 kbps
|
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Serial PCM Transmission Data Rate : 64 kbps to 2048 kbps
|
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PCM Interface Coding Format
MSM7540 : A-law or Linear
(14-bit, 2's compliment) Selectable
MSM7560 : µ-law or Linear (14-bit, 2's
compliment) Selectable |
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Low Power Consumption
Operating Mode : 60 mW
Typ.
Power-Down Mode : 1.0 mW Typ. |
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Two Analog Input Amplifier Stages : Externally Adjustable Gain
|
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Analog Output Stage : Push-pull Drive (direct drive of 350
 + 120 nF) |
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Built-in Crystal Oscillator (10.368 MHz) |
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Built-in Reference Voltage Supply |
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Option Reset Specified by ITU-T G. 721/ADPCM |
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Package:
28-pin plastic SOP
(SOP28-P-430-1.27-K)
(Product name: MSM7540GS-K)
(Product name:
MSM7560GS-K) |
