Single Rail ADPCM
CODEC
Documents
Applications
Description
The
MSM7540L/7560L 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 from a
single 3 V power supply and provide low power consumption. The MSM7540L/7560L
are optimized for advanced digital cordless telephone system applications.
Block Diagram
Features
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Single 3 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
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MSM7540L : A-law or Linear (14 bit, 2's compliment) Selectable
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MSM7560L : µ-law or Linear (14 bit, 2's compliment) Selectable
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Low Power Consumption
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Operating Mode : 18 mW Typ. (VDD = 3.0 V)
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Power-Down Mode : 0.3 mW Typ. (VDD = 3.0 V)
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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:
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28-pin plastic SOP (SOP28-P-430-1.27-K)
(Product name:
MSM7540LGS-K)
(Product name: MSM7560LGS-K) |
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32-pin plastic TSOP (TSOPI32-P-814-0.50-1K)
(Product name:
MSM7560LTS-K) | |
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