MSM7540 Overview
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.
MSM7540 Key Features
- Single 5 V Power Supply Operation
- ADPCM Algorithm : plies pletely with 1988's version ITU-T G.721 (32 kbps)
- Transmit/Receive Full-Duplex Operation
- Transmit/Receive Synchronous Mode Only
- Serial ADPCM Transmission Data Rate : 32 kbps to 2048 kbps
- Serial PCM Transmission Data Rate : 64 kbps to 2048 kbps
- PCM Interface Coding Format MSM7540 : A-law or Linear (14-bit, 2's pliment) Selectable MSM7560 : m-law or Linear (14-bit
- Low Power Consumption Operating Mode : 60 mW Typ. Power-Down Mode : 1.0 mW Typ
- Two Analog Input Amplifier Stages : Externally Adjustable Gain
- Analog Output Stage : Push-pull Drive (direct drive of 350 W␣ + 120 nF)