821004J Description
The 821004J is a single-chip, four channel PCM CODEC with on-chip filters. The device provides analog-to-digital and digital-to-analog conversions and supports both a-law and µ−law panding. The digital filters in 821004J provides the necessary transmit and receive filtering for voice telephone circuit to interface with time-division multiplexed systems.
821004J Key Features
- 4 channel CODEC with on-chip digital filters
- Selectable A-law or µ-law panding
- Master clock frequency selection: 2.048 MHz, 4.096 MHz or
- Internal timing automatically adjusted based on MCLK and frame sync signal
- Separate PCM and master clocks
- Single PCM port with up to 8.192 MHz data rate (128 time slots)
- Transhybrid balance impedance hardware adjustable via external ponents
- Transmit gains hardware adjustable via external ponents
- Low power +5.0 V CMOS technology
- +5.0 V single power supply