Overview
Description
The 821034 is a single-chip, four-channel PCM codec with on-chip filters and a programmable gain setting. This device provides both µ-Law and A-Law companding digital-to-analog and analog-to-digital conversions based on ITU-T G.711 - G.714 specifications. The digital filters in the 821034 provide the necessary transmit and receive filtering for voice telephone circuits to interface with time-division multiplexed systems. The 821034 has a flexible PCM interface with software-selectable timing modes and an independently programmable time slot for each transmit and receive channel. It also integrates the SLIC signaling functions through internal registers. The Codec and SLIC control/status registers are accessed via the serial control interface.
Features
- 4-channel codec with on-chip digital filters
- Software selectable A-law/μ-law companding
- Programmable gain setting
- Automatic master clock frequency selection: 2.048MHz, 4.096MHz, or 8.192MHz
- Flexible PCM interface with up to 128 programmable time slots, data rate from 512kbits/s to 8.192Mbits/s
- 5 SLIC signaling pins per channel
- Flexible serial control interface to microcontroller
- Software programmable timing modes
- TTL and CMOS compatible digital I/O
- Meets or exceeds ITU-T G.711 - G.714 requirements
- +5V single power supply
- Low power consumption: 100mW Typ.
- Operating temperature range: -40 °C to +85 °C
- 52-pin PQFP package
Comparison
Applications
Applications
- PBX systems
- Central office switches
- Digital telephones
- Integrated voice/data access units
Design & Development
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.