Overview

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.

  • 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

Applications

  • PBX systems
  • Central office switches
  • Digital telephones
  • Integrated voice/data access units

Documentation

Design & Development

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.

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Product Options

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    821034DNG
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    		PQFP 52 Yes Tray 3 9.841 Get Samples,
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