Description

The CD22354A and CD22357A are monolithic silicongate, double-poly CMOS integrated circuits containing the band-limiting filters and the companding A/D and D/A conversion circuits that conform to the AT&T D3/D4 specifications and CCITT recommendations. The CD22354A provides the AT&T µ-law and the CD22357A provides the CCITT A-law companding characteristic.

Features

• Meets or Exceeds All AT&T D3/D4 Specifications and CCITT Recommendations

• Complete CODEC and Filtering Systems: No External Components for Sample-and-Hold and Auto-Zero Functions. Receive Output Filter with (SIN X)/X Correction and Additional 8kHz Suppression

• Variable Data Clocks - From 64kHz . . . . . . . . . . . . . . . . . . . . . 2.1MHz

• Receiver Includes Power-Up Click Filter

• TTL or CMOS-Compatible Logic

• ESD Protection on All Inputs and Outputs

Applications

• PABX

• Central Office Switching Systems

• Accurate A/D and D/A Conversions

• Digital Telephones

• Cellular Telephone Switching Systems

• Voice Scramblers - Descramblers

• T1 Conference Bridges

• Voice Storage and Retrieval Systems

• Sound Based Security Systems

• Computerized Voice Analysis

• Mobile Radio Telephone Systems

• Microwave Telephone Networks

• Fiber-Optic Telephone Networks