描述 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.

特性 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