器件名称: CMX823
功能描述: Programmable Paging Tone Decoder
文件大小: 323.86KB 共22页
简 介:CML Microcircuits
COMMUNICATION SEMICONDUCTORS
D/823/3 November 2003
CMX823
Programmable Paging Tone Decoder
Provisional Issue
Features
Decodes 32 User-Programmed Tones Stores Two Lists of 32 Tones to FastSwitch Between Tone Sets Configurable Decode Response Time and Decode Bandwidths Low Power: 0.75mA at 2.7V (typ.) and 'Zero-Power' Powersave Mode Superior Signal to Noise Performance Low Cost 3.58MHz Xtal/Clock Small 16-pin TSSOP Package
Applications
Two-Tone and 5/6-Tone Pagers Selective Calling (SELCALL) Systems Voice Pager Switching and Signalling Revertive Paging Systems Wireless Local Loop Signalling Audio Tone Signalling Applications
1.1
Brief Description
The CMX823 is a high performance, low power, audio tone decoder that can operate on low S/N signals. Each decoded tone frequency is user-defined to provide the flexibility to operate in a variety of paging, two-way radio and proprietary systems. Example systems and tones include: Motorola Quick Call series; GE groups A, B and Zetron, Reach and Plectron 2-tone radio paging; Motorola 5/6-tone paging; and the EIA, CCIR, ZVEI1 and EEA tonesets used for HSC radio paging and SELCALL. Up to 32 user-defined decode tone frequencies from 280Hz to 3500Hz are written to an internal RAM-based FIFO. (Two separate 32-tone FIFOs are provided and support fast switching between tone sets.) Each programmed tone (entry in the list) is user-assigned to one of two (or both) tone groups. 2-tone sequence decoding is simpli……