CML調制解調器 CMX589AE2

CML調制解調器 CMX589AE2屬性

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CML調制解調器 CMX589AE2描述

CMX589A：Versatile Full-duplex GMSK Modem

The CMX589A is a single-chip full-duplex synchronous data pump/modem designed for Wireless Data Applications. Employing Gaussian filtering for Minimum Shift Keying (GMSK) baseband modulation applications, the CMX589A features a wide range of available data rates from 4000 to 200000 (200k) b/s.

Data Rates and the choice of BT (0.3 or 0.5) are pin programmable to provide for different system requirements.
The Tx and Rx digital data interfaces are bit serial, synchronized to generated Tx and Rx data clocks. Separate Tx and Rx Powersave inputs allow full or half-duplex operation. Rx input levels can be set by suitable AC and DC level adjusting circuitry built with external components around an on-chip Rx Input Amplifier. Acquisition, Lock, and Hold of Rx data signals are made easier and faster by the use of Rx Control Inputs to clamp, detect, and/or hold input data levels and can be set by the μProcessor as required.

The Rx S/N output provides an indication of the quality of the received signal.

Features:
Full Duplex (GMSK)
Data Rates: 4kbps to 200kbps
Selectable BT: 0.3 or 0.5
Simple Control: No μP Required

Applications:
Meets RCR STD-18
Wireless LAN/Modems
Rx Only AIS Monitors
Automatic Vehicle Location Links
Wireless Data Links for PCs, Laptops and Printers
Point-Of-Sale Terminals
Wireless Bar-Code Readers and Stock Controllers
Wireless Local Loop
Amateur Packet Radio
Wireless ISDN

Supply Requirement:
3.0 to 5.5 V

CML公司生產的CMX589A專用集成芯片，具有較寬的基帶信號接收速率。在本設計中，為CMX589A提供兩種頻率的外部晶振，分別為25．576 MHz和8．192 MHz，通過跳線控制。CMX589A的控制引腳與單片機的P2口相連來控制濾波器的參數，其中ClkDivA、ClkDivB與外部時鐘配合共同決定高斯濾波器的基帶碼元速率，設置如表1所示。BT引腳控制高斯濾波器的系統帶寬，當設置為“l”時，系統BT值為O．5；當設置為“O”時，BT值為O．3。高斯濾波器的工作過程為：首先根據不同系統的需要來設置濾波器的基帶碼元速率和帶寬BT值，然后在Tx Data引腳接入需要調制的基帶碼元信號，同時給Tx Enable置高電平，通過TxOut就可以接收到高斯濾波基帶信號。

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