Datasheet > FX929B

FX929B

更新时间： 2024-10-31 22:32:15

品牌	Logo	应用领域
CMLMICRO		调制解调器半导体泵
页数	文件大小	规格书
48页	1080K
描述
CML Semiconductor Products 4-Level FSK Modem Data Pump

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FX929B 数据手册

CML Semiconductor Products

4-Level FSK Modem Data Pump FX929B

Advance Information

D/929B/1 May 1997

Features

Applications

4800 to 19200 b/s Operation

RCR STD-47 and RD-LAP* Systems

Two-Way Paging Equipment

Mobile Data Systems

Full Packet Data Framing

4-Level FSK Data Modulation

Low Power, 2.5mA at 3.3V

Flexible Operating Modes

Powersave Option

Wireless Telemetry

DataTAC^ÒTerminals

Portable Wireless Data Equipment

*Radio Data-Link Access Procedure (RD-LAP) is a data communications air interface protocol developed by Motorola Inc.

1.1

Brief Description

The FX929B is a CMOS integrated circuit that contains all of the baseband signal processing and Medium

Access Control (MAC) protocol functions required for a high performance 4-level FSK Wireless Packet Data

Modem. It interfaces with the modem host processor and the radio modulation/demodulation circuits to deliver

reliable two-way transfer of the application data over the wireless link. The FX929B is backwards compatible

with the FX929A but offers better performance during radio link fading and selectable Tx symbol shapes.

The FX929B assembles application data received from the processor, adds forward error correction (FEC) and

error detection (CRC) information and interleaves the result for burst-error protection. After adding symbol and

frame synchronisation codewords, it converts the packet into a filtered 4-level analogue baseband signal for

modulating the radio transmitter.

In receive mode, the FX929B performs the reverse function using the analogue baseband signals from the

receiver discriminator. After error correction and removal of the packet overhead, the recovered application

data is supplied to the processor. Any residual uncorrected errors in the data will be flagged. A readout of the

SNR value during receipt of a packet is also provided.

The FX929B uses data block sizes and FEC/CRC algorithms compatible with the RD-LAP and RCR STD-47

over-air standards. The device is programmable to operate at most standard bit-rates from a wide choice of

Xtal/clock frequencies.

ã 1997 Consumer Microcircuits Limited

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