Datasheet > FX919B

FX919B

更新时间： 2024-10-29 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
47页	1318K
描述
CML Semiconductor Products 4-Level FSK Modem Data Pump

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FX919B 数据手册

CML Semiconductor Products

4-Level FSK Modem Data Pump FX919B

D/919B/1 July 1997

Advance Information

Features

Applications

4-Level FSK Data Modulation

Wireless Data Terminals

Half Duplex, 4800 to 19.2k bits/sec

Excellent Radio Fading Performance

Error Detection and Error Correction

Low Power 3.3V to 5V Operation

Two Way Paging Systems

Digital Radio Systems

Wide Area Wireless Data Broadcasts

Point to Point Wireless Data Links

1.1

Brief Description

The FX919B 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 FX919B is backwards compatible

with the FX919A but offers better performance during radio link fading and selectable Tx symbol shapes.

The FX919B 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 FX919B 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 FX919B uses data block sizes and FEC/CRC algorithms suitable for applications which require the high-

speed transfer of data over narrow-band wireless links. 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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