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MX919BP

4-Level FSK Modem Data Pump

MX-COM Inc  

COMMUNICATION SEMICONDUCTORS

DATA BULLETIN

MX919B

4-Level FSK Modem Data Pump

PRELIMINARY INFORMATION

Features

• 4-Level Root Raised Cosine FSK Modulation

• Half Duplex, 4800 to 19.2kbps

• Increase Channel Bit Rate/Hz

• Full Data Packet Framing

• Impulse and NRZ Signal Modes

• Enhanced Performance in Noisy Conditions

• Error Detection and Error Correction

• Low Power 3.3V/5.0V Operation

Applications

• Wireless Data Terminals

• Two Way Paging Systems

• Digital Radio Systems

• Wide Area Wireless Data Broadcasts

• Point to Point Wireless Data Links

RADIO

MODULATOR

RF

DISCRIMINATOR

ANALOG TX

ANALOG RX

MX919B

MODEM

DATA

PUMP

DATA AND

CONTROL BUS

HOST µC

SYSTEM

APPLICATION

PROCESSING

The MX919B is a low voltage CMOS device containing 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 µC and the radio modulation/demodulation circuits to deliver

reliable two-way transfer of the application data over a wireless link.

The MX919B assembles application data received from the host µC, adds forward error correction (FEC) and

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

adding symbol and frame sync codewords, the data packet is converted into filtered 4-level analog signals for

modulating the radio transmitter.

In receive mode, the MX919B performs the reverse function using the analog signals from the receiver

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

supplied to the host µC. CRC detected residual uncorrected data errors will be flagged. A readout of the

SNR value during receipt of a packet is also provided.

The MX919B uses data block sizes and FEC/CRC suitable for applications where high-speed transfer of data

over narrow-band wireless links is required. The device is programmable to operate at standard bit rates from

a wide range of Xtal/clock frequencies.

The MX919B may be used with a 3.0V to 5.5V power supply and is available in the following package styles:

24-pin SSOP (MX919BDS), 24-pin SOIC (MX919BDW), 24-pin PLCC (MX919BLH), and 24-pin PDIP

(MX919BP).

©2001 MX•COM, INC.

www.mxcom.com Tele: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480170.003

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

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