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MX909ADW Datasheet

  • MX909ADW

  • GMSK Modem Data Pump

  • 38頁

  • CMLMICRO

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COMMUNICATION SEMICONDUCTORS
MX909A
GMSK Modem Data Pump
PRELIMINARY INFORMATION
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Flexible Operating Modes
Host
碌
C Interface
Low Power 3.3V/5.0V Operation
24-Pin Small Form Package Option
DATA BULLETIN
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GMSK Modulation
RX or TX up to 19.2k bits/sec
Full Data Packet Framing
Mobitex樓 Compatible
樓
RADIO
MODULATOR
RF
DISCRIMINATOR
ANALOG RX
ANALOG TX
MX909A
MODEM
DATA
PUMP
DATA AND
CONTROL BUS
HOST
碌
C
SYSTEM
APPLICATION
PROCESSING
The MX909A is a low power CMOS device containing all of the baseband signal processing and Medium
Access Control (MAC) protocol functions required for a high performance GMSK Wireless Packet Data
Modem. The MX909A interfaces with a host
碌C
and radio modulation/demodulation circuits to deliver reliable
two-way transfer of application data over a wireless link.
The MX909A assembles application data received from the host
碌C,
adds forward error correction (FEC), and
error detection (CRC) codes, time-spreads this data by interleaving (burst-error protection) and scrambles
(randomizes) the bit pattern. After automatically adding bit and frame sync codewords, the data packet is
converted into analog GMSK signals for modulating into the radio transmitter.
In the receive mode, the MX909A performs the reverse function using the analog signals from the receivers
discriminator. After error correction and removal of the packet overhead, the recovered application data is
supplied to the host
碌C.
Any CRC detected residual uncorrected errors in the data will be flagged. Readout
of the SNR value during receipt of a packet is also provided.
The MX909A uses data block sizes and FEC/CRC algorithms compatible with the Mobitex樓 Wide Area
Network over-air standard. The format used is suitable for other private applications where the high-speed
transfer of data over narrow-band wireless links is required. The MX909A is programmable to operate at
standard bit-rates from a wide choice of XTAL/CLOCK frequencies.
The MX909A may be used with a 3.0V to 5.5V power supply and is available in the following packages:
24-pin SSOP (MX909ADS), 24-pin SOIC (MX909ADW), 24-pin PLCC (MX909ALH), and
24-pin PDIP (MX909AP).
隴
2001 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480134.005
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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