MX919B

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 C 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 C, 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 C.  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).