LMX3162

The LMX3162 Single Chip Radio Transceiver is a monolithic,integrated radio transceiver optimized for use in ISM 2.45GHz wireless systems. It is fabricated using National's ABiCV BiCMOS process (fT = 18 GHz).

The LMX3162 contains phase locked loop (PLL), transmitand receive functions. The 1.3 GHz PLL is shared betweentransmit and receive sections. The transmitter includes a fre-quency doubler, and a high frequency buffer. The receiverconsists of a 2.5 GHz low noise mixer, an intermediate fre-quency (IF) amplifier, a high gain limiting amplifier, a fre-quency discriminator, a received signal strength indicator(RSSI), and an analog DC compensation loop. The PLL,doubler, and buffers can be used to implement open loopmodulation along with an external VCO and loop filter. Thecircuit features on-chip voltage regulation to allow supplyvoltages ranging from 3.0V to 5.5V. Two additional voltageregulators provide a stable supply source to external dis-crete stages in the Tx and Rx chains.

The IF amplifier, high gain limiting amplifier, and discrimina-tor are optimized for 110 MHz operation, with a total IF gainof 85 dB. The single conversion receiver architecture pro-vides a low cost, high performance solution for communica-tions systems. The RSSI output may be used for channelquality monitoring.

The Single Chip Radio Transceiver is available in a 48-pin7mm X 7mm X 1.4mm PQFP surface mount plastic pack-age.