ML2731

PRELIMINARY ML2731 PA Bias Controller GENERAL DESCRIPTION The ML2731 is a power amplifier (PA) bias controller with support circuits for a typical radio transceiver. The IC integrates a PA bias controller, a PA DC switch, a crystal oscillator circuit, a negative voltage generator and two voltage regulators. It can be used with GaAs FETs and silicon bipolar devices. Micro Linear’s ML2731, along with the ML2712 and the ML2713, form a complete transceiver solution for the 2.4 GHz IEEE802.11 communication standard, as well as other wireless ISM communication products. In addition to supporting Micro Linear’s transceiver chip set, the ML2731 can stand alone as: A compact bias voltage controller A compact negative voltage generator A compact crystal oscillator n Sets PA current and power output using a bias control n Integrates a PA DC supply switch n Prevents PA power-on if negative voltage is not present n Integrates all circuits needed for supporting a crystal n Incorporates a fast starting, high switching frequency, n Contains voltage regulators for an oscillator, a negative n Requires less than 1mA of current when powered down n Supply voltage ranges from 3.3V to 5.5V APPLICATIONS voltage generator and a 50mA 3.0V LDO output negative voltage generator requiring only small ceramic capacitors oscillator with 10MHz to 40MHz frequency range loop FEATURES n Cellular and Cordless Radios n WLAN Radios n Radios with GaAs FET Power Amplifiers n Fixed and Mobile radio transceivers SI...