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.

FEATURES

■ Sets PA current and power output using a bias control loop

■ Integrates a PA DC supply switch

■ Prevents PA power-on if negative voltage is not present

■ Integrates all circuits needed for supporting a crystal oscillator with 10MHz to 40MHz frequency range

■ Incorporates a fast starting, high switching frequency,

■egative voltage generator requiring only small ceramic capacitors

■ Contains voltage regulators for an oscillator, a negative voltage generator and a 50mA 3.0V LDO output

■ Requires less than 1mA of current when powered down

■ Supply voltage ranges from 3.3V to 5.5V

APPLICATIONS

■ Cellular and Cordless Radios

■ WLAN Radios

■ Radios with GaAs FET Power Amplifiers

■ Fixed and Mobile radio transceivers