DESCRIPTION
The LTC®1758-2 is a dual band RF power controller for RF power amplifiers operating in the 850MHz to 2GHz range. The loop bandwidth reduction to 250kHz improves frequency stability when controlling slow turn-on PAs such as the Philips BGY280, Conexant RM009/ CX77302, Anadigics AWT6102/AWT6107 and the Hitachi PF08107/PF08123B.

FEATURES
■ Dual Band RF Power Amplifier Control (LTC1758-2)
■ Internal Schottky Diode Detector with Improved Dynamic Range vs LTC1757A
■ Wide Input Frequency Range: 850MHz to 2GHz
■ Autozero Loop Cancels Offset Errors and Temperature Dependent Offsets
■ Wide VIN Range: 2.7V to 6V Allows Direct Connection to Battery
■ RF Output Power Set by External DAC
■ 250kHz Control Loop Bandwidth
■ Fast Acquire After Transmit Enable
■ Internal Frequency Compensation
■ Rail-to-Rail Power Control Outputs
■ Power Control Signal Overvoltage Protection
■ Low Operating Current: 1mA
■ Very Low Shutdown Current: <1µA
■ Available in 8-Pin MSOP (LTC1758-1) and 10-Pin MSOP (LTC1758-2) Packages
■ Pin Compatible with LTC1757A-X
■ Improved Start Voltage Accuracy
■ Improved PCTL Input Filtering

APPLICATIONS
■ Single and Dual Band GSM/GPRS Cellular Telephones
■ PCS Devices
■ Wireless Data Modems
■ U.S. TDMA Cellular Phones