GENERAL DESCRIPTION

The AD6122 is a low power IF transmitter subsystem, specifically designed for CDMA applications. It consists of an I and Q modulator, a divide-by-two quadrature generator, high dynamic range IF amplifiers with voltage-controlled gain and a power-down control input. An integral low dropout regulator allows operation from battery voltages from 2.9 V to 4.2 V.

FEATURES

Fully Compliant with IS98A and PCS Specifications

Linear IF Amplifier

–63 dB to +34 dB

Linear-in-dB Gain Control

Temperature-Compensated Gain Control

Quadrature Modulator

Modulates IFs from 50 MHz to 350 MHz

Integral Low Dropout Regulator

Accepts 2.9 V to 4.2 V Input from Battery

Low Power

10.4 mA at Midgain

<10 μA Sleep Mode Operation

Companion Receiver IF Chip Available (AD6121)

APPLICATIONS

CDMA, W-CDMA, AMPS and TACS Operation

QPSK Transmitters