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