Description

The HFA3765 is a monolithic quadrature demodulator and a gain control amplifier stage with 90dB of dynamic range for CDMA/AMPS cellular applications. Two amplifier inputs are provided for interfacing different IF input filters. A local oscillator input requires low drive levels and a divide by two phase shifter with duty cycle compensation achieves excellent phase and amplitude balance properties. The HFA3765 is one of the four chips in the PRISM? chip set and is housed in a 28 lead SSOP package ideally suited to cellular handset applications

Features

DescriptionIF Operation10MHz to 250MHz

? I/Q Amplitude and Phase Balance . . 0.5dB, 2 Degrees

? Voltage Gain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .>60dB

? AGC Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90dB

? Output P1dB With 20pF Load . . . . . . . . . . . . . . . 2.5VPP

? Low LO Drive Level . . . . . . . . . . . . . . . . . . . . . . -10dBm

? Power Enable/Disable Control

? Single Supply Battery Operation . . . . . . . . . 2.7 to 3.3V

Applications

? IS-95A CDMA/AMPS Dual Mode Handsets

? Wideband CDMA Handsets

? Full Duplex Transceivers

? CDMA/TDMA Packet Protocol Radios