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