General Description

The MAX2450 combines a quadrature modulator and quadrature demodulator with a supporting oscillator and divide-by-8 prescaler on a monolithic IC. It operates from a single +3V supply and draws only 5.9mA. The demodulator accepts an amplified and filtered IF signal in the 35MHz to 80MHz range, and demodulates it into I and Q baseband signals with 51dB of voltage conversion gain. The IF input is terminated with a 400Ω thinfilm resistor for matching to an external IF filter. The baseband outputs are fully differential and have 1.2Vp-p signal swings. The modulator accepts differential I and Q baseband signals with amplitudes up to 1.35Vp-p and bandwidths to 15MHz, and produces a differential IF signal in the 35MHz to 80MHz range.

Features

♦ Combines Quadrature Modulator and Demodulator

♦ Integrated Quadrature Phase Shifters

♦ On-Chip Oscillator (Requires External Tuning Circuit)

♦ On-Chip Divide-by-8 Prescaler

♦ Modulator Input Bandwidth Up to 15MHz

♦ Demodulator Output Bandwidth Up to 9MHz

♦ 51dB Demodulator Voltage Conversion Gain

♦ CMOS-Compatible Enable

♦ 5.9mA Operating Supply Current 1µA Shutdown Supply Current

Applications

Digital Cordless Phones

GSM and North American Cellular Phones

Wireless LANs

Digital Communications

Two-Way Pagers