MAX2108

Direct-Conversion Tuner IC

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Overview

Low-Cost Architecture
Operates from Single +5V Supply
On-Chip Quadrature Generator, Dual-Modulus Prescaler (/32, /33)
Input Levels: -20dBm to -70dBm per Carrier
Over 50dB RF Gain-Control Range
10dB Noise Figure at Maximum Gain
+8dBm IIP3 at Minimum Gain

The MAX2108 is a low-cost direct-conversion tuner IC designed for use in digital direct-broadcast satellite (DBS) television set-top box units and microwave links. Its direct-conversion architecture reduces system cost compared to devices with IF-based architectures.

The MAX2108 directly tunes L-band signals to baseband using a broadband I/Q downconverter. The operating frequency range spans from 950MHz to 2150MHz. The IC includes a low-noise amplifier (LNA) with gain control, two downconverter mixers with output buffers, a 90° quadrature generator, and a divide-by 32/33 prescaler.

Applications