General Description

The MAX2106 low-cost, direct-conversion tuner IC is designed for use in digital direct-broadcast satellite (DBS) television set-top box units and is a pin-for-pin upgrade for the MAX2104. Its direct-conversion architecture reduces system cost compared to devices with IF-based architectures. The MAX2106 directly tunes L-band signals to baseband using a broadband I/Q downconverter. The operating frequency range spans 925MHz to 2175MHz.

Features

♦ Drop-In Replacement for MAX2104 Designs Requires Only Minor Software Upgrade and Two External Resistor Value Changes

♦ Complete Low-Cost Solution for DBS Direct Downconversion

♦ High Level of Integration Minimizes Component Count

♦ 1MBaud to 45MBaud Operation

♦ Selectable LO Buffer

♦ +5V Single-Supply Operation

♦ 925MHz to 2175MHz Input Frequency Range

♦ On-Chip Quadrature Generator, Dual-Modulus Prescaler (/32, /33)

♦ On-Chip Crystal Oscillator Amplifier

♦ PLL Phase Detector with Gain-Controlled Charge Pump

♦ Input Levels: -25dBm to -68dBm per Carrier

♦ Over 50dB Gain Control Range

♦ Noise Figure = 10.2dB; IIP3 = +11.5dBm (at 1550MHz)

♦ Automatic Baseband Offset Correction

Applications

U.S. DSS Set-Top Receivers

European DVB-Compliant Systems

Cellular Base Stations

Wireless Local Loop

Broadband Systems

LMDS

Professional Receivers

VSAT

Microwave Links