General Description

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

Features

♦ Low-Cost Architecture

♦ Operates from Single 5V Supply

♦ 925MHz to 2175MHz Input Frequency Range

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

♦ On-Chip Crystal Amplifier

♦ PLL Mixer with Gain-Controlled Charge Pump

♦ Input Levels: -25dBm to -65dBm per Carrier

♦ Over 40dB Gain Control Range

♦ Noise Figure = 11.5dB; IIP3 = 7dBm (at 1550MHz)

♦ Automatic Baseband Offset Correction

♦ Loopthrough Replaces External Splitter

♦ Crystal Output Buffer

Applications

DirecTV, PrimeStar, EchoStar DBS Tuners

DVB-Compliant DBS Tuners

Broadband Systems

LMDS