Rainbow-electronics MAX2104 Manual do Utilizador descarregar pdf

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 con-

verts L-band signals to baseband signals using a

broadband I/Q downconverter. The operating frequency

range extends from 925MHz to 2175MHz.

The IC includes an LNA gain control, I and Q downcon-

verting mixers, lowpass filters with gain control and fre-

quency control, a local oscillator (LO) buffer with a 90°

quadrature network, and a charge-pump based PLL for

frequency control. The MAX2104 also has an on-chip

LO, requiring only an external varactor-tuned LC tank

for operation. The output of the LO drives the internal

quadrature generator and dual modulus prescaler. An

on-chip crystal amplifier drives a reference divider as

well as a buffer amplifier to drive off-chip circuitry. The

MAX2104 is offered in a 48-pin TQFP-EP package.

Applications

DirecTV, PrimeStar, EchoStar DBS Tuners

DVB-Compliant DBS Tuners

Broadband Systems

LMDS

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

MAX2104

Direct-Conversion Tuner IC for

Digital DBS Applications

________________________________________________________________ Maxim Integrated Products 1

PLLIN-

PLLIN+

MOD-

MOD+

GND

IOUT+

IOUT-

QOUT+

QOUT-

FDOUB

FLCLK

CFLT

XTL-

XTL+

GND

RFIN-

RFIN+

GND

QDC-

QDC+

IDC-

IDC+

GND

RFOUT

CPG1

XTLOUT

CPG2

GC1

GC2

INSEL

GND

TANK+

VRLO

TANK-

GND

PSOUT-

PSOUT+

TQFP

MAX2104

TOP VIEW

PART

MAX2104CCM* 0°C to +70°C

TEMP RANGE PIN-PACKAGE

48 TQFP-EP

19-1431; Rev 3; 12/01

*Contact factory for availability.

Functional Diagram appears at end of data sheet.

Pin Configuration

Ordering Information

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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Digital DBS Applications 1

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Página 1 - Digital DBS Applications

General DescriptionThe MAX2104 low-cost direct-conversion tuner IC isdesigned for use in digital direct-broadcast satellite(DBS) television set-top bo

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MAX2104Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licens

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Rainbow-electronics MAX2104 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Hardware Rainbow-electronics MAX2104. Rainbow Electronics MAX2104 User Manual Manual do Utilizador

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