MAX2120EVKIT+【PDF 1/21 页】KIT EVAL FOR MAX2120

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ATION

ILABLE

19-0832; Rev 2; 5/10

EVALU

AVA

KIT

Complete, Direct-Conversion Tuner for DVB-S

and Free-to-Air Applications

General Description

Features

The MAX2120 low-cost, direct-conversion tuner IC is

designed for satellite set-top and VSAT applications.

The IC is intended for QPSK, Digital Video Broadcast

(DVB-S), DSS, and free-to-air applications.

The MAX2120 directly converts the satellite signals

from the LNB to baseband using a broadband I/Q

downconverter. The operating frequency range extends

from 925MHz to 2175MHz.

The device includes an LNA and an RF variable-gain

amplifier, I and Q downconverting mixers, and baseband

lowpass filters with programmable cutoff frequency

control and digitally controlled baseband variable-gain

amplifiers. Together, the RF and baseband variable-gain

amplifiers provide more than 80dB of gain-control range.

The IC is compatible with virtually all QPSK demodulators.

925MHz to 2175MHz Frequency Range

Monolithic VCO: No Calibration Required

-75dBm to 0dBm High Dynamic Range

4MHz to 40MHz Integrated Variable BW LP Filters

Single +3.3V ±5% Supply

Low-Power Standby Mode

Address Pin for Multituner Applications

Differential I/Q Interface

I 2 C 2-Wire Serial Interface

Very Small 28-Pin Thin QFN Package

Ordering Information

The MAX2120 includes fully monolithic VCOs, as well as

PART

TEMP RANGE

PIN-PACKAGE

a complete frequency synthesizer. Additionally, an on-

chip crystal oscillator is provided along with a buffered

output for driving additional tuners and demodulators.

Synthesizer programming and device configuration are

accomplished with a 2-wire serial interface. The IC fea-

tures a VCO autoselect (VAS) function that automatically

selects the proper VCO. For multituner applications, the

device can be configured to have one of two 2-wire

interface addresses. A low-power standby mode is

available whereupon the signal path is shut down while

leaving the reference oscillator, digital interface, and

buffer circuits active, providing a method to reduce

MAX2120CTI+ 0°C to +70°C 28 Thin QFN-EP*

* EP = Exposed paddle.

+ Denotes a lead(Pb)-free/RoHS-compliant package.

Pin Configuration/

Functional Diagram

power in single and multituner applications.

The MAX2120 is the most advanced DBS tuner available

today. The low noise figure eliminates the need for an

external LNA. A small number of passive components are

VCC_RF2

VCC_RF1

INTERFACE LOGIC

AND CONTROL

MAX2120

LPF BW

CONTROL

DC OFFSET

CORRECTION

IDC+

IOUT-

needed to form a complete DVB, DBS, or VSAT RF front-

end solution. The tuner is available in a very small 28-pin

thin QFN package.

GND

RFIN

IOUT+

QOUT-

Applications

DirecTV and Dish Network DBS

GC1

QOUT+

DVB-S

Two-Way Satellite Systems

VCC_LO

DIV2/DIV4

FREQUENCY

SYNTHESIZER

VCC_DIG

VSATs

VCC_VCO

REFOUT

Free-to-Air

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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