Rainbow-electronics MAX2105 Manual do Utilizador descarregar pdf

General Description

The MAX2102/MAX2105

†

are low-cost direct-conver-

sion tuner ICs designed for use in digital direct-broad-

cast satellite (DBS) television set-top box units. The

direct-conversion architecture reduces system cost

compared to devices with IF-based architectures.

The MAX2102/MAX2105 directly tune L-band signals to

baseband using a broadband I/Q downconverter.

Operating frequency range spans from at least 950MHz

to 2150MHz.

The ICs include a low-noise amplifier (LNA) with auto-

matic gain control (AGC), two downconverter mixers,

an oscillator buffer with 90° quadrature generator and

prescaler, and baseband amplifiers.

The MAX2102 features an AGC range of 50dB, allowing

input power levels as low as -69dBm. The MAX2105

has a reduced AGC range of 41dB and accepts input

power levels down to -60dBm. The reduced AGC range

of the MAX2105 allows the use of a high-gain external

LNA to achieve a lower system noise figure (NF).

________________________Applications

DBS Tuners Wireless Local Loop

DVB-Compliant DBS Tuners Broadband Systems

Cellular Base Stations LMDS

____________________________Features

♦ Low-Cost Bipolar Design, Lowest Cost

Architecture

♦ Operate from a Single +5V Supply

♦ 950MHz to 2150MHz Input Frequency Range*

♦ On-Chip Quadrature Generator, Dual-Modulus

Prescaler (/64, /65)

♦ Input Levels

-69dBm to -19dBm per Carrier (MAX2102)

-60dBm to -19dBm per Carrier (MAX2105)

♦ Over 50dB AGC Control Range (MAX2102)

♦ Noise Figure = 13.2dB (MAX2102);

IP3 = 6.5dBm (at 1450MHz)

♦ Automatic Baseband Offset Correction

♦ Easy Interface to MAX1002/MAX1003 Dual ADC

and Popular Baseband ICs

MAX2102/MAX2105

Direct-Conversion Tuner ICs for

Digital DBS Applications

________________________________________________________________

Maxim Integrated Products

MAX2102

MAX2105

QOUT GND GND AGC GND RFIN V

GND V

GND IOUT V

OFFSET CORRECTION

/64, /65

90°

0°

RFIN

QDC

IDC IDC GND V

LO V

GND PSGND PSOUT MOD V

LOQDC

13121110987654321

15 16 17 18 19 20 21 22

24 25 26 27 28

Functional Diagram

19-1256; Rev 2; 10/98

PART

MAX2102CWI

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

28 SO

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

Ordering Information

†

Patents pending

Contact factory for MAX2102/MAX2105 versions with expanded frequency range.

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

MAX2105CWI

0°C to +70°C 28 SO

1 2 3 4 5 6 ... 15 16

Resumo do Conteúdo

Página 1 - Digital DBS Applications

General DescriptionThe MAX2102/MAX2105†are low-cost direct-conver-sion tuner ICs designed for use in digital direct-broad-cast satellite (DBS) televis

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MAX2102/MAX2105Direct-Conversion Tuner ICs forDigital DBS Applications10 _____________________________________________________________________________

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MAX2102/MAX2105Direct-Conversion Tuner ICs forDigital DBS Applications________________________________________________________________________________

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MAX2102/MAX2105GaAsFET can serve this function. This circuitry is usual-ly required in order to meet system noise-figure require-ments, may provide a

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Offset CorrectionThe internal offset-correction amplifiers remove the DCoffsets present in the baseband amplifiers. The offset-correction loop effecti

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MAX2102/MAX2105Power-Supply SequencingThe MAX2102/MAX2105 have several +5V supply pins.The supply layout should be in a star format, with abypass capa

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MAX2102/MAX2105Direct-Conversion Tuner ICs forDigital DBS Applications________________________________________________________________________________

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AGC Input Bias CurrentMAX2102/MAX2105Direct-Conversion Tuner ICs forDigital DBS Applications2 ________________________________________________________

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MAX2102/MAX2105Direct-Conversion Tuner ICs forDigital DBS Applications________________________________________________________________________________

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MAX2102/MAX2105Direct-Conversion Tuner ICs forDigital DBS Applications________________________________________________________________________________

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MAX2102/MAX2105Direct-Conversion Tuner ICs forDigital DBS Applications________________________________________________________________________________

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MAX2102/MAX2105Direct-Conversion Tuner ICs forDigital DBS Applications________________________________________________________________________________

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