General Description

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

o Low-Cost Bipolar Design, Lowest Cost

Architecture

o Operate from a Single +5V Supply

o 950MHz to 2150MHz Input Frequency Range*

o On-Chip Quadrature Generator, Dual-Modulus

Prescaler (/64, /65)

o Input Levels

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

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

o Over 50dB AGC Control Range (MAX2102)

o Noise Figure = 13.2dB (MAX2102);

IP3 = 6.5dBm (at 1450MHz)

o Automatic Baseband Offset Correction

o Easy Interface to MAX1002/MAX1003 Dual ADC

and Popular Baseband ICs

Direct-Conversion Tuner ICs for

Digital DBS Applications

________________________________________________________________

Maxim Integrated Products

1

MAX2102

MAX2105

Q

I

QOUT

GND

GND

AGC

GND

RFIN

GND

GND

IOUT

OFFSET CORRECTION

/64, /65

90°

0°

RFIN

QDC

IDC

IDC

GND

LO

GND

PSGND

PSOUT

MOD

LO

QDC

14

13

12

11

10

9

8

7

6543

2

1

15

16

17

18

19

20

21

22

23

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

*

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