Rainbow Electronics MAX2108 - Manual

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General Description
The MAX2108 is a low-cost direct-conversion tuner IC
designed for use in digital direct-broadcast satellite
(DBS) television set-top box units and microwave links.
Its direct-conversion architecture reduces system cost
compared to devices with IF-based architectures.
The MAX2108 directly tunes L-band signals to base-
band using a broadband I/Q downconverter. The oper-
ating frequency range spans from 950MHz to
2150MHz. The IC includes a low-noise amplifier (LNA)
with gain control, two downconverter mixers with output
buffers, a 90° quadrature generator, and a divide-by
32/33 prescaler.
Applications
DirecTV, PrimeStar, EchoStar DBS Tuners
DVB-Compliant DBS Tuners
Cellular Base Stations
Wireless Local Loop
Broadband Systems
LMDS
Microwave Links
Features
♦ Low-Cost Architecture
♦ Operates from Single +5V Supply
♦ On-Chip Quadrature Generator, Dual-Modulus
Prescaler (/32, /33)
♦ Input Levels: -20dBm to -70dBm per Carrier
♦ Over 50dB RF Gain-Control Range
♦ 10dB Noise Figure at Maximum Gain
♦ +8dBm IIP3 at Minimum Gain
MAX2108
Direct-Conversion Tuner IC
________________________________________________________________ Maxim Integrated Products 1
PS_SEL GC GND GND RFIN RFIN GND IOUT IOUT
PSOUT
V CC V CC
V CC
V CC
PSOUT GND GND N.C. LO LO QOUT QOUT N.C. GND
12 11 10 9 8 7 6 5 4 3 2 1
13 14 15 16 17 18 19 20 21 22 23 24
MAX2108
/32
/33
90
Q
0
I
Functional Diagram
19-1449; Rev 0; 4/99
PART
MAX2108CEG 0°C to +70°C
TEMP. RANGE PIN-PACKAGE
24 QSOP
Ordering Information
Pin Configuration appears at end of data sheet.