MAX2108 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – Direct-Conversion Tuner IC

19-1449; Rev 0; 4/99
Direct-Conversion Tuner IC
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.
Features
o Low-Cost Architecture
o Operates from Single +5V Supply
o On-Chip Quadrature Generator, Dual-Modulus
Prescaler (/32, /33)
o Input Levels: -20dBm to -70dBm per Carrier
o Over 50dB RF Gain-Control Range
o 10dB Noise Figure at Maximum Gain
o +8dBm IIP3 at Minimum Gain
Applications
DirecTV, PrimeStar, EchoStar DBS Tuners
DVB-Compliant DBS Tuners
Cellular Base Stations
Wireless Local Loop
Broadband Systems
LMDS
Microwave Links
PART
MAX2108CEG
Ordering Information
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
24 QSOP
Pin Configuration appears at end of data sheet.
Functional Diagram
V_CC
PS_SEL
GC
GND
GND
RFIN
RFIN
V_CC
GND
V_CC
IOUT
IOUT
12
11
10
9
8
7
6
5
4
3
2
1
I
/32
/33
MAX2108
0
90
Q
13
14
15
16
17
18
PSOUT PSOUT GND
GND
N.C.
LO
19
20
LO
N.C.
21
22
V_CC
GND
23
QOUT
24
QOUT
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