19-1449; Rev 1; 6/05
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.
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
Features
MAX2108
Applications
DirecTV, PrimeStar, EchoStar DBS Tuners
DVB-Compliant DBS Tuners
Cellular Base Stations
Wireless Local Loop
Broadband Systems
LMDS
Microwave Links
PART
MAX2108CEG
MAX2108CEG+
Ordering Information
TEMP RANGE
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
24 QSOP
24 QSOP
+Denotes
lead-free package.
Pin Configuration appears at end of data sheet.
Functional Diagram
V
CC
12
PS_SEL
11
GC
10
GND
9
GND
8
RFIN
7
RFIN
6
V
CC
5
GND
4
V
CC
3
IOUT
2
IOUT
1
I
/32
/33
0
90
MAX2108
Q
13
PSOUT
14
PSOUT
15
GND
16
GND
17
N.C.
18
LO
19
LO
20
N.C.
21
V
CC
22
GND
23
QOUT
24
QOUT
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
