MAX2104 Datasheet, PDF (1/9 Pages) Maxim Integrated Products – Direct-Conversion Tuner IC for Digital DBS Applications

19-1431; Rev 3; 12/01
Direct-Conversion Tuner IC for
Digital DBS Applications
General Description
The MAX2104 low-cost direct-conversion tuner IC is
designed for use in digital direct-broadcast satellite
(DBS) television set-top box units. Its direct-conversion
architecture reduces system cost compared to devices
with IF-based architectures. The MAX2104 directly con-
verts L-band signals to baseband signals using a
broadband I/Q downconverter. The operating frequency
range extends from 925MHz to 2175MHz.
The IC includes an LNA gain control, I and Q downcon-
verting mixers, lowpass filters with gain control and fre-
quency control, a local oscillator (LO) buffer with a 90°
quadrature network, and a charge-pump based PLL for
frequency control. The MAX2104 also has an on-chip
LO, requiring only an external varactor-tuned LC tank
for operation. The output of the LO drives the internal
quadrature generator and dual modulus prescaler. An
on-chip crystal amplifier drives a reference divider as
well as a buffer amplifier to drive off-chip circuitry. The
MAX2104 is offered in a 48-pin TQFP-EP package.
Applications
DirecTV, PrimeStar, EchoStar DBS Tuners
DVB-Compliant DBS Tuners
Broadband Systems
LMDS
Features
o Low-Cost Architecture
o Operates from Single 5V Supply
o 925MHz to 2175MHz Input Frequency Range
o On-Chip Quadrature Generator, Dual-Modulus
Prescaler (/32, /33)
o On-Chip Crystal Amplifier
o PLL Mixer with Gain-Controlled Charge Pump
o Input Levels: -25dBm to -65dBm per Carrier
o Over 40dB Gain Control Range
o Noise Figure = 11.5dB; IIP3 = 7dBm (at 1550MHz)
o Automatic Baseband Offset Correction
o Loopthrough Replaces External Splitter
o Crystal Output Buffer
Ordering Information
PART
TEMP RANGE
MAX2104CCM*
0°C to +70°C
*Contact factory for availability.
PIN-PACKAGE
48 TQFP-EP
Functional Diagram appears at end of data sheet.
TOP VIEW
Pin Configuration
V_CC 1
CFLT 2
XTL- 3
XTL+ 4
GND 5
V_CC 6
RFIN- 7
RFIN+ 8
GND 9
GND 10
QDC- 11
QDC+ 12
MAX2104
36 PLLIN-
35 PLLIN+
34 MOD-
33 MOD+
32 GND
31 IOUT+
30 IOUT-
29 V_CC
28 QOUT+
27 QOUT-
26 FDOUB
25 FLCLK
TQFP
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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.