MAX2106 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – DBS Direct Downconverter

19-1627; Rev 2; 6/03
DBS Direct Downconverter
General Description
The MAX2106 low-cost, direct-conversion tuner IC is
designed for use in digital direct-broadcast satellite
(DBS) television set-top box units and is a pin-for-pin
upgrade for the MAX2104. Its direct-conversion archi-
tecture reduces system cost compared to devices with
IF-based architectures. The MAX2106 directly tunes L-
band signals to baseband using a broadband I/Q
downconverter. The operating frequency range spans
925MHz to 2175MHz.
The IC includes a low-noise amplifier (LNA) with gain
control, I and Q downconverting mixers, lowpass filters
with gain and frequency control, a local oscillator (LO)
buffer with a 90° quadrature network, and a charge-
pump-based phase-locked loop (PLL) for frequency
control. The MAX2106 has an on-chip LO, requiring
only an external varactor-tuned LC tank for operation.
The LO’s output drives the internal quadrature genera-
tor and has a buffer amplifier to drive off-chip circuitry.
The MAX2106 comes in a 48-pin thin quad flat-pack
package with exposed paddle (EP).
Applications
U.S. DSS Set-Top Receivers
European DVB-Compliant
Systems
Cellular Base Stations
Wireless Local Loop
Broadband Systems
LMDS
Professional Receivers
VSAT
Microwave Links
Pin Configuration
TOP VIEW
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
MAX2106
36 PLLIN-
35 PLLIN+
34 MOD-
33 MOD+
32 LODIVSEL
31 IOUT+
30 IOUT-
29 VCC
28 QOUT+
27 QOUT-
26 RFBAND
25 FLCLK
Advantages Over MAX2104
o Improved Front End Achieves 10.2dB NF at 1550MHz
o Higher Input IIP3: 11.5dBm at 1550MHz
o Reduced Spurious Downconversion Products
o Capable of Using an External Synthesizer
Features
o Drop-In Replacement for MAX2104 Designs:
Requires Only Minor Software Upgrade and
Two External Resistor Value Changes
o Complete Low-Cost Solution for DBS Direct
Downconversion
o High Level of Integration Minimizes Component
Count
o 1MBaud to 45MBaud Operation
o Selectable LO Buffer
o +5V Single-Supply Operation
o 925MHz to 2175MHz Input Frequency Range
o On-Chip Quadrature Generator, Dual-Modulus
Prescaler (/32, /33)
o On-Chip Crystal Oscillator Amplifier
o PLL Phase Detector with Gain-Controlled Charge
Pump
o Input Levels: -25dBm to -68dBm per Carrier
o Over 50dB Gain Control Range
o Noise Figure = 10.2dB; IIP3 = +11.5dBm
(at 1550MHz)
o Automatic Baseband Offset Correction
PART
MAX2106UCM
*Exposed paddle.
Ordering Information
TEMP RANGE
0°C to +85°C
PIN-PACKAGE
48 TQFP-EP*
Functional Diagram appears at end of data sheet.
TQFP
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