19-1627; Rev 2; 6/03
DBS Direct Downconverter
General Description
Advantages Over MAX2104
ꢀ Improved Front End Achieves 10.2dB NF at 1550MHz
ꢀ Higher Input IIP3: 11.5dBm at 1550MHz
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.
ꢀ Reduced Spurious Downconversion Products
ꢀ Capable of Using an External Synthesizer
Features
ꢀ Drop-In Replacement for MAX2104 Designs:
Requires Only Minor Software Upgrade and
Two External Resistor Value Changes
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).
ꢀ Complete Low-Cost Solution for DBS Direct
Downconversion
ꢀ High Level of Integration Minimizes Component
Count
ꢀ 1MBaud to 45MBaud Operation
ꢀ Selectable LO Buffer
ꢀ +5V Single-Supply Operation
ꢀ 925MHz to 2175MHz Input Frequency Range
Applications
U.S. DSS Set-Top Receivers
Broadband Systems
LMDS
ꢀ On-Chip Quadrature Generator, Dual-Modulus
European DVB-Compliant
Systems
Prescaler (/32, /33)
Professional Receivers
VSAT
Cellular Base Stations
Wireless Local Loop
ꢀ On-Chip Crystal Oscillator Amplifier
Microwave Links
ꢀ PLL Phase Detector with Gain-Controlled Charge
Pin Configuration
Pump
ꢀ Input Levels: -25dBm to -68dBm per Carrier
ꢀ Over 50dB Gain Control Range
TOP VIEW
ꢀ Noise Figure = 10.2dB; IIP3 = +11.5dBm
(at 1550MHz)
ꢀ Automatic Baseband Offset Correction
V
1
2
3
4
5
6
7
8
9
36 PLLIN-
35 PLLIN+
34 MOD-
33 MOD+
32 LODIVSEL
31 IOUT+
CC
CFLT
XTL-
XTL+
GND
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
V
CC
MAX2106UCM
*Exposed paddle.
0°C to +85°C
48 TQFP-EP*
MAX2106
RFIN-
RFIN+
GND
30 IOUT-
29
V
CC
28 QOUT+
27 QOUT-
26 RFBAND
25 FLCLK
GND 10
QDC- 11
QDC+ 12
Functional Diagram appears at end of data sheet.
TQFP
________________________________________________________________ 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.