MAX2120_10 Datasheet, PDF (1/21 Pages) Maxim Integrated Products – Complete, Direct-Conversion Tuner for DVB-S and Free-to-Air Applications

19-0832; Rev 2; 5/10
EVAALVUAAILTAIOBNLEKIT
Complete, Direct-Conversion Tuner for DVB-S
and Free-to-Air Applications
General Description
The MAX2120 low-cost, direct-conversion tuner IC is
designed for satellite set-top and VSAT applications.
The IC is intended for QPSK, Digital Video Broadcast
(DVB-S), DSS, and free-to-air applications.
The MAX2120 directly converts the satellite signals
from the LNB to baseband using a broadband I/Q
downconverter. The operating frequency range extends
from 925MHz to 2175MHz.
The device includes an LNA and an RF variable-gain
amplifier, I and Q downconverting mixers, and baseband
lowpass filters with programmable cutoff frequency
control and digitally controlled baseband variable-gain
amplifiers. Together, the RF and baseband variable-gain
amplifiers provide more than 80dB of gain-control range.
The IC is compatible with virtually all QPSK demodulators.
The MAX2120 includes fully monolithic VCOs, as well as
a complete frequency synthesizer. Additionally, an on-
chip crystal oscillator is provided along with a buffered
output for driving additional tuners and demodulators.
Synthesizer programming and device configuration are
accomplished with a 2-wire serial interface. The IC fea-
tures a VCO autoselect (VAS) function that automatically
selects the proper VCO. For multituner applications, the
device can be configured to have one of two 2-wire
interface addresses. A low-power standby mode is
available whereupon the signal path is shut down while
leaving the reference oscillator, digital interface, and
buffer circuits active, providing a method to reduce
power in single and multituner applications.
The MAX2120 is the most advanced DBS tuner available
today. The low noise figure eliminates the need for an
external LNA. A small number of passive components are
needed to form a complete DVB, DBS, or VSAT RF front-
end solution. The tuner is available in a very small 28-pin
thin QFN package.
Applications
DirecTV and Dish Network DBS
DVB-S
Two-Way Satellite Systems
VSATs
Free-to-Air
Features
o 925MHz to 2175MHz Frequency Range
o Monolithic VCO: No Calibration Required
o -75dBm to 0dBm High Dynamic Range
o 4MHz to 40MHz Integrated Variable BW LP Filters
o Single +3.3V ±5% Supply
o Low-Power Standby Mode
o Address Pin for Multituner Applications
o Differential I/Q Interface
o I²C 2-Wire Serial Interface
o Very Small 28-Pin Thin QFN Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX2120CTI+
0°C to +70°C 28 Thin QFN-EP*
*EP = Exposed paddle.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration/
Functional Diagram
+ ²⁸
27
26
25
24
VCC_RF2 1
VCC_RF1 2
INTERFACE LOGIC
AND CONTROL
MAX2120
LPF BW
CONTROL
23
22
DC OFFSET
CORRECTION
21 IDC+
20 IOUT-
GND 3
19 ^IOUT+
RFIN 4
18 QOUT-
GC1 5
VCC_LO 6
DIV2/DIV4
EP
FREQUENCY
SYNTHESIZER
VCC_VCO 7
8
9
10
11
12
17 ^QOUT+
÷
16 VCC_DIG
15 REFOUT
13
14
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.