MAX2112_10 Datasheet, PDF (1/19 Pages) Maxim Integrated Products – Complete, Direct-Conversion Tuner for DVB-S2 Applications

19-0869; Rev 2; 5/10
EVAALVUAAILTAIOBNLEKIT
Complete, Direct-Conversion
Tuner for DVB-S2 Applications
General Description
The MAX2112 low-cost, direct-conversion tuner IC is
designed for satellite set-top and VSAT applications.
The IC is intended for 8PSK and Digital Video
Broadcast (DVB-S2) applications.
The MAX2112 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 DVB-S2 demodulators.
The MAX2112 includes fully monolithic VCOs, as well as
a complete fractional-N 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 inter-
face. The IC features 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 inter-
face, and buffer circuits active, providing a method to
reduce power in single and multituner applications.
The MAX2112 is the most advanced DBS tuner avail-
able today. The low noise figure eliminates the need for
an external LNA. A small number of passive compo-
nents are needed to form a complete DVB-S2 RF front-
end solution. The tuner is available in a very small
28-pin thin QFN package.
Applications
DirecTV and Dish Network DBS
DVB-S2
VSATs
Features
o 925MHz to 2175MHz Frequency Range
o Monolithic VCO
Low Phase Noise: -97dBc/Hz at 10kHz
No Calibration Required
o High Dynamic Range: -75dBm to 0dBm
o Integrated Variable BW LP Filters: 4MHz to 40MHz
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 TQFN Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX2112CTI+
0°C to +70°C
28 Thin QFN-EP*
MAX2112ETI+
-40°C to +85°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
MAX2112
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
17 ^QOUT+
16 VCC_DIG
VCC_VCO 7
15 REFOUT
8
9
10
11
12
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.