MAX2112:Complete, Direct-Conversion Tuner for DVB-S2 Applications

3.3V Satellite Tuner Provides DVB-S2 Performance at Only 330mW

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 interface. 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 interface, and buffer circuits active, providing a method to reduce power in single and multituner applications. The MAX2112 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-S2 RF front-end solution. The tuner is available in a very small 28-pin thin QFN package.

Key Features
  • 925MHz to 2175MHz Frequency Range
  • Monolithic VCO
    • Low Phase Noise: -97dBc/Hz at 10kHz
    • No Calibration Required
  • High Dynamic Range: -75dBm to 0dBm
  • Integrated Variable BW LP Filters: 4MHz to 40MHz
  • Single +3.3V ±5% Supply
  • Low-Power Standby Mode
  • Address Pin for Multituner Applications
  • Differential I/Q Interface
  • I?C 2-Wire Serial Interface
  • Very Small 28-Pin TQFN Package
MAX2112: Pin Configuration/Functional Diagram
MAX2112: Pin Configuration/Functional Diagram
  • DirecTV and Dish Network DBS
  • DVB-S2
  • VSATs
titleDownload file
MAX2112?Data SheetMAX2112.pdf
Part NumberRef. Clock Freq.
Input Frequency
IF Output Freq.
Noise Figure
(mm x mm)
Oper. Temp.
typSee Notes
MAX211212 to 30925 to 21754083.13 to 3.47100DVB-S25.0 x 5.0-40 to +85
0 to +70
TQFN/28$4.42 @1k
Design kits & evaluation modules
Quality and Environmental Data
Related Products
  • MAX2120:Complete, Direct-Conversion Tuner for DVB-S and Free-to-Air Applications
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX2112CTI+ActiveTQFN,;28 pin;26 mm?0°C to +70°CLead Free
MAX2112CTI+TActiveTQFN,;28 pin;26 mm?0°C to +70°CLead Free
MAX2112ETI+ActiveTQFN,;28 pin;26 mm?-40°C to +85°CLead Free
MAX2112ETI+TActiveTQFN,;28 pin;26 mm?-40°C to +85°CLead Free
MAX2112ETI/GG8ActiveTQFN;-40°C to +85°CSee data sheet
MAX2112.pdf MAX2112
MAX2112_cn.pdf MAX2112
MAX2112.pdf MAX2112
MAX2112_cn.pdf MAX2112
MAX2112.pdf MAX2112
General Layout Guidelines for RF and Mixed-Signal PCBs MAX5862
MAX2112.pdf MAX2112
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