MAX2112

Complete, Direct-Conversion Tuner for DVB-S2 Applications

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


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 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.
MAX2112: Pin Configuration/Functional Diagram MAX2112: Pin Configuration/Functional Diagram Enlarge+

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
  • I²C 2-Wire Serial Interface
  • Very Small 28-Pin TQFN Package

Applications/Uses

  • DirecTV and Dish Network DBS
  • DVB-S2
  • VSATs
Part Number Ref. Clock Freq.
(MHz)
IF fOUT
(MHz)
Noise Figure
(dB)
VSUPPLY
(V)
ISUPPLY
(mA)
Applications fIN Footprint
(mm x mm)
Budgetary
Price
typ See Notes
MAX2112  12 to 30 40 8 3.3 ±5% 100 DVB-S2 925 to 2175 5.0 x 5.0 $4.42 @1k
See All TV Tuners (10)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX2112EVKIT: Evaluation Kit for the MAX2112
 

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