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Complete, Direct-Conversion Tuner for DVB-S and Free-to-Air Applications

3.3V Satellite Tuner Provides Low Noise Figure and High Linearity at Only 330mW

Product Details

Key Features

Parametric specs for TV Tuners
End Equipment DVB-S
Input Frequency (MHz) 925 to 2175
IF Output Frequency (MHz) 40
Ref. Clock Freq. (MHz) 4 to 8
Noise Figure (dB) (typ) 8
VSUPPLY (V) 3.13 to 3.47
ISUPPLY (mA) 100
Footprint (mm x mm) 5.0 x 5.0
Oper. Temp. (°C) 0 to +70
Package/Pins TQFN/28
Budgetary
Price (See Notes)
2.18
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Simplified Block Diagram

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Parameters

Parametric specs for TV Tuners
End Equipment DVB-S
Input Frequency (MHz) 925 to 2175
IF Output Frequency (MHz) 40
Ref. Clock Freq. (MHz) 4 to 8
Noise Figure (dB) (typ) 8
VSUPPLY (V) 3.13 to 3.47
ISUPPLY (mA) 100
Footprint (mm x mm) 5.0 x 5.0
Oper. Temp. (°C) 0 to +70
Package/Pins TQFN/28
Budgetary
Price (See Notes)
2.18

Key Features

  • 925MHz to 2175MHz Frequency Range
  • Monolithic VCO: No Calibration Required
  • -75dBm to 0dBm High Dynamic Range
  • 4MHz to 40MHz Integrated Variable BW LP Filters
  • 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 Thin QFN Package

Applications/Uses

  • DirecTV and Dish Network DBS
  • DVB-S
  • Free-to-Air
  • Two-Way Satellite Systems
  • VSATs

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 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 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.

Simplified Block Diagram

MAX2120: Typical Operating Circuit MAX2120: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .