L-Band Tuner with Programmable Baseband Filter

Simplify Design with Programmable 40MHz to 124MHz IF Filter

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The MAX2121B low-cost, direct-conversion tuner IC is designed for satellite set-top and VSAT applications.

The device directly converts the satellite signals from the LNB to baseband using a broadband I/Q downconverter. The operating frequency range extends from 925MHz to 2250MHz.

The device includes an LNA and an RF variable-gain amplifier, I and Q downconverting mixers, and digitally controlled baseband filters (40MHz to 124MHz) and variable-gain amplifiers. Together, the RF and baseband variable-gain amplifiers provide more than 80dB of gain control range.

The device 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 device is the most advanced broadband/VSAT DBS tuner available. The low noise figure eliminates the need for an external LNA. A small number of passive components are needed to form a complete broadband satellite tuner DVB-S2 RF front-end solution. The tuner is available in a very small, 5mm x 5mm, 28-pin TQFN package.
MAX2121B: Functional Diagram MAX2121B: Functional Diagram Enlarge+

Key Features

  • Monolithic Receiver Saves Cost and Space
    • Integrated VCO with Low Phase Noise: -97dBc/Hz at 10kHz
    • Integrated 14-Bit Fractional-N Synthesizer
    • Address Pin Allows for Multi-Tuner Applications
  • Low Power Reduces Cost
    • 495mW Power Dissipation
    • 10mW Standby Mode
  • High Dynamic Range Eliminates Need for External LNA and/or Attenuators
    • -75dBm to 0dBm Input Power
    • 8dB Noise Figure
  • Integrated LP Filters Simplify Design
    • Programmable Bandwidth from 40MHz to 124MHz
  • Differential I/Q Interface Minimizes EMI
    • 1VP-P Full-Scale Outputs
  • Serial Interface and Small Package Reduce Size
    • 5mm x 5mm, 28-Pin TQFN Package
    • I²C 2-Wire Serial Interface


  • DBS Tuner
  • Navigation Systems
  • Satellite Set-Top Box
  • VSATs
Part NumberRef. Clock Freq.
Noise Figure
(mm x mm)
Oper. Temp.
MAX2121B 12 to 3083.13 to 3.47148
Set-Top Boxes
5.0 x 5.0-40 to +85
See All TV Tuners (8)
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.

MAX2121BEVKIT: Evaluation Kit for MAX2121B

Quality and Environmental Data

Request Reliability Report for: MAX2121B 
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CAD Symbols and Footprints

  • MAX2121BETI+
  • MAX2121BETI+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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