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Complete Direct-Conversion L-Band Tuner

Industry's First L-Band Tuner with Internal 123MHz IF Filter

Product Details

Key Features

Applications/Uses

Parametric specs for TV Tuners
Applications VSAT
Input Frequency (MHz) 925 to 2175
IF Output Frequency (MHz) 123.75
Ref. Clock Freq. (MHz) 12 to 30
Noise Figure (dB) (typ) 8
VSUPPLY (V) 3.13 to 3.47
ISUPPLY (mA) 148
Footprint (mm x mm) 5.0 x 5.0
Oper. Temp. (°C) -40 to +85
Package/Pins TQFN/28
Budgetary
Price (See Notes)
4.46
Parametric specs for TV Tuners
Applications VSAT
Input Frequency (MHz) 925 to 2175
IF Output Frequency (MHz) 123.75
Ref. Clock Freq. (MHz) 12 to 30
Noise Figure (dB) (typ) 8
VSUPPLY (V) 3.13 to 3.47
ISUPPLY (mA) 148
Footprint (mm x mm) 5.0 x 5.0
Oper. Temp. (°C) -40 to +85
Package/Pins TQFN/28
Budgetary
Price (See Notes)
4.46
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Simplified Block Diagram

Technical Docs

Support & Training

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Filtered Search

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Parameters

Parametric specs for TV Tuners
Applications VSAT
Input Frequency (MHz) 925 to 2175
IF Output Frequency (MHz) 123.75
Ref. Clock Freq. (MHz) 12 to 30
Noise Figure (dB) (typ) 8
VSUPPLY (V) 3.13 to 3.47
ISUPPLY (mA) 148
Footprint (mm x mm) 5.0 x 5.0
Oper. Temp. (°C) -40 to +85
Package/Pins TQFN/28
Budgetary
Price (See Notes)
4.46

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 LP Filters: 123.75MHz
  • 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, 5mm x 5mm, 28-Pin TQFN Package

Applications/Uses

  • VSATs

Description

The MAX2121 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 2175MHz.

The device includes an LNA and an RF variable-gain amplifier, I and Q downconverting mixers, and baseband lowpass filters and digitally controlled baseband 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 thin QFN package.

Simplified Block Diagram

MAX2121: Typical Application Circuit MAX2121: Typical Application 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 .