MAX2121

Complete Direct-Conversion L-Band Tuner

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


Please check latest availability status for a specific part variant.

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.
MAX2121: Typical Application Circuit MAX2121: Typical Application Circuit 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 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

See parametric specs for TV Tuners (9)


Part NumberApplicationsInput Frequency
(MHz)
IF Output Frequency
(MHz)
Ref. Clock Freq.
(MHz)
Noise Figure
(dB)
VSUPPLY
(V)
ISUPPLY
(mA)
Footprint
(mm x mm)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
typSee Notes
MAX2121 VSAT925 to 2175123.7512 to 3083.13 to 3.471485.0 x 5.0-40 to +85
TQFN/28
$4.46 @1k

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.

MAX2121EVKIT: Evaluation Kit for the MAX2121
Product Reliability Reports: MAX2121.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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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Related Resources


MAX2223
Ultra-Wideband, Direct-Conversion, L-Band Satellite Tuner

  • 925MHz to 2175MHz Frequency Range
  • Monolithic VCO
  • High Dynamic Range: -75dBm to 0dBm