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Maxim Integrated MAX2121 Direct-Conversion Tuner IC

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Maxim MAX2121 Direct-Conversion Tuner IC is a low-cost, direct-conversion tuner IC designed for satellite set-top and VSAT applications. It directly converts the satellite signals from the LNB to the 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 base-band lowpass filters and digitally controlled baseband variable-gain amplifiers. Together, the RF and base-band variable-gain amplifiers provide more than 80dB of gain control range.

The Maxim MAX2121 includes fully monolithic VCOs, and 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.

  • 925MHz to 2175MHz frequency range
  • Monolithic VCO
    • -97dBc/Hz at 10kHz low phase noise
    • No calibration required
  • -75dBm to 0dBm high dynamic range
  • 123.75MHz integrated 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, 5mm x 5mm, 28-pin TQFN package


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