Maxim Integrated MAX2121 Direct-Conversion Tuner IC

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.