Complete Direct-Conversion L-Band Tuner
MAX2121
19-5959; Rev 1; 7/12 EVAALVUAAILTAIOBNLEKIT
Complete Direct-Conversion L-Band Tuner
General Description
The MA...
Description
MAX2121
19-5959; Rev 1; 7/12 EVAALVUAAILTAIOBNLEKIT
Complete Direct-Conversion L-Band Tuner
General 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...
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