MAX2121 Datasheet | Maxim Integrated

19-5959; Rev 1; 7/12 EVAALVUAAILTAIOBNLEKIT plete 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 80d B of gain control range. The device includes fully monolithic VCOs, as well as a plete 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 acplished 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 ponents are needed to form a plete 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. VSATs Applications Features o 925MHz to 2175MHz Frequency Range o Monolithic VCO Low Phase Noise: -97d Bc/Hz at 10k Hz No Calibration Required o High Dynamic Range: -75d Bm to 0d Bm o Integrated LP Filters: 123.75MHz o Single...