kak111
Advanced Member level 4
MAX2121 Industry's First L-Band Tuner with Internal 123MHz IF Filter
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.
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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.
**broken link removed**
**broken link removed**
