MAX2112 Complete, Direct-Conversion Tuner for DVB-S2 Applications
The MAX2112 directly converts the satellite signals from the LNB to baseband using a broadband l/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 down convert! ng mixers, and baseband lowpass filters with programmable cutoff frequency control and digitally con trolled baseba nd variable-gain amplifiers. Together, the RF and baseband variable-gain amplifiers provide more than 80dB of gain control range. The IC is compatible with virtually all DVB-S2 demodulators.
The MAX2112 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 in terface addresses. A low-power stan dby 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 MAX2112 is the most advanced DBS tuner available today. The low noise figure eliminates the need for an external LNA. A small number of passive components are needed to form a complete DVB-S2 RF front-end solution. The tuner is available in a very small 28-pin thin QFN package.
●Features
■925MHz to 2175MHz Frequency Range
■Monolithic VCO
▲Low Phase Noise: -97dBc/Hz at 10kHz
▲No Calibration Required
■High Dynamic Range: -75dBm to 0dBm
■Integrated Variable BW LP Filters: 4MHz to 40MHz
■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 28-Pin TQFN Package
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Complete, Direct-Conversion Tuner 、 low-cost, direct-conversion tuner IC 、 Evaluation Kit |
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[ DirecTV and Dish Network DBS ][ DVB-S2 ][ VSATs ] |
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Datasheet |
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Please see the document for details |
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QFN;QFN-EP;TQFN-EP |
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English Chinese Chinese and English Japanese |
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4/20 |
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Rev 3 |
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19-0869 |
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1 MB |
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