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| Maxim MAX2120机顶盒调谐方案 | |||||
作者：Maxim 文章来源：Maxim 点击数： 更新时间：2007-12-4  |
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概述： The MAX2120 low-cost, direct-conversion tuner IC is designed for satellite set-top and VSAT applications. The IC is intended for QPSK, Digital Video Broadcast (DVB-S), DSS, and free-to-air applications. The MAX2120 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 with programmable cutoff frequency control and digitally controlled baseband 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 QPSK demodulators. The MAX2120 includes fully monolithic VCOs, as well as a complete frequency synthesizer. Additionally, an onchip 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 MAX2120 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, DBS, or VSAT RF frontend solution. The tuner is available in a very small 28-pin thin QFN package. 主要特性： ♦ 925MHz to 2175MHz Frequency Range ♦ Monolithic VCO: No Calibration Required ♦ -75dBm to 0dBm High Dynamic Range ♦ 4MHz to 40MHz Integrated Variable BW LP Filters ♦ Single +3.3V ±5% Supply ♦ Low-Power Standby Mode ♦ Multiple 2-Wire Addresses for Multituner ♦ Differential I/Q Interface ♦ I2C 2-Wire Serial Interface ♦ Very Small 28-Pin Thin QFN Package 应用： DirecTV and Dish Network DBS DVB-S Two-Way Satellite Systems VSATs Free-to-Air MAX2120功能方框图：  典型应用电路图：  详情请见MAX2120数据表： http://datasheets.maxim-ic.com/en/ds/MAX2120.pdf |
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