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| Maxim MAX3580 TV调谐器应用方案 | |||||
作者：Maxim 文章来源：本站原创 点击数： 更新时间：2007-9-19  |
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The MAX3580 fully integrated, direct-conversion TV tuner is designed for Digital Video Broadcasting-Terrestrial (DVB-T) applications. The integrated tuner covers a 170MHz to 230MHz input frequency range for the VHF-III band and 470MHz to 878MHz for the UHF band. The MAX3580 direct-conversion tuner integrates an RF input switch and a multiband tracking filter, allowing low-power tuner-on-board applications without the cost and power-dissipation issues of dual-conversion tuner solutions. The zero-IF architecture eliminates the need for SAW filters by providing baseband I and Q outputs directly to the demodulator. In addition, DC-offset cancellation is implemented on-chip using a mixed-signal architecture to improve the second-order distortion performance and the dynamic range of the downstream digitizer and demodulator. The MAX3580 features dynamic gain control of more than 76dB and a typical midband noise figure of 4.7dB referred to the LNA input. The VCO architecture optimizes both in-band and wideband phase noise for OFDM applications where sensitivity to both 1kHz phase noise and wideband phase noise related to strong adjacents can be a problem. The MAX3580 communicates using a 2-wire serial bus. The device operates from a typical +3.3V power supply and dissipates 650mW. The MAX3580 is available in a small 32-pin thin QFN package (5mm x 5mm) with an exposed paddle. Electrical performance is guaranteed over the extended -40°C to +85°C temperature range. 主要特性: 650mW Power Dissipation (at VCC = +3.3V) I and Q Baseband Outputs Eliminate All IF-SAW Filters Integrated RF Tracking Filters Tunable Baseband Lowpass Filters Full-Band VHF-III and UHF Tuning +38dB Digital ACPR, +47dB Analog ACPR Low Noise Figure: 4.7dB (typ) Frac-N Synthesizer for -90dBc/Hz Close-In Phase Noise Baseband Overload Detector Controls RF AGC if Desired +3.1V to +3.5V Supply Voltage Range Ultra-Small, 5mm x 5mm Thin QFN Package 应用: Digital Televisions Digital Terrestrial Set-Tops Laptop Televisions Automotive Televisions USB Peripherals 图1.MAX3580方框图:  图2:应用电路图.  详情请见数据表: http://datasheets.maxim-ic.com/en/ds/MAX3580.pdf MAX3580 评估套件 The MAX3580 evaluation kit (EV kit) simplifies evaluation of the MAX3580 direct-conversion tuner. It enables testing of the devices performance and requires no additional support circuitry. Standard 50Ω SMA and BNC connectors are included on the EV kit for the inputs and outputs to allow quick and easy evaluation on the test bench. The EV kit is fully assembled and tested at the factory. This document provides a list of equipment required to evaluate the device, a straightforward test procedure to verify functionality, a description of the EV kit circuit, the circuit schematic, a bill of materials (BOM) for the kit, and artwork for each layer of the printed-circuit board (PCB).  图3.评估板电路图: 所用元器件列表:   详情请见评估板数据表: http://datasheets.maxim-ic.com/en/ds/MAX3580EVKIT.pdf |
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