NXPTDA18218HNDVB-T电视硅调谐方案  2012/3/1

         NXP 公司的TDA18218HN是 DVB-T电视用的硅调谐器IC,集成了全部的调谐功能,包括选择性和提供低IF输出信号. TDA18218HN采用综合的IF滤波器,支持6MHz,7MHz以及8MHz的信道带宽,单电源3.3V工作,I2C总线接口.外接元件仅为16MHz的晶振,用作时钟发生器,主要用在DVB-T机顶盒(STB)和TV接收器.本文介绍了TDA18218HN的主要特性,方框图以及典型应用框图.

The TDA18218HN is a SiliconTuner IC designed for digital terrestrial (DVB-T) TV reception. The TDA18218HN integrates the overall tuning function, including selectivity and provides a low-IF output signal.

The TDA18218HN uses integrated IF filters to support 6 MHz, 7 MHz or 8 MHz channel bandwidths. The TDA18218HN requires only one single 16 MHz crystal for clock generation. A clock signal is available on crystal oscillator output pins (XTO_P / XTO_N) to synchronize the channel decoder.

The TDA18218HN is a low cost Silicon Tuner targeting digital terrestrial applications. The TDA18218HN matches the performance of the conventional can tuners. Additionally, the following benefits can be stated:

• Easy on-board integration

• Drastically reduces:

– the size of the tuner function

– the power consumption

TDA18218HN主要特性:

Fully integrated IF selectivity; eliminating the need for external SAW filters

Fully integrated oscillators with no external components

Integrated wideband gain control

Alignment free

RF loop-through for easy implementation in the Set-TopBox (STB)

Integrated die thermal sensor

Single 3.3 V power supply

Low power consumption (750 mW)

Crystal oscillator output buffer (16 MHz) for single crystal applications

I2C-businterface compatible with 3.3 V and 5 V microcontrollers

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