ADI AD7879 12位SAR ADC评估方案

ADI 公司的AD7879/AD7889是带同步串行接口和低导通电阻开关的 12位SAR ADC,可以驱动4线电阻型触摸屏.单电源1.6V-3.6V工作,吞吐量速率高达105kSPS.主要用于PDA,智能手持设备,触摸屏监视器,POS终端,医疗设备和手机.本文介绍AD7879/AD7889主要特性, 功能方框图, 模拟输入架构框图, 典型应用电路图和AD7879评估板主要特性与电路图.

The AD7879/AD7889 are 12-bit successive approximation analog-to-digital converters (SAR ADCs) with a synchronous serial interface and low on-resistance switches for driving 4-wire resistive touch screens. The AD7879/AD7889 work with a very low power supply—a single 1.6 V to 3.6 V supply—and feature throughput rates of 105 kSPS. The devices include a shutdown mode that reduces current consumption to less than 6 μA. To reduce the effects of noise from LCDs and other sources, the AD7879/AD7889 contain a preprocessing block. The preprocessing function consists of a median filter and an averaging filter.
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