ADC1210型12位A/D转换器的应用开发

 一、引言 ADC1210是美国National Semiconductor公司生产的一种低功耗、中速、低价格的12位二进制码（原码、或反码、或偏置码）逐次逼近式A/D转换器。该器件采用CMOS工艺和薄膜工艺相结合的微电子技术制成。器件中包含了R-2R梯形薄膜电阻网络、CMOS模拟开关和逐次逼近逻辑电路、以及场效应管电压比较器等有关电路。其基本技术指标为分辨

APPLICATION DEVELOPMENT OF ADC 1210 A/D CONVERTER

On the basis of analyzing internal input circuit of ADC 1210 12 bits A/D converter, an improved connection of external circuit is derived in this paper.It operates only from a single power supply voltage of +5.12V to complete bipolar analog voltage A/D conversion for input D.C signal of 0±5.12V.Its resolution and accuracy are identical with those of the normal connection,but its power dissipation is less,Moreover,its input or output digital signal levels are the same as the level of 5V CMOS integrated circuits. In other words,it can match with TTL IC or 5V CMOS IC without any interface circuit.