The ES 5106 is a low power monolithic CMOS 3 1/2 digit LCD display A/D converter. The single chip ES 5106 provides all necessary active devices which contains the internal clock, voltage reference, sevensegment decoders, LCD display drivers and a back plane driver. The improved internal zener reference voltage circuit gives the analog common a small temperature coefficient of 60 ppm/ typically. The high accuracy characteristics of the ES5106 perform very low linearity error and rollover error. The high input impedance (>1012) and low input leakage current (1pA typical) give the ES5106 a good application in the field of high impedance circuit measurement. The differential input and reference are suitable for measuring bridge transducer or ohms by using ratiometric method. The dual slope conversion technique makes the ES5106 a good normal and common mode rejection ratio. With a suitable oscillator frequency, the ES5106 has a high rejection of 50HZ, 60HZ and 400HZ line frequency noise.