The Intersil HI7131 and HI7133 are 31/2 digit, A/D converters that have been optimized for superior DC Common Mode Rejection (CMRR) when used with a split 5V supply or a single 9V battery. The HI7131 contains all the necessary active components on a single IC to directly interface an LCD (Liquid Crystal Display). The supply current is under 100A and is ideally suited for battery operation. The HI7133 contains all the necessary active components on a single IC to directly interface an LED (Light Emitting Diode).