The ICL7106 and ICL7107 are the first ICs to contain all the active circuitry for a 3 1/2 digital panel meter on a single chip. The ICL7106 is designed to interface with a liquid crystal display (LCD) while the ICL7107 is intended for light-emitting diode (LED) displays. In addition to a precision dual slope converter, both circuits contain BCD to seven segment decoders, display drivers, a clock and a reference. To build a high performance panel meter it is only necessary to add display, 4 resistors, 4 capacitors and an input filter if required.