Synopsis: The LFAFE is a mixed signal CMOS monolithic device that acts as an interface to a set of sensors. The device provides a programmable current to energize these sensors. The response of the sensors is captured and digitized by an ADC. The results of the conversion are available to be clocked out using a 3 wire interface. A clock oscillator is provided on chip for timing purposes. A voltage reference is implemented on chip for use in A/D conversion of the sensed outputs. A communication interface using a three wire channel is used to communicate with the device. Communications consist of programming a channel identification, sensor current and settling time delay for the A/D conversion. Control logic for the various operations resides on chip. External components consist of sensors, and miscellaneous resistors and capacitors for timing. The device is packaged in a 16 pin plastic package or can be delivered as a die for direct chip on board mounting. The LFAFE can also be delivered as a computer database in GDS 2 or CIF format for use as an embedded cell in a system on chip application along with memory and other megablocks.