The AIC1638 is a compact, integrated receiver amplifier designed for high-sensitivity photo diodes used in applications like light barriers, smoke detectors, light curtains, and similar. Filtering out ambient light and amplifying the detected pulses from a photo diode, the conditioned signals are used for driving a current mirror output stage. Implementing an integrated polarity protection, the device can be used in a multiplexed configuration, simplifying the wiring of the application. Optimized to minimize the need for external components, can be used for light sensing applications ranging from a few millimeters to several meters.