The AD654JRZ-REEL is a precision voltage-to-frequency converter IC manufactured by Analog Devices. It is a monolithic, low power, analog-to-digital converter that is capable of converting an analog input voltage into a square wave output signal with a frequency directly proportional to the input voltage. The AD654JRZ-REEL is commonly used in a wide range of applications, including frequency measurement, waveform generation, signal conditioning, and digital data encoding. It operates from a single power supply voltage and can convert input voltages ranging from -100mV to +100mV. The IC is available in a small and compact 8-lead SOIC package.