The AD654JR is an integrated circuit (IC) voltage-to-frequency converter. It is designed to convert a variable voltage input signal into a corresponding frequency output signal. The device uses an on-chip voltage-controlled oscillator (VCO) to generate a frequency that is proportional to the input voltage. This makes it suitable for various applications such as frequency measurement, voltage-to-frequency conversion, and waveform generation. The AD654JR is housed in an 8-pin package and operates over a wide temperature range.