The Analog Devices AD537SD is a Voltage to Frequency converter IC with a frequency range up to 100 kHz. It features a linearity of ±0.05% and operates with a quiescent current of 1.2 mA.
The Analog Devices AD537JD is a voltage-to-frequency converter IC with a 100 kHz frequency range and ±0.05% linearity. It is available in a 14-CDIP package for through-hole mounting.