AD537JH (ANALOG DEVICES)

The AD537JH is a monolithic Voltage-to-frequency Converter consisting of an input amplifier, a precision oscillator system, an accurate internal reference generator and a high current output stage. Only a single external RC network is required to set up any full-scale (F.S.) frequency up to 100kHz and any F.S. input voltage up to ±30V. Linearity error is as low as ±0.05% for 10kHz F.S. and operation is guaranteed over an 80dB dynamic range. The overall temperature coefficient (excluding the effects of external components) is typically ±30ppm/°C. The AD537 operates from a single supply of 5 to 36V and consumes only 1.2mA quiescent current. A temperature-proportional output, scaled to 1.00mV/K, enables the circuit to be used as a reliable temperature-to-frequency converter; in combination with the fixed reference output of 1.00V, offset scales such as 0°C or 0°F can be generated.