Monolithic Synchronous Voltage-to-Frequency Converter

The AD654 is a monolithic V/F converter consisting of an input Amplifier a precision Oscillator system, and a high current output stage. A single RC network is all that is required to set up any full scale (FS) frequency up to 500 kHz and any FS input voltage up to 30 V. Linearity error is only 0. 03% for a 250 kHz FS, and operation is guaranteed o

ver an 80 dB dynamic range. The overall temperature coefficient (excluding the effects of external components) is typically 50 ppm/C. The AD654 operates from a single supply of 5 V to 36 V and consumes only 2. 0 mA quiescent current. The low drift (4 V/C typ) input Amplifier allows operation directly from small signals such as thermocouples or strain gauges while offering a high (250 M(ohm) input resistance. Unlike most V/F converters, the AD654 provides a square-wave output, and CAN drive up to 12 TTL loads, Optocouplers long cables, or similar loads.

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