AD654 IC - Voltage to Frequency Converter IC

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 over 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 µV/°C typ) input amplifier allows operation directly from small signals such as thermocouples or strain gauges while offering a high (250 MΩ) 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. Features:- • Low Cost • Single or Dual Supply, 5 V to 36 V, 65 V to 618 V • Full-Scale Frequency Up to 500 kHz • Minimum Number of External Components Needed • Versatile Input Amplifier -Positive or Negative Voltage Modes -Negative Current Mode -High Input Impedance, Low Drift • Low Power: 2.0 mA Quiescent Current • Low Offset: 1 mV Specification:- Parameter Specification Supply Voltage 36 V Maximum Input Voltage −300 mV to +VS Maximum Output Current: ±18 V Instantaneous 50 mA Sustained 25 mA Logic Common to −VS −500 mV to (+VS –4) Storage Temperature Range −65°C to +150°C Related Document:- AD654 IC Data Sheet