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AD654 IC – Voltage to Frequency Converter IC

469.64 Incl. Tax

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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.


• 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


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

* product image for illustration purposes only. actual product may vary.


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