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 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.
|Title||Content Type||File Type|
|AD654: Low Cost Monolithic Voltage-to-Frequency Converter Data Sheet (Rev B, 12/1999) (pdf, 180 kB)||Data Sheets|
|AN-361: Ask the Applications Engineer (V/F Converters) (pdf, 287 kB)||Application Notes|
|AN-276: Analog to Digital Conversion by Using V/F Converters (pdf, 646 kB)||Application Notes|
|AN-278: Operation and Applications of the AD654 IC V-to-F Converter (pdf, 3376 kB)||Application Notes|
Single-Supply Acceleration-to-Frequency Circuits
(Analog Dialogue, Vol. 29, No. 3, 1995)
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Ask The Applications Engineer-3
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