Features: Low CostSingle or Dual Supply, 5 V to 36 V, 65 V to 618 VFull-Scale Frequency Up to 500 kHzMinimum Number of External Components NeededVersatile Input AmplifierPositive or Negative Voltage ModesNegative Current ModeHigh Input Impedance, Low DriftLow Power: 2.0 mA Quiescent CurrentLow Off...
AD654: Features: Low CostSingle or Dual Supply, 5 V to 36 V, 65 V to 618 VFull-Scale Frequency Up to 500 kHzMinimum Number of External Components NeededVersatile Input AmplifierPositive or Negative Voltage...
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Architecture | Non-Synchronous |
# Channels | 1-Single Ended |
Input Voltage Range (V) | ±14V |
Full Scale Fout (kHz) | 500kHz |
Accuracy (%/kHz) | 0.4 |
Voltage Supply (V) | +/- 5 to +/- 18 |
Supply Current | 2.5mA |
Package | 8-Lead PDIP,8-Lead SOIC |
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.