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