AD654JN - Voltage to Frequency Converter VFC Non-Sync 500kHz 8-Pin PDIP (3 Piece Lot)

Description

• 8-lead mini-DIP the AD654 is a complete V/F converter requiring only an RC timing network to set the desired full-scale frequency and a selectable pull-up resistor for the open-collector output stage. Any full scale input voltage range from 100 mV to 10 volts (or greater, depending on +VS) can be accommodated by proper selection of the timing resistor. The fullscale frequency is then set by the timing capacitor from the simple relationship, f = V/10 RC.
• A minimum number of low cost external components are necessary. A single RC network is all that is required to set up any full scale frequency up to 500 kHz and any full-scale input voltage up to 30 V.
• Power supply requirements are minimal; only 2.0 mA of quiescent current is drawn from the single positive supply from 4.5 volts to 36 volts. In this mode, positive inputs can vary from 0 volts (ground) to (+VS 4) volts. Negative inputs can easily be connected for below ground operation.
• The versatile open-collector output stage can sink more than 10 mA with a saturation voltage less than 0.4 volts. The Logic Common terminal can be connected to any level between ground (or VS) and 4 volts below +VS. This allows easy direct interface to any logic family with either positive or negative logic levels.
• Perfect for breadboard, DIY, maker, repair, prototype.

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 V/C typ) input amplifier allows operation directly from small signals such as thermocouples or strain gauges while offering a high (250 M) 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

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