Integrated Circuit Voltage-to-Frequency Converter

The AD650 V/F/V (voltage-to-frequency or frequency-to-voltage converter) provides a combination of high frequency operation and low nonlinearity previously unavailable in monolithic form. The inherent monotonicity of the V/F transfer function makes the AD650 useful as a high-resolution Analog-to-digital converter. A flexible input configuration al

lows a wide variety of input voltage and current formats to be used, and an open-collector output with separate digital ground allows simple interfacing to either standard Logic families or opto-couplers. The linearity error of the AD650 is typically 20 ppm (0. 002% of full scale) and 50 ppm (0. 005%) maximum at 10 kHz full scale. This corresponds to approximately 14-bit linearity in an Analog-to-digital converter circuit. Higher full-scale frequencies or longer count intervals CAN be used for higher resolution conversions. The AD650 has a useful dynamic range of six decades allowing extremely high resolution measurements. Even at 1 MHz full scale, linearity is guaranteed less than 1000 ppm (0. 1%) on the AD650KN KP, BD and SD grades. In addition to Analog-to-digital conversion, the AD650 CAN be used in isolated Analog signal transmission applications, phased locked-loop circuits, and precision stepper motor speed controllers. In the F/V mode, the AD650 CAN be used in precision tachometer and FM Demodulator circuits. The input signal range and full-scale output frequency are user-programmable with two external capacitors and one resistor. Input offset voltage CAN be trimmed to zero with an external potentiometer. The AD650JN and AD650KN are offered in a plastic 14-pin DIP package. The AD650JP and AD650KP are available in a 20-pin plastic leaded chip Carrier (PLCC). Both plastic packaged versions of the AD650 are specified...

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