AD650SD/883B

IC,Voltage-to-Frequency Converter,BIPOLAR,DIP,14Pin

Product Details

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 allows 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 for the commercial 0°C to +70°C temperature range. For industrial temperature range -25°C to +85°C applications, the AD650AD and AD650BD are offered in a ceramic package. The AD650SD is specified for the full -55°C to +125°C extended temperature range.

### Features and Benefits

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V/F Conversion to 1 MHz

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Reliable Monolithic Construction

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Very Low Nonlinearity

\- 0.002% typ at 10 kHz

\- 0.005% typ at 100 kHz

\- 0.07% typ at 1 MHz

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Input Offset Trimmable to Zero

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CMOS or TTL Compatible

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Unipolar, Bipolar or Differential V/F

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V/F or F/V Conversion

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Available in Surface Mount

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MIL-STD-883 Compliant Versions Available