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AD650KP

Voltage-to-Frequency and Frequency-to-Voltage Converter

Analog Devices 

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FEATURES

V/F Conversion to 1 MHz

Reliable Monolithic Construction

Very Low Nonlinearity

0.002% typ at 10 kHz

0.005% typ at 100 kHz

0.07% typ at 1 MHz

Input Offset Trimmable to Zero

CMOS or TTL Compatible

Unipolar, Bipolar, or Differential V/F

V/F or F/V Conversion

Available in Surface Mount

MIL-STD-883 Compliant Versions Available

Voltage-to-Frequency and

Frequency-to-Voltage Converter

AD650

PIN CONFIGURATION

PRODUCT DESCRIPTION

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 volt-

age and current formats to be used, and an open-collector out-

put 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 con-

versions. 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 control-

lers. 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.

PRODUCT HIGHLIGHTS

1. In addition to very high linearity, the AD650 can operate at

full-scale output frequency up to 1 MHz. The combination of

these two features makes the AD650 an inexpensive solution

for applications requiring high resolution monotonic A/D

conversion.

2. The AD650 has a very versatile architecture that can be con-

figured to accommodate bipolar, unipolar, or differential in-

put voltages, or unipolar input currents.

3. TTL or CMOS compatibility is achieved using an open col-

lector frequency output. The pull-up resistor can be con-

nected to voltages up to +30 V, or +15 V or +5 V for

conventional CMOS or TTL logic levels.

4. The same components used for V/F conversion can also be

used for F/V conversion by adding a simple logic biasing net-

work and reconfiguring the AD650.

5. The AD650 provides separate analog and digital grounds.

This feature allows prevention of ground loops in real-world

applications.

6. The AD650 is available in versions compliant with MIL-

STD-883. Refer to the Analog Devices Military Products

Databook or current AD650/883B data sheet for detailed

specifications.

REV. A

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703

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