ADVFC32SH【PDF 1/6 页】IC CONV V/F F/V MONO TO100-10

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Sheet目录38

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REV.B

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.

ADVFC32

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

Tel: 781/329-4700 World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

?Analog Devices, Inc., 2000

Voltage-to-Frequency and

Frequency-to-Voltage Converter

FEATURES

High Linearity

0.01% Max at 10 kHz FS

0.05% Max at 100 kHz FS

0.2% Max at 500 kHz FS

Output TTL/CMOS-Compatible

V/F or F/V Conversion

6 Decade Dynamic Range

Voltage or Current Input

Reliable Monolithic Construction

MIL-STD-883-Compliant Versions Available

PIN CONFIGURATION

(TOP VIEW)

N-14 Package

H-10A Package

PRODUCT DESCRIPTION

The industry standard ADVFC32 is a low cost monolithic

voltage-to-frequency (V/F) converter or frequency-to-voltage

(F/V) converter with good linearity (0.01% max error at 10kHz)

and operating frequency up to 0.5 MHz. In the V/F configuration,

positive or negative input voltages or currents can be converted

to a proportional frequency using only a few external compo-

nents. For F/V conversion, the same components are used with

a simple biasing network to accommodate a wide range of input

logic levels.

TTL or CMOS compatibility is achieved in the V/F operating

mode using an open collector frequency output. The pull-up

resistor can be connected to voltages up to 30 volts, or to 15 V

or 5 V for conventional CMOS or TTL logic levels. This resis-

tor should be chosen to limit current through the open collector

output to 8 mA. A larger resistance can be used if driving a high

impedance load.

Input offset drift is only 3ppm of full scale per 癈, and full-

scale calibration drift is held to a maximum of 100 ppm/癈

(ADVFC32BH) due to a low T.C. Zener diode.

The ADVFC32 is available in commercial, industrial, and

extended temperature grades. The commercial grade is pack-

aged in a 14-lead plastic DIP while the two wider temperature

range parts are packaged in hermetically sealed 10-lead cans.

PRODUCT HIGHLIGHTS

1. The ADVFC32 uses a charge balancing circuit technique

(see Functional Block Diagram) which is well suited to high

accuracy voltage-to-frequency conversion. The full-scale

operating frequency is determined by only one precision

resistor and capacitor. The tolerance of other support compo-

nents (including the integration capacitor) is not critical.

Inexpensive ?0% resistors and capacitors can be used with-

out affecting linearity or temperature drift.

2. The ADVFC32 is easily configured to satisfy a wide range of

system requirements. Input voltage scaling is set by selecting

the input resistor which sets the input current to 0.25 mA at

the maximum input voltage.

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

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

network and reconfiguring the ADVFC32.

4. The ADVFC32 is intended as a pin-for-pin replacement for

VFC32 devices from other manufacturers.

5. The ADVFC32 is available in versions compliant with MIL-

STD-883. Refer to the Analog Devices Military Products

Databook or current ADVFC32/883B data sheet for detailed

specifications.

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