AD654JR Analog Devices Inc, AD654JR Datasheet

AD654JR

Manufacturer Part Number

AD654JR

Description

IC V-F CONVERTER MONO 8-SOIC

Manufacturer

Analog Devices Inc

Type

Voltage to Frequencyr

Datasheet

1.AD654JRZ-REEL.pdf (11 pages)

Specifications of AD654JR

Rohs Status

RoHS non-compliant

Frequency - Max

500kHz

Full Scale

±50ppm/°C

Linearity

±0.2%

Mounting Type

Surface Mount

Package / Case

8-SOIC (0.154", 3.90mm Width)

Converter Function

VFC

Full Scale Frequency

500

Power Supply Requirement

Single/Dual

Single Supply Voltage (typ)

5/9/12/15/18/24/28V

Single Supply Voltage (max)

36V

Single Supply Voltage (min)

4.5V

Dual Supply Voltage (typ)

±9/±12/±15V

Dual Supply Voltage (min)

±5V

Dual Supply Voltage (max)

±18V

Operating Temperature (min)

-40C

Operating Temperature (max)

85C

Operating Temperature Classification

Industrial

Package Type

SOIC N

Lead Free Status / Rohs Status

Not Compliant

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PRODUCT DESCRIPTION

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 quies-

cent 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.

PRODUCT HIGHLIGHTS

1. Packaged in both an 8-lead mini-DIP and an 8-lead SOIC

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.

FEATURES

Low Cost

Single or Dual Supply, 5 V to 36 V,

Full-Scale Frequency Up to 500 kHz

Minimum Number of External Components Needed

Versatile Input Amplifier

Low Power: 2.0 mA Quiescent Current

Low Offset: 1 mV

package, the AD654 is a complete V/F converter requiring

only an RC timing network to set the desired full-scale fre-

quency 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 +V

dated by proper selection of the timing resistor. The full-

scale frequency is then set by the timing capacitor from the

simple relationship, f = V/10 RC.

Positive or Negative Voltage Modes

Negative Current Mode

High Input Impedance, Low Drift

5 V to

) can be accommo-

18 V

Voltage-to-Frequency Converter

2. A minimum number of low cost external components are

3. Plastic packaging allows low cost implementation of the

4. Power supply requirements are minimal; only 2.0 mA of

5. The versatile open-collector output stage can sink more than

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

Tel: 781/329-4700

Fax: 781/326-8703

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.

standard VFC applications: A/D conversion, isolated signal

transmission, F/V conversion, phase-locked loops, and tuning

switched-capacitor filters.

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 (+V

can easily be connected for below ground operation.

10 mA with a saturation voltage less than 0.4 volts. The Logic

Common terminal can be connected to any level between

ground (or –V

direct interface to any logic family with either positive or

negative logic levels.

FUNCTIONAL BLOCK DIAGRAM

OUT

) and 4 volts below +V

DRIVER

World Wide Web Site: http://www.analog.com

Low Cost Monolithic

COMMON

LOGIC

AD654

OSC

–4) volts. Negative inputs

. This allows easy

–V

AD654

Related parts for AD654JR

AD654JR Summary of contents

Page 1

FEATURES Low Cost Single or Dual Supply 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 ...

Page 2

AD654–SPECIFICATIONS Model CURRENT-TO-FREQUENCY CONVERTER Frequency Range 1 Nonlinearity f = 250 kHz MAX f = 500 kHz MAX Full-Scale Calibration Error C = 390 pF 1.000 mA IN vs. Supply (f 250 kHz) MAX V = +4.75 V ...

Page 3

... Maximum Output Current Instantaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA Sustained . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 mA Logic Common to – –500 mV to (+V S Storage Temperature Range . . . . . . . . . . . . . – +150 C Model Temperature Range AD654JN – +85 C AD654JR – +85 C REV –4) S ORDERING GUIDE Package Description 8-Lead Plastic DIP 8-Lead SOIC –3– AD654 ...

Page 4

AD654 CIRCUIT OPERATION The AD654’s block diagram appears in Figure 1. A versatile operational amplifier serves as the input stage; its purpose is to convert and scale the input voltage signal to a drive current in the NPN follower. Optimum ...

Page 5

C AD654 R COMP Figure 3b. Bias Current Compensation—Negative Inputs If the AD654’ offset voltage must be trimmed, the trim must be performed external to the device. Figure 3c shows an optional connection ...

Page 6

AD654 and insure the supply, source and load are appropriate. If provision is made to trim offset, begin by setting the input to 1/10,000 of full scale. Adjust the offset pot until the output is 1/10,000 of full scale (for ...

Page 7

AD589 – AD592 1 A/k Figure 8. Two-Wire Temperature-to-Frequency Converter TWO-WIRE TEMPERATURE-TO-FREQUENCY CONVERSION Figure 8 shows the AD654 in a two-wire temperature-to-frequency conversion scheme. The twisted pair transmission line serves the dual purpose of supplying power to the device ...

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AD654JR Analog Devices Inc, AD654JR Datasheet

AD654JR

Specifications of AD654JR

Available stocks

Related parts for AD654JR

AD654JR Summary of contents

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