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廬

APPLICATION BULLETIN

Mailing Address: PO Box 11400 鈥?Tucson, AZ 85734 鈥?Street Address: 6730 S. Tucson Blvd. 鈥?Tucson, AZ 85706

Tel: (602) 746-1111 鈥?Twx: 910-952-111 鈥?Telex: 066-6491 鈥?FAX (602) 889-1510 鈥?Immediate Product Info: (800) 548-6132

IMPLEMENTATION AND APPLICATIONS OF

CURRENT SOURCES AND CURRENT RECEIVERS

This application guide is intended as a source book for the

design and application of:

q

q

q

q

q

q

Current sources

Current sinks

Floating current sources

Voltage-to-current converters

(transconductance amplifiers)

Current-to-current converters (current mirrors)

Current-to-voltage converters

(transimpedance amplifiers)

This is not an exhaustive collection of circuits, but a com-

pendium of preferred ones. Where appropriate, suggested

part numbers and component values are given. Where added

components may be needed for stability, they are shown.

Experienced designers may elect to omit these components

in some applications, but less seasoned practitioners will be

able to put together a working circuit free from the frustra-

tion of how to make it stable.

The applications shown are intended to inspire the imagina-

tion of designers who will move beyond the scope of this

work.

R. Mark Stitt (602) 746-7445

CONTENTS

DEAD BAND CIRCUITS USING CURRENT REFERENCE ....... 14

DESIGN OF FIXED CURRENT SOURCES

REF200 IC CURRENT SOURCE

DESCRIPTION PIN STRAPPING REF200 FOR 50

碌

A鈥?00

碌

A .. 2

RESISTOR PROGRAMMABLE CURRENT SOURCES

AND SINKS USING REF200 AND ONE EXTERNAL OP AMP:

Current Source or Sink With Compliance to

Power Supply Rail and Current Out >100

碌

A .......................... 4

Current Source or Sink With Any Current Out ...................... 5

Floating Current Source With Current Out >100

碌

A ............... 5

Current Sources made with Voltage References ................... 5

Current Sources and Sinks and Current Mirrors

Using an Amplifier and a Series Pass Element .................... 6

Floating Current Source With

Current Out >100

碌

A and No Separate Power Supply ........... 6

CASCODING CURRENT SOURCES

FOR IMPROVED OUTPUT IMPEDANCE,

HIGH FREQUENCY PERFORMANCE,

AND HIGH VOLTAGE COMPLIANCE:

Cascoding with FETs ................................................................ 8

200

碌

A Floating Cascoded Current Source Using REF200 ... 9

300

碌

A Floating Cascoded Current Source Using REF200 . 10

400

碌

A Floating Cascoded Current Source Using REF200 . 10

NOISE REDUCTION OF CURRENT SOURCES ........................ 10

BIDIRECTIONAL CURRENT SOURCES .................................... 16

LIMITING CIRCUITS USING

BIDIRECTIONAL CURRENT SOURCES .................................... 16

PRECISION TRIANGLE WAVEFORM GENERATOR

USING BIDIRECTIONAL CURRENT SOURCES ....................... 17

DUTY CYCLE MODULATOR USING

BIDIRECTIONAL CURRENT SOURCES .................................... 17

SLEW RATE LIMITER ................................................................ 18

SINGLE SUPPLY INSTRUMENTATION AMPLIFIER ................ 18

VOLTAGE CONTROLLED CURRENT SOURCES

VOLTAGE CONTROLLED

CURRENT SOURCE USING INA105 .......................................... 18

VOLTAGE CONTROLLED CURRENT SOURCE WITH

INSTRUMENTATION AMPLIFIER INPUT鈥擳HE XTR101 ......... 20

SINGLE SUPPLY VOLTAGE

CONTROLLED CURRENT SOURCE鈥擳HE XTR110 ................ 20

CURRENT-TO-VOLTAGE

CONVERTERS, AND CURRENT RECEIVERS

CURRENT RECEIVER WITH COMPLIANCE TO

BOTH POWER SUPPLY RAILS USING THE INA105 ............. 22

POWER AMP LOAD CURRENT

MONITORING USING THE INA105 OR THE INA117 ............... 22

4 to 20mA CURRENT LOOP RECEIVER

WITH 0 to 5V OUTPUT USES THE RCV420 ............................. 23

VIRTUAL GROUND CURRENT

TO VOLTAGE CONVERTER ....................................................... 23

PHOTODIODE AMPLIFIERS ....................................................... 23

APPLICATIONS OF FIXED CURRENT SOURCES

VOLTAGE REFERENCES USING CURRENT SOURCES ........ 11

OP AMP OFFSET

ADJUSTMENT USING 5mV REFERENCE ................................. 12

WINDOW COMPARATOR USING

FLOATING VOLTAGE REFERENCE .......................................... 13

RTD EXCITATION USING CURRENT REFERENCE ................. 13

GLOSSARY .............................................................

27

漏

1989 Burr-Brown Corporation

AB165

Printed in U.S.A. March, 1990

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