CA3280A Intersil Corporation, CA3280A Datasheet

CA3280A

Manufacturer Part Number

CA3280A

Description

Dual 9MHz Operational Transconductance Amplifier (OTA)

Manufacturer

Intersil Corporation

Datasheet

1.CA3280A.pdf (10 pages)

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Dual, 9MHz, Operational

Transconductance Amplifier (OTA)

The CA3280 and CA3280A types consist of two variable

operational amplifiers that are designed to substantially reduce

the initial input offset voltage and the offset voltage variation

with respect to changes in programming current. This design

results in reduced “AGC thump,” an objectionable characteristic

of many AGC systems. Interdigitation, or crosscoupling, of

critical portions of the circuit reduces the amplifier dependence

upon thermal and processing variables.

The CA3280 has all the generic characteristics of an

operational voltage amplifier except that the forward transfer

characteristics is best described by transconductance rather

than voltage gain, and the output is current, not voltage. The

magnitude of the output current is equal to the product of

transconductance and the input voltage. This type of

operational transconductance amplifier was first introduced in

1969, and it has since gained wide acceptance as a gateable,

gain controlled building block for instrumentation and audio

applications, such as linearization of transducer outputs,

standardization of widely changing signals for data processing,

multiplexing, instrumentation amplifiers operating from the

nanopower range to high current and high speed comparators.

For additional application information on this device and on

OTAs in general, please refer to Application Notes: AN6818,

AN6668, and AN6077.

Pinout

Ordering Information

CA3280AE

CA3280E

PART NUMBER

EMITTER, A1

EMITTER, A2

ABC

, A1

, A2

V-

RANGE (

-55 to 125

TEMP.

0 to 70

CA3280 (PDIP)

TOP VIEW

16 Ld PDIP

Data Sheet

PACKAGE

+IN, A1

-IN, A1

V+, A1

OUT, A1

OUT, A2

V+, A2

-IN, A2

+IN, A2

E16.3

PKG.

NO.

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

Features

• Low Initial Input Offset Voltage: 500µV (Max) (CA3280A)

• Low Offset Voltage Change vs I

• Low Offset Voltage Drift: 5µV/

• Excellent Matching of the Two Amplifiers for All

• Internal Current-Driven Linearizing Diodes Reduce the

• Flexible Supply Voltage Range . . . . . . . . . . ±2V to ±15V

Applications

• Voltage Controlled Amplifiers

• Voltage Controlled Oscillators

• Multipliers

• Demodulators

• Sample and Hold

• Instrumentation Amplifiers

• Function Generators

• Triangle Wave-to-Sine Wave Converters

• Comparators

• Audio Preamplifier

Functional Diagram

1/2 CA3280

for All Types

Characteristics

External Input Current to an Offset Component

May 2002

Intersil (and design) is a trademark of Intersil Americas Inc.

CA3280, CA3280A

C (Max) (CA3280A)

ABC

: <500µV (Typ)

FN1174.6

Related parts for CA3280A

CA3280A Summary of contents

Page 1

... Data Sheet Dual, 9MHz, Operational Transconductance Amplifier (OTA) The CA3280 and CA3280A types consist of two variable operational amplifiers that are designed to substantially reduce the initial input offset voltage and the offset voltage variation with respect to changes in programming current. This design results in reduced “ ...

Page 2

... Operating Conditions Temperature Range CA3280 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 CA3280A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 Supply Voltage Range (Typ ±2V to ±15V CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. ...

Page 3

... R = 100Ω T ABC 1mA ABC 100µA Input I ABC C Output 100µA O ABC = ±15V, Unless Otherwise Specified (Continued) CA3280 CA3280A TYP MAX MIN TYP 410 650 350 410 -410 -650 -350 -410 3 4 4.1 -4 -4.1 450 550 350 ...

Page 4

Test Circuits and Waveforms 30V 1/2 CA3280 TEST + POINT 16 3 FIGURE 1. LEAKAGE CURRENT TEST CIRCUIT 14 10kΩ 16 1/2 CA3280 10kΩ ABC I DIODE FIGURE 3A. EFFECTS OF DIODE ...

Page 5

Application Information Figures 4 and 5 show the equivalent circuits for the current source and linearization diodes in the CA3280. The current through the linearization network is approximately equal to the programming current. There are several advantages to driving these ...

Page 6

CA3280 33pF - 51Ω 15 2kΩ 1/2 CA3280 33pF - 51Ω 3.6kΩ 1/2 200Ω CA3280 - 15 200Ω 3 910kΩ 100kΩ V+ ...

Page 7

Typical Performance Curves 3mA ABC 300µA ABC 30µA ABC 3.0µA ABC 0.3µA ABC 0.03µA ABC 0.1 1 ...

Page 8

Typical Performance Curves -75 -50 - TEMPERATURE ( FIGURE 17. LEAKAGE CURRENT vs TEMPERATURE ...

Page 9

Typical Performance Curves ±15V 125 - AMPLIFIER BIAS ...

Page 10

... Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use ...

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