AS

“АLFA RPAR”

Joint Stock Company ALFA

Riga, Latvia www.alfarzpp.lv; alfa@alfarzpp.lv

2018 v.1

1

AS3280

AS3280A

AS3280

– Dual Operational Transconductance Amplifier (OTA)

Features

Applications

• Low Initial Input Offset Voltage: 500 µV (Max) (AS3280A)

• Low Offset Voltage Drift: 5µV/°C (Max) (AS3280A)

• Excellent Matching of the Two Amplifiers for All

Characteristics

• Internal Current-Driven Linearizing Diodes Reduce the

External Input Current to an Offset Component

• Flexible Supply Voltage Range

±2V to ±15V

AS3280D, AS3280AD

SOIC-16 150mil, 1.27 mm

• • Voltage Controlled Amplifiers Oscillators

• Multipliers

• • Demodulators

• • Sample and Hold

• • Instrumentation Amplifiers

• • Function Generators

• • Triangle Wave-to-Sine Wave Converters

• • Comparators

• • Audio Preamplifier

General Description

The AS3280 and AS3280A 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. Careful design of critical places of

the circuit reduces the amplifier dependence upon thermal and processing variables.

The AS3280 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 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.

Pin Information

Pinout Top view

SOIC-16

Pin No

Pin

Name

Description

1

Input current with

linearizing diode 1

2

Emitter 1

3

Amplifier bias

current 1

4

Negative supply

5

NC

Not connect

6

Amplifier bias

current 2

7

Emitter 2

8

Input current with

linearizing diode 2

9

+IN2

Noninverting input1

10

-IN2

Inverting input 2

11

Positive supply 2

12

OUT2

Output 2

13

OUT1

Output 1

14

Positive supply 1

15

-IN1

Inverting input 1

16

+IN1

Noninverting input1

2

1

3

4

5

6

7

12

11

10

9

8

13

14

15

-IN1

OUT1

OUT2

+IN2

-IN2

-

EE

V

NC

A2

A1

Functional diagram of AS3280

1/2 AS3280

16

10

15

9

11

14

12

2

7

13

4

3 6

1

8

2K

2K