DUAL EPAD™ OPERATIONAL AMPLIFIER

ALD2722E/ALD2722

GENERAL DESCRIPTION

The ALD2722E/ALD2722 is a dual monolithic rail-to-rail precision CMOS

operational amplifier with integrated user programmable EPAD (Electri-

cally Programmable Analog Device) based offset voltage adjustment. The

ALD2722E/ALD2722 is a dual version of the ALD1722E/ALD1722 opera-

tional amplifier. Each ALD2722E/ALD2722 operational amplifier features

individual, user-programmable offset voltage trimming resulting in signifi-

cantly enhanced total system performance and user flexibility.

EPAD

technology is an exclusive ALD design which has been refined for analog

applications where precision voltage trimming is necessary to achieve a

desired performance. It utilizes CMOS FETs as in-circuit elements for

trimming of offset voltage bias characteristics with the aid of a personal

computer under software control. Once programmed, the set parameters

are stored indefinitely. EPAD offers the circuit designer a convenient and

cost-effective trimming solution for achieving the very highest amplifier/

system performance.

The ALD2722E/ALD2722 dual operational amplifier features rail-to-rail

input and output voltage ranges, tolerance to overvoltage input spikes of

300mV beyond supply rails, high capacitive loading up to 4000pF, ex-

tremely low input currents of 0.01pA typical, high open loop voltage gain,

useful bandwidth of 1.5MHz, slew rate of 1.9V/

µs, and low typical supply

current of 2mA for both amplifiers.

KEY FEATURES

•

5V single supply operation

•

EPAD ( Electrically Programmable Analog Device)

•

•

Computer-assisted trimming

•

Rail-to-rail input/output

•

Compatible with standard EPAD Programmer

•

High precision through in-system circuit trimming

•

•

System level “calibration” capability

•

Application Specific Programming mode

•

In-System Programming mode

•

Electrically programmable to compensate for

external component tolerances

•

Achieves 0.01pA input bias current and 25

input offset voltage

APPLICATIONS

• Sensor interface circuits

• Transducer biasing circuits

• Capacitive and charge integration circuits

• Biochemical probe interface

• Signal conditioning

• Portable instruments

• High source impedance electrode

amplifiers

• Precision Sample and Hold amplifiers

• Precision current to voltage converter

• Error correction circuits

• Sensor compensation circuits

• Precision gain amplifiers

• Periodic In-system calibration

• System output level shifter

PIN CONFIGURATION

ORDERING INFORMATION

Operating Temperature Range

-55

°C to +125°C0°C to +70°C0°C to +70°C

14-Pin

14-Pin

14-Pin

CERDIP

Small Outline

Plastic Dip

Package

Package (SOIC)

Package

ALD2722E DB

ALD2722E SB

ALD2722E PB

ALD2722 DB

ALD2722 SB

ALD2722 PB

* Contact factory for industrial temperature range

BENEFITS

•

Eliminates manual and elaborate

system trimming procedures

•

Remote controlled automated trimming

•

In-System Programming capability

•

No external components

•

No internal clocking noise source

•

Simple and cost effective

•

Small package size

•

Extremely small total functional

volume size

•

Low system implementation cost

•

Micropower

1

2

3

4

5

6

7

11

12

13

14

8

9

10

TOP VIEW

DB, PB, SB PACKAGE

VE 2A

VE 1A

V-

N/C

VE 2B

VE 1B

OUT B

OUT A

+IN A

-IN A

+IN B

-IN B

N/C

V+

© 1998 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, California 94089 -1706 Tel: (408) 747-1155 Fax: (408) 747-1286 http://www.aldinc.com