Rev 2.1 ©2011 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286

www.aldinc.com

GENERAL DESCRIPTION

The ALD2721E/ALD2721 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

ALD2721E/ALD2721 is a dual version of the ALD1721E/ALD2721 opera-

tional amplifier. Each ALD2721E/ALD2721 operational amplifier features

individual user-programming 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 within the device even after power-down. EPAD

offers the circuit designer a convenient and cost-effective trimming solution

for achieving the very highest amplifier/system performance.

The ALD2721E/ALD2721 dual operational amplifier features rail-to-rail

input and output voltage ranges, tolerance to over-voltage input spikes of

300mV beyond supply rails, capacitive loading up to 50pF, extremely low

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

bandwidth of 700KHz, slew rate of 0.7V/

µs, and low typical supply current

of 200

µA for both amplifiers.

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 and Low 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

KEY FEATURES

•

EPAD (Electrically Programmable Analog Device)

•

•

Computer-assisted trimming

•

Rail-to-rail input/output

•

Compatible with standard EPAD Programmer

•

•

High precision through in-system circuit precision 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 35

voltage simultaneously

•

Low voltage operation

1

2

3

4

5

6

7

11

12

13

14

8

9

10

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+

PIN CONFIGURATION

TOP VIEW

SB, PB, DB PACKAGES

* N/C Pins are internally connected. Do not connect externally.

ORDERING INFORMATION

Operating Temperature Range

0

°C to +70°C0°C to +70°C

-55

°C to +125°C

14-Pin

14-Pin

14-Pin

Small Outline

Plastic Dip

CERDIP

Package (SOIC)

Package

Package

ALD2721ESB

ALD2721EPB

ALD2721EDB

ALD2721SB

ALD2721PB

ALD2721DB

* Contact factory for high temperature versions.

TM

®

N

A

B

L

E

D

E

DUAL EPAD® MICROPOWER CMOS OPERATIONAL AMPLIFIER

ALD2721E/ALD2721