ALD1721E/ALD1721

PIN CONFIGURATION

1

2

2

3

4

8

7

6

5

TOP VIEW

DA, PA, SA PACKAGE

VE1

-IN

+IN

VE2

OUT

N/C

V-

V+

EPAD™ MICROPOWER OPERATIONAL AMPLIFIER

GENERAL DESCRIPTION

The

ALD1721E/ALD1721 is a monolithic rail-to-rail precision CMOS

operational amplifier with integrated user programmable EPAD (Electri-

cally Programmable Analog Device) based offset voltage adjustment. The

ALD1721E/ALD1721 operational amplifier is a direct replacement of the

ALD1701 operational amplifier, with the added feature of user-program-

mable offset voltage trimming resulting in significantly enhanced total

system performance and user flexibility. EPAD technology is an exclusive

ALD design which has been refined for analog applications where preci-

sion 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 ALD1721E/ALD1721 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 0.7 V/

µs, and low typical supply current

of 120 uA.

BENEFITS

• Eliminates manual and elaborate

system trimming procedures

• Remote controlled automated trimming

• In-System Programming capability

• No external components

• No internal chopper clocking noise

• No chopper dynamic power dissipation

• 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

input offset voltage simultaneously

•

Compatible with industry standard pinout

ORDERING INFORMATION

Operating Temperature Range

-55

°C to +125°C0°C to +70°C0°C to +70°C

8-Pin

8-Pin

8-Pin

CERDIP

Small Outline

Plastic Dip

Package

Package (SOIC)

Package

ALD1721E DA

ALD1721E SA

ALD1721E PA

ALD1721 DA

ALD1721 SA

ALD1721 PA

* Contact factory for industrial temperature range

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