ALD1722E/ALD1722

Advanced Linear Devices

1

EPAD™ OPERATIONAL AMPLIFIER

ALD1722E/ALD1722

GENERAL DESCRIPTION

The ALD1722E/ALD1722 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

ALD1722E/ALD1722 is a direct replacement of the ALD1702 operational

amplifier, with the added feature of user-programmable 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 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 pro-

grammed, 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 ALD1722E/ALD1722 operational amplifier features rail-to-rail input

and output voltage ranges, tolerance to over-voltage 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 1.5 MHz, slew rate of 2.1 V/

µs, and low supply current

of 0.8mA.

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

• Low power

* Contact factory for industrial temperature range

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

ALD1722E DA

ALD1722E SA

ALD1722E PA

ALD1722 DA

ALD1722 SA

ALD1722 PA

ORDERING INFORMATION

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+

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-situ circuit precision trimming

• System level “calibration” capability

• In-System Programming capable

• Electrically programmable to compensate for external

component tolerances

• Achieve 0.01pA input bias current and 25

input offset voltage simultaneously

• Compatible with industry standard pinout