©2014 Advanced Linear Devices, Inc., Vers. 2.0

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EPAD

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®

N A

B L

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PRECISION MICROPOWER CMOS OPERATIONAL AMPLIFIER

ALD1731A/ALD1731

GENERAL DESCRIPTION

The ALD1731A/ALD1731 is a precision, low cost, monolithic CMOS

micropower high slew rate operational amplifier intended for a broad

range of analog applications using ±1V to ±5V dual power supply

systems, as well as +2V to +10V battery operated systems. All device

characteristics are specified for +5V single supply or ±2.5V dual supply

systems. Supply current is 250µA maximum at 5V supply voltage. It is

manufactured with Advanced Linear Devices' enhanced EPAD® silicon

gate CMOS process.

The ALD1731A/ALD1731 features extremely low input power require-

ments, practically removing any loading effects on high source imped-

ance signal sources such as cpacitive sensors. These devices do not add

any significant errors, regardless of what the souce impedance variations

may be, thereby improving overall system precision and accuracy. The

device is designed to offer the benefits of CMOS technology by providing

a wide range of desired specifications. The most important of these

specifications is extremely low input bias/offset currents at extremely low

input offset voltages. It has been developed specifically for the +5V single

supply or ±1V to ±5V dual supply user and offers the popular industry

standard pin configuration of µA741 and ICL7611 types.

Several additional important characteristics of the device make applica-

tion easier to implement at those voltages. First, the operational amplifier

can operate with rail to rail input and output voltages. This means the

signal input voltage and output voltage can be equal to the positive and

negative supply voltages. This feature allows numerous analog serial

stages and flexibility in input signal bias levels. Second, the device was

designed to accommodate mixed applications where digital and analog

circuits may operate off the same power supply or battery. Third, the

output stage can typically drive up to 50pF capacitive and 10KΩ resistive

loads.

These features, combined with extremely low input currents, high open

loop voltage gain of 100V/mV, useful bandwidth of 700KHz, a slew rate

of 0.7V/µs, low power dissipation of 0.5mW, low offset voltage and

temperature drift, make the ALD1731A/ALD1731 a versatile, micropower

operational amplifier.

The ALD1731A/ALD1731, designed and fabricated with silicon gate

CMOS technology, offers 0.01pA typical input bias current. On chip offset

voltage trimming, using EPAD technology, allows the device to be used

without nulling. Additionally, robust design and rigorous screening make

this device especially suitable for operation in temperature-extreme

environments and rugged conditions.

FEATURES & BENEFITS

• Extremely low input offset voltages --

35µV typical

• Extremely low input bias currents --

0.01pA typical

• All parameters specified for +5V single

supply or ±2.5V dual supply systems

• Rail to rail input and output voltage ranges

• No frequency compensation required --

unity gain stable

• Ideal for high source impedance applications

• Dual power supplies ±1.0V to ±5.0V

• Single power supply +2.0V to +10.0V

• High voltage gain -- typically 100V/mV

@ ±2.5V(100dB)

• Drive as low as 10KΩ load

• Output short circuit protected

• Unity gain bandwidth of 0.7MHz

• Slew rate of 0.7V/µs

• Micropower dissipation

• Suitable for rugged, temperature-extreme

environments

APPLICATIONS

• Voltage amplifier

• Voltage follower/buffer

• Charge integrator

• Photodiode amplifier

• Data acquisition systems

• High performance portable instruments

• Signal conditioning circuits

• Sensor and transducer amplifiers

• Low leakage amplifiers

• Active filters

• Sample/Hold amplifier

• Picoammeter

• Current to voltage converter

Operating Temperature Range

0°C to +70°C0°C to +70°C

-55°C to +125°C

8-Pin

8-Pin

8-Pin

Small Outline

Plastic Dip

CERDIP

Package (SOIC)

Package

Package

ALD1731ASAL

ALD1731APAL

ALD1731SAL

ALD1731PAL

ALD1731ASA

ALD1731ADA

ALD1731SA

ALD1731DA

* Contact factory for leaded (non-RoHS) or high temperature versions.

ORDERING INFORMATION (“L” suffix denotes lead-free (RoHS))

PIN CONFIGURATION

* I/C pins are internally connected. Do not connect externally.

TOP VIEW

SAL, PAL, SA, DA PACKAGES

1

2

2

3

4

8

7

6

5

I/C

-IN

+IN

I/C

OUT

N/C

V-

V+