Rev 2.0 ©2010 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286

www.aldinc.com

DUAL RAIL-TO-RAIL CMOS OPERATIONAL AMPLIFIER

ALD2704A/ALD2704B

ALD2704

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

ALD2704ASAL

ALD2704APAL

ALD2704ADA

ALD2704BSAL

ALD2704BPAL

ALD2704BDA

ALD2704SAL

ALD2704PAL

ALD2704DA

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

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

GENERAL DESCRIPTION

The ALD2704A/ALD2704B/ALD2704 is a dual monolithic operational

amplifier with MOSFET input that has rail-to-rail input and output voltage

ranges. The input voltage range and output voltage range are very close

to the positive and negative power supply voltages. Typically the input

voltage can be beyond positive power supply voltage V+ or the negative

power supply voltage V- by up to 300mV. The output voltage swings to

within 60mV of either positive or negative power supply voltages at rated

load.

With high impedance load, the output voltage of the ALD2704A/ALD2704B/

ALD2704 approaches within 1mV of the power supply rails. This device

is designed as an alternative to the popular J-FET input operational

amplifier in applications where lower operating voltages, such as 9V

battery or ±3.25V to ±5V power supplies are being used. The ALD2704A/

ALD2704B/ALD2704 offers high slew rate of 5V/µs. It is designed and

manufactured with Advanced Linear Devices' standard enhanced ACMOS

silicon gate CMOS process, and it offers low unit cost and exceptional

reliability.

The rail-to-rail input and output feature of the ALD2704A/ALD2704B/

ALD2704 expands signal voltage range for a given operating supply

voltage and allows numerous analog serial stages to be implemented

without losing operating voltage margin. The output stage is designed to

drive up to 10mA into 400pF capacitive and 1.5KΩ resistive loads at unity

gain and up to 4000pF at a gain of 5. Short circuit protection to either

ground or the power supply rails is at approximately 15mA clamp current.

Due to complementary output stage design, the output can source and

sink 10mA into a load with symmetrical drive and is ideally suited for

applications where push-pull voltage drive is desired.

For each of the operational amplifier, the offset voltage is trimmed on-chip

to eliminate the need for external nulling in many applications.

For

precision applications, the output is designed to settle to 0.1% in 2µs. In

large signal buffer applications, the operational amplifier can function as

an ultrahigh input impedance voltage follower /buffer that allows input and

output voltage swings from positive to negative supply voltages. This

feature is intended to greatly simplify systems design and eliminate higher

voltage power supplies in many applications. Additionally, robust design

and rigorous screening make this device especially suitable for operation

in temperature-extreme environments and rugged conditions.

FEATURES

• Rail-to-rail input and output voltage ranges

• Symmetrical push-pull output drives

• Output settles to 2mV of supply rails

• 5.0V/µs slew rate

• High capacitive load capability -- up to 4000pF

• No frequency compensation required -- unity

gain stable

• Extremely low input bias currents -- <1.0pA

typical (20pA max.)

• Ideal for high source impedance applications

• High voltage gain -- typically 100V/mV

• Output short circuit protected

• Unity gain bandwidth of 2.1MHz

• 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

• Low leakage amplifiers

• Active filters

• Sample/Hold amplifier

• Picoammeter

• Current to voltage converter

• Coaxial cable driver

• Capacitive sensor amplifier

• Piezoelectric transducer amplifier

PIN CONFIGURATION

TOP VIEW

SAL, PAL, DA PACKAGES

1

2

3

4

8

7

6

5

V+

V -