GENERAL DESCRIPTION

The ALD1712A/ALD1712B/ALD1712 is a monolithic precision operational

amplifier intended primarily for a wide range of analog applications

in +5V single power supply and ±5V dual power supply systems as well

as +5V to +10V battery operated systems. All device characteristics are

specified for +5V single supply or ±2.5V dual supply systems. It is

manufactured with Advanced Linear Devices' enhanced ACMOS silicon

gate CMOS process and is available as a standard cell in ALD's ASIC

Function-Specific library.

The ALD1712A/ALD1712B/ALD1712 has an input stage that operates to

+300mV above and -300mV below the supply voltages with no adverse

effects and/or phase reversals. It has been developed specifically with

the 5V single supply or ±2.5V dual supply user in mind.

Several important characteristics of the device make many applications

easy to implement for these supply voltages. First, the operational

amplifier can operate with rail-to-rail input and output voltages. This

feature allows numerous analog serial stages to be implemented without

losing operating voltage margin. Second, the device was designed to

accommodate mixed applications where digital and analog circuits may

work off the same 5V power supply. Third, the output stage can drive up

to 400pF capacitive, and 1KΩ resistive loads in non-inverting unity gain

connection, and up to 4000pF at a gain of 5. These features, coupled with

extremely low input currents, high voltage gain, useful bandwidth of

1.5MHz, slew rate of 2.1V/μs, low power dissipation, low offset voltage

and temperature drift, make the ALD1712A/ALD1712B/ALD1712 a truly

versatile, user friendly, operational amplifier.

On-chip offset voltage trimming allows the device to be used without

nulling in most applications. The device offers typical offset drift of less

than 5μV/°C which eliminates many trim or temperature compensation

circuits. For precision applications, the ALD1712A/ALD1712B/ALD1712

is designed to settle to 0.01 in 8μs. The unique characteristics at input

and output are modeled in an available macromodel. Additionally, robust

design and rigorous screening make this device especially suitable for

operation in temperature-extreme environments and rugged conditions.

FEATURES

? Linear mode operation with input voltages

300mV beyond supply rails

? Symmetrical complementary output drive

? Output voltages to within 2mV of power

supply rails

? High load capacitance capability --

4000pF typical

? No frequency compensation required --

unity gain stable

? Extremely low input bias currents --

0.01pA typical

? Dual power supply ±2.5V to ±5.0V

? Single power supply +5V to +10V

? High voltage gain – typically 85V/mV

@ ±2.5V and 250V/mV @ ±5.0V

? Drive as low as 1KΩ load with 5mA

drive current

? Output short circuit protected

? Unity gain bandwidth of 1.5MHz

? Slew rate of 2.1V/μs

? 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

? Coaxial cable driver