GENERAL DESCRIPTION

The ALD4702A/ALD4702B/ALD4702 is a quad monolithic precision

CMOS rail-to-rail operational amplifier intended for a broad range of

analog applications using ±2.5V to ±5V dual power supply systems, as

well as +4V to +10V battery operated systems. All device characteristics

are specified for +5V single supply or ±2.5V dual supply systems. Total

supply current for four operational amplifiers is 6mA maximum at 5V

supply voltage. It is manufactured with Advanced Linear Devices'

enhanced ACMOS silicon gate CMOS process.

The ALD4702A/ALD4702B/ALD4702 is designed to offer a trade-off of

performance parameters providing a wide range of desired

specifications. It has been developed specifically with the +5V single

supply or ±2.5V dual supply user andoffers the popular industry pin

configuration of LM324 and ICL7641 types.

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 5KΩ resistive loads

in non-inverting unity gain connection and double the capacitance in

the inverting unity gain mode.

These features, coupled with extremely low input currents, high

voltage gain, useful bandwidth of 1.5MHz, a slew rate of 2.1V/μs, low

power dissipation, low offset voltage and temperature drift, make the

ALD4702A/ALD4702B/ALD4702 a truly versatile, user friendly,

operational amplifier.

The ALD4702A/ALD4702B/ALD4702 is designed and fabricated with

silicon gate CMOS technology, and offers 1pA typical input bias

current. 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 7μV/°C which eliminates many trim or temperature

compensation circuits. For precision applications, the ALD4702A/

ALD4702B/ALD4702 is designed to settle to 0.01 in 8μs. 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 class AB output drivers

• All parameters specified for +5V single supply

or ±2.5V dual supply systems

• Inputs can extend beyond supply rails by 300mV

• Outputs settle to 2mV of supply rails

• High load capacitance capability up to 4000pF

• No frequency compensation required --

unity gain stable

• Extremely low input bias currents --

1.0pA typical

• Ideal for high source impedance applications

• Dual power supply ±2.5V to ±5.0V operation

• Single power supply +5V to +10V operation

• High voltage gain-typically 85V/mV @ ±2.5V

and 250V/mV @ ±5.0V

• Drive as low as 2KΩ load with 5mA drive current

• Output short circuit protected

• Unity gain bandwidth of 1.5MHz

• Slew rate of 1.9V/μs

• Low power 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 convert

• Coaxial cable driver