FEATURES & BENEFITS

• Extremely low input offset voltages and

extremely low input bias currents

• Extremely low input signal power

• Robust high-temperature operation

• Industry standard pinout

• Rail-to-rail input/output

• Input bias current of 0.01pA at input

offset voltage of 30μV

• No external components

• No internal chopper clocking noise

• No chopper dynamic power dissipation

• Simple and cost effective

• Small package size

• Drive up to 4000pF load capacitance

• Low power dissipation

• Suitable for rugged, temperature-extreme

environments

APPLICATIONS

• Precision cable driver

• Sensor interface circuits

• Unity gain buffer amplifier

• Precision analog cable driver

• 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

• System output level shifter

GENERAL DESCRIPTION

The ALD1732A/ALD1732 is a precision low-cost low-power monolithic

CMOS operational amplifier intended for a broad range of precision applications

requiring exremely low input signal power. Input signal power is the

product of input offset voltage and input bias current, which represents the

minimum required power draw from the signal source in order to drive the

input of the operational amplifier. Input signal power is also a figure of merit

in source loading and its associated error, and is a measure of the basic

signal resolution possible through the operational amplifier for a given signal

source. For certain types of signal sources, signal loading directly translates

into a significant distortion or interface noise equivalent term.

Manufactured with Advanced Linear Devices' enhanced EPAD® silicon

gate CMOS process, the ALD1732A/ALD1732 is designed to set a new

standard in low input signal power requirements. The typical input loading

at its input is 0.03 mV offset voltage and 0.01 pA input bias current at 25C,

resulting in 0.0003 fW input signal power draw. This input characteristic

virtually eliminates any loading effects on most types of signal sources,

offering unparalled accuracy and signal integrity and fidelity. The

ALD1732A/ALD1732 is ideally suited for capacitive and high sensitivity,

high impedance signal sources. It is readily suited for +5V single supply (or

±2V to ±5V) systems, with low operating power dissipation, a traditional

strength of CMOS technology. It is offered with industry standard μA741 and

ICL7611 pin configurations.

The ALD1732A/ALD1732 can operate with rail to rail large signal input and

output voltages with relatively high slew rate. The input voltage can be equal

to or exceed the positive and negative supply voltages while the output

voltage can swing close to these supply voltage rails. This feature significantly

reduces the supply overhead voltage required to operate the operational

amplifier and allows numerous analog serial stages to operate in a low

power supply environment. In addition, the device can accommodate mixed

applications where digital and analog circuits may operate off the same

power supply or battery. This device also features rail-to-rail input and

output voltage ranges, tolerance to over-voltage input spikes of 300mV

beyond supply rails, high open loop voltage gain, useful bandwidth of

1.5MHz, slew rate of 2.1V/μs, and low supply current of 0.8mA. Finally, the

output stage can typically drive up to 400pF capacitive loads in the unity gain

mode and up to 4000pF capacitive loads at a gain of 5.

These features make the ALD1732A/ALD1732 a versatile, high precision

operational amplifier that is user friendly and easy to use with virtually no

source loading and zero input-loading induced source errors. Additionally,

robust design and rigorous screening make this device especially suitable

for operation in temperature-extreme environments and rugged conditions.