Micropower Precision CMOS

Operational Amplifier

AD8500

Rev. A

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FEATURES

Supply current: 1

μA maximum

Offset voltage: 1 mV maximum

Single-supply or dual-supply operation

Rail-to-rail input and output

No phase reversal

Unity gain stable

APPLICATIONS

Portable equipment

Remote sensors

Low power filters

Threshold detectors

Current sensing

GENERAL DESCRIPTION

The AD8500 is a low power, precision CMOS op amp featuring

a maximum supply current of 1 μA. The AD8500 has a maximum

offset voltage of 1 mV and a typical input bias current of 1 pA; it

operates rail-to-rail on both the input and output. The AD8500

can operate from a single-supply voltage of +1.8 V to +5.5 V or

a dual-supply voltage of ±0.9 V to ±2.75 V.

With its low power consumption, low input bias current, and

rail-to-rail input and output, the AD8500 is ideally suited for

a variety of battery-powered portable applications. Potential

applications include ECGs, pulse monitors, glucose meters,

smoke and fire detectors, vibration monitors, and backup

battery sensors.

PIN CONFIGURATION

AD8500

TOP VIEW

(Not to Scale)

V+

–IN

5

4

Figure 1. 5-Lead SC70

The ability to swing rail-to-rail at both the input and output helps

maximize dynamic range and signal-to-noise ratio in systems

that operate at very low voltages. The low offset voltage allows

the AD8500 to be used in systems with high gain without having

excessively large output offset errors, and it provides high accuracy

without the need for system calibration.

The AD8500 is fully specified over the industrial temperature

range (−40°C to +85°C) and is operational over the extended

industrial temperature range (−40°C to +125°C). It is available

in a 5-lead, SC70 surface-mount package.