ANALOG DEVICES AD627 User Guide

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Micropower, Single and Dual Supply Rail-to-Rail Instrumentation Amplifier

AD627

FEATURES FUNCTIONAL BLOCK DIAGRAM Micropower, 85 m A Max Supply Current 8-Lead Plastic DIP (N) and SOIC (R) Wide Power Supply Range (+2.2 V to 618 V) Easy to Use RG RG Gain Set with One External Resistor

–IN +VS

Gain Range 5 (No Resistor) to 1,000

+IN OUTPUT

Higher Performance than Discrete Designs

–VS REF

Rail-to-Rail Output Swing AD627

High Accuracy DC Performance 0.10% Gain Accuracy (G = 5) (AD627A) 10 ppm Gain Drift (G = 5) 125 m V Max Input Offset Voltage (AD627B) Wide supply voltage range (+2.2 V to ±18 V), and micropower 200 m V Max Input Offset Voltage (AD627A) current consumption make the AD627 a perfect fit for a wide 1 m V/8C Max Input Offset Voltage Drift (AD627B) range of applications. Single supply operation, low power con- 3 m V/8C Max Input Offset Voltage Drift (AD627A) sumption and rail-to-rail output swing make the AD627 ideal 10 n A Max Input Bias Current for battery powered applications. Its rail-to-rail output stage Noise: 38 n V/√Hz RTI Noise @ 1 k Hz (G = 100) maximizes dynamic range when operating from low supply Excellent AC Specifications voltages. Dual supply operation (±15 V) and low power con- 77 d B Min CMRR (G = 5) (AD627A) sumption make the AD627 ideal for industrial applications, 83 d B Min CMRR (G = 5) (AD627B) including 4 m A-to-20 m A loop-powered systems. 80 k Hz Bandwidth (G = 5)

The AD627 does not compromise performance, unlike other

135 ms Settling Time to 0.01% (G = 5, 5 V Step)

micropower instrumentation amplifiers. Low voltage offset, APPLICATIONS offset drift, gain error, and gain drift keep dc errors to a mini- 4 m A-to-20 m A Loop Powered Applications mum in the users system. The AD627 also holds errors over Low Power Medical Instrumentation—ECG, EEG frequency to a minimum by providing excellent CMRR over Transducer Interfacing frequency. Line noise, as well as line harmonics, will be rejected, Thermocouple Amplifiers since the CMRR remains high up to 200 Hz.

Industrial Process Controls

The AD627 provides superior performance, uses less circuit

Low Power Data Acquisition

board area and does it for a lower cost than micropower discrete

Portable Battery Powered Instruments

designs.

PRODUCT DESCRIPTION

AD627

The AD627 is an integrated, micropower, instrumentation amplifier that delivers rail-to-rail output swing on single and dual (+2.2 V to ±18 V) supplies. The AD627 provides the user with excellent ac and dc specifications while operating at only 85 µA max. The AD627 offers superior user flexibility by allowing the user

TRADITIONAL

to set the gain of the device with a single external resistor, and

LOW POWER by conforming to the 8-lead industry standard pinout configura- DISCRETE DESIGN

tion. With no external resistor, the AD627 is configured for a gain of 5. With an external resistor, it can be programmed for gains of up to 1000.

FREQUENCY – Hz

Figure 1. CMRR vs. Frequency, ±5 VS, Gain = 5

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use, nor for any infringements of patents or other rights of third parties One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. which may result from its use. No license is granted by implication or Tel: 781/329-4700 World Wide Web Site: http://www.analog.com

otherwise under any patent or patent rights of Analog Devices. Fax: 781/326-8703 © Analog Devices, Inc., 1999