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Low Drift, Low Power Instrumentation Amplifier AD621

FEATURES EASY TO USE Pin-Strappable Gains of 10 & 100 All Errors Specified for Total System Performance Higher Performance than Discrete In-Amp Designs Available in 8-Pin DIP and SOIC Low Power, 1.3 mA max Supply Current Wide Power Supply Range (؎2.3 V to ؎18 V)

CONNECTION DIAGRAM 8-Pin Plastic Mini-DIP (N), Cerdip (Q) and SOIC (R) Packages

G=10/100

2

7

+VS

+IN

3

6

OUTPUT

–VS

EXCELLENT DC PERFORMANCE 0.15% max, Total Gain Error ؎5 ppm/؇C, Total Gain Drift 125 ␮V max, Total Offset Voltage 1.0 ␮V/؇C max, Offset Voltage Drift

8

4

5

REF

G=10/100

1

–IN

AD621

TOP VIEW

pin strapping. The AD621 is fully specified as a total system, therefore, simplifying the design process.

LOW NOISE 9 nV/√Hz, @ 1 kHz, Input Voltage Noise 0.28 ␮V p Noise (0.1 Hz to 10 Hz} EXCELLENT AC SPECIFICATIONS 800 kHz Bandwidth (G = 10}, 200 kHz (G = 100} 12 ␮s Settling Time to 0.01% APPLICATIONS Weigh Scales Transducer Interface & Data Acquisition Systems Industrial Process Controls Battery Powered and Portable Equipment PRODUCT DESCRIPTION

The AD621 is an easy to use, low cost, low power, high accuracy instrumentation amplifier which is ideally suited for a wide range of applications. Its unique combination of high performance, small size and low power, outperforms discrete in amp implementations. High functionality, low gain errors and low gain drift errors are achieved by the use of internal gain setting resistors. Fixed gains of 10 and 100 can be easily set via external 30,000

For portable or remote applications, where power dissipation, size and weight are critical, the AD621 features a very low supply current of 1.3 mA max and is packaged in a compact 8-pin SOIC, 8-pin plastic DIP or 8-pin cerdip. The AD621 also excels in applications requiring high total accuracy, such as precision data acquisition systems used in weigh scales and transducer interface circuits. Low maximum error specifications including nonlinearity of 10 ppm, gain drift of 5 ppm/°C, 50 µV offset voltage and 0.6 µV/°C offset drift (“B” grade), make possible total system performance at a lower cost than has been previously achieved with discrete designs or with other monolithic instrumentation amplifiers. When operating from high source impedances, as in ECG and blood pressure monitors, the AD621 features the ideal combination of low noise and low input bias currents. Voltage noise is specified as 9 nV/√Hz at 1 kHz and 0.28 µV p from 0.1 Hz to 10 Hz. Input current noise is also extremely low at 0.1 pA/√Hz. The AD621 outperforms FET input devices with an input bias current specification of 1.5 nA max over the full industrial temperature range.

3 OP AMP IN-AMPS (3 OP 07'S)

20,000

15,000

AD621A 10,000

5,000

0 5

10 SUPPLY CURRENT – mA

15

20

TOTAL INPUT VOLTAGE NOISE, G = 100 – µVp (0.1 – 10Hz)

TOTAL ERROR, ppm OF FULL SCALE

10,000

25,000

TYPICAL STANDARD BIPOLAR INPUT IN-AMP

1,000

100

10 AD621 SUPERßETA BIPOLAR INPUT IN-AMP

1

0.1 1k

Three Op Amp IA Designs vs. AD621

10k

100k

1M

10M

100M

SOURCE RESISTANCE – Ω

Total Voltage Noise vs. Source Resistance

REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703


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