Ad620 datasheet

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FEATURES EASY TO USE Gain Set with One External Resistor (Gain Range 1 to 1000) Wide Power Supply Range ( 2.3 V to 18 V) Higher Performance than Three Op Amp IA Designs Available in 8-Lead DIP and SOIC Packaging Low Power, 1.3 mA max Supply Current EXCELLENT DC PERFORMANCE (“B GRADE”) 50 V max, Input Offset Voltage 0.6 V/ C max, Input Offset Drift 1.0 nA max, Input Bias Current 100 dB minCommon-Mode Rejection Ratio (G = 10) LOW NOISE 9 nV/√Hz, @ 1 kHz, Input Voltage Noise 0.28 V p-p Noise (0.1 Hz to 10 Hz) EXCELLENT AC SPECIFICATIONS 120 kHz Bandwidth (G = 100) 15 s Settling Time to 0.01% APPLICATIONS Weigh Scales ECG and Medical Instrumentation Transducer Interface Data Acquisition Systems Industrial Process Controls Battery Powered and Portable Equipment PRODUCT DESCRIPTION

LowCost, Low Power Instrumentation Amplifier AD620
CONNECTION DIAGRAM 8-Lead Plastic Mini-DIP (N), Cerdip (Q) and SOIC (R) Packages
RG –IN +IN –VS 1 2 3 4 8 RG

7 +VS 6 OUTPUT

AD620
TOP VIEW

5 REF

1000. Furthermore, the AD620 features 8-lead SOIC and DIP packaging that is smaller than discrete designs, and offers lower power (only 1.3 mA max supply current), making it a good fit forbattery powered, portable (or remote) applications. The AD620, with its high accuracy of 40 ppm maximum nonlinearity, low offset voltage of 50 µV max and offset drift of 0.6 µV/°C max, is ideal for use in precision data acquisition systems, such as weigh scales and transducer interfaces. Furthermore, the low noise, low input bias current, and low power of the AD620 make it well suited for medicalapplications such as ECG and noninvasive blood pressure monitors. The low input bias current of 1.0 nA max is made possible with the use of Superβeta processing in the input stage. The AD620 works well as a preamplifier due to its low input voltage noise of 9 nV/√Hz at 1 kHz, 0.28 µV p-p in the 0.1 Hz to 10 Hz band, 0.1 pA/√Hz input current noise. Also, the AD620 is well suited for multiplexedapplications with its settling time of 15 µs to 0.01% and its cost is low enough to enable designs with one inamp per channel.
10,000

The AD620 is a low cost, high accuracy instrumentation amplifier that requires only one external resistor to set gains of 1 to
30,000

TOTAL ERROR, PPM OF FULL SCALE

25,000

3 OP-AMP IN-AMP (3 OP-07s)

1,000

20,000

RTI VOLTAGE NOISE (0.1 – 10Hz) – V p-pTYPICAL STANDARD BIPOLAR INPUT IN-AMP 100 G = 100 10 AD620 SUPER ETA BIPOLAR INPUT IN-AMP

15,000

AD620A
10,000 RG

5,000

1

0 0 5 10 SUPPLY CURRENT – mA 15 20

0.1 1k

10k

100k 1M SOURCE RESISTANCE –

10M

100M

Figure 1. Three Op Amp IA Designs vs. AD620

Figure 2. Total Voltage Noise vs. Source Resistance

REV. E
Information furnished by Analog Devices isbelieved 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: 781/329-4700 WorldWide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999

AD620–SPECIFICATIONS
Model GAIN Gain Range Gain Error2 G=1 G = 10 G = 100 G = 1000 Nonlinearity, G = 1–1000 G = 1–100 Gain vs. Temperature Conditions G = 1 + (49.4 k/R G) VOUT = ± 10 V

(Typical @ +25 C, VS =
Min 1 0.03 0.15 0.15 0.40 AD620A Typ Max 10,000 0.10 0.30 0.30 0.70 40 95 10 –50 30 0.3 400 125 1851.0 1000 1500 2000 15

15 V, and RL = 2 k , unless otherwise noted)
Min 1 0.01 0.10 0.10 0.35 10 10 AD620B Typ Max 10,000 0.02 0.15 0.15 0.50 40 95 10 –50 15 0.1 200 50 85 0.6 500 750 1000 7.0 30 0.3 400 Min 1 0.03 0.15 0.15 0.40 10 10 AD620S1 Typ Max 10,000 0.10 0.30 0.30 0.70 40 95 10 –50 125 225 1.0 1000 1500 2000 15 % % % % ppm ppm ppm/°C ppm/°C µV µV µV/°C µV µV µV µV/°C Units

VOUT =...
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