AD620_04 AD [Analog Devices], AD620_04 Datasheet

AD620_04

Manufacturer Part Number

AD620_04

Description

Low Cost Low Power Instrumentation Amplifier

Manufacturer

AD [Analog Devices]

Datasheet

1.AD620_04.pdf (20 pages)

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FEATURES

Easy to use

Excellent dc performance (B grade)

Low noise

Excellent ac specifications

APPLICATIONS

Weigh scales

ECG and medical instrumentation

Transducer interface

Data acquisition systems

Industrial process controls

Battery-powered and portable equipment

Rev. G

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 that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

Gain set with one external resistor

Wide power supply range (±2.3 V to ±18 V)

Higher performance than 3 op amp IA designs

Available in 8-lead DIP and SOIC packaging

Low power, 1.3 mA max supply current

50 µV max, input offset voltage

0.6 µV/°C max, input offset drift

1.0 nA max, input bias current

100 dB min common-mode rejection ratio (G = 10)

9 nV/√Hz @ 1 kHz, input voltage noise

0.28 µV p-p noise (0.1 Hz to 10 Hz)

120 kHz bandwidth (G = 100)

15 µs settling time to 0.01%

(Gain range 1 to 10,000)

30,000

25,000

20,000

15,000

10,000

5,000

Figure 2. Three Op Amp IA Designs vs. AD620

AD620A

SUPPLY CURRENT (mA)

3 OP AMP

(3 OP-07s)

IN-AMP

PRODUCT DESCRIPTION

The AD620 is a low cost, high accuracy instrumentation

amplifier that requires only one external resistor to set gains of

1 to 10,000. 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 for battery-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 medical applications, 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,

and 0.1 pA/√Hz input current noise. Also, the AD620 is well

suited for multiplexed applications with its settling time of 15 µs

to 0.01%, and its cost is low enough to enable designs with one

in-amp per channel.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.326.8703

Figure 1. 8-Lead PDIP (N), CERDIP (Q), and SOIC (R) Packages

Instrumentation Amplifier

10,000

Figure 3. Total Voltage Noise vs. Source Resistance

1,000

100

0.1

–V

+IN

–IN

CONNECTION DIAGRAM

G = 100

10k

Low Cost Low Power

TYPICAL STANDARD

BIPOLAR INPUT

IN-AMP

TOP VIEW

AD620

SOURCE RESISTANCE ( Ω )

100k

AD620 SUPER β ETA

BIPOLAR INPUT

IN-AMP

OUTPUT

REF

10M

www.analog.com

100M

AD620

Related parts for AD620_04

AD620_04 Summary of contents

Page 1

FEATURES Easy to use Gain set with one external resistor (Gain range 1 to 10,000) Wide power supply range (±2 ±18 V) Higher performance than 3 op amp IA designs Available in 8-lead DIP and SOIC packaging Low ...

Page 2

AD620 TABLE OF CONTENTS Specifications .....................................................................................3 Absolute Maximum Ratings ............................................................5 ESD Caution ..................................................................................5 Typical Performance Characteristics ..............................................7 Theory of Operation .......................................................................13 Gain Selection..............................................................................16 Input and Output Offset Voltage ..............................................16 Reference Terminal .....................................................................16 REVISION HISTORY 12/04—Rev Rev. G Updated ...

Page 3

SPECIFICATIONS Typical @ 25° ±15 V, and kΩ, unless otherwise noted Table 1. Parameter Conditions GAIN (49.4 kΩ/R Gain Range ±10 V Gain Error OUT G ...

Page 4

AD620 Parameter Conditions Common-Mode Rejection Ratio with 1 kΩ Source Imbalance ± 100 G = 1000 OUTPUT Output Swing R ...

Page 5

ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage 1 Internal Power Dissipation Input Voltage (Common-Mode) Differential Input Voltage Output Short-Circuit Duration Storage Temperature Range (Q) Storage Temperature Range (N, R) Operating Temperature Range AD620 (A, B) AD620 (S) Lead Temperature ...

Page 6

AD620 Figure 4. Metallization Photograph. Dimensions shown in inches and (mm). Contact sales for latest dimensions. Rev Page ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS (@ 25° ± kΩ, unless otherwise noted SAMPLE SIZE = 360 –80 –40 0 INPUT OFFSET VOLTAGE ( µ V) Figure 5. Typical ...

Page 8

AD620 1000 100 FREQUENCY (Hz) Figure 11. Current Noise Spectral Density vs. Frequency TIME (1 SEC/DIV) Figure 12. 0 RTI Voltage Noise ( TIME (1 SEC/DIV) Figure 13. 0 ...

Page 9

G = 1000 120 100 0 100 1k 10k FREQUENCY (Hz) Figure 17. Positive PSR vs. Frequency, RTI (G = 1−1000) 180 160 140 120 100 0.1 ...

Page 10

AD620 ±15V 100 LOAD RESISTANCE ( Ω) Figure 23. Output Voltage Swing vs. Load Resistance . . . . . . . . . . . . . . ...

Page 11

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Page 12

AD620 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 13

THEORY OF OPERATION 20µ 20µ 10kΩ 10kΩ 400Ω – GAIN GAIN SENSE SENSE –V S Figure 38. Simplified Schematic of AD620 The AD620 is ...

Page 14

AD620 Regardless of the system in which it is being used, the AD620 provides greater accuracy at low power and price. In simple systems, absolute accuracy and drift errors are by far the most significant contributors to error. In more ...

Page 15

G = 100 499 Ω 3k Ω 3k Ω 1.7mA Figure 40. A Pressure Monitor Circuit that Operates Single Supply Pressure Measurement Although useful in many bridge applications, such as weigh ...

Page 16

AD620 Precision V-I Converter The AD620, along with another op amp and two resistors, makes a precision current source (Figure 42). The op amp buffers the reference terminal to maintain good CMR. The output voltage the AD620 ...

Page 17

+IN + AD620 C 499Ω – REF – 0.1µ F –15V Figure 43. Circuit to Attenuate RF Interference COMMON-MODE REJECTION Instrumentation amplifiers, such as the AD620, offer high CMR, which ...

Page 18

AD620 GROUND RETURNS FOR INPUT BIAS CURRENTS Input bias currents are those currents necessary to bias the input transistors of an amplifier. There must be a direct return path for these currents. Therefore, when amplifying “floating” input sources, such as ...

Page 19

OUTLINE DIMENSIONS 0.400 (10.16) 0.365 (9.27) 0.355 (9.02 0.280 (7.11) 0.250 (6.35) 1 0.240 (6.10) 4 PIN 1 0.100 (2.54) BSC 0.060 (1.52) 0.210 MAX (5.33) MAX 0.015 0.150 (3.81) (0.38) 0.015 (0.38) MIN GAUGE 0.130 (3.30) PLANE ...

Page 20

AD620 ORDERING GUIDE Model AD620AN 2 AD620ANZ AD620BN 2 AD620BNZ AD620AR 2 AD620ARZ AD620AR-REEL AD620ARZ-REEL 2 AD620AR-REEL7 AD620ARZ-REEL7 2 AD620BR 2 AD620BRZ AD620BR-REEL 2 AD620BRZ-RL AD620BR-REEL7 2 AD620BRZ-R7 AD620ACHIPS AD620SQ/883B Plastic DIP CERDIP ...

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