AD621 Analog Devices, Inc., AD621 Datasheet

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AD621

Manufacturer Part Number
AD621
Description
Low Drift, Low Power Instrumentation Amplifier
Manufacturer
Analog Devices, Inc.
Datasheet

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a
PRODUCT DESCRIPTION
The AD621 is an easy to use, low cost, low power, high accu-
racy instrumentation amplifier that is ideally suited for a wide
range of applications. Its unique combination of high perfor-
mance, small size and low power, outperforms discrete in amp
implementations. High functionality, low gain errors, and low
30,000
25,000
20,000
15,000
10,000
5,000
√Hz
0
0
AD621A
5
SUPPLY CURRENT – mA
10
15
3 OP AMP
IN AMP
(3 OP 07
S
)
20
gain drift errors are achieved by the use of internal gain setting
resistors. Fixed gains of 10 and 100 can easily be set via external
pin strapping. The AD621 is fully specified as a total system,
therefore, simplifying the design process.
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-lead SOIC, 8-lead plastic DIP or 8-lead 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 mono-
lithic instrumentation amplifiers.
When operating from high source impedances, as in ECG and
blood pressure monitors, the AD621 features the ideal combina-
tion of low noise and low input bias currents. Voltage noise is
specified as 9 nV/√Hz at 1 kHz and 0.28 µV p-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 tem-
perature range.
10,000
1,000
100
0.1
10
8-Lead Plastic Mini-DIP (N), Cerdip (Q)
1
1k
Instrumentation Amplifier
G = 10/100
CONNECTION DIAGRAM
TYPICAL STANDARD
BIPOLAR INPUT
IN AMP
and SOIC (R) Packages
–V
10k
+IN
–IN
Low Drift, Low Power
S
1
2
3
4
SOURCE RESISTANCE –
(Not to Scale)
TOP VIEW
AD621
100k
8
7
6
5
1M
G = 10/100
OUTPUT
REF
+V
S
AD621 SUPER ETA
BIPOLAR INPUT
IN AMP
AD621
10M
100M

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AD621 Summary of contents

Page 1

... PRODUCT DESCRIPTION The AD621 is an easy to use, low cost, low power, high accu- racy instrumentation amplifier that is ideally suited for a wide range of applications. Its unique combination of high perfor- mance, small size and low power, outperforms discrete in amp implementations. High functionality, low gain errors, and low ...

Page 2

... ± 18 800 0.75 1.2 0. –V + 1.6 +V – 1.6 – ± 0.0001 ± 2.3 ± 18 ± 2.3 0.9 1.3 1.1 1.6 –40 to +85 1 AD621B AD621S Typ Max Min Typ Max 0.05 0. ± 5 ± 5 –1.5 –1 50 125 75 250 215 500 0.6 1.5 1.0 2.5 120 95 120 0.55 0.8 0.55 ...

Page 3

... V + 1.6 +V – 1 ± 0.0001 1 ± 0.0001 ± 18 ± 2.3 ± 18 0.9 1.3 0.9 1.3 1.1 1.6 1.1 1.6 –40 to +85 –55 to +125 AD621 Unit % ppm of FS ppm/°C µV µV µV/°C dB nV/√Hz µV p-p fA/√ pA/° pA/°C GΩ pF GΩ ...

Page 4

... Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite Storage Temperature Range ( –65°C to +150°C Storage Temperature Range ( –65°C to +125°C Operating Temperature Range AD621 ( – 40°C to +85°C AD621 ( – 55°C to +125°C Lead Temperature Range (Soldering 10 seconds 300°C NOTES 1 Stresses above those listed under Absolute Maximum Ratings may cause perma- nent damage to the device. This is a stress rating only ...

Page 5

... SAMPLE SIZE = –80 –40 0 +40 INPUT OFFSET VOLTAGE – SAMPLE SIZE = –400 –200 0 +200 INPUT OFFSET CURRENT – pA Typical Performance Characteristics–AD621 50 SAMPLE SIZE = –800 +200 2.0 1.5 1.0 0 1000 100 10 1 +400 ...

Page 6

... TIME – 1 sec/div TIME – 1 sec/div 100 100 1000 100,000 10,000 1000 100 10 160 140 120 100 0.1 100mV 1s FET INPUT IN AMP AD621A 1k 10k 100k 1M SOURCE RESISTANCE – GAIN = 100 GAIN = 100 1k 10k 100k FREQUENCY – Hz 10M 1M Ω ...

Page 7

... S –0.5 –1.0 –1.5 +1.5 +1.0 +0.5 +0.0 –V S 100k –0.0 S –0.5 –1.0 –1.5 +1.5 +1.0 +0.5 –V +0 10M AD621 & 100 10k 100k FREQUENCY – SUPPLY VOLTAGE Volts R = 10k 10k SUPPLY VOLTAGE Volts ...

Page 8

... AD621 15V 100 LOAD RESISTANCE – 5V 1mV 100 20mV 100 Ω 100 10k 10 s 100 Ω 1mV 10 s Ω 20mV 10 s Ω TO 0.01 OUTPUT STEP SIZE – Volts ...

Page 9

... TEMPERATURE – C 0PW 0 VZR 0 100 V 100 WFM 20 WFM AQR WARNING µ 100 µ 100k 1% INPUT 20V p 11k 0.1% 125 175 2V Ω AD621 100 V 2V Ω 10k 1k 10k 1% 10T – 100 AD621 100 0.1% + – OUT ...

Page 10

... On chip gain resistors are pretrimmed for gains of 10 and 100. The AD621 is preset to a gain of 10. A single external jumper (between Pins 1 and 8) is all that is needed to select a gain of 100. Special design techniques assure a low gain ppm/°C max, even at a gain of 100 ...

Page 11

... V common-mode signal will amplify a ± 1.25 V differential signal while suppressing offset by use of the DAC driving the reference pin of the AD621. An added benefit, the offsetting DAC connected to the reference pin allows removal signal without the associated time-constant of ac coupling ...

Page 12

... DIFF differential-mode input for ± supplies and cascading with use of the optional AD621, the circuit of Figure 6 will provide ± zero suppression at gains of 10 and 100 ( ± 4 ppm/°C and ± 8 ppm/°C, respectively. Therefore, depend- ing on the magnitude of the differential input signal, either ...

Page 13

... R1 ± INPUT AND OUTPUT OFFSET VOLTAGE The AD621 is fully specified for total input errors at gains of 10 and 100. That is, effects of all error sources within the AD621 are properly included in the guaranteed input error specs, elimi- nating the need for separate error calculation. ...

Page 14

... AD621 Gain Selection The AD621 has accurate, low temperature coefficient (TC), gains of 10 and 100 available. The gain of the AD621 is nomi- nally set at 10; this is easily changed to a gain of 100 by simply connecting a jumper between Pins 1 and 8. 555.5 AD621 R 5,555.5 EXT As shown in Figure 11, the device can be programmed for any gain between 10 and 100 by connecting a single external resistor between Pins 1 and 8 ...

Page 15

... GROUNDING Since the AD621 output voltage is developed with respect to the potential on the reference terminal, it can solve many ground- ing problems by simply tying the REF pin to the appropriate “local ground.” In order to isolate low level analog signals from a noisy digital environment, many data-acquisition components have separate analog and digital ground pins (Figure 15). It would be conve- nient to use a single ground line ...

Page 16

... AD621 SEATING PLANE 0.010 (0.25) 0.004 (0.10) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Plastic DIP (N-8) Package 8 5 0.25 0.31 (6.35) (7.87 0.39 (9.91) MAX 0.035 0.01 (0.89 0.25) 0.165 0.01 (4.19 0.25) 0.125 (3.18) MIN 0.18 0.03 (4.57 0.76) 0. 0.018 0.003 (2.54) (0.46 0.08) TYP 0.033 (0.84) NOM Cerdip (Q-8) Package 0.005 (0.13) MIN 0.055 (1.4) MAX 8 5 0.310 (7.87) 0.220 (5.59 0.070 (1.78) 0.030 (0.76) 0.320 (8.13) 0.290 (7.37) ...

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