高精密仪表用差分运算放大器AD620
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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 min Common-Mode Rejection Ratio (G = 10)
ppm/°C ppm/°C
VOLTAGE OFFSET Input Offset, VOSI Over Temperature Average TC Output Offset, VOSO
Over Temperature Average TC Offset Referred to the Input vs. Supply (PSR)
30,000
10,000
TOTAL ERROR, PPM OF FULL SCALE RTI VOLTAGE NOISE (0.1 – 10Hz) – V p-p
25,000
20,000
15,000 10,000
5,000
AD620A RG
3 OP-AMP IN-AMP (3 OP-07s)
1,000 100 10 1
0.5 2.0 2.5
3.0 0.3 1.0
1.5 1.5
0.5 1.0 1.5
3.0 0.3 0.5
0.75 1.5
0.5 2 4
8.0 0.3 1.0
2.0 8.0
nA nA pA/°C nA nA pA/°C
INPUT Input Impedance Differential Common-Mode Input Voltage Range3 Over Temperature
0.1 1k
10k
100k
1M
10M
SOURCE RESISTANCE – ⍀
100M
Figure 2. Total Voltage Noise vs. Source Resistance
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
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%
140
30 125 225
0.3 1.0 400 1000
1500 2000 5.0 15
µV µV µV/°C µV µV µV µV/°C
80
100
dB
95
120
dB
110
140
dB
110
140
dB
INPUT CURRENT Input Bias Current Over Temperature Average TC Input Offset Current Over Temperature Average TC
Nonlinearity, G = 1–1000 G = 1–100
Gain vs. Temperature
VOUT = –10 V to +10 V, RL = 10 kΩ RL = 2 kΩ
G =1
Gain >12
10,000
1
0.03 0.10 0.15 0.30 0.15 0.30 0.40 0.70
+VS – 1.2 +VS – 1.3 +VS – 1.4 +VS – 1.4
–VS + 1.9 –VS + 2.1 –VS + 1.9 –VS + 2.3
10ʈ2 10ʈ2
VCM = 0 V to ± 10 V
–VS + 1.9 –VS + 2.1 –VS + 1.9 –VS + 2.1
10ʈ2 10ʈ2
+VS – 1.2 +VS – 1.3 +VS – 1.4 +VS – 1.4
–VS + 1.9 –VS + 2.1 –VS + 1.9 –VS + 2.1
10ʈ2 10ʈ2
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999
AD620–SPECIFICATIONS (Typical @ +25؇C, VS = ؎15 V, and RL = 2 k⍀, unless otherwise noted)
10 40 10 95
10 –50
10,000
1
0.01 0.02 0.10 0.15 0.10 0.15 0.35 0.50
10 40 10 95
10 –50
10,000
0.03 0.10 0.15 0.30 0.15 0.30 0.40 0.70
10 40 10 95
10 –50
% % % %
ppm ppm
VS = ± 2.3 V to ± 18 V 80 95 110 110
30 125 185
0.3 1.0 400 1000
1500 2000 5.0 15
100 120 140 140
15 50 85
0.1 0.6 200 500
750 1000 2.5 7.0
80
100
100
120
120
140
120
APPLICATIONS Weigh Scales ECG and Medical Instrumentation Transducer Interface Data Acquisition Systems Industrial Process Controls Battery Powered and Portable Equipment
TYPICAL STANDARD BIPOLAR INPUT IN-AMP
G = 100
AD620 SUPERETA BIPOLAR INPUT IN-AMP
0
0
5
10
15
20
SUPPLY CURRENT – mA
Figure 1. Three Op Amp IA Designs vs. AD620
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, 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 inamp per channel.
Model
Conditions
AD620A
Min
Typ Max
AD620B
Min
Typ Max
AD620S1
Min
Typ Max
Units
GAIN Gain Range
G = 1 + (49.4 k/RG) 1
Gain Error2 G=1
VOUT = ± 10 V
G = 10
G = 100
G = 1000
CONNECTION DIAGRAM 8-Lead Plastic Mini-DIP (N), Cerdip (Q)
and SOIC (R) Packages
RG 1 –IN 2 +IN 3 –VS 4
AD620
TOP VIEW
8 RG 7 +VS 6 OUTPUT 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 for battery powered, portable (or remote) applications.
a
Low Cost, Low Power Instrumentation Amplifier
FEATURES EASY TO USE Gain 源自文库et 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
Over Temperature Common-Mode Rejection
Ratio DC to 60 Hz with I kΩ Source Imbalance
G=1 G = 10 G = 100 G = 1000
VS = ± 2.3 V to ± 5 V VS = ± 5 V to ± 18 V
PRODUCT DESCRIPTION The AD620 is a low cost, high accuracy instrumentation amplifier that requires only one external resistor to set gains of 1 to
AD620
REV. E
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.
G=1 G = 10 G = 100 G = 1000
(Total RTI Error = VOSI + VOSO/G) VS = ± 5 V to ± 15 V VS = ± 5 V to ± 15 V VS = ± 5 V to ± 15 V VS = ± 15 V VS = ± 5 V VS = ± 5 V to ± 15 V VS = ± 5 V to ± 15 V
ppm/°C ppm/°C
VOLTAGE OFFSET Input Offset, VOSI Over Temperature Average TC Output Offset, VOSO
Over Temperature Average TC Offset Referred to the Input vs. Supply (PSR)
30,000
10,000
TOTAL ERROR, PPM OF FULL SCALE RTI VOLTAGE NOISE (0.1 – 10Hz) – V p-p
25,000
20,000
15,000 10,000
5,000
AD620A RG
3 OP-AMP IN-AMP (3 OP-07s)
1,000 100 10 1
0.5 2.0 2.5
3.0 0.3 1.0
1.5 1.5
0.5 1.0 1.5
3.0 0.3 0.5
0.75 1.5
0.5 2 4
8.0 0.3 1.0
2.0 8.0
nA nA pA/°C nA nA pA/°C
INPUT Input Impedance Differential Common-Mode Input Voltage Range3 Over Temperature
0.1 1k
10k
100k
1M
10M
SOURCE RESISTANCE – ⍀
100M
Figure 2. Total Voltage Noise vs. Source Resistance
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
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%
140
30 125 225
0.3 1.0 400 1000
1500 2000 5.0 15
µV µV µV/°C µV µV µV µV/°C
80
100
dB
95
120
dB
110
140
dB
110
140
dB
INPUT CURRENT Input Bias Current Over Temperature Average TC Input Offset Current Over Temperature Average TC
Nonlinearity, G = 1–1000 G = 1–100
Gain vs. Temperature
VOUT = –10 V to +10 V, RL = 10 kΩ RL = 2 kΩ
G =1
Gain >12
10,000
1
0.03 0.10 0.15 0.30 0.15 0.30 0.40 0.70
+VS – 1.2 +VS – 1.3 +VS – 1.4 +VS – 1.4
–VS + 1.9 –VS + 2.1 –VS + 1.9 –VS + 2.3
10ʈ2 10ʈ2
VCM = 0 V to ± 10 V
–VS + 1.9 –VS + 2.1 –VS + 1.9 –VS + 2.1
10ʈ2 10ʈ2
+VS – 1.2 +VS – 1.3 +VS – 1.4 +VS – 1.4
–VS + 1.9 –VS + 2.1 –VS + 1.9 –VS + 2.1
10ʈ2 10ʈ2
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999
AD620–SPECIFICATIONS (Typical @ +25؇C, VS = ؎15 V, and RL = 2 k⍀, unless otherwise noted)
10 40 10 95
10 –50
10,000
1
0.01 0.02 0.10 0.15 0.10 0.15 0.35 0.50
10 40 10 95
10 –50
10,000
0.03 0.10 0.15 0.30 0.15 0.30 0.40 0.70
10 40 10 95
10 –50
% % % %
ppm ppm
VS = ± 2.3 V to ± 18 V 80 95 110 110
30 125 185
0.3 1.0 400 1000
1500 2000 5.0 15
100 120 140 140
15 50 85
0.1 0.6 200 500
750 1000 2.5 7.0
80
100
100
120
120
140
120
APPLICATIONS Weigh Scales ECG and Medical Instrumentation Transducer Interface Data Acquisition Systems Industrial Process Controls Battery Powered and Portable Equipment
TYPICAL STANDARD BIPOLAR INPUT IN-AMP
G = 100
AD620 SUPERETA BIPOLAR INPUT IN-AMP
0
0
5
10
15
20
SUPPLY CURRENT – mA
Figure 1. Three Op Amp IA Designs vs. AD620
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, 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 inamp per channel.
Model
Conditions
AD620A
Min
Typ Max
AD620B
Min
Typ Max
AD620S1
Min
Typ Max
Units
GAIN Gain Range
G = 1 + (49.4 k/RG) 1
Gain Error2 G=1
VOUT = ± 10 V
G = 10
G = 100
G = 1000
CONNECTION DIAGRAM 8-Lead Plastic Mini-DIP (N), Cerdip (Q)
and SOIC (R) Packages
RG 1 –IN 2 +IN 3 –VS 4
AD620
TOP VIEW
8 RG 7 +VS 6 OUTPUT 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 for battery powered, portable (or remote) applications.
a
Low Cost, Low Power Instrumentation Amplifier
FEATURES EASY TO USE Gain 源自文库et 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
Over Temperature Common-Mode Rejection
Ratio DC to 60 Hz with I kΩ Source Imbalance
G=1 G = 10 G = 100 G = 1000
VS = ± 2.3 V to ± 5 V VS = ± 5 V to ± 18 V
PRODUCT DESCRIPTION The AD620 is a low cost, high accuracy instrumentation amplifier that requires only one external resistor to set gains of 1 to
AD620
REV. E
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.
G=1 G = 10 G = 100 G = 1000
(Total RTI Error = VOSI + VOSO/G) VS = ± 5 V to ± 15 V VS = ± 5 V to ± 15 V VS = ± 5 V to ± 15 V VS = ± 15 V VS = ± 5 V VS = ± 5 V to ± 15 V VS = ± 5 V to ± 15 V