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AD8222 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD8222
Beschreibung Dual-Channel Instrumentation Amplifier
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 25 Seiten
AD8222 Datasheet, Funktion
Data Sheet
FEATURES
Two channels in small 4 mm × 4 mm LFCSP
Gain set with 1 resistor per amplifier (G = 1 to 10,000)
Low noise
8 nV/√Hz at 1 kHz
0.25 µV p-p (0.1 Hz to 10 Hz)
High accuracy dc performance (B grade)
60 µV maximum input offset voltage
0.3 µV/°C maximum input offset drift
1.0 nA maximum input bias current
126 dB minimum CMRR (G = 100)
Excellent ac performance
140 kHz bandwidth (G = 100)
13 µs settling time to 0.001%
Differential output option (single channel)
Fully specified
Adjustable common-mode output
Supply range: ±2.3 V to ±18 V
APPLICATIONS
Multichannel data acquisition for
ECG and medical instrumentation
Industrial process controls
Wheatstone bridge sensors
Differential drives for
High resolution input ADCs
Remote sensors
GENERAL DESCRIPTION
The AD8222 is a dual-channel, high performance instrumentation
amplifier that requires only one external resistor per amplifier
to set gains of 1 to 10,000.
The AD8222 is the first dual-instrumentation amplifier in the
small 4 mm × 4mm LFCSP. It requires the same board area as a
typical single instrumentation amplifier. The smaller package
allows a 2× increase in channel density and a lower cost per
channel, all with no compromise in performance.
The AD8222 can also be configured as a single-channel, differen-
tial output instrumentation amplifier. Differential outputs provide
high noise immunity, which can be useful when the output
signal must travel through a noisy environment, such as with
remote sensors. The configuration can also be used to drive
differential input analog-to-digital converters (ADCs). The
Precision, Dual-Channel
Instrumentation Amplifier
AD8222
FUNCTIONAL BLOCK DIAGRAM
16 15 14 13
AD8222
–IN1 1
RG1 2
RG1 3
+IN1 4
12 –IN2
11 RG2
10 RG2
9 +IN2
5 678
Figure 1.
AD8222 maintains a minimum CMRR of 80 dB to 4 kHz for all
grades at G = 1. High CMRR over frequency allows the AD8222
to reject wideband interference and line harmonics, greatly
simplifying filter requirements. The AD8222 also has a typical
CMRR drift over temperature of just 0.07 µV/V/°C at G = 1.
The AD8222 operates on both single and dual supplies and only
requires 2.2 mA maximum supply current for both amplifiers.
It is specified over the industrial temperature range of −40°C to
+85°C and is fully RoHS compliant.
For a single-channel version, see the AD8221.
Table 1. Instrumentation Amplifiers by Category1
General-
Military Low
Purpose Zero Drift Grade
Power
High
Speed PGA
AD8220 AD8231
AD620 AD8235 AD8250
AD8221 AD8290
AD621 AD8236 AD8251
AD8222 AD8293G80 AD524
AD627
AD8253
AD8224 AD8553
AD526 AD623
AD8228 AD8556
AD624 AD8223
AD8295 AD8557
AD8226
AD8227
1 See www.analog.com for the latest selection of instrumentation amplifiers.
Rev. B
Document Feedback
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2006–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com






AD8222 Datasheet, Funktion
Data Sheet
AD8222
VS = ±15 V, VREF = 0 V, TA = 25°C, RL = 2 kΩ, unless otherwise noted.
Table 3. Single-Ended Output Configuration—Dynamic Performance (Both Amplifiers)
A Grade
B Grade
Parameter
Test Conditions/Comments Min Typ
Max Min Typ
Max Unit
DYNAMIC RESPONSE
Small Signal −3 dB Bandwidth
G=1
1200
1200
kHz
G = 10
750 750 kHz
G = 100
140 140 kHz
G = 1000
15 15 kHz
Settling Time 0.01%
10 V step
G = 1 to 100
10 10 µs
G = 1000
80 80 µs
Settling Time 0.001%
10 V step
G = 1 to 100
13 13 µs
G = 1000
110 110 µs
Slew Rate
G=1
1.5 2
1.5 2
V/µs
G = 5 to 1000
2 2.5
2 2.5
V/µs
Table 4. Differential Output Configuration1—Dynamic Performance
Parameter
DYNAMIC RESPONSE
Small Signal −3 dB Bandwidth
G=1
G = 10
G = 100
G =1000
Settling Time 0.01%
G = 1 to 100
G = 1000
Settling Time 0.001%
G = 1 to 100
G = 1000
Slew Rate
Test Conditions/Comments Min
10 V step
10 V step
G=1
G = 5 to 1000
1.5
2
1 Refers to differential configuration shown in Figure 50.
A Grade
Typ Max
1000
650
140
15
15
80
18
110
2
2.5
B Grade
Min Typ Max
1000
650
140
15
15
80
18
110
1.5 2
2 2.5
Unit
kHz
kHz
kHz
kHz
µs
µs
µs
µs
V/µs
V/µs
Rev. B | Page 5 of 24

6 Page









AD8222 pdf, datenblatt
Data Sheet
30
20
10
0
1 10 100 1k 10k
LOAD RESISTANCE ()
Figure 22. Output Voltage Swing vs. Load Resistance
+VS–0
–1
–2
–3
SOURCING
+3
+2
SINKING
+1
–VS+0
0 1 2 3 4 5 6 7 8 9 10 11 12
OUTPUT CURRENT (mA)
Figure 23. Output Voltage Swing vs. Output Current, G = 1
4
3
2
1 10kLOAD
0
2kLOAD
–1
600LOAD
–2
–3
–4
–10 –8 –6 –4 –2 0 2 4 6
VOUT (V)
Figure 24. Gain Nonlinearity, G = 1
8 10
AD8222
40
30
20 2kLOAD
10
0
–10 600LOAD 10kLOAD
–20
–30
–40
–10 –8 –6 –4 –2 0 2 4 6
VOUT (V)
Figure 25. Gain Nonlinearity, G = 100
8 10
1k
GAIN = 1
100
GAIN = 10
GAIN = 100
10
GAIN = 1000
GAIN = 1000
BW LIMIT
1
1 10 100 1k 10k 100k
FREQUENCY (Hz)
Figure 26. Voltage Noise Spectral Density vs. Frequency (G = 1 to 1000)
2µV/DIV
1s/DIV
Figure 27. 0.1 Hz to 10 Hz RTI Voltage Noise (G = 1)
Rev. B | Page 11 of 24

12 Page





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