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PDF AD8420 Data sheet ( Hoja de datos )
| Número de pieza | AD8420 | |
| Descripción | Rail-to-Rail Output Instrumentation Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
FEATURES
Maximum supply current: 90 μA
Minimum CMRR: 100 dB
Drives heavy capacitive loads: ~700 pF
Rail-to-rail output
Input voltage range goes below ground
Gain set with 2 external resistors
Can achieve low gain drift at any gain
Very wide power supply range
Single supply: 2.7 V to 36 V
Dual supply: ±2.7 V to ±18 V
Bandwidth (G = 100): 2.5 kHz
Input voltage noise: 55 nV/√Hz
High dc precision
Maximum offset voltage: 125 μV
Maximum offset drift: 1 μV/°C
Maximum differential input voltage: ±1 V
8-lead MSOP package
APPLICATIONS
Bridge amplifiers
Pressure measurement
Medical instrumentation
Portable data acquisition
Multichannel systems
Wide Supply Range, Micropower,
Rail-to-Rail Instrumentation Amplifier
AD8420
PIN CONFIGURATION
AD8420
NC 1
+IN 2
–IN 3
–VS 4
+–
–+
TOP VIEW
(Not to Scale)
8 VOUT
7 FB
6 REF
5 +VS
Figure 1.
Table 1. Instrumentation Amplifiers by Category1
General
Purpose
Zero Drift
Military Low
Grade Power
AD8221, AD8222 AD8231
AD620 AD8420
AD8220, AD8224 AD8290
AD621 AD8235
AD8236
AD8226, AD8227 AD8293G80, AD524 AD627
AD8293G160
AD8228
AD8553
AD526 AD8226
AD8227
AD8295, AD8224 AD8556
AD624 AD623
AD8557
AD8223
Digital
Gain
AD8250
AD8251
AD8253
AD8231
1 See www.analog.com for the latest instrumentation amplifiers.
GENERAL DESCRIPTION
The AD8420 is a low cost, micropower, wide supply range,
instrumentation amplifier with a rail-to-rail output and a novel
architecture that allows for extremely flexible design. It is optimized
to amplify small differential voltages in the presence of large
common-mode signals.
The AD8420 is based on an indirect current feedback architecture
that gives it an excellent input common-mode range. Unlike
conventional instrumentation amplifiers, the AD8420 can easily
amplify signals at or even slightly below ground without requiring
dual supplies. The AD8420 has rail-to-rail output, and the output
voltage swing is completely independent of the input common-
mode voltage.
Single-supply operation, micropower current consumption, and
rail-to-rail output swing make the AD8420 ideal for battery-
powered applications. Its rail-to-rail output stage maximizes
dynamic range when operating from low supply voltages. Dual-
supply operation (±15 V) and low power consumption make
the AD8420 ideal for a wide variety of applications in medical
or industrial instrumentation.
The AD8420 is available in an 8-lead MSOP package. Performance
is specified over the full temperature range of −40°C to +85°C,
and the device is operational from −40°C to +125°C.
Rev. A
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 ©2012–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
AD8420
Data Sheet
Parameter
GAIN2
Gain Range
Gain Error
G=1
G = 10 to 1000
Gain vs. Temperature
OUTPUT
Output Swing
Short-Circuit Current
POWER SUPPLY
Operating Range
Quiescent Current
TEMPERATURE RANGE
Specified
Operational4
Test Conditions/Comments
G = 1 + (R2/R1)
VOUT = 0.1 V to 1.1 V, VREF = 0.1 V
VOUT = 0.2 V to 4.8 V
TA = −40°C to +85°C
VS = 5 V, RL = 10 kΩ to midsupply
VS = ±5 V, RL = 20 kΩ to ground
TA = +25°C
TA = +85°C
TA = −40°C
Single-supply operation3
VS = 5 V
TA = +25°C
TA = +85°C
TA = −40°C
Min Typ
1
0.05
−VS + 0.1
−VS + 0.1
−VS + 0.1
10
2.7
55 70
−40
−40
Max
1000
0.02
0.1
10
Unit
V/V
%
%
ppm/°C
+VS − 0.15
+VS − 0.2
+VS − 0.15
V
V
V
mA
36 V
90 μA
110 μA
75 μA
+85
+125
°C
°C
1 The input stage uses PNP transistors; therefore, input bias current always flows out of the device.
2 For G > 1, errors from External Resistor R1 and External Resistor R2 should be considered in addition to these specifications, including error from FB pin bias current.
3 Minimum supply voltage indicated for V+IN, V−IN, and VREF = 0 V.
4 See the Typical Performance Characteristics section for operation between 85°C and 125°C.
Rev. A | Page 4 of 26
5 Page 
AD8420
3.0
VS = +5V
G=1
2.5
V–IN = 0V
VREF = 0V
2.0
1.5
VOUT
IIN
0.5
0.4
0.3
0.2
1.0 0.1
0.5 0
0
–5 0
–0.1
5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
Figure 9. Input Overvoltage Performance, G = 1
3
VS = ±15V
G=1
2
VOUT
0.6
0.4
IIN
1 0.2
00
–1 –0.2
–2 –0.4
–3
–20 –15 –10
–5
0
–0.6
5 10 15 20 25
INPUT VOLTAGE (V)
Figure 10. Input Overvoltage Performance, G = 1, VS = ±15 V
6 0.5
5 VOUT 0.4
IIN
4 0.3
3
VS = 5V
2
G = 100
V–IN = 0V
VREF = 0V
1
0.2
0.1
0
0
–5 0
–0.1
5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
Figure 11. Input Overvoltage Performance, G = 100
Data Sheet
15
VS = ±15V
G = 100
0.6
10 0.4
VOUT
IIN
5 0.2
00
–5 –0.2
–10 –0.4
–15
–20 –15 –10
–5
0
–0.6
5 10 15 20 25
INPUT VOLTAGE (V)
Figure 12. Input Overvoltage Performance, G = 100, VS = ±15 V
15
–1.0V, +12.3V
0.0V, +12.8V
+1.0V, +12.3V
10
5
0
MAXIMUM VDIFF = ±1V
–5
–10
–1.0V, –14.6V
–15
+1.0V, –14.6V
0.0V, –15.1V
–20
–1.2 –1.0 –0.8 –0.6 –0.4 –0.2 0 0.2 0.4 0.6 0.8 1.0 1.2
OUTPUT VOLTAGE (V)
Figure 13. Input Common-Mode Voltage vs. Output Voltage,
G = 1, VS = ±15 V
3.0
2.5 +4mV, +2.8V
2.0
+1.0V, +2.3V
1.5
MAXIMUM VDIFF = ±1V
1.0
0.5
+4mV, –0.1V
0
+1.0V, +0.4V
–0.5
–0.2
0
0.2 0.4 0.6 0.8 1.0 1.2
OUTPUT VOLTAGE (V)
Figure 14. Input Common-Mode Voltage vs. Output Voltage,
G = 1, VS = 5 V, VREF = 0 V
Rev. A | Page 10 of 26
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet AD8420.PDF ] | |
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