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PDF AD8426 Data sheet ( Hoja de datos )
| Número de pieza | AD8426 | |
| Descripción | Rail-to-Rail Output Instrumentation Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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1. AD8426  Hay una vista previa y un enlace de descarga de AD8426 (archivo pdf) en la parte inferior de esta página. Total 29 Páginas | ||
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Wide Supply Range, Rail-to-Rail
Output Instrumentation Amplifier
AD8426
FEATURES
2 channels in a small, 4 mm × 4 mm LFCSP
LFCSP package has no metal pad
More routing room
No current leakage to pad
Gain set with 1 external resistor
Gain range: 1 to 1000
Input voltage goes below ground
Inputs protected beyond supplies
Very wide power supply range
Single supply: 2.2 V to 36 V
Dual supply: ±1.35 V to ±18 V
Bandwidth (G = 1): 1 MHz
CMRR (G = 1): 80 dB minimum
Input noise: 24 nV/√Hz
Typical supply current (per amplifier): 350 μA
Specified temperature range: −40°C to +125°C
APPLICATIONS
Industrial process controls
Bridge amplifiers
Medical instrumentation
Portable data acquisition
Multichannel systems
GENERAL DESCRIPTION
The AD8426 is a dual-channel, low cost, wide supply range
instrumentation amplifier that requires only one external
resistor to set any gain from 1 to 1000.
The AD8426 is designed to work with a variety of signal
voltages. A wide input range and rail-to-rail output allow the
signal to make full use of the supply rails. Because the input
range can also go below the negative supply, small signals near
ground can be amplified without requiring dual supplies. The
AD8426 operates on supplies ranging from ±1.35 V to ±18 V
for dual supplies and 2.2 V to 36 V for a single supply.
The robust AD8426 inputs are designed to connect to real-
world sensors. In addition to its wide operating range, the
AD8426 can handle voltages beyond the rails. For example,
with a ±5 V supply, the part is guaranteed to withstand ±35 V
at the input with no damage. Minimum and maximum input
bias currents are specified to facilitate open-wire detection.
CONNECTION DIAGRAM
16 15 14 13
AD8426
–IN1 1
RG1 2
RG1 3
+IN1 4
12 –IN2
11 RG2
10 RG2
9 +IN2
5678
Figure 1.
Table 1. Instrumentation Amplifiers by Category1
General- Zero
Purpose Drift
Military
Grade
Low
Power
High Speed
PGA
AD8220 AD8231 AD620
AD627
AD8250
AD8221 AD8290 AD621
AD623
AD8251
AD8222 AD8293 AD524
AD8235 AD8253
AD8224 AD8553 AD526
AD8236
AD8228 AD8556 AD624
AD8426
AD8295 AD8557
AD8226
AD8227
1 See www.analog.com for the latest instrumentation amplifiers.
The AD8426 is designed to make PCB routing easy and efficient.
The two amplifiers are arranged in a logical way so that typical
application circuits have short routes and few vias. Unlike most
chip scale packages, the AD8426 does not have an exposed metal
pad on the bottom of the part, which frees additional space for
routing and vias. The AD8426 offers two in-amps in the equivalent
board space of a typical MSOP package.
The AD8426 is ideal for multichannel, space-constrained industrial
applications. Unlike other low cost, low power instrumentation
amplifiers, the AD8426 is designed with a minimum gain of 1 and
can easily handle ±10 V signals. With its space-saving LFCSP
package and 125°C temperature rating, the AD8426 thrives in
tightly packed, zero airflow designs.
The AD8226 is the single-channel version of the AD8426.
Rev. 0
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
www.analog.com
Fax: 781.461.3113
©2011 Analog Devices, Inc. All rights reserved.
1 page  
AD8426
Parameter
REFERENCE INPUT
RIN
IIN
Voltage Range
Reference Gain to Output
Reference Gain Error
GAIN
Gain Range
Gain Error
G=1
G = 5 to 1000
Gain Nonlinearity
G = 1 to 10
G = 100
G = 1000
Gain vs. Temperature2
G=1
G>1
INPUT
Input Impedance
Differential
Common Mode
Input Operating Voltage
Range3
Input Overvoltage Range
OUTPUT
Output Swing
RL = 2 kΩ to Ground
RL = 10 kΩ to Ground
RL = 100 kΩ to Ground
Short-Circuit Current
POWER SUPPLY
Operating Range
Quiescent Current
(Per Amplifier)
TEMPERATURE RANGE
Test Conditions/
Comments
G = 1 + (49.4 kΩ/RG)
VOUT ± 10 V
VOUT = −10 V to +10 V
RL ≥ 2 kΩ
RL ≥ 2 kΩ
RL ≥ 2 kΩ
TA = −40°C to +85°C
TA = +85°C to +125°C
TA = −40°C to +125°C
VS = ±1.35 V to +36 V
TA = +25°C
TA = +125°C
TA = −40°C
TA = −40°C to +125°C
A Grade
Min Typ Max
B Grade
Min Typ Max
Unit
100 100 kΩ
7 7 μA
−VS +VS −VS +VS V
1 1 V/V
0.01 0.01 %
1
1000
1
1000
V/V
0.04 0.01 %
0.3 0.1 %
20 20 ppm
75 75 ppm
750 750 ppm
5
5
−100
1
2
−100
ppm/°C
ppm/°C
ppm/°C
−VS − 0.1
0.8||2
0.4||2
−VS − 0.05
−VS − 0.15
+VS − 40
+VS − 0.8
−VS − 0.1
0.8||2
0.4||2
+VS − 0.6
+VS − 0.9
−VS + 40
−VS − 0.05
−VS − 0.15
+VS − 40
+VS − 0.8
GΩ||pF
GΩ||pF
V
+VS − 0.6
+VS − 0.9
−VS + 40
V
V
V
TA = +25°C
TA = +125°C
TA = −40°C
TA = +25°C
TA = +125°C
TA = −40°C
TA = −40°C to +125°C
−VS + 0.4
−VS + 0.4
−VS + 1.2
−VS + 0.2
−VS + 0.3
−VS + 0.2
−VS + 0.1
13
Dual-supply operation
TA = +25°C
TA = −40°C
TA = +85°C
TA = +125°C
±1.35
−40
350
250
450
525
+VS − 0.7
+VS − 1.0
+VS − 1.1
+VS − 0.2
+VS − 0.3
+VS − 0.2
+VS − 0.1
−VS + 0.4
−VS + 0.4
−VS + 1.2
−VS + 0.2
−VS + 0.3
−VS + 0.2
−VS + 0.1
13
±18
425
325
525
600
+125
±1.35
−40
350
250
450
525
+VS − 0.7
+VS − 1.0
+VS − 1.1
+VS − 0.2
+VS − 0.3
+VS − 0.2
+VS − 0.1
V
V
V
V
V
V
V
mA
±18
425
325
525
600
+125
V
μA
μA
μA
μA
°C
1 The input stage uses PNP transistors; therefore, input bias current always flows into the part.
2 The values specified for G > 1 do not include the effects of the external gain-setting resistor, RG.
3 Input voltage range of the AD8426 input stage. The input range depends on the common-mode voltage, the differential voltage, the gain, and the reference voltage.
See the Input Voltage Range section for more information.
Rev. 0 | Page 4 of 28
5 Page 
AD8426
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
16 15 14 13
AD8426
–IN1 1
RG1 2
RG1 3
+IN1 4
12 –IN2
11 RG2
10 RG2
9 +IN2
5678
Figure 2. Pin Configuration
Table 10. Pin Function Descriptions
Pin No.
Mnemonic Description
1
−IN1
Negative Input, In-Amp 1
2 RG1 Gain-Setting Resistor Terminal, In-Amp 1
3 RG1 Gain-Setting Resistor Terminal, In-Amp 1
4
+IN1
Positive Input, In-Amp 1
5 +VS Positive Supply
6
REF1
Reference Adjust, In-Amp 1
7
REF2
Reference Adjust, In-Amp 2
8 −VS Negative Supply
9
+IN2
Positive Input, In-Amp 2
10 RG2 Gain-Setting Resistor Terminal, In-Amp 2
11 RG2 Gain-Setting Resistor Terminal, In-Amp 2
12
−IN2
Negative Input, In-Amp 2
13 −VS Negative Supply
14
OUT2
Output, In-Amp 2
15
OUT1
Output, In-Amp 1
16 +VS Positive Supply
Rev. 0 | Page 10 of 28
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet AD8426.PDF ] | |
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