ad8426 Analog Devices, Inc., ad8426 Datasheet

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ad8426

Manufacturer Part Number
ad8426
Description
Wide Supply Range, Rail-to-rail Output Instrumentation Amplifier
Manufacturer
Analog Devices, Inc.
Datasheet
Preliminary Technical Data
FEATURES
2 channels in a small, 4 mm × 4 mm LFCSP
LFCSP package has no metal pad
Gain set with 1 external resistor
Input voltage goes below ground
Inputs protected beyond supplies
Very wide power supply range
Bandwidth (G = 1): 1.5 MHz
CMRR (G = 1): 80 dB minimum
Input noise: 22 nV/√Hz
Typical supply current (per amp): 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
instrumentation amplifier that requires only one external
resistor to set any gain from 1 to 1000.
The
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 also includes the ability to go below the negative supply,
small signals near ground can be amplified without requiring
dual supplies. The
±1.35 V to ±18 V for dual supplies and 2.2 V to 36 V for single
supply.
The robust
world sensors. In addition to its wide operating range, the
AD8426
with a ±5 V supply, the part is guaranteed to withstand ±35 V
at the input with no damage. Minimum as well as maximum input
Rev. PrD
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.
Trademarks and registered trademarks are the property of their respective owners.
More routing room
No current leakage to pad
Gain range: 1 to 1000
Single supply: 2.2 V to 36 V
Dual supply: ±1.35 V to ±18 V
AD8426
AD8426
can handle voltages beyond the rails. For example,
AD8426
is a dual channel, low cost, wide supply range
is designed to work with a variety of signal
AD8426
inputs are designed to connect to real-
operates on supplies ranging from
Output Instrumentation Amplifier
Wide Supply Range, Rail-to-Rail
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
Table 1. Instrumentation Amplifiers by Category
General
Purpose
AD8220
AD8221
AD8222
AD8224
AD8228
AD8295
1
bias currents are specified to facilitate open-wire detection.
The
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
have an exposed metal pad on the back of the part, which frees
additional space for routing and vias. The
amps in the equivalent board space of a typical MSOP package.
The
industrial applications. Unlike other low cost, low power
instrumentation amplifiers, the
minimum gain of 1 and can easily handle ±10 V signals. With
its space-saving LFCSP package and 125°C temperature rating,
the
The
See
AD8426
AD8426
AD8426
AD8226
www.analog.com
thrives in tightly packed, zero airflow designs.
is designed to make PCB routing easy and
is ideal for multichannel, space-constrained
is the single channel version of the AD8426.
Zero
Drift
AD8231
AD8290
AD8293
AD8553
AD8556
AD8557
–IN1
+IN1
RG1
RG1
PIN CONFIGURATION
1
2
3
4
for the latest instrumentation amplifiers.
AD8426
©2011 Analog Devices, Inc. All rights reserved.
Military
Grade
AD620
AD621
AD524
AD526
AD624
16
5
15
Figure 1.
6
14
7
AD8426
13
8
Low
Power
AD627
AD623
AD8235
AD8236
AD8426
AD8226
AD8227
is designed with a
12
11
10
9
AD8426
AD8426
–IN2
RG2
RG2
+IN2
AD8426
www.analog.com
High Speed
PGA
AD8250
AD8251
AD8253
does not
offers two in
1

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ad8426 Summary of contents

Page 1

... 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.461.3113 ©2011 Analog Devices, Inc. All rights reserved. AD8426 ...

Page 2

... AD8426 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Pin Configuration ............................................................................. 1 General Description ......................................................................... 1 Specifications ..................................................................................... 3 Dual-Supply Operation ............................................................... 3 Single-Supply Operation ............................................................. 5 Absolute Maximum Ratings ............................................................ 8 Thermal Resistance ...................................................................... 8 ESD Caution .................................................................................. 8 Pin Configuration and Function Descriptions ............................. 9 Typical Performance Characteristics ........................................... 10 Theory of Operation ...................................................................... 11 Architecture ................................................................................. 11 Preliminary Technical Data   Gain Selection .............................................................................. 11   Reference Terminal ..................................................................... 11   ...

Page 3

... AD8426 Unit nV/√Hz nV/√Hz μV p-p μV p-p μV p-p fA/√Hz pA p-p μV μV/°C μV μV/° pA/° ...

Page 4

... AD8426 Test Conditions/ Parameter Comments T = −40°C A Average Temperature T = −40°C to +125°C A Coefficient REFERENCE INPUT Voltage Range Reference Gain to Output Reference Gain Error DYNAMIC RESPONSE Small-Signal −3 dB Bandwidth 100 G = 1000 Settling Time 0.01 step ...

Page 5

... B Grade Max Min Typ Max 86 105 110 110 100 125 120 125 2 0.5 0.4 100 3 300 150 AD8426 Unit μA μA μA μA °C Unit nV/√Hz nV/√Hz μV p-p μV p-p μV p-p fA/√Hz pA p-p ...

Page 6

... AD8426 Test Conditions/ Parameter Comments Average Temperature T = −40°C to +125°C A Coefficient Output Offset, V OSO Average Temperature T = −40°C to +125°C A Coefficient Offset RTI vs. Supply (PSR 1 100 G = 1000 INPUT CURRENT 1 Input Bias Current T = +25° +125°C ...

Page 7

... S S − 0.9 −0.15 +V − 0 − 40 − − 0.1 0.1 +V − 0 2.2 36 325 400 250 325 425 500 475 550 −40 +125 AD8426 Unit GΩ||pF GΩ|| μA μA μA μA °C ...

Page 8

... AD8426 ABSOLUTE MAXIMUM RATINGS Table 4. Parameter Supply Voltage Output Short-Circuit Current Maximum Voltage at −INx or +INx Minimum Voltage at −INx or +INx REFx Voltage Storage Temperature Range Specified Temperature Range Maximum Junction Temperature ESD Human Body Model Charged Device Model Machine Model Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only ...

Page 9

... 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 AD8426 12 –IN2 –IN1 1 2 RG2 RG1 11 RG1 3 RG2 10 +IN1 4 9 +IN2 Figure 2. Pin Configuration Rev. PrD | Page AD8426 ...

Page 10

... AD8426 TYPICAL PERFORMANCE CHARACTERISTICS T = 25° ± kΩ, unless otherwise noted 2.50 +0.01, +1.90 +1.35, +1.95 2.00     1.50 +0.01, +1.28   1.00 +2.17, +0.90   0.50   +0.01, +0.31 0.00 ‐0.50 0.00, ‐0.45 +1.35, ‐0.41 ‐1.00 ‐ Output Voltage (V)     Figure 3. Input Common-Mode Voltage vs. Output Voltage, Single Supply ...

Page 11

... OUT IN+ IN− REF where: 49.4 kΩ  1  GAIN SELECTION Placing a resistor across the R terminals sets the gain of the G AD8426, which can be calculated by referring to Table using the following gain equation: 49.4 kΩ   NODE 4 – ...

Page 12

... Package Considerations ), differential input CM ) interact. The values The AD8426 REF , at different temper- no exposed paddle. The footprint from another 4 mm × LFCSP part should not be copied because it may not have the correct lead pitch and lead width dimensions. Refer to the Outline Dimensions section for the correct dimensions ...

Page 13

... C REF R –V S CAPACITIVELY COUPLED Figure 12. Creating an Input Bias Current Return Path has very robust inputs and typically does not AD8426 terminals should be kept within the AD8426 are protected against ESD. AD8426 CORRECT +V S AD8426 REF – AD8426 REF –V ...

Page 14

... affects the differential signal, and C D mode signal. Values of R and C RFI. Any mismatch between the R × C and the R × C AD8426. By using a value of C than C is improved. Rev. PrD | Page Preliminary Technical Data +V S 0.1µF 10µ 1nF ...

Page 15

... For best linearity and ac performance, a minimum positive supply voltage (+V supply voltage required for optimum performance where V CM_MAX –OUT expected at the input of the AD8426. Table 9. Minimum Positive Supply Voltage Temperature Less than −10°C − −10°C to +25°C IN+ IN− ...

Page 16

... REF AD8616 10nF Figure 16. Driving an ADC Rev. PrD | Page Preliminary Technical Data AD8426 AD8426 stable, the RC time AD8426 needs to AD8426 output stays within the ADC AD8616 simply buffers it. However fault AD8426 may go outside the supply AD8616 and the ADC ...

Page 17

... MAX 0.02 NOM COPLANARITY 0.35 0.08 0.30 0.20 REF 0.25 COMPLIANT TO JEDEC STANDARDS MO-263-VBBC Figure 17. 16-Lead Lead Frame Chips Scale Package [LFCSP_VQ × Body, Very Thin Quad, with Hidden Paddle (CP-16-19) Dimensions shown in millimeters Rev. PrD | Page 1.95 REF BOTTOM VIEW AD8426 ...

Page 18

... AD8426 NOTES Preliminary Technical Data Rev. PrD | Page ...

Page 19

... Preliminary Technical Data NOTES Rev. PrD | Page AD8426 ...

Page 20

... AD8426 NOTES ©2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. PR09490-0-6/11(PrD) Preliminary Technical Data Rev. PrD | Page ...

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