Data Sheet
FEATURES
Easy to use
Rail-to-rail output swing
Input voltage range extends 150 mV below ground
(single supply)
Low power, 550 µA maximum supply current
Gain set with one external resistor
Gain range: 1 to 1000
High accuracy dc performance
0.10% gain accuracy (G = 1)
0.35% gain accuracy (G > 1)
Noise: 35 nV/√Hz RTI noise at 1 kHz
Excellent dynamic specifications
800 kHz bandwidth (G = 1)
20 µs settling time to 0.01% (G = 10)
Single and Dual-Supply, Rail-to-Rail,
Low Cost Instrumentation Amplifier
AD623
GENERAL DESCRIPTION
The
AD623
is an integrated, single- or dual-supply instrumentation
amplifier that delivers rail-to-rail output swing using supply
voltages from 3 V to 12 V. The
AD623
offers superior user
flexibility by allowing single gain set resistor programming and by
conforming to the 8-lead industry standard pinout configuration.
With no external resistor, the
AD623
is configured for unity
gain (G = 1), and with an external resistor, the
AD623
can be
programmed for gains of up to 1000.
The superior accuracy of the
AD623
is the result of increasing
ac common-mode rejection ratio (CMRR) coincident with
increasing gain; line noise harmonics are rejected due to
constant CMRR up to 200 Hz. The
AD623
has a wide input
common-mode range and amplifies signals with common-
mode voltages as low as 150 mV below ground. The
AD623
maintains superior performance with dual and single polarity
power supplies.
Table 1. Low Power Upgrades for the
AD623
Part No.
AD8235
AD8236
AD8237
AD8226
AD8227
AD8420
AD8422
AD8426
Total V
S
(V dc)
5.5
5.5
5.5
36
36
36
36
36
Typical I
Q
(µA)
30
33
33
350
325
85
300
325 (per channel)
APPLICATIONS
Low power medical instrumentation
Transducer interfaces
Thermocouple amplifiers
Industrial process controls
Difference amplifiers
Low power data acquisition
FUNCTIONAL BLOCK DIAGRAM
2
–IN
V
DIFF
2
V
CM
V
DIFF
2
+IN
3
4
–V
S
A2
–
+
–
+
+V
S
7
A1
–R
G
R
G
1
8
+R
G
REF
00778-054
50kΩ
50kΩ
50kΩ
A3
50kΩ
6
OUTPUT
50kΩ
50kΩ
5
Figure 1.
Rev. F
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AD623
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Single Supply ................................................................................. 3
Dual Supplies ................................................................................ 5
Specifications Common to Dual and Single Supplies ............. 7
Absolute Maximum Ratings............................................................ 8
ESD Caution .................................................................................. 8
Pin Configuration and Function Descriptions ............................. 9
Typical Performance Characteristics ........................................... 10
Theory of Operation ...................................................................... 17
Data Sheet
Applications Information .............................................................. 18
Basic Connection ....................................................................... 18
Gain Selection ............................................................................. 18
Reference Terminal .................................................................... 18
Input and Output Offset Voltage Error ................................... 19
Input Protection ......................................................................... 19
RF Interference ........................................................................... 19
Grounding ................................................................................... 20
Input Differential and Common-Mode Range vs.
Supply and Gain ......................................................................... 22
Additional Information ............................................................. 23
Evaluation Board ............................................................................ 24
General Description ................................................................... 24
Outline Dimensions ....................................................................... 25
Ordering Guide .......................................................................... 26
REVISION HISTORY
4/2018—Rev. E to Rev. F
Changes to Gain Error Parameter, Nonlinearity Parameter,
Offset Referred to the Input vs. Supply (PSR) Parameter, and
Output Swing Parameter, Table 2 ................................................... 3
Changes to Gain Error Parameter and Offset Referred to the
Input vs. Supply (PSR) Parameter, Table 3 .................................... 5
Changes to Current Noise Parameter, Table 4 .............................. 7
Changes to Ordering Guide .......................................................... 26
6/2016—Rev. D to Rev. E
Changes to Features Section, General Description Section,
and Figure 1 ....................................................................................... 1
Deleted Connection Diagram Section ........................................... 1
Added Functional Block Diagram Section and Table 1;
Renumbered Sequentially................................................................ 1
Changes to Single Supply Section................................................... 3
Changes to Table 3 ............................................................................ 6
Changed Both Dual and Single Supplies Section to
Specifications Common to Dual and Single Supplies Section ... 7
Changes to Table 5 ............................................................................ 8
Added Pin Configuration and Function Descriptions Section,
Figure 2, and Table 6; Renumbered Sequentially ......................... 9
Changes to Figure 5 Caption, Figure 6 Caption, and
Figure 8 Caption ............................................................................. 10
Changes to Figure 17 Caption through Figure 20 Caption ....... 11
Changes to Figure 21 Caption through Figure 26 Caption ...... 12
Changes to Figure 27 Caption and Figure 28 Caption .............. 13
Changes to Theory of Operation Section.................................... 17
Changes to Basic Connection Section ......................................... 18
Changes to Input and Output Offset Voltage Error Section, and
Input Protection Section................................................................ 19
Added Additional Information Section ...................................... 23
Added Evaluation Board Section and Figure 56 ........................ 24
Updated Outline Dimensions ....................................................... 25
Changes to Ordering Guide .......................................................... 26
7/2008—Rev. C to Rev. D
Updated Format .................................................................. Universal
Changes to Features Section and General Description Section ..1
Changes to Table 3.............................................................................6
Changes to Figure 40...................................................................... 14
Changes to Theory of Operation Section.................................... 15
Changes to Figure 42 and Figure 43............................................. 16
Changes to Table 7.......................................................................... 19
Updated Outline Dimensions ....................................................... 22
Changes to Ordering Guide .......................................................... 23
9/1999—Rev. B to Rev. C
Rev. F | Page 2 of 26