Precision Instrumentation Amplifier
AD524
Data Sheet
FEATURES
FUNCTIONAL BLOCK DIAGRAM
– INPUT 1
G = 10 13
G = 100 12
G = 1000 11
PROTECTION
AD524
4.44kΩ
404Ω
40Ω
Vb
RG1 16
20kΩ
20kΩ
20kΩ
20kΩ
SENSE
OUTPUT
RG2 3
+ INPUT 2
20kΩ
20kΩ
REFERENCE
00500-001
Low noise: 0.3 μV p-p at 0.1 Hz to 10 Hz
Low nonlinearity: 0.003% (G = 1)
High CMRR: 120 dB (G = 1000)
Low offset voltage: 50 μV
Low offset voltage drift: 0.5 μV/°C
Gain bandwidth product: 25 MHz
Pin programmable gains of 1, 10, 100, 1000
Input protection, power-on/power-off
No external components required
Internally compensated
MIL-STD-883B and chips available
16-lead ceramic DIP and SOIC packages and 20-terminal
leadless chip carrier available
Available in tape and reel in accordance with EIA-481A
standard
Standard military drawing also available
PROTECTION
Figure 1.
GENERAL DESCRIPTION
The AD524 is a precision monolithic instrumentation amplifier
designed for data acquisition applications requiring high accuracy under worst-case operating conditions. An outstanding
combination of high linearity, high common-mode rejection,
low offset voltage drift, and low noise makes the AD524 suitable
for use in many data acquisition systems. The AD524 has an
output offset voltage drift of less than 25 μV/°C, input offset
voltage drift of less than 0.5 μV/°C, CMR above 90 dB at unity
gain (120 dB at G = 1000), and maximum nonlinearity of
0.003% at G = 1. The gain bandwidth product of the AD524 is
25 kHz (G = 1000). The output slew rate of 5 V/μs and settling
time of 15 μs to 0.01% for gains of 1 to 100, makes it suitable for
high speed data acquisition systems.
As a complete amplifier, the AD524 does not require any external
components for fixed gains of 1, 10, 100, and 1000. For other
gain settings between 1 and 1000, only a single resistor is
required. The AD524 input is fully protected for both power-on
and power-off fault conditions. The AD524 is available in four
versions of accuracy and operating temperature range. The
economical A grade, the low drift B grade, and lower drift,
higher linearity C grade are specified from −25°C to +85°C. The
S grade guarantees performance to specification over the extended
temperature range −55°C to +125°C. The AD524 is available in a
16-lead ceramic DIP, 16-lead SBDIP, 16-lead SOIC wide
packages, and 20-terminal leadless chip carrier.
Rev. G
PRODUCT HIGHLIGHTS
1.
2.
3.
4.
5.
Guaranteed low offset voltage, low offset voltage drift, and
low noise for precision high gain applications.
Functionally complete with pin programmable gains of 1,
10, 100, and 1000, and single resistor-programmable for
any gain.
Input and output offset nulling terminals are provided for
high precision applications and to minimize offset voltage
changes in gain ranging applications.
Input protected for both power-on and power-off fault
conditions.
Superior dynamic performance with a gain bandwidth
product of 25 MHz, full power response of 75 kHz and a
settling time of 15 μs to 0.01% of a 20 V step (G = 100).
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Technical Support
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AD524
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Input Offset and Output Offset ................................................ 15
Functional Block Diagram .............................................................. 1
Gain .............................................................................................. 16
General Description ......................................................................... 1
Input Bias Currents .................................................................... 17
Product Highlights ........................................................................... 1
Common-Mode Rejection ........................................................ 17
Revision History ............................................................................... 2
Grounding ................................................................................... 18
Specifications..................................................................................... 3
Sense Terminal............................................................................ 18
Absolute Maximum Ratings............................................................ 8
Reference Terminal .................................................................... 18
Connection Diagrams .................................................................. 8
Programmable Gain ................................................................... 20
ESD Caution .................................................................................. 8
Auto-Zero Circuits ..................................................................... 20
Typical Performance Characteristics ............................................. 9
Error Budget Analysis ................................................................ 21
Test Circuits ................................................................................. 14
References .................................................................................... 23
Theory of Operation ...................................................................... 15
Outline Dimensions ....................................................................... 24
Input Protection.......................................................................... 15
Ordering Guide .......................................................................... 25
REVISION HISTORY
1/2018—Rev. F to Rev. G
Changes to General Description .................................................... 1
Change to Output Offset Voltage vs. Temperature Parameter,
Unit Column, Table 1 ....................................................................... 3
Added References Section ............................................................. 23
Updated Outline Dimensions ....................................................... 24
Changes to Ordering Guide .......................................................... 25
11/2007—Rev. E to Rev. F
Updated Format .................................................................. Universal
Changes to General Description .................................................... 1
Changes to Figure 1 .......................................................................... 1
Changes to Figure 3 and Figure 4 Captions .................................. 8
Changes to Error Budget Analysis Section ................................. 21
Changes to Ordering Guide .......................................................... 25
4/1999—Rev. D to Rev. E
Rev. G | Page 2 of 25
Data Sheet
AD524
SPECIFICATIONS
At VS = ±15 V, RL = 2 kΩ and TA = +25°C, unless otherwise noted.
All min and max specifications are guaranteed. Specifications shown in boldface are tested on all production units at the final electrical
test. Results from those tests are used to calculate outgoing quality levels.
Table 1.
Parameter
GAIN
Gain Equation (External Resistor Gain Programming)
Gain Range (Pin Programmable)
Gain Error 1
G=1
G = 10
G = 100
G = 1000
Nonlinearity
G=1
G = 10, G = 100
G = 1000
Gain vs. Temperature
G=1
G = 10
G = 100
G = 1000
VOLTAGE OFFSET (May be Nulled)
Input Offset Voltage
vs. Temperature
Output Offset Voltage
vs. Temperature
Offset Referred to the Input vs. Supply
G=1
G = 10
G = 100
G = 1000
INPUT CURRENT
Input Bias Current
vs. Temperature
Input Offset Current
vs. Temperature
Min
AD524A
Typ
Max
Min
AD524B
Typ
Max
40 ,000
+ 1 ± 20%
RG
40 ,000
+ 1 ± 20%
RG
1 to 1000
1 to 1000
±0.05
±0.25
±0.5
±2.0
±0.03
±0.15
±0.35
±1.0
%
%
%
%
±0.01
±0.01
±0.01
±0.005
±0.005
±0.01
%
%
%
5
15
35
100
5
10
25
50
ppm/°C
ppm/°C
ppm/°C
ppm/°C
250
2
5
100
100
0.75
3
50
µV
µV/°C
mV
µV/°C
70
85
95
100
dB
dB
dB
dB
75
95
105
110
±50
±100
±25
±100
±35
±100
Rev. G | Page 3 of 25
Unit
±15
±100
nA
pA/°C
nA
pA/°C
AD524
Data Sheet
Parameter
INPUT
Input Impedance
Differential Resistance
Differential Capacitance
Common-Mode Resistance
Common-Mode Capacitance
Input Voltage Range
Maximum Differential Input Linear (VDL) 2
Maximum Common-Mode Linear (VCM)2
Min
AD524A
Typ
Max
Min
109
10
109
10
±10
Unit
109
10
109
10
Ω
pF
Ω
pF
±10
G
12 V − × VD
2
G
12 V − × VD
2
Common-Mode Rejection DC to 60 Hz with 1 kΩ Source Imbalance
G=1
G = 10
G = 100
G = 1000
OUTPUT RATING
VOUT, RL = 2 kΩ
DYNAMIC RESPONSE
Small Signal – 3 dB
G=1
G = 10
G = 100
G = 1000
Slew Rate
Settling Time to 0.01%, 20 V Step
G = 1 to 100
G = 1000
NOISE
Voltage Noise, 1 kHz
RTI
RTO
RTI, 0.1 Hz to 10 Hz
G=1
G = 10
G = 100, 1000
Current Noise
0.1 Hz to 10 Hz
SENSE INPUT
RIN
IIN
Voltage Range
Gain to Output
REFERENCE INPUT
RIN
IIN
Voltage Range
Gain to Output
AD524B
Typ
Max
70
90
100
110
V
dB
dB
dB
dB
75
95
105
115
±10
±10
V
1
400
150
25
5.0
1
400
150
25
5.0
MHz
kHz
kHz
kHz
V/µs
15
75
15
75
µs
µs
7
90
7
90
nV/√Hz
nV√Hz
15
2
0.3
15
2
0.3
µV p-p
µV p-p
µV p-p
60
60
pA p-p
20
15
20
15
kΩ ± 20%
µA
V
%
±10
±10
1
1
40
15
40
15
±10
Rev. G | Page 4 of 25
V
V
±10
1
1
kΩ ± 20%
µA
V
%
Data Sheet
AD524
Parameter
TEMPERATURE RANGE
Specified Performance
Storage
POWER SUPPLY
Power Supply Range
Quiescent Current
1
2
Min
AD524A
Typ
Max
Min
AD524B
Typ
Max
–25
–65
+85
+150
–25
–65
+85
+150
°C
°C
±18
5.0
±6
±18
5.0
V
mA
±15
3.5
±6
±15
3.5
Unit
Does not include effects of external resistor, RG.
VOL is the maximum differential input voltage at G = 1 for specified nonlinearity.
VDL at the maximum = 10 V/G.
VD = actual differential input voltage.
Example: G = 10, VD = 0.50.
VCM = 12 V − (10/2 × 0.50 V) = 9.5 V.
At VS = ±15 V, RL = 2 kΩ and TA = +25°C, unless otherwise noted.
All min and max specifications are guaranteed. Specifications shown in boldface are tested on all production units at the final electrical
test. Results from those tests are used to calculate outgoing quality levels.
Table 2.
Parameter
GAIN
Gain Equation (External Resistor Gain Programming)
Gain Range (Pin Programmable)
Gain Error 1
G=1
G = 10
G = 100
G = 1000
Nonlinearity
G=1
G = 10, G = 100
G = 1000
Gain vs. Temperature
G=1
G = 10
G = 100
G = 1000
VOLTAGE OFFSET (May be Nulled)
Input Offset Voltage
vs. Temperature
Output Offset Voltage
vs. Temperature
Offset Referred to the Input vs. Supply
G=1
G = 10
G = 100
G = 1000
Min
AD524C
Typ
Max
Min
AD524S
Typ
Max
40 ,000
+ 1 ± 20%
RG
40 ,000
+ 1 ± 20%
RG
1 to 1000
1 to 1000
80
100
110
115
Rev. G | Page 5 of 25
Unit
±0.02
±0.1
±0.25
±0.5
±0.05
±0.25
±0.5
±2.0
%
%
%
%
±0.003
±0.003
±0.01
±0.01
±0.01
±0.01
%
%
%
5
10
25
50
5
10
25
50
ppm/°C
ppm/°C
ppm/°C
ppm/°C
50
0.5
2.0
25
100
2.0
3.0
50
µV
µV/°C
mV
µV
75
95
105
110
dB
dB
dB
dB
AD524
Data Sheet
Parameter
INPUT CURRENT
Input Bias Current
vs. Temperature
Input Offset Current
vs. Temperature
INPUT
Input Impedance
Differential Resistance
Differential Capacitance
Common-Mode Resistance
Common-Mode Capacitance
Input Voltage Range
Maximum Differential Input Linear (VDL) 2
Maximum Common-Mode Linear (VCM)2
AD524C
Typ
Max
Min
Min
AD524S
Typ
Max
±100
±100
nA
pA/°C
nA
pA/°C
109
10
109
10
109
10
109
10
Ω
pF
Ω
pF
±15
±50
±100
±100
±10
±10
±35
±10
G
12 V − × VD
2
Common-Mode Rejection DC to 60 Hz with 1 kΩ Source Imbalance
G=1
G = 10
G = 100
G = 1000
OUTPUT RATING
VOUT, RL = 2 kΩ
DYNAMIC RESPONSE
Small Signal – 3 dB
G=1
G = 10
G = 100
G = 1000
Slew Rate
Settling Time to 0.01%, 20 V Step
G = 1 to 100
G = 1000
NOISE
Voltage Noise, 1 kHz
RTI
RTO
RTI, 0.1 Hz to 10 Hz
G=1
G = 10
G = 100, 1000
Current Noise
0.1 Hz to 10 Hz
SENSE INPUT
RIN
IIN
Voltage Range
Gain to Output
80
100
110
120
G
12 V − × VD
2
V
V
V
dB
dB
dB
dB
70
90
100
110
±10
±10
V
1
400
150
25
5.0
1
400
150
25
5.0
MHz
kHz
kHz
kHz
V/µs
15
75
15
75
µs
µs
7
90
7
90
nV/√Hz
nV√Hz
15
2
0.3
15
2
0.3
µV p-p
µV p-p
µV p-p
60
60
pA p-p
20
15
20
15
kΩ ± 20%
µA
V
%
±10
Rev. G | Page 6 of 25
Unit
±10
1
1
Data Sheet
AD524
Parameter
REFERENCE INPUT
RIN
IIN
Voltage Range
Gain to Output
TEMPERATURE RANGE
Specified Performance
Storage
POWER SUPPLY
Power Supply Range
Quiescent Current
1
2
Min
AD524C
Typ
Max
Min
40
15
40
15
10
–25
–65
Does not include effects of external resistor RG.
VOL is the maximum differential input voltage at G = 1 for specified nonlinearity.
VDL at the maximum = 10 V/G.
VD = actual differential input voltage.
Example: G = 10, VD = 0.50.
VCM = 12 V − (10/2 × 0.50 V) = 9.5 V.
Rev. G | Page 7 of 25
±15
3.5
1
+85
+150
–55
–65
±18
5.0
±6
±15
3.5
Unit
kΩ ± 20%
µA
V
%
10
1
±6
AD524S
Typ
Max
+85
+150
°C
°C
±18
5.0
V
mA
AD524
Data Sheet
ABSOLUTE MAXIMUM RATINGS
CONNECTION DIAGRAMS
– INPUT 1
16
RG1
+ INPUT 2
15
OUTPUT NULL
14
OUTPUT NULL
RG2 3
G = 10
TOP VIEW
INPUT NULL 5 (Not to Scale) 12 G = 100