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Analog Devices Semiconductor Electronic Components Datasheet



AD624

Precision Instrumentation Amplifier


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AD624 pdf
a
FEATURES
Low Noise: 0.2 V p-p 0.1 Hz to 10 Hz
Low Gain TC: 5 ppm max (G = 1)
Low Nonlinearity: 0.001% max (G = 1 to 200)
High CMRR: 130 dB min (G = 500 to 1000)
Low Input Offset Voltage: 25 V, max
Low Input Offset Voltage Drift: 0.25 V/؇C max
Gain Bandwidth Product: 25 MHz
Pin Programmable Gains of 1, 100, 200, 500, 1000
No External Components Required
Internally Compensated
Precision
Instrumentation Amplifier
AD624
FUNCTIONAL BLOCK DIAGRAM
–INPUT
G = 100
G = 200
G = 500
RG1
RG2
+INPUT
50
225.3
4445.7
124
80.2
50
AD624
VB 10k
20k
20k
10k
10k
10k
SENSE
OUTPUT
REF
PRODUCT DESCRIPTION
The AD624 is a high precision, low noise, instrumentation
amplifier designed primarily for use with low level transducers,
including load cells, strain gauges and pressure transducers. An
outstanding combination of low noise, high gain accuracy, low
gain temperature coefficient and high linearity make the AD624
ideal for use in high resolution data acquisition systems.
The AD624C has an input offset voltage drift of less than
0.25 µV/°C, output offset voltage drift of less than 10 µV/°C,
CMRR above 80 dB at unity gain (130 dB at G = 500) and a
maximum nonlinearity of 0.001% at G = 1. In addition to these
outstanding dc specifications, the AD624 exhibits superior ac
performance as well. A 25 MHz gain bandwidth product, 5 V/µs
slew rate and 15 µs settling time permit the use of the AD624 in
high speed data acquisition applications.
The AD624 does not need any external components for pre-
trimmed gains of 1, 100, 200, 500 and 1000. Additional gains
such as 250 and 333 can be programmed within one percent
accuracy with external jumpers. A single external resistor can
also be used to set the 624’s gain to any value in the range of 1
to 10,000.
PRODUCT HIGHLIGHTS
1. The AD624 offers outstanding noise performance. Input
noise is typically less than 4 nV/Hz at 1 kHz.
2. The AD624 is a functionally complete instrumentation am-
plifier. Pin programmable gains of 1, 100, 200, 500 and 1000
are provided on the chip. Other gains are achieved through
the use of a single external resistor.
3. The offset voltage, offset voltage drift, gain accuracy and gain
temperature coefficients are guaranteed for all pretrimmed
gains.
4. The AD624 provides totally independent input and output
offset nulling terminals for high precision applications.
This minimizes the effect of offset voltage in gain ranging
applications.
5. A sense terminal is provided to enable the user to minimize
the errors induced through long leads. A reference terminal is
also provided to permit level shifting at the output.
REV. C
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999



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AD624 pdf
AD624–SPECIFICATIONS (@ VS = ؎15 V, RL = 2 kand TA = +25؇C, unless otherwise noted)
Model
GAIN
Gain Equation
(External Resistor Gain
Programming)
AD624A
Min Typ Max
AD624B
Min Typ Max
AD624C
Min Typ Max
AD624S
Min Typ Max
Units
40, 000
 RG
+ 1± 20%
40, 000
 RG
+ 1± 20%
40, 000
 RG
+ 1± 20%
40, 000
 RG
+ 1± 20%
Gain Range (Pin Programmable)
Gain Error
G=1
G = 100
G = 200, 500
Nonlinearity
G=1
G = 100, 200
G = 500
Gain vs. Temperature
G=1
G = 100, 200
G = 500
1 to 1000
VOLTAGE OFFSET (May be Nulled)
Input Offset Voltage
vs. Temperature
Output Offset Voltage
vs. Temperature
OOffUsTet Referred to the Input vs. Supply
G=1
G = 100, 200
G = 500
70
95
100
±0.05
±0.25
±0.5
± 0.005
± 0.005
± 0.005
5
10
25
1 to 1000
200
2
5
50
75
105
110
±0.03
±0.15
±0.35
± 0.003
± 0.003
± 0.005
5
10
15
1 to 1000
75
0.5
3
25
80
110
115
1 to 1000
±0.02
±0.1
±0.25
± 0.001
± 0.001
± 0.005
5
10
15
25
0.25
2
10
75
105
110
±0.05
±0.25
±0.5
%
%
%
± 0.005 %
± 0.005 %
± 0.005 %
5 ppm/°C
10 ppm/°C
15 ppm/°C
75 µV
2.0 µV/°C
3 mV
50 µV/°C
dB
dB
dB
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 Range1
Max Differ. Input Linear (VDL)
Max Common-Mode Linear (VCM)
Common-Mode Rejection dc
to 60 Hz with 1 kSource Imbalance
G=1
G = 100, 200
G = 500
±50
± 50
±35
± 20
109
10
109
10
± 10
12
V

G
2
×
VD

70
100
110
±25
± 50
±15
± 20
109
10
109
10
± 10
12
V

G
2
×
VD

75
105
120
±15
± 50
±10
± 20
±50 nA
± 50 pA/°C
±35 nA
± 20 pA/°C
109
10
109
10
± 10
12
V

G
2
×
VD

109
10
109
10
± 10
12
V

G
2
×
VD

80 70
110 100
130 110
pF
pF
V
V
dB
dB
dB
OUTPUT RATING
V , RL = 2 k
± 10 ± 10 ± 10 ± 10 V
DYNAMIC RESPONSE
Small Signal –3 dB
G=1
1 1 1 1 MHz
G = 100
150 150 150 150 kHz
G = 200
100 100 100 100 kHz
G = 500
50 50 50 50 kHz
G = 1000
25 25 25 25 kHz
Slew Rate
5.0 5.0 5.0 5.0 V/µs
Settling Time to 0.01%, 20 V Step
G = 1 to 200
15 15 15 15 µs
G = 500
35 35 35 35 µs
G = 1000
75 75 75 75 µs
NOISE
Voltage Noise, 1 kHz
R.T.I.
R.T.O.
4 4 4 4 nV/Hz
75 75 75 75 nV/Hz
R.T.I., 0.1 Hz to 10 Hz
G=1
10 10 10 10 µV p-p
G = 100
0.3 0.3 0.3 0.3 µV p-p
G = 200, 500, 1000 0.2 0.2 0.2 0.2 µV p-p
Current Noise
0.1 Hz to 10 Hz
60 60 60 60 pA p-p
SENSE INPUT
RIN
IIN
Voltage Range
Gain to Output
8 10
30
± 10
1
12
8 10
30
± 10
1
12
8 10 12 8 10 12 k
30 30 µA
± 10 ± 10 V
1 1%
–2– REV. C



Part Number AD624
Description Precision Instrumentation Amplifier
Maker Analog Devices - Analog Devices
Total Page 15 Pages
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