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PDF AD524 Data sheet ( Hoja de datos )
| Número de pieza | AD524 | |
| Descripción | Precision Instrumentation Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
Precision
Instrumentation Amplifier
AD524
FEATURES
Low Noise: 0.3 V p-p 0.1 Hz to 10 Hz
Low Nonlinearity: 0.003% (G = 1)
High CMRR: 120 dB (G = 1000)
Low Offset Voltage: 50 V
Low Offset Voltage Drift: 0.5 V/؇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 Carriers Available
Available in Tape and Reel in Accordance
with EIA-481A Standard
Standard Military Drawing Also Available
PRODUCT DESCRIPTION
The AD524 is a precision monolithic instrumentation amplifier
designed for data acquisition applications requiring high accu-
racy 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 non-
linearity of 0.003% at G = 1. In addition to the outstanding dc
specifications, the AD524 also has a 25 kHz gain bandwidth
product (G = 1000). To make it suitable for high speed data
acquisition systems the AD524 has an output slew rate of 5 V/µs
and settles in 15 µs to 0.01% for gains of 1 to 100.
As a complete amplifier the AD524 does not require any exter-
nal 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 IC instrumentation amplifier is available in four
different 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. Devices
are available in 16-lead ceramic DIP and SOIC packages and a
20-terminal leadless chip carrier.
FUNCTIONAL BLOCK DIAGRAM
–INPUT
G = 10
G = 100
G = 1000
RG1
RG2
PROTECTION
4.44k⍀
404⍀
40⍀
+INPUT
PROTECTION
AD524
Vb 20k⍀
20k⍀ 20k⍀
20k⍀ 20k⍀
20k⍀
SENSE
VOUT
REFERENCE
PRODUCT HIGHLIGHTS
1. The AD524 has guaranteed low offset voltage, offset voltage
drift and low noise for precision high gain applications.
2. The AD524 is functionally complete with pin programmable
gains of 1, 10, 100 and 1000, and single resistor program-
mable for any gain.
3. Input and output offset nulling terminals are provided for
very high precision applications and to minimize offset volt-
age changes in gain ranging applications.
4. The AD524 is input protected for both power-on and power-
off fault conditions.
5. The AD524 offers 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).
REV. E
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
1 page  
20
15
10
+25؇C
5
0
0 5 10 15 20
SUPPLY VOLTAGE – ؎V
Figure 1. Input Voltage Range vs.
Supply Voltage, G = 1
AD524–Typical Characteristics
20 30
15
20
10
10
5
0
0 5 10 15 20
SUPPLY VOLTAGE – ؎V
Figure 2. Output Voltage Swing vs.
Supply Voltage
0
10 100 1k 10k
LOAD RESISTANCE – ⍀
Figure 3. Output Voltage Swing vs.
Load Resistance
8.0
6.0
4.0
2.0
0
0 5 10 15 20
SUPPLY VOLTAGE – ؎V
Figure 4. Quiescent Current vs.
Supply Voltage
16
14
12
10
8
6
4
2
0
0 5 10 15 20
SUPPLY VOLTAGE – ؎V
Figure 5. Input Bias Current vs.
Supply Voltage
40
30
20
10
0
–10
–20
–30
–40
–75 –25 25 75 125
TEMPERATURE – ؇C
Figure 6. Input Bias Current vs.
Temperature
16
14
12
10
8
6
4
2
0
0 5 10 15 20
INPUT VOLTAGE – ؎V
Figure 7. Input Bias Current vs. Input
Voltage
0
1
2
3
4
5
6
0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
WARM-UP TIME – Minutes
Figure 8. Offset Voltage, RTI, Turn
On Drift
1000
100
10
1
0 10 100 1k 10k 100k 1M 10M
FREQUENCY – Hz
Figure 9. Gain vs. Frequency
REV. E
–5–
5 Page 
AD524
acquisition components. Separate ground returns should be
provided to minimize the current flow in the path from the sensi-
tive points to the system ground point. In this way supply currents
and logic-gate return currents are not summed into the same
return path as analog signals where they would cause measure-
ment errors.
Since the output voltage is developed with respect to the poten-
tial on the reference terminal, an instrumentation amplifier can
solve many grounding problems.
ANALOG P.S.
+15V C –15V
DIGITAL P.S.
C +5V
0.1 0.1
F F
0.1 0.1
F F
1F 1F 1F
AD524
6
DIG
COM
AD583
SAMPLE
AND HOLD
AD574A
DIGITAL
DATA
OUTPUT
OUTPUT
REFERENCE
*ANALOG
GROUND
SIGNAL
GROUND
*IF INDEPENDENT; OTHERWISE RETURN AMPLIFIER REFERENCE
TO MECCA AT ANALOG P.S. COMMON
Figure 37. Basic Grounding Practice
SENSE TERMINAL
The sense terminal is the feedback point for the instrument
amplifier’s output amplifier. Normally it is connected to the
instrument amplifier output. If heavy load currents are to be
drawn through long leads, voltage drops due to current flowing
through lead resistance can cause errors. The sense terminal can
be wired to the instrument amplifier at the load, thus putting
the IxR drops “inside the loop” and virtually eliminating this
error source.
VIN +
VIN –
V+ (SENSE)
OUTPUT
CURRENT
BOOSTER
AD524
(REF)
X1
RL
V–
Figure 38. AD524 Instrumentation Amplifier with Output
Current Booster
Typically, IC instrumentation amplifiers are rated for a full ± 10
volt output swing into 2 kΩ. In some applications, however, the
need exists to drive more current into heavier loads. Figure 38
shows how a high-current booster may be connected “inside the
loop” of an instrumentation amplifier to provide the required
current boost without significantly degrading overall perfor-
mance. Nonlinearities, offset and gain inaccuracies of the buffer
are minimized by the loop gain of the IA output amplifier. Off-
set drift of the buffer is similarly reduced.
REFERENCE TERMINAL
The reference terminal may be used to offset the output by up
to ± 10 V. This is useful when the load is “floating” or does not
share a ground with the rest of the system. It also provides a
direct means of injecting a precise offset. It must be remem-
bered that the total output swing is ±10 volts to be shared be-
tween signal and reference offset.
When the IA is of the three-amplifier configuration it is neces-
sary that nearly zero impedance be presented to the reference
terminal.
Any significant resistance from the reference terminal to ground
increases the gain of the noninverting signal path, thereby upset-
ting the common-mode rejection of the IA.
In the AD524 a reference source resistance will unbalance the
CMR trim by the ratio of 20 kΩ/RREF. For example, if the refer-
ence source impedance is 1 Ω, CMR will be reduced to 86 dB
(20 kΩ/1 Ω = 86 dB). An operational amplifier may be used to
provide that low impedance reference point as shown in Figure
39. The input offset voltage characteristics of that amplifier will
add directly to the output offset voltage performance of the
instrumentation amplifier.
VIN +
+VS
SENSE
AD524
VIN –
REF
LOAD
–VS
AD711
VOFFSET
Figure 39. Use of Reference Terminal to Provide Output
Offset
An instrumentation amplifier can be turned into a voltage-to-
current converter by taking advantage of the sense and reference
terminals as shown in Figure 40.
+INPUT
SENSE
AD524
R1
VX IL
–INPUT
REF
A2
AD711
( )IL
=
VX
R1
=
VIN
R1
=
40,000
1+
RG
LOAD
Figure 40. Voltage-to-Current Converter
By establishing a reference at the “low” side of a current setting
resistor, an output current may be defined as a function of input
voltage, gain and the value of that resistor. Since only a small
current is demanded at the input of the buffer amplifier A2, the
forced current IL will largely flow through the load. Offset and
drift specifications of A2 must be added to the output offset and
drift specifications of the IA.
REV. E
–11–
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AD524.PDF ] | |
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