5962-8853901EA(RevG) 查看數據表（PDF） - Analog Devices
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5962-8853901EA Datasheet PDF : 25 Pages
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Data Sheet
39kΩ
–VS
AD589
MSB
DATA
4
INPUTS LSB
11
CS
12
WR
13
+VS
+INPUT
RG1
G = 10
G = 100
G = 1000
2+
8
16
13
10
12 AD524
11
6
RG2
–INPUT
3
7
1–
VREF
–VS
+VS
15 14 16
C1
AD7524
OUT1
1
OUT2
2
3
+VS
2– 8
1
3+
1/2
AD712
GND
9
R3
20kΩ
R5
20kΩ
R4
10kΩ
R6
5kΩ
1/2
AD712
6–
7
5+ 4
–VS
Figure 50. Software Controllable Offset
In many applications, complex software algorithms for auto-
zero applications are not available. For those applications,
Figure 51 provides a hardware solution.
+VS
15 16
14
13
RG1
RG2
2
16
8
13
10
12 AD524
9
VOUT
11
6 0.1µF LOW
3
7
LEAKAGE
9 10
CH
1
1kΩ
–VS
–
12 11
AD711 +
VDD
8
VSS
1
GND
2
200µs
ZERO PULSE
AD7510KD
A1
A2
A3
A4
Figure 51. Auto-Zero Circuit
AD524
+10V
350Ω
350Ω
350Ω
350Ω
RG1
G = 100
RG2
+VS
8
2+
16
13
12
11
3
1–
10kΩ
4
5
AD524C
7
10
9
6
–VS
14-BIT
ADC
0V TO 2V
F.S.
Figure 52. Typical Bridge Application
ERROR BUDGET ANALYSIS
To illustrate how instrumentation amplifier specifications are
applied, review a typical case where an AD524 is required to
amplify the output of an unbalanced transducer. Figure 52
shows a differential transducer, unbalanced by 100 Ω, supplying
a 0 mV to 20 mV signal to an AD524C. The output of the IA
feeds a 14-bit ADC with a 0 V to 2 V input voltage range. The
operating temperature range is −25°C to +85°C. Therefore, the
largest change in temperature, ΔT, within the operating range is
from ambient to +85°C (85°C − 25°C = 60°C).
In many applications, differential linearity and resolution are of
prime importance in cases where the absolute value of a variable is
less important than changes in value. In these applications, only
the irreducible errors (45 ppm = 0.004%) are significant. Further-
more, if a system has an intelligent processor monitoring the
analog-to-digital output, the addition of an autogain/auto-zero
cycle removes all reducible errors and may eliminate the require-
ment for initial calibration. This also reduces errors to 0.004%.
Rev. G | Page 21 of 25
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