AD629(RevA) 데이터 시트보기 (PDF) - Analog Devices
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AD629 Datasheet PDF : 12 Pages
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AD629
OUTPUT
CURRENT
10 AMPS
200VCM DC
TO GROUND
1⍀
SHUNT
60Hz
POWER LINE
REF(–) 21.1k⍀
1
8 NC
–IN 380k⍀ 380k⍀
2
7
+IN 380k⍀
3
6
+VS
0.1F
VOUT
20k⍀
REF(+)
–VS
4
5
0.1F AD629
NC = NO CONNECT
Figure 37. Error Budget Analysis Example 1. VIN = 10 V
Full-Scale, VCM = 200 V DC. RSHUNT = 1 Ω, 1 V p-p 60 Hz
Power-Line Interference
Error Budget Analysis Example 2
This application is similar to the previous example except that
the sensed load current is from an amplifier with an ac common-
mode component of ± 100 V (frequency = 500 Hz) present on
the shunt (Figure 38). All other conditions are the same as
before. Note that the same kind of power line interference can
happen as detailed in Example 1. However, the ac common-
mode component of 200 V p-p coming from the shunt is much
larger than the interference of 1 V p-p, so that this interference
component can be neglected.
OUTPUT
CURRENT
10 AMPS
؎100V AC CM
TO GROUND
1⍀
SHUNT
60Hz
POWER LINE
REF(–) 21.1k⍀
1
8 NC
–IN 380k⍀ 380k⍀
2
7
+IN 380k⍀
3
6
+VS
0.1F
VOUT
20k⍀
REF(+)
–VS
4
5
0.1F AD629
NC = NO CONNECT
Figure 38. Error Budget Analysis Example 2. VIN = 10 V
Full-Scale, VCM = ±100 V at 500 Hz, RSHUNT = 1 Ω
Table IV. AD629 vs. INA117 AC Error Budget Example 2 (VCM = ؎100 V @ 500 Hz)
Error Source
AD629
INA117
Error, ppm of FS
AD629
INA117
ACCURACY, TA = 25°C
Initial Gain Error
(0.0005 × 10) ÷ 10 V × 106
(0.0005 × 10) ÷ 10 V × 106
500
500
Offset Voltage
(0.001 V ÷ 10 V) × 106
(0.002 V ÷ 10 V) × 106
100
200
Total Accuracy Error: 600
700
TEMPERATURE DRIFT (85°C)
Gain
10 ppm/°C × 60°C
10 ppm/°C × 60°C
600
600
Offset Voltage
(20 µV/°C × 60°C) × 106/10 V (40 µV/°C × 60°C) × 106/10 V
120
240
Total Drift Error: 720
840
RESOLUTION
Noise, Typ, 0.01–10 Hz, µV p-p
CMR @ 60 Hz
Nonlinearity
AC CMR @ 500 Hz
15 µV ÷ 10 V × 106
(141 × 10–6 × 1 V) ÷ 10 V × 106
(10–5 × 10 V) ÷ 10 V × 106
(141 × 10–6 × 200 V) ÷ 10 V × 106
25 µV ÷ 10 V × 106
(500 × 10–6 × 1 V) ÷ 10 V × 106
(10–5 × 10 V) ÷ 10 V × 106
(500 × 10–6 × 200 V) ÷ 10 V × 106
2
14
10
2,820
3
50
10
10,000
Total Resolution Error: 2,846
10,063
Total Error: 4,166
11,603
REV. A
–11–
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