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參數(shù)資料
| 型號： | AD620BRZ-R7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Low Cost Low Power Instrumentation Amplifier |
| 中文描述： | INSTRUMENTATION AMPLIFIER, 85 uV OFFSET-MAX, 1 MHz BAND WIDTH, PDSO8 |
| 封裝： | LEAD FREE, MS-021-AA, SOIC-8 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 559K |
| 代理商： | AD620BRZ-R7 |
AD620
Regardless of the system in which it is being used, the AD620
provides greater accuracy at low power and price. In simple
systems, absolute accuracy and drift errors are by far the most
significant contributors to error. In more complex systems
with an intelligent processor, an autogain/autozero cycle will
remove all absolute accuracy and drift errors, leaving only the
resolution errors of gain, nonlinearity, and noise, thus allowing
full 14-bit accuracy.
Rev. G | Page 14 of 20
Note that for the homebrew circuit, the OP07 specifications for
input voltage offset and noise have been multiplied by √2. This
is because a three op amp type in-amp has two op amps at its
inputs, both contributing to the overall input error.
R = 350
10V
PRECISION BRIDGE TRANSDUCER
R = 350
R = 350
R = 350
0
AD620A MONOLITHIC
AMPLIFIER, G = 100
SUPPLY CURRENT = 1.3mA MAX
AD620A
R
G
499
REFERENCE
0
Figure 39. Make vs. Buy
°
C C TRACKING
*"HOMEBREW" IN-AMP, G = 100
100
**
10k
*
10k
**
10k
*
10k
*
10k
**
10k
*
OP07D
OP07D
OP07D
0
Table 3. Make vs. Buy Error Budget
Error Source
ABSOLUTE ACCURACY at T
A
= 25°C
Input Offset Voltage, μV
Output Offset Voltage, μV
Input Offset Current, nA
CMR, dB
DRIFT TO 85°C
Gain Drift, ppm/°C
Input Offset Voltage Drift, μV/°C
Output Offset Voltage Drift, μV/°C
RESOLUTION
Gain Nonlinearity, ppm of Full Scale
Typ 0.1 Hz to 10 Hz Voltage Noise, μV p-p
G = 100, V
S
= ±15 V
.
(All errors are min/max and referred to input.)
AD620 Circuit Calculation
125 μV/20 mV
1000 μV/100 mV/20 mV
2 nA ×350 /20 mV
110 dB(3.16 ppm) ×5 V/20 mV
(50 ppm + 10 ppm) ×60°C
1 μV/°C × 60°C/20 mV
15 μV/°C × 60°C/100 mV/20 mV
40 ppm
0.28 μV p-p/20 mV
“Homebrew” Circuit Calculation
(150 μV × √2)/20 mV
((150 μV × 2)/100)/20 mV
(6 nA ×350 )/20 mV
(0.02% Match × 5 V)/20 mV/100
Total Absolute Error
100 ppm/°C Track × 60°C
(2.5 μV/°C × √2 × 60°C)/20 mV
(2.5 μV/°C × 2 × 60°C)/100 mV/20 mV
Total Drift Error
40 ppm
(0.38 μV p-p × √2)/20 mV
Total Resolution Error
Grand Total Error
Error, ppm of Full Scale
AD620
6,250
500
18
791
7,559
3,600
3,000
450
7,050
40
14
54
14,663
Homebrew
10,607
150
53
500
11,310
6,000
10,607
150
16,757
40
27
67
28,134
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