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參數(shù)資料
| 型號： | ISO102B |
| 英文描述： | SIGNAL ISOLATION BUFFER AMPLIFIERS |
| 中文描述： | 信號隔離緩沖放大器 |
| 文件頁數(shù)： | 14/15頁 |
| 文件大小： | 230K |
| 代理商： | ISO102B |
14
ISO102/106
AN ERROR ANALYSIS OF THE IS0102 IN A
SMALL SIGNAL MEASURING APPLICATION
High accuracy measurements of low-level signals in the
presence of high isolation mode voltages can be difficult due
to the errors of the isolation amplifiers themselves.
This error analysis shows that when a low drift operational
amplifier is used to preamplify the low-level source signal,
a low cost, simple and accurate solution is possible.
In the circuit shown in Figure 16, a 50mV shunt is used to
measure the current in a 500VDC motor. The OPA27
amplifies the 50mV by 200
x
to 10V full scale. The output
of the OPA27 is fed to the input of the IS0102, which is a
unity-gain isolation amplifier. The 5k
and 1k
potentiom-
eters connected to the IS0102 are used to adjust the gain and
offset errors to zero as described in Discussion of Specifica-
tions.
Some Observations
The total errors of the op amp and the ISO amp combined are
approximately 0.11% of full-scale range (see Figure 17). If
the op amp had not been used to preamplify the signal, the
errors would have been 2.6% of FSR. Clearly, the small cost
of adding the op amp buys a large performance improve-
ment. Optimum performance, therefore, is obtained when
the full
±
10V range of the IS0102/106 is utilized.
The rms noise of the IS0102 with a 120Hz bandwidth is only
0.18mVrms, which is only 0.0018% of the 10V full scale
output. Therefore, even though the 16
μ
V/
√
Hz noise spectral
density specification may appear large compared to other
isolation amplifiers, it does not turn out to be a significant
error term. It is worth noting that even if the bandwidth is
increased to 10kHz, the noise of the iso amp would only
contribute 0.016%FSR error.
Input
Power
Supply
ISO
102
1
+5V
OPA27
200k
V
IN
V
OUT
4
8
1
7
2
3
DC Motor
Output
Power
Supply
1
–5V
1
+5V
1
–5V
10
16
915
14
0.04μF
C
0.022μF
C
2
Bandwidth
Control
Output
Common
V
ISO
500VDC
Input Common
V
D
1k
R
1
+500VDC
R
F
1
+5V
0k
1
Offset
Adjust
+V
CC1
6
V
D
= 50mVDC (FS)
1
+5V
0.1μF
0.1μF
+V
0.1μF
0.1μF
1
–5V
–V
1
+5V
+V
1
–5V
–V
13
12
1
24
3
2
5k
Gain
Adjust
k
1
Offset Adjust
22
23
21
1
–5V
–V
CC1
Offset Adjust
Reference
1
Offset
FIGURE 16. 50mV Shunt Measures Current in a 500VDC Motor.
相關PDF資料 |
PDF描述 |
|---|---|
| ISO106 | SIGNAL ISOLATION BUFFER AMPLIFIERS |
| ISO106B | SIGNAL ISOLATION BUFFER AMPLIFIERS |
| ISO102 | SIGNAL ISOLATION BUFFER AMPLIFIERS |
| ISO103 | Low-Cost, Internally Powered ISOLATION AMPLIFIER |
| ISO103B | Low-Cost, Internally Powered ISOLATION AMPLIFIER |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ISO103 | 功能描述:特殊用途放大器 Low-Cost Internally Pwrd Iso Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| ISO103 | 制造商:Texas Instruments 功能描述:IC AMP ISOLATION DIP24 103 |
| ISO103B | 功能描述:特殊用途放大器 Low-Cost Internally Pwrd Iso Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| ISO1050 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ISOLATED CAN TRANSCEIVER |
| ISO1050_10 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ISOLATED CAN TRANSCEIVER |
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