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參數(shù)資料
| 型號： | INA117 |
| 元件分類： | 差分放大器 |
| 英文描述： | High Common-Mode Voltage DIFFERENCE AMPLIFIER |
| 中文描述： | 高共模電壓差分放大器 |
| 文件頁數(shù)： | 10/14頁 |
| 文件大?。?/td> | 192K |
| 代理商： | INA117 |
10
INA117
Figure 8 shows very high input impedance buffer used to
measure low leakage currents. Here, the buffer op amp is
powered with an isolated, split-voltage power supply. Using
an isolated power supply allows full
±
200V common-mode
input range.
NOISE PERFORMANCE
The noise performance of the INA117 is dominated by the
internal resistor network. The thermal or Johnson noise of
these resistors produces approximately 550nV/
√
Hz noise.
The internal op amp contributes virtually no excess noise at
frequencies above 100Hz.
Many applications may be satisfied with less than the full
200kHz bandwidth of the INA117. In these cases, the noise
can be reduced with a low-pass filter on the output. The two-
pole filter shown in Figure 9 limits bandwidth to 1kHz and
reduces
noise
by
more than 15:1. Since the INA117 has a
1/f noise corner frequency of approximately 100Hz, a cutoff
frequency below 100Hz will not further reduce noise.
380k
380k
380k
21.1k
20k
2
3
8
1
5
e
O
= I
L
x 10
9
(1V/nA)
6
OPA111
INA117
D
1,2
*
1k
100k
9k
Device
Under
Test
100M
±200V max
I
L
+15V
+15V
Com
–15V
PWS725
Isolated DC/DC Converter
*D
and D
are each a 2N3904 transistor
base-collector junction (emitter open).
FIGURE 9. Output Filter for Noise Reduction.
BUTTERWORTH
LOW-PASS
f
–3dB
200kHz
100kHz
10kHz
1kHz
≤
100Hz
(1)
OUTPUT NOISE
(mVp-p)
R
1
R
2
C
1
C
2
1.8
1.1
0.35
0.11
0.05
No Filter
11k
11.3k
11k
11.3k
11k
11.3k
11k
11.3k
100pF
1nF
10nF
0.1
μ
F
200pF
2nF
20nF
0.2
μ
F
NOTE: (1) Since the INA117 has a 1/f noise corner frequency of approximately 100Hz,
bandwidth reduction below this frequency will not significantly reduce noise.
380k
380k
380k
20k
21.1k
4
7
2
3
8
1
5
V
O
= V
2
– V
3
6
V–
V+
V
3
V
2
R
2
11.3k
C
0.02μF
OPA27
2-Pole Butterworth
Low-Pass Filter
C
0.01μF
R
1
11.0k
See Application Bulletin AB-017 for other filters.
FIGURE 8. Leakage Current Measurement Circuit.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| INA117AM | 功能描述:差分放大器 High Common-Mode Voltage RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調整:6 dB to 26 dB 輸入補償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel |
| INA117AM4 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High Common-Mode Voltage DIFFERENCE AMPLIFIER |
| INA117BM | 功能描述:差分放大器 High Common-Mode Voltage RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調整:6 dB to 26 dB 輸入補償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel |
| INA117BM1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High Common-Mode Voltage DIFFERENCE AMPLIFIER |
| INA117BM-1 | 制造商:BandB 功能描述:Voltage Follower, Single, 8 Pin, Metal, CAN 制造商:BB 功能描述:Voltage Follower, Single, 8 Pin, Metal, CAN |
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