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參數(shù)資料
| 型號(hào)： | INA115 |
| 元件分類(lèi)： | 測(cè)量放大器 |
| 英文描述： | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
| 中文描述： | 單電源，軌至軌，低成本儀表放大器 |
| 文件頁(yè)數(shù)： | 11/11頁(yè) |
| 文件大小： | 211K |
| 代理商： | INA115 |
11
INA115
FIGURE 7. ECG Amplifier with Right Leg Drive.
INPUT COMMON-MODE RANGE
The linear common-mode range of the input op amps of the
INA115 is approximately
±
13.75V (or 1.25V from the power
supplies). As the output voltage increases, however, the linear
input range will be limited by the output voltage swing of the
input amplifiers, A
and A
. The common-mode range is
related to the output voltage of the complete amplifier—see
performance curve “Input Common-Mode Range vs Output
Voltage.”
A combination of common-mode and differential input sig-
nals can cause the output of A
or A
2
to saturate. Figure 6
shows the output voltage swing of A
and A
expressed in
terms of a common-mode and differential input voltages.
Output swing capability of the input amplifiers, A
and A
is
the same as the output amplifier, A
. For applications where
input common-mode range must be maximized, limit the
output voltage swing by connecting the INA115 in a lower
gain (see performance curve “Input Common-Mode Voltage
Range vs Output Voltage”). If necessary, add gain after the
INA115 to increase the voltage swing.
Input-overload often produces an output voltage that appears
normal. For example, an input voltage of +20V on one input
and +40V on the other input will obviously exceed the linear
common-mode range of both input amplifiers. Since both
input amplifiers are saturated to the nearly the same output
voltage limit, the difference voltage measured by the output
amplifier will be near zero. The output of the INA115 will be
near 0V even though both inputs are overloaded.
INPUT PROTECTION
The inputs of the INA115 are individually protected for
voltages up to
±
40V. For example, a condition of –40V on one
input and +40V on the other input will not cause damage.
Internal circuitry on each input provides low series impedance
under normal signal conditions. To provide equivalent protec-
tion, series input resistors would contribute excessive noise. If
the input is overloaded, the protection circuitry limits the input
current to a safe value (approximately 1.5mA). The typical
performance curve “Input Bias Current vs Common-Mode
Input Voltage” shows this input current limit behavior. The
inputs are protected even if the power supply voltage is zero.
OTHER APPLICATIONS
See the INA114 data sheet for other applications circuits of
general interest.
LA
RL
RA
24.9k
OPA177
390k
390k
24.9k
INA115
R
G
V
O2
V
O1
V
O
FIGURE 6. Voltage Swing of A
1
and A
2
.
A
1
A
2
A
3
25k
25k
25k
25k
R
G
V+
V–
INA115
V
O
= G V
D
G = 1 +50k
R
G
25k
25k
V
CM
–G 2
D
V
D
2
V
D
2
V
CM
V
CM
+ G 2
D
Over-Voltage
Protection
Over-Voltage
Protection
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PDF描述 |
|---|---|
| INA116PA | Very High Accuracy Instrumentation Amplifier |
| INA116UA | MOSFET N-CH 450V 7A TO-220D |
| INA116 | Very High Accuracy Instrumentation Amplifier |
| INA116P | Very High Accuracy Instrumentation Amplifier |
| INA116U | Very High Accuracy Instrumentation Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| INA115AU | 功能描述:儀表放大器 Precision Instrumentation Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
| INA115AU/1K | 功能描述:儀表放大器 Precision Instrumentation Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
| INA115AU/1KE4 | 功能描述:儀表放大器 Precision Instrumentation Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
| INA115AU-1 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| INA115AU-1/1K | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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