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參數(shù)資料
| 型號： | INA114AUE4 |
| 元件分類： | 測量放大器 |
| 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 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 191K |
| 代理商： | INA114AUE4 |
INA114
9
OFFSET TRIMMING
The INA114 is laser trimmed for very low offset voltage and
drift. Most applications require no external offset adjust-
ment. Figure 2 shows an optional circuit for trimming the
output offset voltage. The voltage applied to Ref terminal is
summed at the output. Low impedance must be maintained
at this node to assure good common-mode rejection. This is
achieved by buffering trim voltage with an op amp as
shown.
FIGURE 2. Optional Trimming of Output Offset Voltage.
INPUT BIAS CURRENT RETURN PATH
The input impedance of the INA114 is extremely high—
approximately 10
10
. However, a path must be provided for
the input bias current of both inputs. This input bias current
is typically less than
±
1nA (it can be either polarity due to
cancellation circuitry). High input impedance means that
this input bias current changes very little with varying input
voltage.
Input circuitry must provide a path for this input bias current
if the INA114 is to operate properly. Figure 3 shows various
provisions for an input bias current path. Without a bias
current return path, the inputs will float to a potential which
exceeds the common-mode range of the INA114 and the
input amplifiers will saturate. If the differential source resis-
tance is low, bias current return path can be connected to one
input (see thermocouple example in Figure 3). With higher
source impedance, using two resistors provides a balanced
input with possible advantages of lower input offset voltage
due to bias current and better common-mode rejection.
INPUT COMMON-MODE RANGE
The linear common-mode range of the input op amps of the
INA114 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
1
and A
2
. 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
signals can cause the output of A
1
or A
2
to saturate. Figure
4 shows the output voltage swing of A
1
and A
2
expressed in
terms of a common-mode and differential input voltages.
Output swing capability of these internal amplifiers is the
same as the output amplifier, A
3
. For applications where
input common-mode range must be maximized, limit the
output voltage swing by connecting the INA114 in a lower
gain (see performance curve “Input Common-Mode Voltage
Range vs Output Voltage”). If necessary, add gain after the
INA114 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 nearly the same output
voltage limit, the difference voltage measured by the output
amplifier will be near zero. The output of the INA114 will
be near 0V even though both inputs are overloaded.
INPUT PROTECTION
The inputs of the INA114 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 protection, series input resistors would contribute
excessive noise. If the input is overloaded, the protection
circuitry limits the input current to a safe value (approxi-
mately 1.5mA). The typical performance curve “Input Bias
Current vs Common-Mode Input Voltage” shows this input
FIGURE 3. Providing an Input Common-Mode Current Path.
INA114
V
IN
V
IN
R
G
–
+
10k
V
O
OPA177
Ref
±10mV
Adjustment Range
100
100
100μA
1/2 REF200
100μA
1/2 REF200
V+
V–
INA114
47k
47k
INA114
10k
Microphone,
Hydrophone
etc.
Thermocouple
INA114
Center-tap provides
bias current return.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| INA114BP | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
| INA114BU | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
| INA114 | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
| INA114AP | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
| INA114AU | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| INA114AUG4 | 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 |
| INA114BG | 制造商:BB 制造商全稱:BB 功能描述:Precision INSTRUMENTATION AMPLIFIER |
| INA114BP | 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 |
| INA114BP | 制造商:Texas Instruments 功能描述:IC AMP INSTRUMENTATION PDIP8 114 |
| INA114BPG4 | 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 |
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