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參數(shù)資料
| 型號： | INA146 |
| 元件分類： | 差分放大器 |
| 英文描述： | High-Voltage, Programmable Gain DIFFERENCE AMPLIFIER |
| 中文描述： | 高電壓，可編程增益差分放大器 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 129K |
| 代理商： | INA146 |
9
INA146
FIGURE 2. Optional Offset Trim Circuit.
V
IN
+
V
O
1
A1
V
IN
–
100
10k
Offset Adjustment Range =
±
15mV, RTI
(
±
1.5mV at pin 1)
R
T
100k
10
100k
+15V
V
O1
–15V
R
3
R
1
R
2
R
5
A2
R
4
5
6
NOTE: Increasing the trim resistor
R
T
will decrease the trim range
V
O
= 1.08V nominal
Output scaled to low
voltage A/D converter.
+5V
+7V
+10V
≥
11V
40V
60V
95V
100V
V+
+5V
1
4
8
Load
R
G2
10k
10k
INA146
5
7
6
2
Differential measurement at
battery rejects voltage drop
in connection resistance, R
X
.
3
V
IN
R
X
R
X
10.8V
+
V+
Max V
IN
FIGURE 3. Measuring Voltages Greater than Supply Voltage.
OFFSET TRIM
The INA146 is laser-trimmed for low offset voltage and
drift. Most applications require no external offset adjust-
ment. Figure 2 shows an optional circuit for trimming the
offset voltage. A voltage applied to the Ref terminal will
be summed with the output signal. This can be used to null
offset voltage. To maintain good common-mode rejection,
the source impedance of a signal applied to the Ref
terminal should be less than 10
and a resistor added to
the positive input terminal should be 10 times that, or
100
. Alternatively, the trim voltage can be buffered with
an op amp such as the OPA277.
INPUT IMPEDANCE
The input impedance of the INA146 is determined by the
input resistor network and is approximately 100k
. The
source impedance at the two input terminals must be nearly
equal to maintain good common-mode rejection. A 12
mismatch in impedance between the two inputs will cause
the typical common-mode rejection to be degraded to ap-
proximately 72dB. Figure 7 shows a common application
measuring power supply current through a shunt resistor.
The source impedance of the shunt resistor, R
S
, is balanced
by an equal compensation resistor, R
C
.
Source impedances greater than 800
are not recommended,
even if they are perfectly matched. Internal resistors are laser
trimmed for accurate ratios, not to absolute values. Adding
equal resistors greater than 800
can cause a mismatch in
the total resistor ratios, degrading CMR.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| INA146UA | 功能描述:差分放大器 High-Voltage Programmable Gain RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補(bǔ)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(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel |
| INA146UA | 制造商:Texas Instruments 功能描述:AMP DIFF HIGH VOLT SMD SOIC8 146 |
| INA146UA | 制造商:Texas Instruments 功能描述:IC DIFF AMP 550kHZ 0.45V/ SOIC-8 制造商:Texas Instruments 功能描述:IC, DIFF AMP, 550kHZ, 0.45V/ uS, SOIC-8 |
| INA146UA/2K5 | 功能描述:差分放大器 High-Voltage Programmable Gain RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補(bǔ)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(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel |
| INA146UA/2K5E4 | 功能描述:差分放大器 High-Voltage Programmable Gain RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補(bǔ)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(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel |
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