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參數(shù)資料
| 型號(hào)： | INA145UA |
| 英文描述： | CONN SMA PLUG RT/ANGL CRIMP GOLD |
| 中文描述： | 可編程增益差分放大器 |
| 文件頁(yè)數(shù)： | 9/11頁(yè) |
| 文件大?。?/td> | 127K |
| 代理商： | INA145UA |
9
INA145
FIGURE 2. Optional Offset Trim Circuit.
FIGURE 3. Measuring Current with Shunt Resistor.
OFFSET TRIM
The INA145 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 INA145 is determined by the
input resistor network and is approximately 40k
. The
source impedance at the two input terminals must be nearly
equal to maintain good common-mode rejection. A 5
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 300
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 300
can cause a mismatch in
the total resistor ratios, degrading CMR.
V
O
= 100 I
L
R
S
G = 100
+5V
+7V
+10V
+15V
8V
12V
18V
28V
V+
+5V
1
4
8
Load
R
G2
1M
10k
INA145
5
7
6
2
3
R
S
1
V
B
I
L
V+
Max V
B
R
G1
10.2k
V
IN
V
O
1
A1
V
IN
10
10k
Offset Adjustment Range =
±
15mV, RTI
(
±
1.5mV at pin 1)
R
T
100k
10
100k
+15V
V
O1
–15V
40k
40k
40k
10k
A2
40k
5
6
NOTE: Increasing the trim resistor
R
T
will decrease the trim range
INA145
–
+
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| INA146 | High-Voltage, Programmable Gain DIFFERENCE AMPLIFIER |
| INA146UA | High-Voltage, Programmable Gain DIFFERENCE AMPLIFIER |
| INA148 | 【200V Common-Mode Voltage DIFFERENCE AMPLIFIER |
| INA148UA | 【200V Common-Mode Voltage DIFFERENCE AMPLIFIER |
| INA154UA | High-Speed, Precision DIFFERENCE AMPLIFIER G = 1 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| INA145UA | 制造商:BURR-BROWN 功能描述:AMP DIFF PROGRAMMABLE SOIC8 145 制造商:Texas Instruments 功能描述:IC INSTRUMENTATION AMPLIFIER 制造商:Texas Instruments 功能描述:IC, INSTRUMENTATION AMPLIFIER |
| INA145UA | 制造商:Texas Instruments 功能描述:Instrumentation Amplifier IC |
| INA145UA/2K5 | 功能描述:差分放大器 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 |
| INA145UA/2K5E4 | 功能描述:差分放大器 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 |
| INA145UAE4 | 功能描述:差分放大器 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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