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參數(shù)資料
| 型號(hào)： | INA148UA |
| 元件分類： | 差分放大器 |
| 英文描述： | 【200V Common-Mode Voltage DIFFERENCE AMPLIFIER |
| 中文描述： | 【200伏共模電壓差分放大器 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 123K |
| 代理商： | INA148UA |
10
INA148
Preferably, the offset trim voltage applied to the Ref pin
should be buffered with an amp such as an OPA237
(see Figure 3). In this case, the op amp output impedance is
low enough that no external resistor is needed to maintain
the INA148’s excellent CMR.
INPUT IMPEDANCE
The input resistor network determines the impedance of
each of the INA148’s inputs. It is approximately 1M
.
Unlike an instrumentation amplifier, signal source imped-
ances at the two input terminals must be nearly equal to
maintain good common-mode rejection.
A mismatch between the two inputs’ source impedances will
cause a differential amplifier’s common-mode rejection to
be degraded. With a source impedance imbalance of only
500
, CMR can fall to approximately 66dB.
Figure 4 shows a common application—measuring power
supply current through a shunt resistor (R
S
). A shunt resistor
creates an unbalanced source resistance condition that can
degrade a differential amplifier’s common mode rejection.
Unless the shunt resistor is less than approximately 100
, an
additional equal compensating resistor (R
C
) is recommended
to maintain input balance and high CMR.
Source impedances (or shunts) greater than 5k
are not
recommended, even if they are “perfectly” compensated.
This is because the internal resistor network is laser-trimmed
for accurate voltage divider ratios, but not necessarily to
absolute values. Input resistors are shown as 1M
, however,
this is only their nominal value.
In practice, the input resistors’ absolute values may vary by
as much as 30 percent. The two input resistors match to
about 5 percent, so adding compensating resistors greater
than 5k
can cause a serious mismatch in the resulting
resistor network voltage divider ratios, thus degrading CMR.
Attempts to extend the INA148 input voltage range by
adding external resistors is not recommended for the reasons
just described in the last paragraph. CMR will suffer a
serious degradation unless the resistors are carefully trimmed
for CMR and gain. This is an iterative adjustment and can be
tedious and time consuming.
FIGURE 4. Shunt-Resistor Current Measurement Circuit.
FIGURE 5. AC-Coupled Difference Amplifier.
1M
50k
52.6316k
50k
2.7778k
1M
R
C
R
S
I
L
V
CM
7
3
200V
2
6
4
1
A1
INA148
–15V
V
O
+15V
LOAD
V
O
= I
L
R
S
Make R
C
= R
S
if R
S
≥
100
1M
50k
52.6316k
50k
2.7778k
1M
7
3
2
6
4
1
A1
INA148
–15V
V
O
+15V
Typical CMR: 50Hz = 59dB
60Hz = 61dB
400Hz = 78dB
NOTE: (1) Metallized polypropylene,
±
5% tolerance.
C
1
4.7
μ
F
(1)
250V
C
2
4.7
μ
F
(1)
250V
V
IN
+
V
IN
–
V
CM
= 200Vpk
V
O
= (V
IN
– V
IN
)
–
+
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| INA148UA/2K5 | 功能描述:差分放大器 +-200V 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(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 |
| INA148UA/2K5G4 | 功能描述:差分放大器 +-200V 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(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 |
| INA148UAG4 | 功能描述:差分放大器 +-200V 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(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 |
| INA149 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High Common-Mode Voltage Difference Amplifier |
| INA149AID | 功能描述:差分放大器 High Common Mode Vltg Diff Amp 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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