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參數(shù)資料
| 型號： | OPA124PB |
| 英文描述： | Low Noise Precision Difet OPERATIONAL AMPLIFIER |
| 中文描述： | 低噪聲運算放大器精密Difet |
| 文件頁數(shù)： | 8/8頁 |
| 文件大?。?/td> | 137K |
| 代理商： | OPA124PB |
OPA124
8
APPLICATIONS INFORMATION
OFFSET VOLTAGE ADJUSTMENT
The OPA124 offset voltage is laser-trimmed and will require
no further trim for most applications. In order to reduce
layout leakage errors, the offset adjust capability has been
removed from the SOIC versions (OPA124UA and
OPA124U). The PDIP versions (OPA124PB, OPA124PA,
and OPA124P) do have pins available for offset adjustment.
As with most amplifiers, externally trimming the remaining
offset can change drift performance by about 0.3
μ
V/
°
C for
each 100
μ
V of adjusted offset. The correct circuit configu-
ration for offset adjust for the PDIP packages is shown in
Figure 1.
INPUT PROTECTION
Conventional monolithic FET operational amplifiers require
external current-limiting resistors to protect their inputs
against destructive currents that can flow when input FET
gate-to-substrate isolation diodes are forward-biased. Most
BIFET amplifiers can be destroyed by the loss of –V
CC
.
Unlike BIFET amplifiers, the
Difet
OPA124 requires input
current limiting resistors only if its input voltage is greater
than 6V more negative than –V
CC
. A 10k
series resistor
will limit input current to a safe level with up to
±
15V input
levels, even if both supply voltages are lost (Figure 2).
Static damage can cause subtle changes in amplifier input
characteristics without necessarily destroying the device. In
precision operational amplifiers (both bipolar and FET types),
this may cause a noticeable degradation of offset voltage and
drift. Static protection is recommended when handling any
precision IC operational amplifier.
GUARDING AND SHIELDING
As in any situation where high impedances are involved,
careful shielding is required to reduce “hum” pickup in input
leads. If large feedback resistors are used, they should also
be shielded along with the external input circuitry.
Leakage currents across printed circuit boards can easily
exceed the bias current of the OPA124. To avoid leakage
problems, the OPA124 should be soldered directly into a
printed circuit board. Utmost care must be used in planning
the board layout. A “guard” pattern should completely
surround the high impedance input leads and should be
connected to a low impedance point which is at the signal
input potential.
The amplifier substrate should be connected to any input
shield or guard via pin 8 minimizing both leakage and noise
pickup (see Figure 3).
If guarding is not required, pin 8 should be connected to
ground.
OPA124P
2
3
7
+V
CC
4
5
1
6
–V
CC
10k
(100k
±10mV typical trim range.
to 1M
trim potentiometer.
recommended).
NOTE: No trim on SOIC.
FIGURE 3. Connection of Input Guard.
FIGURE 2. Input Current vs Input Voltage with
±
V
CC
Pins
Grounded.
V
I
IN
Maximum Safe Current
Maximum Safe Current
–15
Input Voltage (V)
–10
–5
0
5
10
15
I
2
1
0
–1
–2
FIGURE 1. Offset Voltage Trim for PDIP packages.
4
OPA124
2
3
6
8
In
Out
Inverting
OPA124
2
3
6
In
Out
Non-Inverting
8
OPA124
2
3
6
In
Out
Buffer
8
Board layout for PDIP input guarding: guard top and bottom of board.
Bottom View
8
7
6
5
1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA124U | Low Noise Precision Difet OPERATIONAL AMPLIFIER |
| OPA124UA | Low Noise Precision Difet OPERATIONAL AMPLIFIER |
| OPA129 | Ultra-Low Bias Current Difet OPERATIONAL AMPLIFIER |
| OPA129P | Ultra-Low Bias Current Difet OPERATIONAL AMPLIFIER |
| OPA129PB | Ultra-Low Bias Current Difet OPERATIONAL AMPLIFIER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA124U | 功能描述:運算放大器 - 運放 Lo Noise Prec Difet Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| OPA124U/2K5 | 功能描述:運算放大器 - 運放 Lo Noise Prec Difet Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| OPA124U/2K5E4 | 功能描述:運算放大器 - 運放 Lo Noise Prec Difet Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| OPA124U/2K5G4 | 功能描述:運算放大器 - 運放 Lo Noise Prec Difet Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| OPA124UA | 功能描述:運算放大器 - 運放 Lo Noise Prec Difet Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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