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參數(shù)資料
| 型號： | OPA404KP |
| 元件分類： | 運算放大器 |
| 英文描述： | Quad High-Speed Precision Difet OPERATIONAL AMPLIFIER |
| 中文描述： | 四高速精密運算放大器Difet |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 228K |
| 代理商： | OPA404KP |
8
OPA404
APPLICATIONS INFORMATION
OFFSET VOLTAGE ADJUSTMENT
The OPA404 offset voltage is laser-trimmed and will require
no further trim for most applications. If desired, offset volt-
age can be trimmed by summing (see Figure 1). With this
trim method there will be no degradation of input offset drift.
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 OPA404. To avoid leakage,
utmost care must be used in planning the board layout. A
“guard” pattern should completely surround the high
imped-
ance input leads and should be connected to a low-impedance
point which is at the signal input potential. (See Figure 3).
FIGURE 2. Input Current vs Input Voltage with
±
V
CC
Pins
Grounded.
–15
–10
–5
0
+5
+10
+15
Input Voltage (V)
–2
+2
+1
–1
I
INPUT CURRENT vs INPUT VOLTAGE
WITH ±V
CC
PINS GROUNDED
0
Maximum Safe Current
Maximum Safe Current
I
IN
V
FIGURE 3. Connection of Input Guard.
HANDLING AND TESTING
Measuring the unusually low bias current of the OPA404 is
difficult without specialized test equipment; most commer-
cial benchtop testers cannot accurately measure the OPA404
bias current. Low-leakage test sockets and special test
fixtures are recommended if incoming inspection of bias
current is to be performed.
To prevent surface leakage between pins, the DIP package
should not be handled by bare fingers. Oils and salts from
fingerprints or careless handling can create leakage currents
that exceed the specified OPA404 bias currents.
If necessary, DIP packages and PC board assemblies can be
cleaned with Freon TF
, baked for 30 minutes at 85
°
C,
rinsed with de-ionized water, and baked again for 30 min-
utes at 85
°
C. Surface contamination can be prevented by the
application of a high-quality conformal coating to the cleaned
PC board assembly.
–15V
+15V
±2mV
Offset
Trim
150k
100k
In
Out
20
1/4
OPA404
FIGURE 1. Offset Voltage Trim.
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
OPA404 requires input
current limiting resistors only if its input voltage is greater
than 8 volts more negative than –V
CC
. A 10k
series resistor
will limit the input current to a safe value with up to
±
15V
input levels even if both supply voltages are lost. (See Figure
2 and Absolute Maximum Ratings).
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 preci-
sion IC operational amplifier.
In
Out
Non-Inverting
In
Out
Buffer
In
Out
Inverting
For input guarding,
guard top and bottom of board.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| OPA404KP | 制造商:BURR-BROWN 功能描述:OP AMP QUAD DIFET PRECISION DIP14 |
| OPA404KPG4 | 功能描述:運算放大器 - 運放 Quad High Speed Precision Difet 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| OPA404KU | 功能描述:運算放大器 - 運放 Quad High Speed Precision Difet 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| OPA404KU | 制造商:Texas Instruments 功能描述:IC SM OP-AMP QUAD DIFET PRECISION |
| OPA404KU | 制造商:Texas Instruments 功能描述:OP AMP QUAD DIFET PRECISION 404 |
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