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參數(shù)資料
| 型號(hào)： | OPA111SM |
| 英文描述： | Low Noise Precision Difet OPERATIONAL AMPLIFIER |
| 中文描述： | 低噪聲運(yùn)算放大器精密Difet |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 178K |
| 代理商： | OPA111SM |
8
OPA111
TYPICAL PERFORMANCE CURVES
(CONT)
T
A
= +25
°
C, V
CC
=
±
15VDC unless otherwise noted.
APPLICATIONS INFORMATION
OFFSET VOLTAGE ADJUSTMENT
The OPA111 offset voltage is laser-trimmed and will require
no further trim for most applications. As with most amplifi-
ers, externally trimming the remaining offset can change
drift performance by about 0.3
μ
V/
°
C for each 100
μ
V of
adjusted offset. Note that the trim (Figure 1) is similar to
operational amplifiers such as 741 and AD547. The OPA111
can replace most other amplifiers by leaving the external
null circuit unconnected.
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
.
FIGURE 1. Offset Voltage Trim.
FIGURE 2. Input Current vs Input Voltage with
±
V
CC
Pins
Grounded.
Unlike BIFET amplifiers, The
Difet
OPA111 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.
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 OPA111. To avoid leakage
problems, it is recommended that the signal input lead of the
OPA111 be wired to a Teflon standoff. If the OPA111 is to
be soldered directly into a printed circuit board, utmost care
must be used in planning the board layout. A “guard” pattern
INPUT OFFSET VOLTAGE CHANGE
DUE TO THERMAL SHOCK
150
75
0
–75
–150
Time From Thermal Shock (Minutes)
O
–1
0
1
2
3
4
5
25°C
85°C
BM
AM
T
A
= 25°C to T
= 85°C
Air Environment
OPA111
2
3
7
4
5
1
6
–V
CC
+V
CC
10k
to 1M trim potentiometer
(100k
recommended).
±10mV typical trim range.
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
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| OPA121KU | 功能描述:運(yùn)算放大器 - 運(yùn)放 Lo Cost 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(bǔ)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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