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參數(shù)資料
| 型號： | OPA2111KM |
| 英文描述： | Dual Low Noise Precision Difet OPERATIONAL AMPLIFIER |
| 中文描述： | 雙低噪聲運算放大器精密Difet |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 231K |
| 代理商： | OPA2111KM |
OPA2111
9
APPLICATIONS CIRCUITS
Figures 5 through 13 are circuit diagrams of various appli-
cations for the OPA2111.
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 OPA2111. To avoid leakage
problems, it is recommended that the signal input lead of the
OPA2111 be wired to a Teflon standoff. If the OPA2111 is
to 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 (see Figure 2).
NOISE: FET vs BIPOLAR
Low noise circuit design requires careful analysis of all
noise sources. External noise sources can dominate in many
cases, so consider the effect of source resistance on overall
operational amplifier noise performance. At low source
impedances, the low voltage noise of a bipolar operational
amplifier is superior, but at higher impedances the high
current noise of a bipolar amplifier becomes a serious
liability. Above about 15k
the OPA2111 will have lower
total noise than an OP-27 (see Figure 3).
BIAS CURRENT CHANGE
vs COMMON-MODE VOLTAGE
The input bias currents of most popular BIFET opera-
tional amplifiers are affected by common-mode voltage
(Figure 4). Higher input FET gate-to-drain voltage causes
leakage and ionization (bias) currents to increase. Due to its
cascode input stage, the extremely low bias current of the
OPA2111 is not compromised by common-mode voltage.
FIGURE 2. Connection of Input Guard.
FIGURE 5. Auto-Zero Amplifier.
FIGURE 3. Voltage Noise Spectral Density vs Source
Resistance.
FIGURE 4. Input Bias Currrent vs Common-Mode Voltage.
Out
10k
1M
1
2
3
7
6
5
1/2
OPA2111BM
100k
In
1μF
Polypropylene
100k
100
1/2
OPA2111BM
Operate
Zero
Gain = –100
V
≤
5μV
Drift
≤
0.028μV/°C
Zero Droop
≤
2μV/s
Referred to Input
100
1k
10k
100k
1M
10M
1k
100
10
V
O
)
T
BM
OP-27 + Resistor
OPA2111 + Resistor
Resistor Noise Only
OPA2111 + Resistor
Resistor Noise Only
OP-27 + Resistor
E
O
R
S
1
Source Resistance, R
S
(
)
E
O
= e
N2
+ (i
N
R
S
)
2
+ 4kTR
S
80
60
40
20
0
–15
–10
–5
0
5
10
15
Common-Mode Voltage (VDC)
I
OP-15/16/17 “Perfect Bias Current Cancellation”
AD547
LF156/157
LF155
T
= 25°C; curves taken from
manufacturers' published
typical data
OPA2111
–20
2
3
1
In
Out
Inverting
TO-99 Bottom View
2
3
1
In
Out
Non-Inverting
2
3
1
In
Out
Buffer
Board layout for input guarding: guard top and bottom of board.
Alternate: use Teflon
standoff for sensitive input pins.
Teflon
E. I. Du Pont de Nemours & Co.
A
A
A
4
7
8
1
3
2
5
6
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| OPA2111AM | Dual Low Noise Precision Difet OPERATIONAL AMPLIFIER |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA2111KP | 功能描述:運算放大器 - 運放 Dual Lo-Noise 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 |
| OPA2111KP | 制造商:BURR-BROWN 功能描述:OP AMP DUAL DIFET LOW NOISE 2111 制造商:Texas Instruments 功能描述:OP AMP DUAL DIFET LOW NOISE 8DIP |
| OPA2111KP | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| OPA2111KPG4 | 功能描述:運算放大器 - 運放 Dual Lo-Noise 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 |
| OPA2111SM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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