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參數(shù)資料
| 型號： | MIC7111 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 40000 SYSTEM GATE 3.3 VOLT LOGIC CELL AR - NOT RECOMMENDED for NEW DESIGN |
| 中文描述： | 1.8 IttyBitty⑩軌到軌輸入/輸出運算放大器的初步信息 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 73K |
| 代理商： | MIC7111 |
MIC7111
Application Information
Input Common-Mode Voltage
The MIC7111 tolerates input overdrive by at least 300mV
beyond either rail without producing phase inversion.
If the absolute maximum input voltage is exceeded, the input
current should be limited to
±
5mA maximum to prevent
reducing reliability. A 10k
series input resistor, used as a
current limiter, will protect the input structure from voltages as
large as 50V above the supply or below ground. See Figure
1.
Micrel
MIC7111
6
June 1998
V
IN
V
OUT
10k
R
IN
Figure 1. Input Current-Limit Protection
Output Voltage Swing
Sink and source output resistances of the MIC7111 are
equal. Maximum output voltage swing is determined by the
load and the approximate output resistance. The output
resistance is:
R
V
I
OUT
DROP
LOAD
=
V
DROP
is the voltage dropped within the amplifier output
stage. V
DROP
and I
LOAD
can be determined from the V
O
(output swing) portion of the appropriate Electrical Character-
istics table. I
LOAD
is equal to the typical output high voltage
minus V+/2 and divided by R
LOAD
. For example, using the
Electrical Characteristics DC (5V) table, the typical output
voltage drop using a 2k
load (connected to V+/2) is 0.015V,
which produces an I
LOAD
of:
2.5V
V
2k
then:
1.243mA
=
0 015
.
R
15mV
1.243mA
1
OUT
=
=
≈
12 1
2
.
Driving Capacitive Loads
Driving a capacitive load introduces phase-lag into the output
signal, and this in turn reduces op-amp system phase margin.
The application that is least forgiving of reduced phase
margin is a unity gain amplifier. The MIC7111 can typically
drive a 500pF capacitive load connected directly to the output
when configured as a unity-gain amplifier.
Using Large-Value Feedback Resistors
A large-value feedback resistor (> 500k
) can reduce the
phase margin of a system. This occurs when the feedback
resistor acts in conjunction with input capacitance to create
phase lag in the fedback signal. Input capacitance is usually
a combination of input circuit components and other parasitic
capacitance, such as amplifier input capacitance and stray
printed circuit board capacitance.
Figure 2 illustrates a method of compensating phase lag
caused by using a large-value feedback resistor. Feedback
capacitor C
FB
introduces sufficient phase lead to overcome
the phase lag caused by feedback resistor R
FB
and input
capacitance C
IN
. The value of C
FB
is determined by first
estimating C
IN
and then applying the following formula:
R
C
R
C
IN
IN
FB
FB
×
≤
×
V
IN
C
FB
R
FB
V
OUT
C
IN
R
IN
Figure 2. Cancelling Feedback Phase Lag
Since a significant percentage of C
IN
may be caused by board
layout, it is important to note that the correct value of C
FB
may
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| MIC7111_05 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:1.8V IttyBitty Rail-to-Rail Input/Output Op Amp |
| MIC7111BM5 | 制造商:RF Micro Devices Inc 功能描述: |
| MIC7111BM5 TR | 功能描述:IC OPAMP R-R I/O 1.8V SOT23-5 RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:IttyBitty® 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:帶卷 (TR) |
| MIC7111YM5 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:1.8V IttyBitty Rail-to-Rail Input/Output Op Amp |
| MIC7111YM5 TR | 功能描述:運算放大器 - 運放 Micro-Power 1.8V IttyBitty Op-Amp - Lead Free 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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