参数资料
| 型号： | MIC7111BM5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 12/12页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP R-R I/O 1.8V SOT23-5 |
| 标准包装： | 3,000 |
| 系列： | IttyBitty® |
| 放大器类型： | 通用 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.02 V/µs |
| 增益带宽积： | 25kHz |
| 电流 - 输入偏压： | 1pA |
| 电压 - 输入偏移： | 900µV |
| 电流 - 电源： | 25µA |
| 电流 - 输出 / 通道： | 200mA |
| 电压 - 电源，单路/双路(±)： | 1.8 V ~ 11 V，±0.9 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC7111BM5TR MIC7111BM5TR-ND |
Micrel, Inc.
MIC7111
February 11, 2013
9
Revision 2.0
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.
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 presented in Equation 1:
LOAD
DROP
OUT
I
V
R
=
Eq. 1
VDROP is the voltage dropped within the amplifier output
stage. VDROP and ILOAD can be determined from the VO
(output swing) portion of the appropriate electrical
characteristics table. ILOAD is equal to the typical output
high voltage minus V+/2 and divided by RLOAD. For
example, using the DC Electrical Characteristics (5V)
table, the typical output voltage drop using a 2k load
(connected to V+/2) is 0.015V, which produces an ILOAD
of:
1.243mA
2k
Ω
0.015V
2.5V
=
Eq. 2
Then,
12
Ω
12.1
1.243mA
15mV
R
OUT
=
Eq. 3
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 feedback 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 CFB introduces sufficient phase lead
to overcome the phase lag caused by feedback resistor
RFB and input capacitance CIN. The value of CFB is
determined by first estimating CIN and then applying the
following formula:
RIN × CIN
≤ R
FB × CFB
Eq. 4
Figure 2. Cancelling Feedback Phase Lag
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相关代理商/技术参数 |
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| MIC7111YM5 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:1.8V IttyBitty Rail-to-Rail Input/Output Op Amp |
| MIC7111YM5 TR | 功能描述:运算放大器 - 运放 Micro-Power 1.8V IttyBitty Op-Amp - Lead Free RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MIC7111YM5TR | 制造商:Micrel 功能描述:OP Amp Single GP R-R I/O 11V |
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