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參數(shù)資料
| 型號(hào)： | MIC7201BM5 |
| 廠商： | MICREL INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | GainBlock⑩ Difference Amplifier Preliminary Information |
| 中文描述： | OP-AMP, 400 MHz BAND WIDTH, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 72K |
| 代理商： | MIC7201BM5 |
MIC7201
Applications Information
Input Common Mode Voltage
The MIC7201 tolerates overdriving the inputs 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 to prevent reducing reliabil-
ity. 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.
Output Voltage Swing
Output resistance of the MIC7201 is symmetric; sink and
source output resistances are equal. Output voltage swing is
determined by the load and, given the approximate output
resistance, which may be readily calculated with the following
formula:
Micrel
MIC7201
6
December 1998
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
OUT
(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 – 0.015V) / 2k
≈
1.243mA.
Then:
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 system phase margin. The
application that is least forgiving of reduced phase margin is
a unity gain amplifier. The MIC7201 typically can drive a
500pF capacitive load connected directly to its output.
V
SUPPLY
DAC
0.1μF
0.1μF
I
OUT
I
OUT
Digital
Input
0.1μF
R
L
0.1μF
V
OUT
4.7μF
MIC7201
Figure 1. Audio DAC
IN+
OUT
50k
100k
V+
50k
50k
100k
IN–
V–
MIC7201
1
2
3
4
5
V
IN
V
V+
V
V
2
OUT
IN
=
Figure 2. Gain of One-Half
IN+
OUT
50k
100k
V+
50k
50k
100k
IN–
V–
MIC7201
1
2
3
4
5
V
IN
V
V+
V
OUT
= V
IN
V
V+
2
Figure 3. Voltage Follower
IN+
OUT
50k
100k
V+
50k
50k
100k
IN–
V–
MIC7201
1
2
3
4
5
V
V+
V
OUT
= –V
IN
0.1μF
V
IN
Figure 4. Inverting Unity Gain
IN+
OUT
50k
100k
V+
50k
50k
100k
IN–
V–
MIC7201
1
2
3
4
5
V
V+
0.1μF
V
V
2
OUT
V+
=
Figure 5. Virtual Ground Generator
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