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參數資料
| 型號： | KM4470IP14TR3 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Low Cost, +2.7V & +5V, Rail-to-Rail I/O Amplifiers |
| 中文描述： | QUAD OP-AMP, 6000 uV OFFSET-MAX, 2.2 MHz BAND WIDTH, PDSO14 |
| 封裝： | TSSOP-14 |
| 文件頁數： | 7/16頁 |
| 文件大?。?/td> | 459K |
| 代理商： | KM4470IP14TR3 |
KM4170, KM4270, KM4470
DATA SHEET
REV. 5 December 2002
7
Application Information
General Description
The KM4X70 family of amplifiers are single supply, general
purpose, voltage-feedback amplifiers. They are fabricated on
a complementary bipolar process, feature a rail-to-rail input
and output, and are unity gain stable.
The typical non-inverting circuit schematic is shown in Figure 1.
Figure 1: Typical Non-inverting Configuration
Input Common Mode Voltage
The common mode input range extends to 250mV below
ground and to 250mV above V
s
, in single supply operation.
Exceeding these values will not cause phase reversal. However,
if the input voltage exceeds the rails by more than 0.5V, the
input ESD devices will begin to conduct. The output will
stay at the rail during this overdrive condition. If the absolute
maximum input voltage (700mV beyond either rail) is
exceeded, externally limit the input current to ±5mA as
shown in Figure 2.
Figure 2: Circuit for Input Current Protection
Power Dissipation
The maximum internal power dissipation allowed is directly
related to the maximum junction temperature. If the maximum
junction temperature exceeds 150°C, some performance
degradation will occur. If the maximum junction temperature
exceeds 175°C for an extended time, device failure may occur.
Overdrive Recovery
Overdrive of an amplifier occurs when the output and/or
input ranges are exceeded. The recovery time varies based on
whether the input or output is overdriven and by how much
the ranges are exceeded. The KM4X70 will typically recover
in less than 50ns from an overdrive condition. Figure 3 shows
the KM4X70 amplifier family in an overdriven condition.
Figure 3: Overdrive Recovery
Driving Capacitive Loads
The
Frequency Response vs. C
L
plot, illustrates the response
of the KM4X70 amplifier family. A small series resistance
(R
s
) at the output of the amplifier, illustrated in Figure 4, will
improve stability and settling performance. R
s
values in the
Frequency Response vs. C
L
plot were chosen to achieve maximum
bandwidth with less than 2dB of peaking. For maximum
flatness, use a larger R
s
. Capacitive loads larger than 50pF
require the use of R
s
.
Figure 4: Typical Topology for driving
a capacitive load
Driving a capacitive load introduces phase-lag into the output
signal, which reduces phase margin in the amplifier. The
unity gain follower is the most sensitive configuration. In a
unity gain follower configuration, the KM4X70 amplifier
family requires a 510
series resistor to drive a 100pF load.
+
KM4100
-
R
f
0.01
μ
F
6.8
μ
F
+
Out
In
+V
s
R
g
R1
2
R
out
R1
1
R2
I
Time (10
μ
s/div)
Output
Input
G = 5
-
+
10k
V
o
V
in
+
-
R
f
R
g
R
s
C
L
R
L
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