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參數(shù)資料
| 型號： | FAN4174IS5X_NL |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Single, Ultra-Low Cost, Rail-to-Rail I/O, CMOS Amplifier |
| 中文描述： | OP-AMP, 6000 uV OFFSET-MAX, 4 MHz BAND WIDTH, PDSO5 |
| 封裝： | LEAD FREE, SC74A, SOT-23, 5 PIN |
| 文件頁數(shù)： | 9/14頁 |
| 文件大?。?/td> | 511K |
| 代理商： | FAN4174IS5X_NL |
FAN4174/FAN4274 Rev. 2D
9
www.fairchildsemi.com
F
Application Information
General Description
The FAN4174 amplifier family are single supply, general pur-
pose, voltage-feedback amplifiers. Fabricated on a bi-CMOS
process. The family features a rail-to-rail input and output and is
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 300mV below
ground and to 100mV above Vs, 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 150°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 FAN4174 will typically recover in
less than 500ns from an overdrive condition.
Figure 3 shows the FAN4174 amplifier in an overdriven
condition.
Figure 3.
Overdrive Recovery
Driving Capacitive Loads
The
Frequency Response vs. C
L
plot, illustrates the response of the
FAN4174 amplifier family. A small series resistance (R
s
) at the
output of the amplifier, illustrated in Figure 4, will improve stabil-
ity and settling performance. R
s
values in the
Frequency
Response vs. C
L
plot were chosen to achieve maximum band-
width with less than 2dB of peaking. For maximum flatness,
use a larger R
s
. Capacitive loads larger than 500pF 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 FAN4174 amplifier family requires a
300
series resistor to drive a 100pF load.
+
FAN4174
-
R
f
0.01
μ
F
6.8
μ
F
+
Out
In
+V
s
R
g
R
out
-
+
10k
V
o
V
in
Time (1
μ
s/div)
Output
Input
= 2.7V
V
S
V
0.1
3.0
2.5
2.0
1.5
1.0
0.5
0
-0.5
+
-
R
f
R
g
R
s
C
L
R
L
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