Preliminary
+
10k
DATA SHEET
FAN4113
8
Preliminary September 2001
Application Information
General Description
The FAN4113 is single supply, general purpose, voltage-feed-
back amplifier. The FAN4113 is fabricated on a complimenta-
ry bipolar process, 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
.
Figure 2:
TBD
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. It 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 FAN4113 will typically recover
in less than 50ns from an overdrive condition. Figure 3
shows the FAN4113 in an overdriven condition.
Figure 3: Overdrive Recovery
Driving Capacitive Loads
The Frequency Response vs. CLplot, illustrates the response
of the FAN4113. A small series resistance (Rs) at the output
of the amplifier, illustrated in Figure 4, will improve stability
and settling performance. Rsvalues in the Frequency Response
vs. CLplot were chosen to achieve maximum bandwidth with
less than 2dB of peaking. For maximum flatness, use a larger
Rs. As the plot indicates, the FAN4113 can easily drive a
50pF capacitive load without a series resistance.
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 FAN4113 requires a
TBD
series resistor to drive a 100pF load.
+
FAN4113
-
R
f
0.01
μ
F
6.8
μ
F
+
Out
In
+V
s
R
g
I
Time (10
μ
s/div)
Output
Input
-
V
o
FAN4113
V
in
+
R
f
R
g
R
s
C
L
R
L