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KM4100IT5 Datenblatt(PDF) 7 Page - Fairchild Semiconductor

Teilenummer KM4100IT5
Bauteilbeschribung  Low Cost, 2.7V and 5V, 260MHz Rail-to-Rail Amplifiers
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Hersteller  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

KM4100IT5 Datenblatt(HTML) 7 Page - Fairchild Semiconductor

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REV. 1A February 2001
7
General Description
The KM4100/KM4101 are single supply, general
purpose, voltage-feedback amplifiers fabricated on a
complementary bipolar process using a patent pending
topology. They feature a rail-to-rail output stage and
are unity gain stable. Both gain bandwidth and slew
rate are insensitive to temperature.
The common mode input range extends to 300mV
below ground and to 1.2V below Vs. 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.
The design uses a Darlington output stage. The output
stage is short circuit protected and offers “soft”
saturation protection that improves recovery time.
The typical circuit schematic is shown in Figure 1.
Figure 1: Typical Configuration
At non-inverting gains other than G = +1, keep Rg
below 1k
Ω to minimize peaking; thus, for optimum
response at a gain of +2, a feedback resistor of 1k
Ω is
recommended.
Figure 2 illustrates the KM4100/
KM4101 frequency response with both 1k
Ω and 2kΩ
feedback resistors.
Enable/Disable Function (KM4101)
The KM4101 offers an active-low disable pin that can
be used to lower its supply current. Leave the pin
floating to enable the part. Pull the disable pin to the
negative supply (which is ground in a single supply
application) to disable the output. During the disable
condition, the nominal supply current will drop to
below 127
µA and the output will be at high impedance
with about 2pF capacitance.
Figure 2: Frequency Response vs. Rf
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 reliability degradation will occur. If the maximum
junction temperature exceeds 175°C for an extended
time, device failure may occur.
The KM4100/KM4101 are short circuit protected.
However, this may not guarantee that the maximum
junction temperature (+150°C) is not exceeded under
all conditions. Follow the maximum power derating
curves shown in Figure 3 to ensure proper operation.
Figure 3: Power Derating Curves
Overdrive Recovery
For an amplifier, an overdrive condition 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 KM4100/KM4101 will typically recover
in less than 20ns from an overdrive condition. Figure
4 shows the KM4100 in an overdriven condition.
+
-
KM4100
Rf
0.01
µF
6.8
µF
Out
In
+Vs
+
Rg
Frequency Reponse vs. Rf
Frequency (MHz)
1
10
100
Rf = 2kΩ
Rf = 1kΩ
G = 2
RL = 2kΩ
Vs = +5V
Maximum Power Dissipation
Ambient Temperature ( C)
-50
-30
-10
10
30
50
70
90
SOIC-8 lead
0
0.5
1.0
1.5
2.0
SOT23-6 lead
SOT23-5 lead
KM4100/KM4101
DATA SHEET


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