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KM4100 Datasheet(PDF) 8 Page - Fairchild Semiconductor

Part No. KM4100
Description  Low Cost, 2.7V and 5V, 260MHz Rail-to-Rail Amplifiers
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

KM4100 Datasheet(HTML) 8 Page - Fairchild Semiconductor

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8
REV. 1A February 2001
Figure 4: Overdrive Recovery
Driving Capacitive Loads
The Frequency Response vs. CL plot on page 4,
illustrates the response of the KM4100 and KM4101. A
small series resistance (Rs) at the output of the amplifier,
illustrated in Figure 5, will improve stability and
settling performance.
Rs values in the Frequency
Response vs. CL plot were chosen to achieve maximum
bandwidth with less than 1dB of peaking. For maximum
flatness, use a larger Rs.
Figure 5: Typical Topology for driving
a capacitive load
Layout Considerations
General layout and supply bypassing play major roles
in high frequency performance. Fairchild has evaluation
boards to use as a guide for high frequency layout
and to aid in device testing and characterization.
Follow the steps below as a basis for high frequency
layout:
s
Include 6.8
µF and 0.01µF ceramic capacitors
s
Place the 6.8
µF capacitor within 0.75 inches
of the power pin
s
Place the 0.01
µF capacitor within 0.1 inches
of the power pin
s
Remove the ground plane under and around the
part, especially near the input and output pins to
reduce parasitic capacitance
s
Minimize all trace lengths to reduce
series inductances
Refer to the evaluation board layouts shown in Figure
7 for more information.
Evaluation Board Information
The following evaluation boards are available to aid
in the testing and layout of this device:
Evaluation board schematics and layouts are shown in
Figure 6 and Figure 7.
The KEB002 and KEB003 evaluation boards are built
for dual supply operation. Follow these steps to use
the board in a single supply application:
1. Short -Vs to ground
2. Use C3 and C4, if the -Vs pin of the KM4100 or
KM4101 is not directly connected to the
ground plane.
Figure 6: Evaluation Board Schematic
(SOIC pinout shown)
Overdrive Recovery
Time (20ns/div)
Output
Input
RL = 2kΩ
Vin =2Vpp
G = 5
Rf = 1kΩ
+
-
Rf
Rg
Rs
CL
RL
Eval Board
Description
Products
KEB002
Single Channel,
KM4100IT5,
Dual Supply 5 & 6 lead SOT23 KM4101IT6
KEB003
Single Channel, Dual Supply
KM4100IC8,
8 lead SOIC
KM4101IC8
DATA SHEET
KM4100/KM4101


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