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KM4200 Datasheet(PDF) 8 Page - Fairchild Semiconductor

Part No. KM4200
Description  Dual, Low Cost, 2.7V & 5V, 260MHz Rail-to-Rail Amplifier
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

KM4200 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 KM4200. 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.
When evaluating only one channel, complete the
following on the unused channel
1. Ground the non-inverting input
2. Short the output to the inverting input
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 KEB006 evaluation board is 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 KM4200 is
not directly connected to the ground plane.
Figure 6: Evaluation Board Schematic
Overdrive Recovery
Time (20ns/div)
Output
Input
RL = 2kΩ
Vin =2Vpp
G = 5
Rf = 1kΩ
+
-
Rf
Rg
Rs
CL
RL
Eval Board
Description
Products
KEB006
Dual Channel, Dual Supply
KM4200IC8
8 lead SOIC
KEB010
Dual Channel, Dual Supply
KM4200IM8
8 lead MSOP
DATA SHEET
KM4200


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