FMS6363ACSX Fairchild Semiconductor, FMS6363ACSX Datasheet - Page 8

• Manufacturer Part Number: FMS6363ACSX
• Description: Display Drivers & Controllers 3 Channel HD Video Filter Driver
• Manufacturer: Fairchild Semiconductor

Specifications of FMS6363ACSX

• Driver Type: Video Filter Drivers
• Operating Supply Voltage: 3.3 V to 5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-8
• Minimum Operating Temperature: - 40 C
• Supply Current: 22 mA, 34 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

© 2008 Fairchild Semiconductor Corporation
FMS6363A Rev. 2.0.1
Layout Considerations
General layout and supply bypassing play a major role
in
characteristics. Fairchild offers a evaluation board to
guide layout and aid device evaluation. The evaluation
board is a four-layer board with full power and ground
planes. Following this layout configuration provides
optimum performance and thermal characteristics for
the device. For the best results, follow the steps and
recommended routing rules listed below.
Recommended Routing / Layout Rules
Output Considerations
The FMS6363A outputs are DC offset from the input by
150mV; therefore, V
is required to obtain optimal performance from the
output driver and is held at the minimum value to
decrease the standing DC current into the load. Since
the FMS6363A has a 2x (6dB) gain, the output is
typically connected via a 75Ω-series back-matching
resistor followed by the 75Ω video cable. Due to the
inherent divide-by-two of this configuration, the blanking
level at the load of the video signal is always less than
1V. When AC-coupling the output, ensure that the
coupling capacitor of choice passes the lowest
frequency content in the video signal and that line time
Do not run analog and digital signals in parallel.
Use separate analog and digital power planes to
supply power.
Traces should run on top of the ground plane at all
times.
No trace should run over ground/power splits.
Avoid routing at 90° angles.
Minimize clock and video data trace length
differences.
Include 10μF and 0.1μF ceramic power supply
bypass capacitors.
Place the 0.1μF capacitor within 0.1 inches of the
device power pin.
Place the 10μF capacitor within 0.75 inches of the
device power pin.
For multi-layer boards, use a large ground plane to
help dissipate heat.
For two-layer boards, use a ground plane that
extends beyond the device body at least 0.5 inches
on all sides. Include a metal paddle under the
device on the top layer.
Minimize all trace lengths to reduce series
inductance.
high-frequency
OUT
performance
= 2•V
IN
DC+150mV. This offset
and
thermal
8
distortion (video tilt) is kept as low as possible. The
selection of the coupling capacitor is a function of the
subsequent circuit input impedance and the leakage
current of the input being driven. To obtain the highest
quality output video signal, the series termination
resistor must be placed as close to the device output
pin as possible. This greatly reduces the parasitic
capacitance and inductance effect on the output driver.
Distance from the device pin to the series termination
resistor should be no greater than 0.1 inches.
Thermal Considerations
Since the interior of most systems, such as set-top
boxes,
consideration must be given to providing an adequate
heat sink for the device package for maximum heat
dissipation. When designing a system board, determine
how much power each device dissipates. Ensure that
devices of high power are not placed in the same
location, such as directly above (top plane) or below
(bottom plane), each other on the PCB.
PCB Thermal Layout Considerations
Understand the system power requirements and
environmental conditions.
Maximize thermal performance of the PCB.
Consider using 70μm of copper for high-power
designs.
Make the PCB as thin as possible by reducing FR4
thickness.
Use vias in the power pad to tie adjacent layers
together.
Remember that baseline temperature is a function
of board area, not copper thickness.
Use modeling techniques to provide a first-order
approximation.
Figure 13.
TVs,
and
Termination Resistor
DVD
players, are at +70ºC;
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