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PDF FMS6143A Data sheet ( Hoja de datos )
| Número de pieza | FMS6143A | |
| Descripción | Low-Cost Three-Channel 6th-Order Standard Definition Video Filter Driver | |
| Fabricantes | Fairchild Semiconductor | |
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www.DataSheet4U.com
December 2009
FMS6143A
Low-Cost Three-Channel 6th-Order
Standard Definition Video Filter Driver
Features
Three 6th-Order 8MHz (SD) Filter
Drives Single AC- or DC-Coupled Video
Loads (150Ω)
Transparent Input Clamping
Single Supply: 3.3V
AC- or DC-Coupled Inputs and Outputs
DC-Coupled Output Eliminates AC-Coupling
Capacitor
Robust 8.5kV ESD Protection
Supply Voltage Range: 3.3V to 5.0V
Lead-Free SOIC-8 Package
Applications
Cable Set-Top Boxes
Satellite Set-Top Boxes
DVD Players
HDTV
Personal Video Recorders (PVR)
Video On Demand (VOD)
Description
The FMS6143A Low-Cost Video Filter (LCVF) is
intended to replace passive LC filters and drivers with a
low-cost integrated device. Three 6th-order filters
provide improved image quality compared to typical 2nd-
and 3rd-order passive solutions.
The FMS6143A may be directly driven by a DC-coupled
DAC output or an AC-coupled signal. Internal diode
clamps and bias circuitry may be used if AC-coupled
inputs are required (see Applications section for details).
The outputs can drive AC- or DC-coupled single (150Ω)
or dual (75Ω) video loads. DC coupling the outputs
removes the need for large output coupling capacitors.
The input DC levels are offset approximately +280mV at
the output (see Applications section for details).
Related Applications Notes
AN-8002 – FMS6418B 4:2:2 Application Note
AN-6024 – FMS6xxx Product Series Understanding
Analog Video Signal Clamps, Bias, DC Restore, and
AC or DC coupling Methods
AN-6041 – PCB Layout Considerations for Video Filter /
Drivers
Ordering Information
Part Number
FMS6143ACSX
Operating
Temperature Range
Package
-40°C to +85°C
8-Lead, Small Outline
Integrated Circuit (SOIC)
Eco Packing
Status Method
RoHS
Reel
Quantity
5000
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2009 Fairchild Semiconductor Corporation
FMS6143A • Rev. 1.0.0
www.fairchildsemi.com
1 page  
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Typical Performance Characteristics
Unless otherwise noted, TA = 25°C, VCC = 3.3V, RS = 37.5Ω, and AC-coupled output into 150Ω load.
Figure 3. Frequency Response
Figure 4. Frequency Response Flatness
© 2009 Fairchild Semiconductor Corporation
FMS6143A • Rev. 1.0.0
5
www.fairchildsemi.com
5 Page 
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Layout Considerations
General layout and supply bypassing play a major role
in high-frequency performance and thermal
characteristics. Fairchild offers a demonstration board
to guide layout and aide device evaluation. The demo
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.
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.
The distance from the device pin to the series termination
resistor should be no greater than 0.1 inches.
Recommended Routing/Layout Rules
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-degree 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.
Output Considerations
The FMS6143A outputs are DC offset from the input by
150mV; therefore, VOUT = 2 x VIN DC + 150mV. This
offset 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 FMS6143A 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
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
Figure 20. Termination Resistor Placement
Thermal Considerations
Since the interior of most systems; such as set-top
boxes, TVs, and DVD players; are at TA=+70ºC;
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.
Modeling techniques provide a first-order
approximation.
© 2009 Fairchild Semiconductor Corporation
FMS6143A • Rev. 1.0.0
11
www.fairchildsemi.com
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| PDF Descargar | [ Datasheet FMS6143A.PDF ] | |
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