|
|
PDF FFMS6144A Data sheet ( Hoja de datos )
| Número de pieza | FFMS6144A | |
| Descripción | 6th Order SD Video Filter Driver | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de FFMS6144A (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
|
No Preview Available !
December 2009
FMS6144A
Low-Cost, Four-Channel, 6th-Order SD Video Filter Driver
Features
Four-Channel 6th-Order 8MHz (SD) Filter
Drives Single, AC- or DC-Coupled Video Loads
(150Ω)
Transparent Input Clamping
Supply Range: 3.3V to 5.0V
AC- or DC-Coupled Inputs and Outputs
Robust 9kV ESD Protection
Lead-Free TSSOP 14-Pin Package
Applications
Cable Set-Top Boxes
Satellite Set-Top Boxes
DVD Players
HDTV
Personal Video Recorders (PVR)
Video On Demand (VOD)
www.DataSheet4U.com
Description
The FMS6144A Low-Cost Video Filter (LCVF) is
intended to replace passive LC filters and drivers with a
low-cost integrated device. Four 6th-order filters provide
improved image quality compared to typical 2nd and 3rd
order passive solutions.
The FMS6144A 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 the 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 the 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
FMS6144AMTC14X
Operating Temperature Range
-40°C to +85°C
Eco Status
RoHS
Package
14-Lead
TSSOP
Packing
Method
2500 per
Reel
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
© 2009 Fairchild Semiconductor Corporation
FMS6144A • Rev. 1.0.1
www.fairchildsemi.com
1 page  
Typical Performance Characteristics
Unless otherwise noted, TA = 25°C, VCC = 2.7V, RS = 37.5Ω, and AC-coupled output into 150Ω load.
www.DataSheet4U.com
Figure 3. Delay vs. Frequency
Figure 4. Frequency Response
© 2009 Fairchild Semiconductor Corporation
FMS6144A • Rev. 1.0.1
5
www.fairchildsemi.com
5 Page 
Layout Considerations
General layout and supply bypassing play a major role
in high-frequency performance and thermal
characteristics. Fairchild offers a four-layer board with
full power and ground planes board to guide layout and
aid 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 best results,
follow the steps and recommended routing rules below.
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. 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.
www.DataSheet4MU.icnoimmize all trace lengths to reduce series
inductance.
Output Considerations
The outputs are DC offset from the input by 150mV
therefore VOUT = 2 • VIN DC + 150mV. This offset is
required for optimal performance from the output driver
and is held at the minimum value to decrease the
standing DC current into the load. Since the FMS6144A
has a 2x (6dB) gain, the output is typically connected
via a 75Ω series back-matching resistor followed by the
75Ω video cable. Because of 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 passes
the lowest frequency content in the video signal and that
line time distortion (video tilt) is kept as low as possible.
Thermal Considerations
Since the interior of most systems, such as set-top
boxes, TVs, and DVD players; are at +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 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
FMS6144A • Rev. 1.0.1
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet FFMS6144A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| FFMS6144A | 6th Order SD Video Filter Driver | Fairchild Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |