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PDF FMS6363 Data sheet ( Hoja de datos )
| Número de pieza | FMS6363 | |
| Descripción | Low Cost Three Channel 6th Order High Definition Video Filter Driver | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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December 2005
FMS6363
Low Cost Three Channel 6th Order High Definition Video
Filter Driver
Features
■ Three sixth-order 30MHz (HD) filters
■ Transparent input clamping
■ Single video load drive (2Vpp, 150Ω, AV = 6dB)
■ AC or DC-coupled inputs
■ AC or DC-coupled outputs
■ DC-coupled outputs eliminate AC-coupling capacitors
■ 5V only
■ Robust 8KV ESD protection
■ Lead (Pb) Free package- SOIC-8
Applications
■ Cable and Satellite set top boxes
■ DVD players
■ HDTV
■ Personal Video Recorders (PVR)
■ Video On Demand (VOD)
Block Diagram
Description
The FMS6363 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 lower order passive solutions.
The FMS6363 may be directly driven by a DC-coupled DAC out-
put or an AC-coupled signal. Internal diode clamps and bias cir-
cuitry may be used if AC-coupled inputs are required (see
applications section for details).
The outputs can drive AC or DC-coupled single (150Ω) loads.
DC-coupling the outputs removes the need for output coupling
capacitors. The input DC levels will be offset approximately
+280mV at the output (see applications section for details).
IN1 Transparent Clamp
6dB
IN2 Transparent Clamp
6dB
IN3 Transparent Clamp
6dB
30MHz, 6th order
OUT1
OUT2
OUT3
FMS6363 Rev. 1B
1 www.fairchildsemi.com
©2005 Fairchild Semiconductor Corporation
1 page  
Applications Information
Functional Description
The FMS6363 Low Cost Video Filter (LCVF) provides 6dB gain
from input to output. In addition, the input will be slightly offset to
optimize the output driver performance. The offset is held to the
minimum required value to decrease the standing DC current
into the load. Typical voltage levels are shown in the diagram
below.
1.02V
0.32V
0.02V
Vin
2.28V
0.88V
0.28V
Vout
Driven by:
DC-Coupled DAC Outputs or
AC-Coupled and Clamped
Y, R, G, B, CV
There will be a 280mV offset from the DC input level to
the DC output level.
Vout = 2 * Vin + 280mV
coupling capacitor. A conceptual illustration of the input clamp
circuit is shown below:
0.65V
YIN
YOUT
Driver
800kΩ
Figure 7. Input Clamp Circuit
I/O Configurations
For DC-coupled DAC drive with DC-coupled outputs, use this
configuration:
DVD or
STB
SoC
DAC
Output
0V - 1.4V
LCVF
Clamp
Inactive
75Ω
0.85V
0.5V
0.15V
Vin
1.98V
1.28V
0.58V
Vout
Driven by:
DC-Coupled DAC Outputs
AC-Coupled and Biased
U, V, Pb, Pr, C
Figure 6. Typical Voltage Levels
The FMS6363 provides an internal diode clamp to support AC-
coupled input signals. If the input signal does not go below
ground, the input clamp will not operate. This allows DAC out-
puts to directly drive the FMS6363 without an AC coupling
capacitor. The worst-case sync tip compression due to the
clamp will not exceed 7mV. The input level set by the clamp
combined with the internal DC offset will keep the output within
its acceptable range. When the input is AC-coupled, the diode
clamp will set the sync tip (or lowest voltage) just below ground.
For symmetric signals like C, U, V, Cb, Cr, Pb and Pr, the aver-
age DC bias is fairly constant and the inputs can be AC-coupled
with the addition of a pull-up resistor to set the DC input voltage.
DAC outputs can also drive these same signals without the AC
Figure 8. DC-coupled inputs and outputs
Alternatively, if the DAC’s average DC output level causes the
signal to exceed the range of 0V to 1.4V, it can be AC-coupled
as follows:
DVD or
STB
SoC
DAC
Output
0V - 1.4V
0.1u
LCVF
Clamp
Active
75Ω
Figure 9. AC-coupled inputs, DC-coupled outputs
When the FMS6363 is driven by an unknown external source or
a SCART switch with its own clamping circuitry the inputs
should be AC-coupled as follows:
External Video
source must
be AC-coupled.
0V - 1.4V
0.1u
75Ω
LCVF
Clamp
Active
75Ω
Figure 10. SCART with DC-coupled outputs
FMS6363 Rev. 1B
5 www.fairchildsemi.com
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet FMS6363.PDF ] | |
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