FMS6363ACSX Fairchild Semiconductor, FMS6363ACSX Datasheet - Page 6

• 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
1.0 -> 1.02V
0.65 -> 0.67V
0.3 -> 0.32V
0.0 -> 0.02V
2.28V
1.58V
0.88V
0.28V
There is a 280mV offset from the DC input level to the
DC output level. V
0.85V
0.5V
0.15V
1.98V
1.28V
0.58V
Application Information
Application Circuits
The FMS6363A low-cost video filter (LCVF) provides
6dB gain from input to output. In addition, the input is
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 Figure 4:
The FMS6363A provides an internal diode clamp to
support AC coupled input signals. If the input signal
does not go below ground, the input clamp does not
operate. This allows DAC outputs to directly drive the
FMS6363A without an AC coupling capacitor. When the
input is AC coupled, the diode clamp sets the sync tip
(or lowest voltage) just below ground. The worst-case
sync tip compression due to the clamp can not exceed
7mV. The input level set by the clamp, combined with
the internal DC offset, keeps the output within its
acceptable range.
For symmetric signals like Chroma, U, V, Pb, and Pr;
the average DC bias is fairly constant and the inputs
can be AC-coupled. DAC outputs can also drive these
same signals without the AC coupling capacitor. A
conceptual illustration of the input clamp circuit is shown
in Figure 5.
Figure 4. Typical Voltage Levels
V
V
V
OUT
OUT
OUT
IN
= 2 * V
V
IN
IN
+ 280mV.
Driven by:
DC-Coupled DAC Outputs
AC-Coupled and Clamped
Y, CV, R, G, B
Driven by:
AC-Coupled and Biased
U, V, Pb, Pr, C

6
I/O Configurations
For a DC-coupled DAC drive with DC-coupled outputs,
use this configuration:
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:
When the FMS6363A is driven by an unknown external
source or a SCART switch with its own clamping
circuitry, the inputs should be AC-coupled like this:
0.65V
External video
source must
be AC coupled
Figure 7. AC-Coupled Inputs, DC-Coupled Outputs
Y IN
DVD or
DVD or
Output
Output
DAC
STB
SoC
DAC
STB
SoC
Figure 8. SCART with DC-Coupled Outputs
Figure 6. DC-Coupled Inputs and Outputs
Figure 5. Input Clamp Circuit
Driver
0V - 1.4V
75Ω
0.1μ
Y OUT
0.1μ
0V - 1.4V
75Ω
75Ω
0V - 1.4V
Video Cables
Video Cables
Inactive
Clamp
LCVF
Clamp
Active
LCVF
Clamp
Active
LCVF
75Ω
75Ω
www.fairchildsemi.com
75W
75Ω
75Ω
LOAD1
LOAD2
(optional)