FMS6363ACSX Datasheet, PDF (7/10 Pages) Fairchild Semiconductor – Three-Channel 7th-Order High-Definition VoltagePlus™ Video Filter Driver

The same method can be used for biased signals. The
Pb and Pr channels are baised to set the DC level to
500mV.
External video
source must
be AC coupled
0V -
0.1µ
LCVF
Clamp
Active
75
220µ
75
Figure 9. Biased SCART with DC-Coupled Outputs
The same circuits can be used with AC-coupled outputs
if desired.
DVD or
STB
SoC
DAC
Output
0V - 1.4V
0.1μ
LCVF
Clamp
Active
75Ω ^220μ
Figure 10. DC-Coupled Inputs, AC-Coupled Outputs
DVD or
STB
SoC
DAC
Output
0V - 1.4V
0.1μ
LCVF
Clamp
Active
75Ω
220μ
Power Dissipation
The FMS6363A output drive configuration must be
considered when calculating overall power dissipation.
Care must be taken not to exceed the maximum die
junction temperature. The following example can be
used to calculate the power dissipation and internal
temperature rise:
T_J = T_A + P_d • _JA
(1)
where:
P_d = P_CH1 + P_CH2 + P_CH3
(2)
P_CHx = V_CC • I_CH - (V_O2/R_L)
(3)
where:
V_O = 2V_IN + 0.280V
(4)
I_CH = (I_CC/3) + (V_O/R_L)
(5)
V_IN = RMS value of input signal
I_CC = 22mA
V_CC = 3.3V
R_L = channel load resistance
Board layout can also affect thermal characteristics.
Refer to the Layout Considerations section for details.
The FMS6363A is specified to operate with output
currents typically less than 50mA, more than sufficient
for a dual (75Ω) video load. Internal amplifiers are
current limited to a maximum of 100mA and should
withstand brief-duration short-circuit conditions. This
capability is not guaranteed.
Figure 11. AC-Coupled Inputs and Outputs
External video
source must
be AC coupled
0V -
0.1µ
75
LCVF
Clamp
Active
75
220µ
Figure 12. Biased SCART with AC-Coupled Outputs
Note:
1. The video tilt or line time distortion is dominated by
the AC-coupling capacitor. The value may need to
be increased beyond 220μF to obtain satisfactory
operation in some applications.
© 2008 Fairchild Semiconductor Corporation
FMS6363A • Rev. 2.0.2
7
www.fairchildsemi.com