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参数资料
| 型号： | FMS6346EMTC20X |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO20 |
| 封装： | MO-153AC, TSSOP-20 |
| 文件页数： | 2/14页 |
| 文件大小： | 424K |
| 代理商： | FMS6346EMTC20X |
2010 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FMS6346E Rev.2.0.10
10
FM
S6346E
—
Six-
C
h
annel,
Select
able
SD
/H
D
Video
Filt
er
D
river
wit
h
D
isable
Applications Information
Functional Description
The FMS6346E 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 10.
There is a 280mV offset from the DC input level to the
DC output level. VOUT =2 VIN +280mV.
0.0 -> 0.02V
0.3 -> 0.32V
0.65 -> 0.67V
1.0 -> 1.02V
VIN
0.28V
0.88V
1.58V
2.28V
Driven by:
DC-Coupled DAC Outputs
AC-Coupled and Clamped
Y, CV, R, G, B
VOUT
0.15V
0.5V
0.85V
VIN
0.58V
1.28V
1.98V
Driven by:
AC-Coupled and Biased
U, V, Pb, Pr, C
VOUT
Figure 10. Typical Voltage Levels
The FMS6346E offers three channels with internal
diode clamps and three channels with biasing 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
FMS6346E without an AC-coupling capacitor. The
worst-case sync-tip compression due to the clamp does
not exceed 7mV. The input level set by the clamp,
combined with the internal DC offset, keeps the output
within its acceptable range. When the input is AC
coupled, the diode clamp sets the sync-tip (or lowest
voltage) just below ground.
For symmetric signals like C, Pb, and Pr; the average
DC bias is fairly constant and the inputs are biased to
set the DC input voltage to approximately 600mV. 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 11.
YOUT
Driver
YIN
0.65V
800k
Figure 11. Input Clamp Circuit
I/O Congurations
For DC-coupled DAC drive with DC-coupled outputs,
use the conguration shown in Figure 12.
DVD or
STB
SoC
DAC
Output
75
Ω
LCVF
Clamp
Inactive
0V - 1.4V
Figure 12. DC-Coupled Inputs and Outputs
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 shown in Figure 13.
DVD or
STB
SoC
DAC
Output
LCVF
Clamp
Active
0.1μF
0V - 1.4V
75
Figure 13. AC-Coupled Inputs, DC-Coupled Outputs
When driven by an unknown external source or a
SCART switch with its own clamping circuitry, the inputs
should be AC coupled as shown in Figure 14.
75
LCVF
Clamp
Active
0.1μF
External video
source must
be AC coupled
0V - 1.4V
75
Figure 14. SCART Conguration with DC-Coupled
Outputs
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