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SGM9128YP Datasheet(PDF) 8 Page - SG Micro Corp

Part # SGM9128YP
Description  4-Channel, 6th-Order Video Filter Driver
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Manufacturer  SGMICRO [SG Micro Corp]
Direct Link  http://www.sg-micro.com
Logo SGMICRO - SG Micro Corp

SGM9128YP Datasheet(HTML) 8 Page - SG Micro Corp

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4-Channel, 6th-Order Video
SGM9128YP
Filter Driver for SD/HD (1080i)
8
SG Micro Corp
www.sg-micro.com
APPLICATION INFORMATION
Application Circuits
The SGM9128YP video filter 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.
The SGM9128YP provides an internal 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 SGM9128YP without an AC
coupling capacitor. When the input is AC-coupled, the clamp
sets the sync tip (or lowest voltage) just below ground. The
worst-case sync tip compression due to the clamp cannot
exceed 7mV. The input level set by the clamp, combined with
the internal DC offset, keeps the output within its acceptable
range.
I/O Configurations
For a DC-coupled DAC drive with DC-coupled outputs, use the
configuration in Figure 1.
DVD or
STB
SoC
DAC
Output
LCVF
Clamp
Inactive
0V - 1.4V
75Ω
Figure 1. DC-Coupled Inputs and Outputs
Alternatively, if the DAC’s average DC output level causes the
signal to exceed the range from 0V to 1.4V, it can be
AC-coupled as shown in Figure 2.
DVD or
STB
SoC
DAC
Output
LCVF
Clamp
Active
0V - 1.4V
75Ω
0.1µF
Figure 2. AC-Coupled Inputs, DC-Coupled Outputs
The same circuits can be used with AC-coupled outputs if
desired.
DVD or
STB
SoC
DAC
Output
LCVF
Clamp
Active
0V - 1.4V
75Ω
0.1μF
220μF
Figure 3. AC-Coupled Inputs and Outputs
NOTE: 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.
Power Dissipation
The SGM9128YP 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 equations can be used to calculate
the power dissipation and internal temperature rise.
TJ = TA + PD • θJA
(1)
where:
PD = PCH1 + PCH2 + PCH3
(2)
PCHX = VCC • ICH - (VO
2/RL)
(3)
where:
VO = 2VIN + 0.55V
(4)
ICH = (ICC/3) + (VO/RL)
(5)
VIN = RMS value of input signal
ICC = 65mA
VCC = 5.0V
RL = channel load resistance
Board layout can also affect thermal characteristics. Refer to
the Layout Considerations section for details.
The SGM9128YP 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 80mA and should withstand brief-duration short-circuit
conditions. This capability is not guaranteed.


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