SGM9135 Datasheet, PDF (9/12 Pages) SG Micro Corp – 4-Channel, 6th-Order Video Filter Driver

SGM9135
APPLICATION INFORMATION
Recommended Routing/Layout Rules
 Do not run analog and digital signals in parallel.
 Use separate analog and digital power planes to supply
power.
 Do not run traces on top of the ground plane.
 Run no traces over ground/power splits.
 Avoid routing at 90-degree angles.
 Minimize clock and video data trace length differences.
 Include 0.01μF and 0.1μF ceramic power supply bypass
capacitors.
 Place the 0.1μF capacitor within 0.1 inches of the device
power pin.
 Place the 0.01μF capacitor within 0.75 inches of the device
power pin.
 For multi-layer boards, use a large ground plane to help
dissipate heat.
 For two-layer boards, use a ground plane that extends
beyond the device body at least 0.5 inches on all sides.
Include a metal paddle under the device on the top layer.
 Minimize all trace lengths to reduce series inductance.
 Place a 75Ω series resistor within 0.5 inches of the output
pin to isolate the output driver from board parasitics.
4-Channel, 6th-Order Video
Filter Driver for SD/HD (1080p)
Thermal Considerations
Since the interior of systems such as set-top boxes, TVs and
DVD players are at +70℃, consideration must be given to
providing an adequate heat sink for the device package for
maximum heat dissipation. When designing a system board,
determine how much power each device dissipates. Ensure that
devices of high power are not placed in the same location, such
as directly above (top plane) or below (bottom plane) each other
on the PCB.
PCB Thermal Layout Considerations
 Understand the system power requirements and
environmental conditions.
 Maximize thermal performance of the PCB.
 Consider using 70μm of copper for high-power designs.
 Make the PCB as thin as possible by reducing FR4
thickness.
 Use vias in the power pad to tie adjacent layers together.
 Remember that baseline temperature is a function of board
area, not copper thickness.
 Consider modeling techniques a first-order approximation.
SG Micro Corp
9
www.sg-micro.com