cx25870 Conexant Systems, Inc., cx25870 Datasheet - Page 132

• Manufacturer Part Number: cx25870
• Description: Video Encoder With Adaptive Flicker Filtering And Hdtv Output
• Manufacturer: Conexant Systems, Inc.

3.0 PC Board Considerations
3.2 Power and Ground Planes
Figure 3-1. Power Plane Illustration
3-2
S-Video
Composite #1
Composite #2
Chrome
Luma
Bracket
Analog
3.3 VAA-CX870
3.2 Power and Ground Planes
For optimum performance, a common digital and analog ground plane and a
common digital and analog power plane are recommended. The power plane
should provide power to all CX25870/871 power pins, reference voltage (VREF)
circuitry, and COMP decoupling.
power plane (VCC) at a single point through a ferrite bead, as illustrated in
Figures 3-1
CX25870/871. The bead provides resistance to switching currents by acting as a
resistor at high frequencies. A low-resistance bead should be used, such as
Ferroxcube 5659065-3B, Fair-Rite 2723021447, or TDK BF45-4001. See
Table 3-1
Conexant
CX25870
Decoder
(Bt835)
Video
5V
The CX25870/871 power plane should be connected to the graphics system
Oscillator
for a typical parts list for key passive components.
Clocks
and 3-2. This bead should be located within 3 inches of the
3.3 V
Conexant
Ferrite Bead
o VCC3.3
PCI or AGP Connector
o VCC3.3
Data
Flicker-Free Video Encoder with Ultrascale Technology
4 layer board
plane order:
BOTTOM
TOP
CX25870/871
Signals
Signals
PWR
GND
100381B
100381_017