bt829bkrf ETC-unknow, bt829bkrf Datasheet - Page 83

• Manufacturer Part Number: bt829bkrf
• Description: Video Streamii Decoders
• Manufacturer: ETC-unknow

3.0 PC Board Layout Considerations
The layout should be optimized for lowest noise on the Bt829B power and ground
lines. Optimization is achieved by shielding the digital inputs and outputs and by
providing good decoupling. The lead length between groups of power and ground
pins should be minimized to reduce inductive ringing.
3.1 Ground Planes
The ground plane area should encompass all Bt829B ground pins, voltage refer-
ence circuitry, power supply bypass circuitry for the Bt829B, analog input traces,
any input amplifiers, and all the digital signal traces leading to the Bt829B.
VNEG). The layout for the ground plane should be set up so the two planes are at
the same electrical potential, but they should be isolated from each other in the
areas surrounding the chip. The return path for the current should be through the
digital plane. See Figure 3-1 for an example of ground plane layout.
Figure 3-1. Example of Ground Plane Layout
The Bt829B has digital grounds (GND) and analog grounds (AGND and
Ground
Digital
D829BDSA
Ground Return
(i.e., PCI Bus Connection)
1
Bt829B
50
Ground
Analog
73