參數(shù)資料
型號: BT848A
英文描述: Single-Chip Video Capture for PCI
中文描述: 單芯片的PCI視頻捕捉
文件頁數(shù): 89/141頁
文件大?。?/td> 1149K
代理商: BT848A
Brooktree
79
L848A_A
PC B
OARD
L
AYOUT
C
ONSIDERATIONS
The layout should be optimized for lowest noise on the Bt848 power and ground
lines by shielding the digital inputs/outputs and providing good decoupling. The
lead length between groups of power and ground pins should be minimized to re-
duce inductive ringing.
Ground Planes
The ground plane area should encompass all Bt848 ground pins, voltage reference
circuitry, power supply bypass circuitry for the Bt848, the analog input traces, any
input amplifiers, and all the digital signal traces leading to the Bt848.
The Bt848 has digital grounds (GND) and analog grounds (AGND and VNEG).
The layout for the ground plane should be such that the two planes are at the same
electrical potential, but they should be isolated from each other in the areas sur-
rounding the chip. Also, the return path for current should be through the digital
plane. See Figure 38.
Figure 38. Example Ground Plane Layout
Bt848
1
121
Analog
Ground
Digital
Ground
Ground Return
(i.e. PCI Bus Connection)
C
41
81
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