參數(shù)資料
型號(hào)： KS0165
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： Multimedia Audio(波表合成芯片)
中文描述： 多媒體音響（波表合成芯片）
文件頁(yè)數(shù)： 19/20頁(yè)
文件大小： 83K
代理商： KS0165
KS0165
MULTIMEDIA AUDIO
19/
20
Audio Board Design & PCB Layout Guidelines(Continued)
Digital Signal Routing
Use of vias should be minimized, particularly on
high speed signals, such as clocks. For this reason,
hand-routing is
strongly
recommended, rather than
using an auto-router. Even the auto-routers
available today will use far more vias than an
experienced hand-router. Our evaluation boards are
all completely hand-routed. Keep all unbuffered PC-
bus signals as short as possible, preferably no more
than 1-2
.
Also rigorously avoid passing digital
signals over any splits in the planes. Keep all
crystals as close as possible to the other
components to which they are connected, and, if
possible, surround their traces with GND traces.
Never
allow an oscillator or clock signal to cross the
GND/AGND plane split! Securely attach, by
soldering, the crystal case to its associated ground
plane, usually GND.
Supply Bypassing
In the digital section of the board, be sure no VCC
pin is more than about 1
from a bypass capacitor.
In the analog section, this may be relaxed
somewhat, but try to ensure that each supply pin is
within at least 1.5-2
of a bypass capacitor. In both
the digital and analog sections, evenly distribute the
bypass capacitors, and use an even mix of 0.1
μ
F
and 0.001
μ
F capacitors. For the KS0165, one
bypass capacitor for each VCC pin is
recommended. All bypass capacitors should be
routed such that the connection is from the VCC
and GND planes to the capacitor, and then from the
capacitor to the IC pins.
EMI Suppression
Adequate EMI suppression can most easily be
achieved through careful PCB layout, and the use
of small capacitors to GND/AGND, rather than
ferrite beads. Since the analog input and output
signal points are all (relatively) low impedance,
small capacitors(1-10nF) can be connected
between these points and AGND with no
appreciable effect on audio performance. All such
capacitors should be places as close as possible to
the connectors, and the traces leaving them (going
to the connectors) should not pass near any
unfiltered traces which might couple-in unwanted
high-frequency noise.
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