參數(shù)資料
型號(hào)： AD1881A
廠商： Analog Devices, Inc.
元件分類： Codec
英文描述： AC’97 SoundMAX Codec
中文描述： AC\u0026#39;97聲卡SoundMAX編解碼器
文件頁(yè)數(shù)： 24/26頁(yè)
文件大?。?/td> 261K
代理商： AD1881A
AD1881A
–24–
REV. 0
EAPD/CHAIN_IN
MONO_OUT
LINE_OUT_L
LIN_OUT_R
AD1881A
NC
LEFT IN
SHUTDOWN
SE/BTL
GND
RIGHT IN
NC
NC
LEFT OUT/BLT
VDO
BTL+
BYPASS
RIGHT OUT
NC
U2
SSM2250RU
C4
0.33 F
C7
0.33 F
R4
49.9k
R6
49.9k
NC = NO CONNECT
R2
49.9k
U1
R7
49.9k
C8
0.1 F
C1
1 F
R1
100k
C2
100 F
R3
1k
FB
600Z
C3
470pF
C5
100 F
R5
1k
FB
600Z
C6
470pF
F1
F2
STEREO
HP/SPEAKER
OUTPUT
J1
STEREO
3.5mm JACK
LS1
INTERNAL
MONO
SPEAKER
4
5AV
DD
Figure 15. Using the SSM2250 Amplifier for Stereo and Mono Output
GROUNDING AND LAYOUT
To reduce noise and emissions, Analog Devices recommends a split ground plane as shown in Figure 16. The purpose of splitting the
ground plane is to create a low noise analog area that is somewhat isolated from the digital ground current noise generated by the
system’s logic. All the analog circuitry should be placed on the analog ground plane area.
For reference purposes, and to return power supply currents, the analog and digital ground planes must be connected at some point,
ideally a small bridge under or near the Codec should be provided. A 0
resistor or a ferrite bead should also be considered since
these allow some flexibility in optimizing the layout to meet EMC requirements.
PIN 1
ISOLATION
TRENCH
CONNECT SPLIT GROUND
ANALOG
GROUND PLANE
DIGITAL
GROUND PLANE
AD1881A
Figure 16. Recommended Split Ground Plane
ANALOG POWER SUPPLY
To minimize audio noise, the Codec analog power supply (AVDD) should be well decoupled and regulated. In PC systems it is rec-
ommended that the analog supply be derived from the 12 V PC power supply using a localized linear voltage regulator. Preferably,
the analog power supply should be connected to the Codec’s analog section using a ferrite bead.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD1881AJST 制造商:Rochester Electronics LLC 功能描述:AC97 VERSION 2.1 CODEC - Bulk 制造商:Analog Devices 功能描述: 制造商:Analog Devices 功能描述:IC CODEC AC'97 VERSION 2.1
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AD1881JST 制造商:Analog Devices 功能描述:AC'97 SOUNDMAX CODEC 制造商:Analog Devices 功能描述:SOUNDCARD CIRCUITS, 48 Pin, Plastic, QFP
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