參數(shù)資料
型號(hào)： AD1885
廠商： ANALOG DEVICES INC
元件分類(lèi)： ADC
英文描述： AC’97 SoundMAX Codec
中文描述： 16-BIT CONVERTER SUBSYSTEM ADC, SERIAL ACCESS, PDSO28
文件頁(yè)數(shù)： 26/27頁(yè)
文件大?。?/td> 291K
代理商： AD1885
AD1885
–26–
REV. 0
PC_BEEP INPUT CONNECTIONS
The recommended PC_BEEP input circuit is shown below. Under most cases the PC_BEEP signal should be attenuated, filtered and
then ac-coupled into the Codec.
TO CODEC PC_BEEP INPUT
PC_BEEP (FROM ICH)
Figure 17. Recommended PC_BEEP Connections
GROUNDING AND LAYOUT
To reduce noise and emissions, Analog Devices recommends a split ground plane as shown in Figure 18. 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
PLANES AT OR NEAR CODEC.
ANALOG
GROUND PLANE
DIGITAL
GROUND PLANE
AD1885
Figure 18. 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.
If a power plane layer is being used in the system design, it is recommended that the analog power plane for the Codec also be split
(mirroring the analog ground plane). In this case, the analog power supply ferrite bead should bridge the isolation trench, close to
the Codec location.
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD1885JST 制造商:Analog Devices 功能描述:Audio Codec 2ADC / 2DAC 16-Bit 48-Pin LQFP 制造商:Rochester Electronics LLC 功能描述:AC97 VERSION 2.1 CODEC - Tape and Reel 制造商:Analog Devices 功能描述:IC CODEC AC'97 VERSION 2.1
AD1885JST-REEL 制造商:Analog Devices 功能描述:Audio Codec 2ADC / 2DAC 16-Bit 48-Pin LQFP T/R 制造商:Rochester Electronics LLC 功能描述:AC97 VERSION 2.1 CODEC - Tape and Reel
AD1885JSTZ 制造商:Analog Devices 功能描述:IC CODEC STEREO AC'97 48LQFP
AD1885JSTZ 制造商:Analog Devices 功能描述:TV / Video IC
AD1885JSTZKL1 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述:
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