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CS4237B Datasheet(PDF) 93 Page - Cirrus Logic |
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CS4237B Datasheet(HTML) 93 Page - Cirrus Logic |
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93 / 114 page  interface due to transient currents during bus switching. SGND1-4 are the substrate grounds and should also be connected to the digital ground plane to minimize coupling into the ana- log section. Figure 33 shows the recommended positioning of the decoupling capacitors. The ca- pacitors must be on the same layer as, and close to, the part. The vias shown go through to the ground and power plane layers. Vias, power sup- ply traces, and REFFLT traces should be as large as possible to minimize the impedance. POWER SUPPLIES The power supply providing analog power should be as clean as possible to minimize cou- pling into the analog section and degrading analog performance. The VD1 is isolated from the rest of the power supply pins and provide digital power for the asynchronous parallel ISA bus (except for DRQA). The VD1 pin can be connected directly to the system digital power supply. VD1 can also be connected to a 3.3V supply providing a 3.3V ISA interface. When connected to a 3.3V supply, all ISA bus input pins (SA15-0, SD7-0, DACKs, etc.) must be at 3.3V levels (not 5V), with the exception of the DRQA pin. DRQA is internally connected to the VDF supplies and remains a 5 Volt pin even when the ISA bus is run at 3.3 Volts. When the ISA bus is powered from 3.3 Volts, DRQA can be be used through a level translator, or DRQA can remain used. If DRQA is not used, all references to this pin should be removed in the PnP Resource data. Even though the ISA bus is at 3.3V, the peripheral port is still at a 5V potential including XD7-0 and all chip select and address pins. VDF1 through VDF4 provide power to internal digital sections of the codec and should be qui- eter than VD1. This can be achieved by using a 1 Digital Ground Analog Ground Crystal Part Power Connector Digital Ground Noise Di gita l G rou nd No ise Di git al Gr ou nd No ise Figure 31. Suggested Motherboard Layout DS213PP4 CS4237B 93 |
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Similar Description - CS4237B |
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