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PDF: Considerations for Mixed Signal Circuit Board Design: How to ...

Download 0 times Source: www.analog.com // Topic: Electronic Circuit File Size: 86.37 kb // Total of Page: 8 Page(s) Share this info: Sample of page (click to enlarge) Short Desciption: compatible codec 'socket? (a PCB layout compatible. with both codecs) for these codecs include the following:. ? Input Circuit Design ... Content Inside: INTRODUCTION Analog Devices' AD1845 Parallel-Port, 16-Bit, Sound- PortÂ®, Stereo Codec and Crystal Semiconductor's CS4231 Parallel Interface, Multimedia Audio Codec are â€œpin-for-pinâ€ compatible. Many customers have had dif- ficulties using these codecs interchangeably because they have slightly different external interface require- ments and the parts' documentation recommend differ- ing power supply circuitry. These design details contribute to the challenges of PC OEMs trying to design a compatible â€œsocketâ€ (a PCB layout compatible with both codecs) for these highly popular audio codecs. This application note shows designers how to put a â€œsocketâ€ in their PC motherboard or plug-in card design that is compatible with both parts (with some minor as- sembly differences). In addition to the recommended design (provides the highest performance, but requires the most assembly differences), this note describes cost and performance tradeoffs that are available with â€œcompromiseâ€ components (reducing the number of as- sembly differences with compatible external circuitry). Table I lists the assembly differences between an AD1845 and CS4231 system for the recommended codec â€œsocket,â€ shown in Figure 1