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Re: De-coupling caps
Decoupling - used along power supply pins to store charge temporarily, desirably for the time it takes for charge to arrive from the large PSU unit. To improve timing, large capacitances are placed locally for few blocks/sections.
small value capacitors, respond better to...
Also know that, the signal chooses its return path. we designers have to be careful to provide it with fewer option.
When you are running a supply plane close by than ground, the supply plane is most likely to become the return path for that particular signal.
jeyaraman
pcb picture
Look in the threads of Protel99SE forums,
there was a link that points to one application, that would create the necessary image for protel.
jeyaraman
Re: Hardware delay
You could introduce a suitable pi filter. this will introduce a delay.
Caution: Will dissipate some power, so will warm up.
jeyaraman
Re: 120VAC to -48VDC?
Hi,
When converting from one voltage level to another, a PSU is required. In your case, the internal 48Vdc PSU will be one and the external 120Vac to 48Vdc is another.
-48Vdc is very common in telecommunication environment.
When you know current consumption at 48Vdc...
For the I2C bus,
can download the I2C specification from NXP Website
[https://www.nxp.com/acrobat_download/applicationnotes/AN10216_1.pdf]
SPI, is from motorola
IIS is an audio bus, details
[https://www.nxp.com/acrobat_download/various/I2SBUS.pdf]
If you get info on SPORT, post the link...
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