Moved from PM:
Its ok...
i needed some help Gryd3...
I needed to know about some really fast(minimum conversion time) ADC with 8 inputs (either flash type or successive approximation)
also a DAC and a Demux....
Would you please suggest something?
Like any ICs you know of or you might have worked with??
I don't have anything off the top of my head.
How are you looking to interface with these devices? Are you looking to use a serial communication method?
Also, how 'fast' are you looking. I can see what I can find.
Nope...it directly goes to the pi...no interface required....
i mean no serial communication required...sorry
Directly to the Pi how?
The Pi has no analogue IO. Are you planning to use the Digital IOs in parallel to communicate with your peripherals?
There is also I2C, UART, and SPI.
A
direct connection could mean a few things.
The o/p of ADC is digital and around 5v. This goes to the GPIOs of pi....
I dont get why i should use I2C,UART or SPI.....
Well, electrically, the PI needs to communicate to the ADC and DAC somehow.
There are multiple ways of doing so.
Some ADCs will read an analogue value, and toggle the output of anywhere from 4-16 pins as the digital equivalent of what was read. This is inefficient, so communication is usually done with serial data.
Regardless of the method used, the PI will still need to be instructed or configured to tell it how you connected the ADC and DAC.
Telling it 'GPIO' is not good enough, as that is a generic balloon term to cover all of the available pins, and you need to specifically tell it what pins are used.
The link I sent you above shows you what each GPIO pin does.
Do you follow? Or is this still a little fuzzy?
GPIO is not as easy as USB sadly, it's like telling someone to plug a device in the back of the PC without telling them if its USB, Serial, Parallel, PS/2, DVI, VGA, HDMI, etc.
Im going to move this into the thread you started, and will continue there