Electronics > Projects, Designs, and Technical Stuff

FAST A>D conversion

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IDEngineer:
You guys beat me to the post about serial vs. parallel interfacing on high data rate A/D's. I've never had to work with really high data rate converters, but this always seemed to me like the biggest challenge. You're generating 10's or 100's of MB or more, continuously, in real time. That's dedicated discrete hardware at least, or perhaps an FPGA. Then if the data stream is truly continuous you have to dual-port the memory, or multi-bank it, or something. Sounds like a fun challenge but definitely a non-trivial one.

ogden:

--- Quote from: stj on April 04, 2019, 03:06:27 pm ---i want to convert a digital(supposedly) 5v signal into 6bit digital so i can read the logic state in .1v resolution.

--- End quote ---

Logic analyzer which can read logic state as voltage is... every modern oscilloscope. Just saying.

David Hess:
There are lots of cheap TTL compatible parallel output 8 and 10 bit converters which become 6 bits if you ignore 2 or 4 least significant bits.

splin:
The LPC4370 is a 204MHz triple core ARM Cortex processor with an M4 and two M0 cores with an 80MHz 12 bit ADC  - overkill perhaps but they are only $5.5 (10 off). BGA package only unfortunately. Digikey don't even sell 3.5MSPS 12 bit ADCs for that price!

If you only want one you can buy an LPC-Link 2 development board for 18 Euros from Embedded Artists. They used to sell a Labtool board which plugs onto an LPC-Link 2 board to make a 2 channel 60MSPS digital scope and/or 11 channel 100MSPS logic analyzer. The software is a bit limited but the firmware and software are available so you could save yourself a lot of work if you went this route.

You might want to have a look at this thread which uses the 20MSPS 8 bit ADC1175 for < $2:

https://www.eevblog.com/forum/projects/4-channel-adc-10-mhz-8-bit-design/

stj:
this may be a good time to add that i'm trying to keep it small.
i was thinking of just streaming the adc to a latching buffer, then a 5bit binary>decimal convertor and finally an led bargraph, using the 6th bit to change the led colour to indicate 0-2.5 or 2.5-5v

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