Raspberry Pi High-Speed AD/DA

2-channel simultaneous AD/DA conversion with up to 1 MSamp/s

Henning Paul

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Description

This project adds a 2-channel A/D converter and a 2-channel D/A-converter to the Raspberry Pi using the SPI interface, achieving up to 1 MSamp/s conversion rate. This enables the use as a digital scope as well as hooking up a transceiver to turn the RPi into an SDR.

Details

Schematics and layout files will be provided at a later point in time.

Software interfacing through the spidev interface.

GNU Radio integration is planned.

Components

1 × Raspberry Pi B
1 × Analog Devices AD7352 A/D converter
1 × Analog Devices AD5415 D/A converter
1 × 74VHC glue logic
1 × dual and quad OpAmps

View all 6 components

Discussions

James Newton wrote 02/09/2016 at 01:36

See @esot.eric's SDRAM thing project.

Are you sure? yes | no

Eric Hertz wrote 02/09/2016 at 18:34

Woot! Thanks for thinking of my project, James!

Not sure it's quite the same thing, this project looks to be capable of *real-time* D->A (and A->D?), whereas sdramThing is much more about sample/repeat of a lot of data in bursts.

However, you got me thinking... maybe it doesn't need to be limited to AVRs, maybe even an RPi, hmm... Thanks, yo!

Are you sure? yes | no

James Newton wrote 02/09/2016 at 19:42

But they are limited to 1MS/S and have a goal of making a scope. Your sdram thing would make it a two step process: 1. Capture the analog data into the sdram at max speed (like 20-30MHz) then 2. slowly pull it out into the Pi at e.g. 1MHz and display it.

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Raspberry Pi High-Speed AD/DA

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