I'm about to embark on a new project that is somewhat different from anything I've done before. I've designed and built plenty of DACs and preamps over the years, but I'm strongly considering purchasing a pair of studio monitors with built in DSP and built in DACs / Amps.
I'm looking at building a digital preamp. Turn the concept of taking a bunch of digital and analogue signals in and controlling the volume and spit out analogue completely on it's head.
In my mind I'm envisioning:
- Analogue input selectors.
- Phono stage preamp *without RIAA correction*
- All going into some ADC chips.
- DSP chip for applying the RIAA correction curve.
- Into a digital receiver chip which will also serve as digital input selector, SRC, and volume control.
So... I've never looked at ADCs before, does anyone have any recommendations on what chips to look at?
Likewise for DSPs.
I'm looking at building a digital preamp. Turn the concept of taking a bunch of digital and analogue signals in and controlling the volume and spit out analogue completely on it's head.
In my mind I'm envisioning:
- Analogue input selectors.
- Phono stage preamp *without RIAA correction*
- All going into some ADC chips.
- DSP chip for applying the RIAA correction curve.
- Into a digital receiver chip which will also serve as digital input selector, SRC, and volume control.
So... I've never looked at ADCs before, does anyone have any recommendations on what chips to look at?
Likewise for DSPs.
Which chips to use may depend on what level of performance is desired. An interesting thread about an instrumentation ADC is at: ADCs and DACs for audio instrumentation applications
You may be forced by part availability these days, lots of parts are difficult to get. In any case the implementation (circuit design and PCB layout quality) can have a bigger impact than which devices you select.
If you want simple easy to use DSP then the Analog Sigma DSP parts are good, like the ADAU1452 and ADAU1462 or 1466. Again stock is an issue.
If you want to build something soon, I would start by looking for parts in stock, instead of focusing on performance or a specific manufacturer. Work with what you can get, and buy the parts you want to use, before the design is complete.
If you want simple easy to use DSP then the Analog Sigma DSP parts are good, like the ADAU1452 and ADAU1462 or 1466. Again stock is an issue.
If you want to build something soon, I would start by looking for parts in stock, instead of focusing on performance or a specific manufacturer. Work with what you can get, and buy the parts you want to use, before the design is complete.
The ADAU1701 comes with built in DAC/ADC and is the most ready to go one I have used so far. Board, programmer, and ready to rock.
The 1452 and the likes in the series have no built in dac and adc as far as I know, and thus require a codec board to provide these in- and outputs (over IIS)
The 1452 and the likes in the series have no built in dac and adc as far as I know, and thus require a codec board to provide these in- and outputs (over IIS)
Thanks for the suggestions so far. I'm not in any rush and the project may not go ahead at all depending on what I do with speakers. Need to move first, then audition the speakers in the room and then will ultimately make my decision to proceed, but knowing how long I take this project should take longer than the global IC shortage.
And yes fully aware about analog design and circuit layout being critical to performance. That won't be an issue. It's not my first mixed signal design.
Thanks for the suggestions so far. 🙂
And yes fully aware about analog design and circuit layout being critical to performance. That won't be an issue. It's not my first mixed signal design.
Thanks for the suggestions so far. 🙂
Just go ahead and make a 1701 based dsp anyway; you will most definitely find a use for it that solves a pain in the *** trick from the past! Jolly good thing cause its so cheap. If you need a FreeUSBi then let me know - I will be ordering some boards and there is a minimum order qty 😛