SV: Re: [sdiy] Good 16 bits A/D choice for mono audio recording

[karl dalen]

Ad has the Aduc series of MCU's some have 24bit sigma-
delta AD but can these 24 bits in practice be realized? 

KD

--- Eric Brombaugh <ebrombaugh at earthlink.net> skrev:

> J-P,
> 
> There are lots of decent SPI ADCs out there that would work just fine 
> for 44kHz, 16-bit sampling. Linear Tech, ADI and TI make a wide variety 
> of them. 16-bit parts are a bit harder to find than 12-bit parts though.
> 
> The on-chip 12-bit ADCs in the PIC series parts will typically exhibit 
> rather poor INL (Integral Nonlinearity) which reduces the ENOB 
> (effective number of bits). They also tend to be pretty sensitive to 
> noise in the VDD & Vref lines. This means that the 12-bit ADC will have 
> an SNR that's closer to that of a 10-bit converter. If you can live with 
> 60dB of SNR in your audio then you're probably OK. Otherwise you'd be 
> wise to choose a converter that can guarantee better quantization noise.
> 
> Eric
> 
> jean-pierre.desrochers at ville.quebec.qc.ca wrote:
> > It's good to see someone is still
> > there to help...
> > I'm looking for SPI for less pin count
> > on the PIC cpu that will do the readings.
> > I saw PIC18's with 12bits A/D but I fear some
> > A/D noise from it since this is audio I read.
> > If I go 12bits would the PIC18 be a good choice anyway?
> > I think external 16bits A/D would do better..?
> > J-P Desrochers
> > 
> > -----Message d'origine-----
> > De : Eric Brombaugh [mailto:ebrombaugh at earthlink.net]
> > Envoyé : 25 mai 2007 11:33
> > À : synth-diy at dropmix.xs4all.nl
> > Objet : Re: [sdiy] Good 16 bits A/D choice for mono audio recording
> > 
> > 
> > jean-pierre.desrochers at ville.quebec.qc.ca wrote:
> > 
> >> I need to pick a good A/D converter for sampling
> >> the surrounding audio. I found the Analog Devices AD7684.
> >> It shows a suitable S/N ratio and is single supply
> >> like I need.
> > 
> > What sort of interface are you looking for?
> > 
> > * Parallel
> > * SPI
> > * I2S
> > * other?
> > 
> > Eric
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> 
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