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

[karl dalen]

Yes i know, but my question was can these 24 bits be used in practice?
CMOS process and all kind of internal switching noise?!

KD

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

> Karl,
> 
> That's true. the ADUC824 has a 24-bit Sigma-Delta ADC on-chip, along 
> with an 8051 core and a 12-bit DAC. Unfortunately, the sample rate of 
> the ADC is only about 20Hz at higher resolutions. Useful for precision 
> instrumentation measurements, but not nearly fast enough for J-P's audio 
> digitizing application.
> 
> Eric
> 
> karl dalen wrote:
> > 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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> >>
> > 
> > 
> > 
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