[sdiy] SOIC audio ADCs & dsPIC33F devices with codec interfaces not shown as such in the selector chart

[Martin Fay]

Hi Robin,

I've regularly seen Wolfson mentioned as supplying components for iPods.

Martin

Sent from my iPhone

On 25 May 2013, at 07:47, Robin Whittle <rw at firstpr.com.au> wrote:

> Hi Eric,
>
> Thanks for the link to your project:
>
>  http://ebrombaugh.studionebula.com/synth/dsPIC_sp/index.html
>
> Here is a correction to what I wrote about the Wolfson ADCs - I wrote
> that the 14 pin device had no advantages over the 8 pin device.
>
>  http://www.wolfsonmicro.com/products/adcs/
>
> The 8 pin device has a poorer distortion figure, but a better signal  
> to
> noise ratio.  They both output 24 bits, but the lowest 8 or so bits of
> this would be noise:
>
>         SOIC pins   SNR dB    THD db
>
>  WM8738        14       90    -87
>  WM8783         8       95    -83
>
> Both have a maximum signal level of 1V RMS, but the 14 pin device  
> needs
> its analogue supply to be 5 volts to accept this.  If it runs at 3.3
> volts, then the maximum signal level would be less.  The 8 pin device
> uses 3.3V for its digital and analogue supply.
>
> I had not heard of Wolfson before.  I never expected to be buying DACs
> or ADCs from a company headquartered in Edinburgh - I always regarded
> this an art more at home in the USA (Burr Brown and Crystal - who I
> think pioneered sigma-delta ADCs and DACs with AKM) and Japan (AKM).
>
> - Robin
>
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