[sdiy] Re: Re: [sdiy] Re: Re: [sdiy] presets & patching > co mbining 2 replie s

[Richard Wentk]

At 11:10 16/11/2004 +0100, =?iso-8859-2?Q?Roman?= wrote:
>recently introduced ADS1271 from TI.
>According to marketing bullshit it combines audio converter speed with 
>industrial converter accuracy. Here are some claimed parameters:
>INL 15ppm
>offset error 150uV
>gain error 0.1%
>all temp. drifts about 2uV/C
>SNR 106dB
>sample rate up to 105kHz
>price not known yet
>
>But anyway you could use common audio converters and implement correcttion 
>coefficients in firmware for each gain and offset errors. That's only one 
>'add' and one 'multiply' more per converter. We don't care what is numeric 
>representation of the signal, we only want output matching input.

Good idea. You might have to calibrate offsets by hand, which would take a 
while, but wouldn't take much more of a while than setting up other kinds 
of hardware.

If you're including the crosspoints you have the added advantage that it's 
easy to add summing nodes and virtual VCAs at each point. (Or the points 
that are being used, anyway.)

Richard