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From: [e-mail] (Brian Clark)
Subject: Re: High Resolution ADC for Mac II
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Date: Fri, 16 Apr 1993 23:30:32 GMT
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In article <[e-mail]>, Rob Douglas
<[e-mail]> wrote:
> 
> In article <1qhfmg$[e-mail]> Charles E. Cunningham,
> cec@imager writes:
> >   I would like to buy a 16 bit ADC card for the Mac II with digitization
> >rate of at least 100 kHz, preferably 200 kHz.  I would prefer one with 
> >good differential and integral linearity, and DMA would be a plus.  Other
> >than National Instruments, do you know of any other vendor who sells such
> >a card?
> 
> Instrutech Corp has a nice looking 16 bit A/D and D/A board that can run
> at the speeds you want. The ITC-16 (?) doesn't have DMA, but it does have
> a good sized FIFO that can buffer your samples. Instrutech can be reached
> at [phone], or 929-0934 (FAX).
> 

I don't know about the Instrutech boards (though I plan to check them out),
but you need to be very careful checking the monotonicity and S/N ratio of
many of the "16 bit" boards out there. The NI boards are very clearly
specified in terms of monotonicity, S/N ratio, accuracy, etc; and the
NB-A2100 and NB-A2150 have all the dyynamic range and freedom from
distortion that you'd expect from a good, true 16 bit converter. This is
not true for the Spectral Innovations boards, for example.