AW: A Few Simple Questions

[Ullrich Peter]

	>There are several - I have used ZN558 and ZN428.
	>Given that there are inexpensive 12 bit DACs about, you may be just as well
	>to use one of these. Burr Brown make a nice 12 bit DAC that has an 8 bit
	>parallel input and a register select line, so you write the lower 8 bits,
	>then the upper 4 bits. There are several others that work like this.
	>With a look up table in ROM, you can use one of these to give a linear
	>(Hz/v) output.
	>Many of the 12 and 16 bit converters have serial inputs, but there is plenty
	>of documentation on the web showing how to use these.
	>Some DACs are designed more for outputing digital audio than contant
	>voltages tho'.

	I designed a Midi-Interface for the Korg MS-synths a few years ago and used the 
	National Semiconductors DAC1221 12Bit DAC. It worked fine. But I don't know
	if this DAC ist still available.

	Ciao
	Peter

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