[sdiy] Thanks And Questions about digital control

[Tim Parkhurst]

Another I2C DAC worth looking at might be the DAC8574. They're about $16
each at Digi-Key, but that gets you a quad 16-bit DAC with I2C.
Unfortunately, it's SMT, but it looks like a very powerful part.



Tim (powerful parts) Servo

"Epoxy always has the right 'thread'." - Toby Paddock
********************************************************

> -----Original Message-----
> From: WBerzinskas at nc.rr.com [mailto:WBerzinskas at nc.rr.com]
> Sent: Wednesday, March 09, 2005 3:24 PM
> To: Johannes Öberg
> Cc: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Thanks And Questions about digital control
> 
> I've been looking at I2C and SPI interface DACs..  i've been using the
PICs alot,
> and since it has an interface for both.....   i've got my eye on a 10-bit
spi one
> from maxim i think.. it's got 4 per package and i think i can use a 10v
reference
> with it so that would cut out alot for me.. although it does cost more..
i'll
> have to hceck out the datasheet on the 7528..  thanks for the info!
> 
> 
> ----- Original Message -----
> From: Johannes Öberg <johannes.oberg at gmail.com>
> Date: Wednesday, March 9, 2005 1:48 pm
> Subject: Re: [sdiy] Thanks And Questions about digital control
> 
> > I'm looking at the multiplicating D/A solution. The only reasonably
> > cheap IC I found was the dual 8-bit D/A TLC-7528 from TI. It doesn't
> > cost more than 2 pots even in low quantities.
> >
> > From what I could read out of the data sheet, it would fit our
> > purposes perfectly - it's simple to use, doesn't require alot of
> > external stuff, has a reasonable resolution, and since it's internally
> > latched one wouldn't have to worry to much about the multiplexing. The
> > principle drawing basicly says it is an array of resistors with
> > digitally controlled switches. Have I got this right?
> >
> > If I understand things correctly it will even go to 2.8 MHZ which
> > should be enough for all sorts of things. So perhaps one should stock
> > up on these?
> >
> > However, since it is so much cheaper than the alternatives it sounds
> > "too good"; I'm thinking I should smell some sort of rat...
> >
> 
> 
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