From:
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…
Date: Wed, 09 Mar 2005 18:24:07 -0500
From: WBerzinskas@nc.rr.com
Cc: synth-diy@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!
—-
Date: Wed, 9 Mar 2005 16:02:10 -0800
From: Tim Parkhurst
Cc: synth-diy@dropmix.xs4all.nl
Subject: RE: [sdiy] Thanks And Questions about digital control
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
Date: Wed, 9 Mar 2005 16:48:11 -0800
From: Tim Parkhurst
To: synth-diy@dropmix.xs4all.nl
Subject: RE: [sdiy] Thanks And Questions about digital control
You might also want to check the TLC7628
http://focus.ti.com/lit/ds/slas063a/slas063a.pdf
about the same price (actually a few cents cheaper I think), but the
difference between this one and the 7528 is “The TLC7628C operates from a
10.8V to 15.75V power supply and is TTL compatible over this range.” Sounds
like it would be easier to interface to micros or 74 series TTL.