[sdiy] Thanks And Questions about digital control

[WBerzinskas at nc.rr.com]

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...
>