Re: Cheap 12 bit DAC and ADC's

Winfield Hill wrote:
On Jul 19, 8:57 am, Joerg <inva...@xxxxxxxxxxxxxxx> wrote:
Martin Riddle wrote:
"Joerg" <inva...@xxxxxxxxxxxxxxx> wrote in message
news:7ceoumF27i77oU3@xxxxxxxxxxxxxxxxxxxxx
Martin Riddle wrote:
"John Larkin" <jjSNIPlar...@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in
messagenews:t69465hsv9uugi3nknopg812toq8b9ofe3@xxxxxxxxxx
On Sat, 18 Jul 2009 15:30:31 -0400, "Martin Riddle"
<martin_...@xxxxxxxxxxx> wrote:
I'm looking for a cheap 5v Rail buffered output 12bit DAC
And a 12bit ADC (8 channel).
Any recommendations?
Cheers
For the ADC, maybe an ADS7866 and an HC4051?
John
I should have mentioned SPI, But I think the AD7927 is the one,
half the cost of the LT part we are using now.
That falls under "cheap"? Hmm, you guys leave too much money on the
table :-)
The are some Dacs that are priced right from analog too.
If I had extra port pins then the Mux I would play around with, but
thats not an option.
At that cost I'd consider muxing the SPI stream so you can hang a
register onto the SPI that rotates through the ADC channels. Not an
option for the DACs though.
--
Regards, Joerg
Well I could add like a 74HC595 and feed the mux with that. I think I
have 1 or 2 pare port pins.
Well, there's the solution. All you need is to disassert the device
select for the DACs/ADCs and run another CS line to the 595, then use
the regular (same) SPI lines for clock and data.

Also For the DAC I found a microchip part MCP4922, $3.
But that's only a dual DAC. Plenty of those.

--
Regards, Joerg

http://www.analogconsultants.com/

Do you have a few favorites?


Not really, each circuit situation is just too different and sometimes tricks need to be played with the DACs. I like the AD5328 and the AD7928 for ADC when I have to have lots of channels (if I need more than one channel it's usually lots of them). For a 2ch DAC the DAC7612 is kind of ok at $3, although a long hard search should turn up less expensive ones. Whenever I have a project I go by price and most of all widespread availability. Certain parts are on the black list, but we all know who's those are.

Most of the time my clients already have DACs or ADCs in their designs and prefer that I use the same.

--
Regards, Joerg

http://www.analogconsultants.com/

"gmail" domain blocked because of excessive spam.
Use another domain or send PM.
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