Re: Cheap 12 bit DAC and ADC's



"Joerg" <invalid@xxxxxxxxxxxxxxx> wrote in message
news:7ceoumF27i77oU3@xxxxxxxxxxxxxxxxxxxxx
Martin Riddle wrote:
"John Larkin" <jjSNIPlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in
message news:t69465hsv9uugi3nknopg812toq8b9ofe3@xxxxxxxxxx
On Sat, 18 Jul 2009 15:30:31 -0400, "Martin Riddle"
<martin_rid@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.

Also For the DAC I found a microchip part MCP4922, $3.

Cheers





.

Relevant Pages

  • Re: Cheap 12 bit DAC and ADCs
    ... For the ADC, maybe an ADS7866 and an HC4051? ... I should have mentioned SPI, But I think the AD7927 is the one, ... 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. ...
    (sci.electronics.design)
  • Re: 16 Channel ADC + 16 RC Servo Motor + 1 RS232 + PIC microcontroller
    ... channel ADC) ... Then only using the top 10 bits for driving the servo! ... If each channel at end of conversion needs to be serviced then you would ... your SPI to send 32 bytes, ...
    (comp.arch.embedded)
  • Re: Cheap 12 bit DAC and ADCs
    ... And a 12bit ADC (8 channel). ... For the ADC, maybe an ADS7866 and an HC4051? ... 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. ...
    (sci.electronics.design)
  • Re: Cheap 12 bit DAC and ADCs
    ... And a 12bit ADC (8 channel). ... For the ADC, maybe an ADS7866 and an HC4051? ... If I had extra port pins then the Mux I would play around with, ... 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. ...
    (sci.electronics.design)
  • Re: Regarding the SPI between ADC and DE2
    ... have been told to use a SPI --- a serial to parallel SPi interface ... SPI") the reality is that you a particular ADC so you need to become ... The way I would approach it is to first model the ADC and validate ... realizing that you're now creating a controller ...
    (comp.lang.vhdl)