How to interface Arduino to a 12-bit serial DAC
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From: kasterborus on 27 Oct 2007 17:14 Can anyone give me some pointers on what I would need to do to get a TLV5618 12bit serial DAC running with an Arduino? I want to be able to output 0-5v under program control. http://focus.ti.com/lit/ds/symlink/tlv5618a.pdf Particularly how I connect CS, SCLK, and REF to get the chip working. Thanks,
From: Tom2000 on 27 Oct 2007 18:45 On Sat, 27 Oct 2007 21:14:21 -0000, kasterborus(a)yahoo.com wrote: >Can anyone give me some pointers on what I would need to do to get a >TLV5618 12bit serial DAC running with an Arduino? > >I want to be able to output 0-5v under program control. > >http://focus.ti.com/lit/ds/symlink/tlv5618a.pdf > >Particularly how I connect CS, SCLK, and REF to get the chip working. > >Thanks, After a quick peek at the data sheet, it looks like the shiftout command will do the job. You'll have to handle the CS lead yourself. Just assign it to any convenient output pin, drop it, shift your data to the DAC, then raise CS again. The Arduino help pages explain the use of the shiftout routine. Good luck! Tom
From: kasterborus on 27 Oct 2007 18:54 Tom, Thanks so much, that helps a lot - can I tie Vin and REF to +5v? Or does REF need to be different? Dave
From: Tom2000 on 28 Oct 2007 01:50 On Sat, 27 Oct 2007 22:54:00 -0000, kasterborus(a)yahoo.com wrote: >Tom, > >Thanks so much, that helps a lot - can I tie Vin and REF to +5v? Or >does REF need to be different? > >Dave You sure can, Dave. And, like the AVdd input to your Arduino, make sure that the REF pin is well bypassed. Any noise on this pin will appear on your analog output. Have fun! Tom
From: kasterborus on 28 Oct 2007 10:13
On Oct 28, 1:50 am, Tom2000 <ab...(a)earthlink.net> wrote: > On Sat, 27 Oct 2007 22:54:00 -0000, kasterbo...(a)yahoo.com wrote: > >Tom, > > >Thanks so much, that helps a lot - can I tie Vin and REF to +5v? Or Bypass? Hmmm... <newb> This is a capacitor between the pin and ground, right? What's a typical value for this cap? </newb> Dave > >does REF need to be different? > > >Dave > > You sure can, Dave. > > And, like the AVdd input to your Arduino, make sure that the REF pin > is well bypassed. Any noise on this pin will appear on your analog > output. > > Have fun! > > Tom |