Does anybody make a micro with 3 DACs
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From: Joerg on 23 Apr 2010 19:39 Uwe Hercksen wrote: > > > Sjouke Burry schrieb: >> >> connect 3 or more sample/hold amplifiers to one dac. > > Hello, > > this would waste PCB space in comparison with the alternative of using a > quad DAC in a small package. > Unless you use a Cyrpess PSoC as the micro and employ its S/C filter blocks in a somewhat unorthodox manner. I have never done it but in case someone is interested this seems to explain it: http://www.cypress.com/?docID=2644 -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: MooseFET on 23 Apr 2010 20:52 On Apr 23, 7:57 am, John Devereux <j...(a)devereux.me.uk> wrote: > MooseFET <kensm...(a)rahul.net> writes: > > On Apr 23, 3:15 am, John Devereux <j...(a)devereux.me.uk> wrote: > >> MooseFET <kensm...(a)rahul.net> writes: > >> > I have an application where I need 3 DACs controlled by a micro. > > >> > Right now I have a quad DAC chip external to the processor. If > >> > a small processor had 3 or more DACs, it could save me a bit of > >> > space and signal connections. > > >> > 16 bitters preferred but 12 bit may work. > > >> > I can't use PWM stuff because I need frequency response and > >> > low noise at the same time. > > >> Analog Devices ADUC7000 series have 12 bit DACS, up to at least 4 in a > >> chip. > > > Unfortunately, it looks like it is bigger than the micro plus DAC chip > > method but > > it certainly does have the number of DACs. I may still go with it > > because it has enough performance that I may be able to bring other > > functions on board. > > The ADUC7021 is pretty small - 6mm LFCSP. There seems to be a 5mm BGA > package too but that seems like a lot of work. > Unfortunately, unless I misread it, the 7021 only pins out 2 DACs > It has some other useful analog functions too: a good 12 bit 1Msps ADC, > comparator, reference, temp sensor. And a simple PLA! > > -- > > John Devereux
From: krw on 23 Apr 2010 21:14 On Fri, 23 Apr 2010 16:39:58 -0700, Joerg <invalid(a)invalid.invalid> wrote: >Uwe Hercksen wrote: >> >> >> Sjouke Burry schrieb: >>> >>> connect 3 or more sample/hold amplifiers to one dac. >> >> Hello, >> >> this would waste PCB space in comparison with the alternative of using a >> quad DAC in a small package. >> > >Unless you use a Cyrpess PSoC as the micro and employ its S/C filter >blocks in a somewhat unorthodox manner. I have never done it but in case >someone is interested this seems to explain it: > >http://www.cypress.com/?docID=2644 I don't think you'll get an honest 12bits and certainly not 16, out of a PSoC. Cool part, though.
From: John Devereux on 24 Apr 2010 03:27
MooseFET <kensmith(a)rahul.net> writes: > On Apr 23, 7:57 am, John Devereux <j...(a)devereux.me.uk> wrote: >> MooseFET <kensm...(a)rahul.net> writes: >> > On Apr 23, 3:15 am, John Devereux <j...(a)devereux.me.uk> wrote: >> >> MooseFET <kensm...(a)rahul.net> writes: >> >> > I have an application where I need 3 DACs controlled by a micro. >> >> >> > Right now I have a quad DAC chip external to the processor. If >> >> > a small processor had 3 or more DACs, it could save me a bit of >> >> > space and signal connections. >> >> >> > 16 bitters preferred but 12 bit may work. >> >> >> > I can't use PWM stuff because I need frequency response and >> >> > low noise at the same time. >> >> >> Analog Devices ADUC7000 series have 12 bit DACS, up to at least 4 in a >> >> chip. >> >> > Unfortunately, it looks like it is bigger than the micro plus DAC chip >> > method but >> > it certainly does have the number of DACs. I may still go with it >> > because it has enough performance that I may be able to bring other >> > functions on board. >> >> The ADUC7021 is pretty small - 6mm LFCSP. There seems to be a 5mm BGA >> package too but that seems like a lot of work. >> > > > Unfortunately, unless I misread it, the 7021 only pins out 2 DACs Yes, sorry, you're right. Try the 7023 then. Cheaper too, being a "new product", with more pinned-out peripherals. Thanks for making me look! -- John Devereux |