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From: John Devereux on 23 Apr 2010 06:15
MooseFET <kensmith(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.

--

John Devereux
From: MooseFET on 23 Apr 2010 09:52
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.

Thanks
>
> --
>
> John Devereux

From: John Devereux on 23 Apr 2010 10:57
MooseFET <kensmith(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.

It has some other useful analog functions too: a good 12 bit 1Msps ADC,
comparator, reference, temp sensor. And a simple PLA!

--

John Devereux
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