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PICList Thread
'Needed serial 16-bit DAC'
1997\11\10@161510 by Leo Bodnar

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Good day friends,

In my current PIC project I need 14- or 16-bit DAC with good precision
and temperature stability.  The requirements for the chip are these:

- it has to have serial input of some kind (I am not able to dedicate
too many i/o pins from my PIC) and should be directly connected to PIC
pins
- it will be used in continuous output mode (output will not change for
a long period of time or change very slowly)
- I need as high output voltage as possible (I need to control VCO with
varicap)

I would appreciate any input from experts, i.e. you.  I've found some
nice chip specs from Philips (say TDA1543) but they are targeted for
digital audio.  Are they OK to use in zero frequency mode?  How do I
amplify the output (2.5V max) to say 20-30V?  Do I have to care about
something special here?

What chip would you use?

Best regards
Leo Bodnar

1997\11\10@184941 by Steve Smith

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In a message dated 10/11/97  21:41:15, you write:

<<
In my current PIC project I need 14- or 16-bit DAC with good precision
and temperature stability.  The requirements for the chip are these:
 >>
Consider doing the DAC as a PWM and intergrating with an RC filter this will
give you a variable DC output in the 0 to 5v range use an opamp with a gain
of 2 and add a 20v ofset to the opamp try TL071 this will give you a 20 to 30
volt output with as many bits as you dedicate to it in the PIC. an added
advantage is that it only uses one pin on the PIC.  Just takes a little more
software. Many people have done this before it works.

This maybe leads to a challenge to write the most effecient code segment to
to control a 16 bit PWM . Any takers ?

Cheers Steve.....

>What chip would you use?
None just one leg of the PIC !

1997\11\11@041552 by mike

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In message  <spam_OUT34676AC2.CEDTakeThisOuTspamaha.ru> .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU writes:
> Good day friends,
>
> In my current PIC project I need 14- or 16-bit DAC with good precision
> and temperature stability.  The requirements for the chip are these:
>
[ snips ]

I have used Maxim's MAX541 successfully.

Regards,

Mike Watson

1997\11\11@124249 by James Downes

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Hi Leo,
It just so happens that I am working on a small project that requires
a 16 bit DAC with a stable DC output.  A couple that I came across:
DAC714 made by Burr-Brown (http://www.burr-brown.com), MAX541/MAX542 made by
Maxim (http://www.maxim-ic.com).  All are serially programmed.  The BB part
seems to have better specs, but you can get free samples of the Maxim
parts from their web site (a definite plus, although you might run
into some taxes sending it out your way?).  As far as driving a
varactor, the BB part does 0-10V as is (the Maxim requires a
reference if I remember correctly? 5V 10V?) , if you need a greater
range use a good op-amp (see Maxim site :-) with a small gain to
mulitply the output of the DAC (use good (metal) resistors for
thermal stability).  Hope that is some help.
Bye
James.

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