[simpits-tech] 0..5VDC DAC output...

[Roy Coates]

On Fri, 13 Aug 2010, Gene Buckle wrote:


Hmm.. I wunna what the phidget 0/16/16 uses?  That claims to sink up to
2A. Ah, looking at the pic at phidgets.com it would appear they are
driving triacs or similar to do the hard work.

I'm using 4 of the suckers in my current project and they work v.well.



> Ok, after doing a bit of research I found a part from Microchip (MCP4725)
> that is an I2C device with a 12 bit resolution.  It's actually less
> expensive than the 10 bit equivalent to this device.  It's a tiny 6 pin
> surface mount part (SOT-23).
>
> SparkFun sells them on a breakout board for $4.95:
> http://www.sparkfun.com/commerce/product_info.php?products_id=8736
>
> Microchip also offers a 10 bit quad DAC (MCP4728) in a 10 pin MSOP-10
> package.  This part also uses the I2C bus and has three programmable
> address bits (stored in on-board EEPROM) so you can hang a total of 8
> chips on a single I2C bus.  This would allow you to control (potentially)
> 32 DAC channels.
>
> All the devices are rated for a 25mA max per output, but the description
> of the maximum is vague enough ("Current at output pins") that I'm not
> sure if that max is for a single output or all outputs combined.
>
> The most bang for the buck would be the quad DAC at $2.06 each vs $1.06
> for the single channel DAC.
>
> David, what you driving that requires such a tiny current draw?
>
> g.
>
>
>
>
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--

Roy Coates.

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