Home » Simpit Discussion » simpits-tech » [simpits-tech] 0..5VDC DAC output...
| [simpits-tech] 0..5VDC DAC output... [message #1553] |
Fri, 13 August 2010 13:21  |
 Gene Buckle
Messages: 1071
Registered: January 2009 |
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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_i d=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.
--
Proud owner of F-15C 80-0007
http://www.f15sim.com - The only one of its kind.
http://www.simpits.org/geneb - The Me-109F/X Project
ScarletDME - The red hot Data Management Environment
A Multi-Value database for the masses, not the classes.
http://www.scarletdme.org - Get it _today_!
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| Re: [simpits-tech] 0..5VDC DAC output... [message #1555 is a reply to message #1553 ] |
Fri, 13 August 2010 12:24  |
Roy Coates
Messages: 438
Registered: January 2009 |
Senior Member |
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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_i d=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.
>
>
>
>
> --
> Proud owner of F-15C 80-0007
> http://www.f15sim.com - The only one of its kind.
> http://www.simpits.org/geneb - The Me-109F/X Project
>
> ScarletDME - The red hot Data Management Environment
> A Multi-Value database for the masses, not the classes.
> http://www.scarletdme.org - Get it _today_!
> _______________________________________________
> Simpits-tech mailing list
> Simpits-tech@simpits.org
> http://www.simpits.org/mailman/listinfo/simpits-tech
> To unsubscribe, please see the instructions at the bottom of the above page. Thanks!
>
--
Roy Coates.
------------------------------------------------------------ -------------------
Lord, If I must have an instrument failure, please let it be the Hobbs meter.
------------------------------------------------------------ -------------------
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| Re: [simpits-tech] 0..5VDC DAC output... [message #1562 is a reply to message #1559 ] |
Fri, 13 August 2010 14:13 |
Gene Buckle
Messages: 1071
Registered: January 2009 |
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On Fri, 13 Aug 2010, Roy Coates wrote:
> 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.
>>>
>> I'm still pissed off that they hung the 0/32/32 owners like me out to dry.
>> It'll be a cold day in hell before they get another damn dime from me.
>
> Funnily enough, I was trying to coax mine into life today with an old
> driver - to no avail.
>
I tried that with a Windows 2000 machine under VMware. Just got lots of
nice blue-screens. Pisses me off even more because I found a 4th
*unopened* 0/32/32 package a few weeks ago.
> A lot of phidgets which were uber-cool for 'pitters like the 7-seg
> displays and the rotary encoders went south when they invested in the new
> driver setup.
No kidding. Once I develop the protocol for it, you'll be able to use an
Arduino and a Mux Shield in conjunction with JoyMapper to provide 48
analog and or digital inputs. You'll bit just a bit over $50 for it if
you don't already have an Arduino board. :)
g.
--
Proud owner of F-15C 80-0007
http://www.f15sim.com - The only one of its kind.
http://www.simpits.org/geneb - The Me-109F/X Project
ScarletDME - The red hot Data Management Environment
A Multi-Value database for the masses, not the classes.
http://www.scarletdme.org - Get it _today_!
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| Re: [simpits-tech] 0..5VDC DAC output... [message #1566 is a reply to message #1563 ] |
Fri, 13 August 2010 14:32 |
Gene Buckle
Messages: 1071
Registered: January 2009 |
Senior Member
Administrator |
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On Fri, 13 Aug 2010, Roy Coates wrote:
> On Fri, 13 Aug 2010, Gene Buckle wrote:
>
>> No kidding. Once I develop the protocol for it, you'll be able to use an
>> Arduino and a Mux Shield in conjunction with JoyMapper to provide 48
>> analog and or digital inputs. You'll bit just a bit over $50 for it if
>> you don't already have an Arduino board. :)
>
>
> Anyone got a tissue? ;-)
>
Nope, but you can see the goodie here:
http://www.sparkfun.com/commerce/product_info.php?products_i d=9832
Interestingly enough, the GammaRay 256 uses a pile of those 4067s to
produce it's digital inputs.
g.
--
Proud owner of F-15C 80-0007
http://www.f15sim.com - The only one of its kind.
http://www.simpits.org/geneb - The Me-109F/X Project
ScarletDME - The red hot Data Management Environment
A Multi-Value database for the masses, not the classes.
http://www.scarletdme.org - Get it _today_!
_______________________________________________
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Simpits-tech@simpits.org
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| Re: [simpits-tech] 0..5VDC DAC output... [message #1571 is a reply to message #1569 ] |
Fri, 13 August 2010 22:03 |
Gene Buckle
Messages: 1071
Registered: January 2009 |
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On Fri, 13 Aug 2010, David C. Allen wrote:
> At 02:26 PM 8/13/2010 -0700, you wrote:
>> On Fri, 13 Aug 2010, David C. Allen wrote:
>>
>>> At 01:21 PM 8/13/2010 -0700, you wrote:
>>>> 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).
>>>
>>>
>>> Leo used MCP4922 in the 8 analog output Nitro card. The MCP4922
>>> device is a dual channel 12-bit DAC
>>>
>> Thanks David, I'll look into it. AFAIK, the Arduino software stack can
>> handle SPI as well so this should be a totally trivial interface job.
>
> Trivial for Programming God's but what about us commoners (lowest
> class of people/sim builders)
>
When I next place a part order I'll get some of those in DIP form factor
to play with.
g.
--
Proud owner of F-15C 80-0007
http://www.f15sim.com - The only one of its kind.
http://www.simpits.org/geneb - The Me-109F/X Project
ScarletDME - The red hot Data Management Environment
A Multi-Value database for the masses, not the classes.
http://www.scarletdme.org - Get it _today_!
_______________________________________________
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Simpits-tech@simpits.org
http://www.simpits.org/mailman/listinfo/simpits-tech
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