DAC with more than 5V

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stevepotter
 
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DAC with more than 5V

Post by stevepotter »

I'm looking to control a lighting system that is 0-10v. The light needs to be dim so I thought I could get away with < 5V. The DAC works great but it turns out I need more than 5V. If I hooked it up to 12V, would it fry? The specs say no more than 5.5V but has anyone tried more? If I can't increase my input voltage, does anyone know of an easy way for me to double the signal's voltage?

Thanks

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adafruit_support_mike
 
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Re: DAC with more than 5V

Post by adafruit_support_mike »

Which DAC are you using?

stevepotter
 
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Re: DAC with more than 5V

Post by stevepotter »

MCP4725 Breakout Board - 12-Bit DAC w/I2C Interface
http://www.adafruit.com/products/935
Data sheet: http://www.adafruit.com/datasheets/mcp4725.pdf

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adafruit_support_mike
 
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Re: DAC with more than 5V

Post by adafruit_support_mike »

Yeah, that chip will die at 12v.

According to the Absolute Maximum Ratings at the top of page 3, the highest you can go before you assume the chip has been damaged is 6.5v .

As far as doubling the voltage goes, there are ways to do it, but the exact solution that will be best for you depends on the details of your application. How much current do you need from the 0v-10v signal?

stevepotter
 
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Re: DAC with more than 5V

Post by stevepotter »

Hey,
I was able to put something together. I wanted 0-10v, but actually for my application (dimming a light) I really just needed 5-10v. So, I put a 5v power supply in serial with the 0-5v DAC and could digitally control 5-10v. Nice and simple. Thanks for replying.

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adafruit_support_mike
 
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Re: DAC with more than 5V

Post by adafruit_support_mike »

Glad you got it working.

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