[sdiy] I2C DAC

Tim Ressel madhun2001 at yahoo.com
Sun Jun 20 00:29:32 CEST 2010


Only two lines? Yeah, that means I2C. I found doing I2C manually to be a pain. If you have an I2C port then go for it. Microchip has cheap I2C DACs as well. MCP4725.

--tr




----- Original Message ----
From: MTG <grant at musictechnologiesgroup.com>
To: Synth-diy at dropmix.xs4all.nl
Sent: Sat, June 19, 2010 2:25:37 PM
Subject: Re: [sdiy] I2C DAC

In only have two pins and I can definitely bit-bang, but there is also hardware support for I2C (though I don'tyet know if I can assign the I2C to the pins I have left). I don't think I can pull off SPI with only two pins. Most chips I've seen need a Chip Select signal.

GB
www.musictechnologiesgroup.com


----- Original Message ----- From: "Tim Ressel" <madhun2001 at yahoo.com>
To: "MTG" <grant at musictechnologiesgroup.com>; <Synth-diy at dropmix.xs4all.nl>
Sent: Saturday, June 19, 2010 2:16 PM
Subject: Re: [sdiy] I2C DAC


> GB,
> 
> Do you need I2C, or are you just bit-banging? Microchip has some inexpensive 12-bit DACs:
> 
> http://ww1.microchip.com/downloads/en/DeviceDoc/22248a.pdf
> 
> Available at Digikey.
> 
> --Tim (pinching pennies 'til Lincoln screams) Ressel
> 
> 
> 
> 
> ----- Original Message ----
> From: MTG <grant at musictechnologiesgroup.com>
> To: Synth-diy at dropmix.xs4all.nl
> Sent: Sat, June 19, 2010 2:09:41 PM
> Subject: [sdiy] I2C DAC
> 
> I'm almost out of pins, but I have two left in a project that I want to hook a DAC up to for control voltages. Anyone recommend a decent I2C single or multi-channel 0 to 5v voltage out DAC?  What are most people using for resolution of control voltages these days? I know 7-bits was the standard for a long time. Is it worthwhile looking at higher resolution for things like filter cutoff or pitch bend or ... ?
> 
> GB
> 
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> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> 
> 
> 

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