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aout dac chips


soje

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I'm in the planning phase of adding a moog-clone filter to each output of my MBSID (it's got 2 chips). Being annoyed by the price of the dac chip, and having to order several places, I started looking at what was available.

 

Reichelt has this chip in stock:

 

http://www.reichelt.de/ICs-MCP-3-5-/MCP-4922-E-P/3/index.html?&ACTION=3&LA=446&ARTICLE=90090&GROUPID=5472&artnr=MCP+4922-E%2FP&SEARCH=12+bit+converter

 

Advantages:

- relatively cheap

- Scalability (you could start half-populating a board, adding more chips later as needed)

- It's available at Reichelt (meaning you can just order from one place)

- PID package, thru hole soldering instead of SMD

 

Disadvantages:

- Larger footprint

- ?

 

However I'm just a musician and music teacher dabbling in electronics, and I don't know what to look for in the datasheets, to compare it to it's job in the aout module needs. Could a couple of these chips be used instead of the TLV5630?

 

 

Cheers

Søren

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  • 3 weeks later...

Ok, it works. :smile:

 

At least on the breadboard:

mbhp_aout_mcp_prototype.jpg

 

Schematics:

MCP4922 version w/ external VREF: http://www.ucapps.de/mbhp/mbhp_aout_mcp4922.pdf

MCP4822 version w/ internal VREF: http://www.ucapps.de/mbhp/mbhp_aout_mcp4822.pdf

 

This big disadvantage of the chip: it has no serial output, therefore modules can't be chained, but need dedicated chip select lines instead.

J19 provides only 2 CS lines, if more are required, additional IO pins have to be used - but not so many are available...

Therefore it won't be a good choice for projects like MIDIbox CV (or CV2)

But it will be a good choice for people who only need 2 (or maximum 4) channels.

 

Best Regards, Thorsten.

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