Electronics > Projects, Designs, and Technical Stuff
How to use DAC7821?
rcbuck:
Brian, we cross posted.
I may have to use the TLV5619 and pay more just to confirm my idea works. Thanks for the suggestion.
exmadscientist:
You might also find it helpful to refer to another manufacturer's better-written datasheet to learn how to use the part you prefer. One of the ways ADI makes money is to write better datasheets than the other guy, hoping that seduces you into just using their part... this has certainly worked on me!
In that vein you might take a peek at, say, the AD5445 datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/AD5424_5433_5445.pdf, particularly its section on single-supply operation.
BrianHG:
--- Quote from: rcbuck on August 31, 2020, 02:27:14 am ---Brian, we cross posted.
I may have to use the TLV5619 and pay more just to confirm my idea works. Thanks for the suggestion.
--- End quote ---
It's only $7.53 here:
https://www.rocelec.com/part/TISTLV5619CDW?utm_medium=buyNow&utm_source=findChips
And the interface is dumb, 12 bits and load_dac. Make the vref at 2.5v, or 1/2vcc with 2 divider resistors and a cap and the output will be 0v to VCC.
BrianHG:
--- Quote from: exmadscientist on August 31, 2020, 02:37:14 am ---You might also find it helpful to refer to another manufacturer's better-written datasheet to learn how to use the part you prefer. One of the ways ADI makes money is to write better datasheets than the other guy, hoping that seduces you into just using their part... this has certainly worked on me!
In that vein you might take a peek at, say, the AD5445 datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/AD5424_5433_5445.pdf, particularly its section on single-supply operation.
--- End quote ---
I cant argue here. Analog devices data sheets have always been top notch with every chart and example hookup well documented.
Also cheaper, but you need an IV converter 2 stage opamp for the output with dual supply or rail to rail output opamps:
https://www.rocelec.com/part/ANAAD5445YRU-REEL?utm_medium=buyNow&utm_source=findChips
NiHaoMike:
--- Quote from: rcbuck on August 31, 2020, 02:24:24 am ---I should have mentioned one more thing. It needs to have a 12 bit data bus. My processor instruction time is 72 MHz and I need to do other things between the 16.6667 usec sine wave updates. So I don't have time for serial transmissions or multiple addressing modes.
--- End quote ---
What microcontroller are you using that doesn't have hardware SPI with FIFO and maybe even DMA?
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