6 Replies Latest reply on Feb 14, 2013 8:41 AM by philip.nielsen

MICROWIRETM Compatible

philip.nielsen Feb 14, 2013 8:41 AM

I am trying to use Linear technology 16 Bit DAC. I am a little confused about the description. Is it an I2C communications device or SPI device? When I look at SPI there is reference to MOSI and MOSO.

Some please help me on the emantics.

Thank You,

Philip Nielsen

1. Re: 50MHz SPITM/QSPITM/MICROWIRETM Compatible

philip.nielsen Jan 30, 2013 10:43 AM (in response to philip.nielsen)

I just discovered it is a I2c part. I was hoping it was a true SPI comunication device
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2. Re: 50MHz SPITM/QSPITM/MICROWIRETM Compatible

gautam.das.g Jan 31, 2013 11:06 PM (in response to philip.nielsen)

Hi Philip,



Many of the DACs available in market support both I2C and SPI interface. User needs to configure appropriately to use one of these.

Audio DACs also support I2S interface and in that case PSoC should act as an I2S Master.



Which Linear Technology part are you intending to use?
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3. Re: 50MHz SPITM/QSPITM/MICROWIRETM Compatible

philip.nielsen Feb 13, 2013 8:59 AM (in response to philip.nielsen)

I was going to use LTC2642. It is a 16 bit DAC. WE have allot of 12 bit DACS. But I need more resolution.

Philip
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4. Re: 50MHz SPITM/QSPITM/MICROWIRETM Compatible

user_14586677 Feb 13, 2013 1:18 PM (in response to philip.nielsen)
You can do a 16 bit DAC with a 16 bit PWM, if you can live with

the setlling time/ripple associated with output filter. Attached a

discussion of the filter.



Or use 2 8 bit PWMs -



http://www.edn.com/file/15421-93004di.pdf



Regards, Dana.

TI PWM DAC1.pdf 2.8 MB
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5. Re: 50MHz SPITM/QSPITM/MICROWIRETM Compatible

user_14586677 Feb 13, 2013 1:19 PM (in response to philip.nielsen)
You can do a 16 bit DAC with a 16 bit PWM, if you can live with

the setlling time/ripple associated with output filter. Attached a

discussion of the filter.



Or use 2 8 bit PWMs -



http://www.edn.com/file/15421-93004di.pdf



Regards, Dana.

TI PWM DAC2.pdf 2.8 MB
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6. Re: 50MHz SPITM/QSPITM/MICROWIRETM Compatible

philip.nielsen Feb 14, 2013 8:41 AM (in response to philip.nielsen)

Thank you all for the great suggestions. I really did not want to go I2C. But I did not know about your excelent sugesstions. I will start on your ideas today. Super help.



Thank You,

Philip Nielsen
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