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Author Topic: Looking for USB-I2C for DAC & ADC  (Read 1279 times)

lsburden

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Looking for USB-I2C for DAC & ADC
« on: March 07, 2018, 08:08:06 PM »

I'm an Analog Design Engineer and somewhat inexperienced with USB bridges.
I am looking for a USB to I2C bridge for audio converter applications. I'm looking for at least USB 2.0, 24 bit, 48k sample rate - more bit depth and higher sample rates preferred.
How do you determine bit depth and sample rate from typical USB bridge specs?

Searches have turned up the FT201X and the FT90X. Are either of these viable? The FT90X looks like a much higher performing part but maybe something better suited for the more experienced?

Some guidance would be great!

Thank you,
Lucas
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Re: Looking for USB-I2C for DAC & ADC
« Reply #1 on: March 08, 2018, 11:52:20 AM »

Hello,
Are you looking for an I2C master or slave?
Here are our USB to I2C solutions available which are all at least USB 2.0 and support I2C data transfers up to 3.4Mbps.

I2C slave only:
FT200XD
FT201X

I2C master only (using MPSSE engine. LibMPSSE could be used. See AN_177):
FT232H
FT2232H
FT4232H

I2C master only (using HID class driver. LibFT260 could be used.):
FT260

I2C master or slave:
FT4222H (using D2XX drivers and LibFT4222)
FT90x / FT93x (these are indeed MCUs and would require software development to bridge to the USB port. See AN_360 FT9xx Example Applications for more information).

We have Development Modules available for test and evaluation.

Best Regards,
FTDI Community
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lsburden

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Re: Looking for USB-I2C for DAC & ADC
« Reply #2 on: March 12, 2018, 07:49:18 PM »

Sorry I have not responded sooner. I didn't know that there was I2C master and slave.
In the audio converter projects I worked on the distinction was not made. I guess these were purpose built devices so there was no need to point it out.

As I understand - the master controls the clock and initiates the transfer(?). If that is correct than it seems to me that a DAC would require and I2C master and an I2C slave for an ADC. Is that correct?
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Re: Looking for USB-I2C for DAC & ADC
« Reply #3 on: March 13, 2018, 09:55:44 AM »

Hello,

Yes there are I2C masters and slaves. The master always provides the clock and initiates the communication.

You would need to check the specification of the device you are trying to connect to.

It's not necessarily the case that a DAC would require and I2C master and an I2C slave for an ADC.

Best Regards,
FTDI Community
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lsburden

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Re: Looking for USB-I2C for DAC & ADC
« Reply #4 on: March 14, 2018, 08:26:11 PM »

Ok, I think I have it figured out, or at least how to figure out if the converter is a master, slave, or configurable.

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