AD1939 TDM mode and compatibility with MCHStreamer

Hello thaines3,

thaines3 said:

In the datasheet for the AD1939 on page 16, figure 12 and 13 say in parenthesis (8-Channel I2S Mode).

(Link to AD1939 datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/AD1939.pdf )

Is this a misprint since the figure is supposed to say "I2S Mode" since the figure is supposed to be showing a TDM stream?

This is a diagram about the AUX mode. This is where you can bring in four more AUX DAC channels. They would come in on two I2S lines and be inserted into the TDM data to drive other external DACs. There are a few strange and confusing modes on this part. 

You would not be using the AUX mode. Also note that the diagram is showing TDM16 which is what you will need to use for this AUX mode. 

The only useful modes is the daisy chain mode to allow you to combine the data for four ADC from two different chips into one TDM8 data line. 

Yes, the TDM 8 mode can be setup to be compatible with the streamer. 

Dave T

Hello thaines3,

thaines3 said:

In the datasheet for the AD1939 on page 16, figure 12 and 13 say in parenthesis (8-Channel I2S Mode).

(Link to AD1939 datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/AD1939.pdf )

Is this a misprint since the figure is supposed to say "I2S Mode" since the figure is supposed to be showing a TDM stream?

This is a diagram about the AUX mode. This is where you can bring in four more AUX DAC channels. They would come in on two I2S lines and be inserted into the TDM data to drive other external DACs. There are a few strange and confusing modes on this part. 

You would not be using the AUX mode. Also note that the diagram is showing TDM16 which is what you will need to use for this AUX mode. 

The only useful modes is the daisy chain mode to allow you to combine the data for four ADC from two different chips into one TDM8 data line. 

Yes, the TDM 8 mode can be setup to be compatible with the streamer. 

Dave T