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ADS7953 Converted data is shifted behind by two frames

Lingaraja Marimuthu
Prodigy 20 points
Other Parts Discussed in Thread: ADS7953

Hi,

During ADS7953 analog to Digital conversion , the converted channel output is delivered by two frames behind rather in the next frame.

The chosen mode is manual mode and SPI configuration. The channels are read from 0 to 16 in the ascending order. According to the data sheet given, the Output of channel which is configured in the current frame will be clocked out in the next frame.

But in my case , the channel which is configured in the 1st frame is clocked out from 3rd frame. , the channel which is configured in the 2nd frame is clocked out from 4th frame and and so on.

Please can anyone help?

For the reference ,the timing diagram is .shown below.



Regards

  • 0
    TI__Guru**** 180941 points

    Hi Lingaraja,

    This is the normal behavior of the device.  The ADS7953 changes mux channels with the second falling SCLK edge (see page 23, figure 45).  In your first frame, you enter manual mode and set the address to CH0.  In the second frame, second falling SCLK edge, you actually switch to CH0.  CH0 is then acquired in the end of frame 2 and the conversion results are provided in frame 3.  Frame 2 is where you changed to CH1, which is muxed in and sampled on frame 3 with the conversion results in frame 4 and so on.