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ADS7029-Q1: 8 or 12 bit?

Part Number: ADS7029-Q1
I have some questions about the serial interface.


1.
The chapter "8.3.4 Serial Interface" in the data sheet "ads7029-q1.pdf" (Rev. SBAS811 - JANUARY 2017) looks to me like a copy of a 12 ADC.
Is it really the way it is written in the text, or is "Figure 1 and 33: Time diagram" the reference for designing an interface?
I ask because some ADC families have the same length of the result register, regardless of 8/10/12 ... bit-wide ADCs. They fill the missing bits with 0.


2.
Is the number of clocks / bits in the chapters "8.4.1.1 Offset Calibration on Power-Up" and "8.4.1.2 Offset Calibration During Normal Operation" correct?

  • Hello,

    1. Thank you for pointing this out, the text is incorrect when saying the conversion result is 12 bits long. this device has 8 bit resolution, thus after the first 2 initial zeros, the conversion result will be the following 8 bits. This might have been in efforts to address that the frame is only 10 bits long, but it would commonly be used in a frame of 12 to make communications easier. if tis is done the last two bits can be discarded.

    2. the description for calibration are correct in both sections, the clocks needed as described are correct

    Hope this helps to clarify

    Cynthia