16-bit mode data format issue

Question

Hi 
 
 In the evaluation software of AD4115, we used the 16-bit mode of AD4115 to read the data from the data_register register of the ADC conversion. We captured the waveform at that time. According to the description in the datasheet, it should be an 8-sck command followed by 16-sck data. However, when we captured it, we found that it was 16-sck + 16-sck (as shown in the following figure). This does not match the description in the datasheet. In our application, which configuration should we follow (datasheet or evaluation software)? 
 
 Thanks

JCCillion · Accepted Answer

Hi HJM , 
 
 When operating with a 16-bit data word, a single SPI transaction consists of 8 SCLKs for the DIN command followed by 16 SCLKs for the conversion data, for a total of 24 SCLKs. 
 If the Data+Status option is enabled, an additional 8 SCLKs are required to output the status register. In this case, 32 SCLKs (8 SCLKs command + 16 SCLKs data + 8 SCLKs status). The EVAL+ software prompts to enable the Data+Status when multiple channels are enabled. 
 Furthermore, if CRC checking is enabled, another 8 SCLKs are needed to append the CRC byte. 
 You may refer to Figure 22 of the datasheet. 
 
 Regards, 
 JC)

Popular Forums

Product Forums

Application Forums

Design Center Forums

Highlighted Webinar

Places

Libraries

Upcoming Learning & Events

Challenge Yourself!

What's Brewing

Places

Resources

Visit ContentZone

The Latest Read

New Release

Recent Technical Insights

Forums

Learn

Community Hub

ContentZone

Products Mentioned

Associated Drivers

Thread Details

16-bit mode data format issue

Thread Summary

Before You Switch