ADS9219: Questions for Register Settings

Hello Kuwahara-san, 

Thank you for bringing these discrepancies to our attention. We have been updating the datasheet during the final release of the additional devices in this family. 

Kei Kuwahara said:

Question for Register "RD_CLK".

Here there seems to be a typo error, the register map references section 7.3.6 Data Averaging, which includes Table 7-4 which goes through the steps necessary to initialize OSR and then to configure the decimation variable. 

In Table 7-4, there is a step where it instructs to write to  "OSR_RD (0xC5[6:5]) " during the initialization process depending on the interface modes. Here OSR_RD == RD_CLK, this was overlooked in one of the updates where the naming convention was changed to OSR_RD to align it with the rest of the OSR related registers. 

Kei Kuwahara said:

Question for Register "INIT_1"

This register was part of the pre-release initiation sequence for these devices, but in latest release of devices in this family the initialization sequence was updated and mostly removed. However, for the 5MSPS version of these devices (ADS92x7) this register will still need to be configured according to Table 7-7 in the datasheet. 

For the ADS92x9 and ADS92x8 devices (10MSPS & 20MSPS) it should always be left in default configuration (0x0000). 

This is why it has the naming remains this way and it is still part of the device configuration requirements. 

For the ADS9219 please proceed with INIT_1 = 0x0000 or disregard writing to it at all. If using ADS9217 please look at Table 7-7 for correct configuration. 

Best regards, 

Yolanda

Hello Yolanda-san,

Thank you for the detailed answer!

Customer has both PASD9219 and ADS9219 in their hands.
I believe the datasheet Rev.B is for PADS9219 and Rev.C for ADS9219. correct?

Should they have different register settings for PADS9219 and ADS9219?

Best Regards,
Kei Kuwahara

Great question Kuwahara-san

thank you for letting me know they also have the PADS9219 version as well

For the PADS9219 and any of the pre RTM version of the devices we had a separate initialization sequence  where that INIT_1 register was set to the 0x000B, configured, then the register would be set back to 0x0. 

These are the steps that should be taken for a PADS9219

Please follow the ones on the current datasheet for the ADS9219 version

If needed, we can also trace back the specific lot the devices came from and confirm further, in cases the customer has any issues. 

Best regards, 

Yolanda

Hello Yolanda-san,

Thank you for the answer.

Customer would like to know, if there are ways to distinguish Pre RTM version device via reading back the register bits.

Is there any difference in some reserved bits between Pre-RTM and RTMed devices?

Best Regards,
Kei Kuwahara