can we use all Sigma delta channels with PGA in MKM14Z64

[sudheerbeligere]

MKM14Z64 has 4 Sigma delta (differential), can i use all 4 with PGA using gain of 32. Need to interface 4 differential output sensors and need all with min gain of 32. How much ENOB can be expected from this?

thanks and regards,

Sudheer

[Hui_Ma]

Hi Sudheer,

The core frequency is 75MHz KM34 products provide 4 SD ADC+4 PGA , which Flash size is 256KB.

There without Flash size 128KB KM34 product provide 4 SD ADC+4 PGA. Sorry for that.

The KM34 75MHz product datasheet could be found at here.

Here is related reference manual.

Wish it helps.

Have a great day,
Ma Hui
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

[Hui_Ma]

Hi

MKM14Z64 has 4 Sigma delta ADC, while two with PGA, the other two without PGA.

The KM34 AFE provides 4 Sigma Delta ADC with PGA.

From MKM14Z64 datasheet, the SINAD (Signal-to-Noise + Distortion Ratio) typical value is 78dB.

There with the dynamic range of measurement of ENOB, there with lower 9-bits of result being toggling due to noise.

Wish it helps.

Have a great day,
Ma Hui
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

[sudheerbeligere]

Thanks a lot, looks like many in KM33 are absolete and it says not recommended for new design? is there a reason for doing so?

Also in KM34 series, what is the lowest cost part (at 100K volume) that allows 4 channel PGA+ 24 bit Sigma Delta?

thanks and regards,

Sudheer

[Hui_Ma]

Hi

Customer can order Rev A part. It is same product with the part with some bug fixed. Each part of KM33 product has a corresponding Rev A part. For example, MKM33Z64CLL5 RevA part is MKM33Z64ACLL5.We recommend to use Rev A part for new product design.

You could contact your local NXP Distributor about KM34 product price.

Wish it helps.

Have a great day,
Ma Hui
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

[sudheerbeligere]

Hello Ma Hui,

thanks a lot for your inputs, we could find a part "MKM34Z256VLL7" that has 4 PGA + 4 SD ADC, is this available in 128KB memory option also? Data sheets from the NXP links are confusing, found multiple datasheet for same part bit confusing and the selection guide never mentioned these parts at all. is there a selection guide that can be shared with us for Km34 series?

thanks and regards,

Sudheer