Unavailability of reference design crstal

[Navdeep]

Hi

I was designing a custom board for nrf52832. The 32MHZ crsytal mentioned in the refrence design of nrf52832 is not available on digi key. So I am ordering the below given part from digikey with same load capacitance -

https://www.digikey.ca/products/en?keywords=887-1998-1-ND

So let me know if it is a good replacement.

The reference design crystal is this:

https://www.digikey.ca/products/en?keywords=Q22FA12800025 

[bjorn-spockeli]

Navdeep The crystal you have suggested has an accuracy of +/- 30ppm, which is within the +/-40ppm requirement for BLE stated in the nRF52832 Product Specification, here is the link to the Infocenter page. The shunt capacitance(C0) of the suggested crystal is 3pF and the ESR is 80Ohms, which also is within the 100Ohm Equivalent series resistance limit with C0 = 3 pF. 

In short, this crystal looks good. 

Bjørn 

[bjorn-spockeli]

AmbystomaLabs You are absolutly correct, I only looked at the standard tolerance @+25degC which was +/-30ppm. It is the total tolerance you need to look at, i.e. Frequency Tolerance (at 25 ℃) + Frequency Stability Over Operating Temperature Range + Aging x Lifetime of the device

In the case of  8Y-32.000MAAV-T this sums up to:

(+/- 30ppm) + (+/-30ppm) + N years x +/- 3ppm = > +/-40ppm

So the crystal you suggested cannot be used with the nRF52832 if you intend on using it for BLE.