nNF52832 HF xtal

[Tosa]

Per table 19.4.2 in the nRF52 PS v 1.1: , what is the difference between CL (load cap) and C0 (shunt cap)? The max ESR is specified for C0 but not CL. The xtal datasheets specify CL. So how can I be sure that the ESR of the chosen xtal meets the datasheet requirements?

Will these xtals work?

ECS ECS-320-8-47-JTN-TR

Pericom US3200005Z

AVX/Kyocera CX2016DB32000D0WZRC1

ECS ECS-320-8-36CKM-TR

What is the physically smallest xtal that will work?

[Einar Thorsrud]

Both the load capacitance (CL) and shunt capacitance (C0) are specified in the datasheets of the crystals. The C0 is the capacitance between the electrodes that connect the quartz crystal to the package. The CL is the external circuit capacitance in parallel with the crystal. This page has a good overview of how crystals are specified.

You should compare the crystals you are considering with the requirements in the nRF52 crystal oscillator spec, and as long as it matches the requirements, it should be OK. From what I can see the crystals you have listed should be OK.

[Tosa]

You are correct; the datasheets do specify C0. Unfortunately it seems that ECS-320-8-47-JTN-TR does not meet the spec since it has ESR=100ohm and C0=5pF. However, the US3200005Z seems to meet spec. These both come in a small 1.6mm x 1.2mm package; the other two are bigger.