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I've read MEMS oscillators offer improved performance including phase jitter less than 500fs and frequency stability down to +-0.1ppm. It's difficult to switch from quartz because it simply works and redesign is a bit of a pain, but wondering if anyone has made the switch and what their experience was.

I have a heart rate monitor application circuit. It's powered with a 2.5V coin cell battery and I need an oscillator as my RTC driving my MCU at a 32kHz frequency. I came across a SiTime product SIT1566 with +-5ppm frequency stability, which is key for me. The power consumption is 4.5uA, which is within my power budget. My other option is to use an AVX quartz oscillator that can achieve similar performance. It would be my first time playing with a MEMS oscillator. Any ideas on what would be the best choice from your experience?

Here's the datasheet for SIT1566: http://www.sitime.com/products/32-khz-temperature-compensated-oscillators-tcxo/sit1566

Here's the AVX quartz product datasheet: http://www.mouser.com/ds/2/40/kt3225t_e-838149.pdf

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closed as unclear what you're asking by Bence Kaulics, stanri, Daniel Grillo, Bimpelrekkie, Voltage Spike Jul 5 '16 at 15:55

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    \$\begingroup\$ If you need the performance, you need to do the switch. If you don't need the performance, then the switch is a waste of time. \$\endgroup\$ – PlasmaHH Jul 3 '16 at 20:56
  • \$\begingroup\$ What are you using the frequency for? \$\endgroup\$ – mkeith Jul 3 '16 at 22:12
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    \$\begingroup\$ This is entirely dependent on application, and you have provided no details of your application... \$\endgroup\$ – uint128_t Jul 3 '16 at 22:45
  • \$\begingroup\$ I have a heart rate monitor application circuit. It's powered with a 2.5V coin cell battery and I need an oscillator as my RTC driving my MCU at a 32kHz frequency. I came across a SiTime product SIT1562 with +-5ppm frequency stability, which is key for me. The power consumption is 4.5uA, which is within my power budget. My other option is to use an AVX quartz oscillator that can achieve similar performance. It would be my first time playing with a MEMS oscillator. Any ideas on what would be the best choice from your experience? \$\endgroup\$ – Javier Solorzano Jul 4 '16 at 1:29
  • \$\begingroup\$ @JavierSolorzano please provide the additional context in the question main text (use the edit button). For better reference, please also provide links to the datasheets of the components you are using and considering. \$\endgroup\$ – user2943160 Jul 4 '16 at 2:46
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I've replaced a quartz oscillator module with a MEMS module and it was a straightforward transition. So the technology change should present no problems.

It's hard to see how the accuracy of the quartz oscillator won't be sufficient for the heart monitor, which are measuring a pattern less than 4 Hz. If you have more information to post on this, please do.

Otherwise, the crystal oscillator will be perfectly sufficient.

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  • \$\begingroup\$ I appreciate the feedback. I'm going to work with my MEMS oscillator and see how that goes. Thanks again. \$\endgroup\$ – Javier Solorzano Jul 6 '16 at 17:12
  • \$\begingroup\$ @JavierSolorzano, good luck with it. There was a kit in Farnell with a couple of devices and the programmer, if I remember rightly, you've probably seen that already. \$\endgroup\$ – TonyM Jul 6 '16 at 18:11

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