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