One of the wearable designs using the TRF7970 has space constraints and we're aggressively eliminating passives where possible. Our next target: 3 passives used for clocking the 13.56 MHz Xtal pins (XTAL +2 caps). We would like to replace the bulky crystal and load caps with a micro-power 1.5 mmx 0.8 mm oscillator of the same frequency.
What should be the frequency stability and phase noise of the external 13.56 MHz external clock?
Thanks,
JP