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SPIRIT1 Scheda tecnica(PDF) 25 Page - STMicroelectronics |
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SPIRIT1 Scheda tecnica(HTML) 25 Page - STMicroelectronics |
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25 / 94 page ![]() SPIRIT1 Characteristics Doc ID 022758 Rev 3 25/94 Table 12. Crystal oscillator characteristics Symbol Parameter Test conditions Min. Typ. Max. Unit XTALF Crystal frequency Range 1 Range 2 24 48 26 52 MHz FTOL Frequency tolerance(1) 1. Including initial tolerance, crystal loading, aging, and temperature dependence. The acceptable crystal tolerance depends on RF frequency and channel spacing/bandwidth. ± 40 ppm PNXTAL Minimum requirement on external reference phase noise mask (Fxo=26 MHz), to avoid degradation on synthesizer phase/noise 100 Hz -90 dBc/Hz 1 kHz -120 dBc/Hz 10 kHz -135 dBc/Hz 100 kHz -140 dBc/Hz 1 MHz -140 dBc/Hz TSTART Startup time(2) 2. Startup times are crystal dependent. The crystal oscillator transconductance can be tuned to compensate the variation of crystal oscillator series resistance. VBAT=1.8 V, Fxo= 52 MHz 60 120 220 µs Table 13. Ultra low power RC oscillator Symbol Parameter Test conditions Min. Typ. Max. Unit RCF Calibrated frequency Calibrated RC oscillator frequency is derived from crystal oscillator frequency. Digital clock domain 26 MHz - 34.7 kHz RCTOL Frequency accuracy after calibration ±1 % Table 14. N-Fractional ΣΔ frequency synthesizer characteristics Symbol Parameter Test conditions Min. Typ. Max. Unit FRES Frequency resolution Fxo= 26 MHz high band - 33 Hz PNSYNTH RF carrier phase noise (915 MHz band) 10 kHz -100 -97 -94 dBc/Hz 100 kHz -104 -101 -99 dBc/Hz 200 kHz -105 -102 -100 dBc/Hz 500 kHz -112 -110 -107 dBc/Hz 1 MHz -120 -118 -116 dBc/Hz 2 MHz -123 -121 -119 dBc/Hz TOTIME PLL turn-on/hop time 60 80 µs |
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