Data Sheet

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3.7 Sleep Clock(Optional)
An external crystal is used for generating all radio frequencies and normal operation clocking. As an
alternative, an external frequency reference driven by a temperature-compensated crystal oscillator
(TCXO) signal may be used. No software settings are required to differentiate between the two. In
addition, a low-power oscillator (LPO) is provided for lower power mode timing.
External 32.768KHz Low-Power Oscillator
Symbol Parameter Min Typ Max Units
CLK
Clock frequency range/ accuracy
 CMOS input clock signal type
 ±250 ppm (initial, aging, temperature)
-
32.768
- kHz
PN Phase noise requirement (@ 100KHz) - -125 - dBc/Hz
J
C
Cycle jitter - 1.5 -
ns
(RMS)
SR Slew rate limit (10-90%) -
-
100 ns
DC Duty cycle tolerance 20
-
80
%