SAM L21

47.8.6 Digital Frequency Locked Loop (DFLL48M) Characteristics - 105°C

Table 47-39. DFLL48M Characteristics - Open Loop Mode^(1,2)
Symbol	Parameter	Conditions	Min.	Typ.	Max.	Units
F_OpenOUT	Output frequency	DFLLVAL.COARSE=DFLL48M_COARSE_CAL DFLLVAL.FINE=512	46.6	47.8	49	MHz
T_OpenSTARTUP	Startup time	DFLLVAL.COARSE=DFLL48M_COARSE_CAL DFLLVAL.FINE=512 F_OUT within 90% of final value	-	8.3	9.1	µs

Note:

DFLL48 in open loop can be used only with LDO regulator.
These values are based on characterization.

Table 47-40. DFLL48M Characteristics - Closed Loop Mode
Symbol	Parameter	Conditions	Min.	Typ.	Max.	Units
F_CloseOUT	Average Output frequency	f_REF = XTAL, 32.768kHz, 100ppm DFLLMUL=1464	47.963	47.972	47.981	MHz
F_REF^(2,3)	Input reference frequency		732	32768	33000	Hz
F_CloseJitter⁽¹⁾	Period Jitter	f_REF = XTAL, 32.768kHz, 100ppm DFLLMUL=1464	-	-	0.51	ns
T_Lock⁽¹⁾	Lock time	F_REF = XTAL, 32.768kHz, 100ppm DFLLMUL=1464 DFLLVAL.COARSE=DFLL48M_COARSE_CAL DFLLVAL.FINE = 512 DFLLCTRL.BPLCKC = 1 DFLLCTRL.QLDIS = 0 DFLLCTRL.CCDIS = 1 DFLLMUL.FSTEP = 10		200	700	µs

Note:

These values are based on characterization.
To insure that the device stays within the maximum allowed clock frequency, any reference clock for the DFLL in close loop must be within a 2% error accuracy.
These values are based on simulation. They are not covered by production test limits or characterization.

Table 47-41. DFLL48M Power Consumption⁽¹⁾
Symbol	Parameter	Conditions	Ta	Min.	Typ.	Max.	Units
I_DD	Power consumption Open Loop	DFLLVAL.COARSE=DFLL48M_COARSE_CAL	Max.105°C Typ.25°C	-	286	-	µA
I_DD	Power consumption Closed Loop	F_REF = 32.768kHz, V_CC=3.3V	Max.105°C Typ.25°C	-	362	-	µA

Note:

These values are based on characterization.

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