Datasheet

954
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181C–SAM-D21_Datasheet–07/2014
36.11.3 Digital Frequency Locked Loop (DFLL48M) Characteristics
Table 36-40. DFLL48M Characteristics - Open Loop Mode
(1)
Note: 1. DFLL48M in Open loop after calibration at room temperature.
Symbol Parameter Conditions Min. Typ. Max. Units
f
OUT
Output frequency
I DFLLVAL.COARSE =
DFLL48M COARSE CAL
DFLLVAL.FINE = 512
47 48 49 MHz
I
DFLL
Power consumption on V
DDANA
I DFLLVAL.COARSE =
DFLL48M COARSE CAL
DFLLVAL.FINE = 512
- 140 - µA
t
STARTUP
Startup time
DFLLVAL.COARSE =
DFLL48M COARSE CAL
DFLLVAL.FINE = 512
f
OUT
within 90% of final value
7 8 9 µs
Table 36-41. DFLL48M Characteristics - Closed Loop Mode
Symbol Parameter Conditions Min. Typ. Max. Units
f
OUT
Average Output frequency fREF = 32 .768kHz 47 48 49 MHz
f
REF
Reference frequency
I
0.732 32.768 33 kHz
Jitter Cycle to Cycle jitter fREF = 32 .768kHz - - 0.42 ns
I
DFLL
Power consumption on V
DDANA
fREF = 32 .768kHz - 425 - µA
t
LOCK
Lock time
fREF = 32 .768kHz
DFLLVAL.COARSE =
DFLL48M COARSE CAL
DFLLVAL.FINE = 512
DFLLCTRL.BPLCKC = 1
DFLLCTRL.QLDIS = 0
DFLLCTRL.CCDIS = 1
DFLLMUL.FSTEP = 10
100 200 500 µs