Datasheet

681
SAM9261 [DATASHEET]
Atmel-6062O-ATARM-SAM9261-Datasheet_21-Jun-16
38.5.3 Main Oscillator Characteristics
Notes: 1. R
S
= 100 to 200 Ω ; C
SHUNT
= 2.0 to 2.5 pF; C
m
= 2 to 1.5 fF (typ, worst case) using 1 kΩ serial resistor on XOUT.
2. R
S
= 50 to 100 Ω ; C
SHUNT
= 2.0 to 2.5 pF; C
m
= 4 to 3 fF (typ, worst case).
3. R
S
= 25 to 50 Ω ; C
SHUNT
= 2.5 to 3.0 pF; C
m
= 7 to 5 fF (typ, worst case).
4. R
S
= 20 to 50 Ω ; C
SHUNT
= 3.2 to 4.0 pF; C
m
= 10 to 8 fF (typ, worst case).
5. Additional user load capacitance should be subtracted from C
LEXT
.
6. C
LEXT
is determined by taking into account internal parasitic and package load capacitance.
Figure 38-3. Main Oscillator Schematic
Table 38-10. Main Oscillator Characteristics
Symbol Parameter Conditions Min Typ Max Unit
1/(t
CPMAIN
) Crystal Oscillator Frequency 3 16 20 MHz
C
CRYSTAL
Crystal Load Capacitance 12.5 15 17.5 pF
C
LEXT
(6)
External Load Capacitance
C
CRYSTAL
= 12.5 pF
(5)
–15–
pFC
CRYSTAL
= 15 pF
(5)
–18–
C
CRYSTAL
= 17.5 pF
(5)
–22–
Duty Cycle 40 50 60 %
t
START
Startup Time
V
DDPLL
= 3 to 3.6V
C
SHUNT
= 3 pF, 1/(t
CPMAIN
) = 3 MHz
C
SHUNT
= 7 pF, 1/(t
CPMAIN
) = 8 MHz
C
SHUNT
= 7 pF, 1/(t
CPMAIN
) = 16 MHz
C
SHUNT
= 7 pF, 1/(t
CPMAIN
) = 20 MHz
––
20
4
2
2
ms
I
DDST
Standby Current Consumption Standby mode – – 1 µA
P
ON
Drive Level
@ 3 MHz
––
15
µW
@ 8 MHz 30
@ 16 MHz 50
@ 20 MHz 50
I
DD ON
Current Dissipation
@ 3 MHz
(1)
–
150 250
µA
@ 8 MHz
(2)
300 530
@ 16 MHz
(3)
300 530
@ 20 MHz
(4)
450 650
1K
XIN XOUT GND
C
LEXT
C
LEXT
C
CRYSTAL