Datasheet

587
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
38.4.2 Main Oscillator Characteristics
Notes: 1. C
S
is the shunt capacitance.
2. R
S
= 100-200 Ω; C
SHUNT
= 2.0 - 2.5 pF; C
M
= 2 – 1.5 fF (typ, worst case) using 1 K ohm serial resistor on xout.
3. R
S
= 50-100 Ω; C
SHUNT
= 2.0 - 2.5 pF; C
M
= 4 - 3 fF (typ, worst case).
4. R
S
= 25-50 Ω; C
SHUNT
= 2.5 - 3.0 pF; C
M
= 7 -5 fF (typ, worst case).
5. R
S
= 20-50 Ω; C
SHUNT
= 3.2 - 4.0 pF; C
M
= 10 - 8 fF (typ, worst case).
6. C
L
and C
LEXT
→
Table 38-9. Main Oscillator Characteristics
Symbol Parameter Conditions Min Typ Max Unit
1/(t
CPMAIN
) Crystal Oscillator Frequency 3 16 20 MHz
C
L1
, C
L2
Internal Load Capacitance (C
L1
= C
L2
)
Integrated Load Capacitance
((XIN or XOUT))
34 40 46 pF
C
L
(6)
Equivalent Load Capacitance
Integrated Load Capacitance
(XIN and XOUT in series)
17 20 23 pF
Duty Cycle 30 50 70 %
t
ST
Startup Time
V
DDPLL
= 1.2 to 2V
C
S
= 3 pF
(1)
1/(t
CPMAIN
) = 3 MHz
C
S
= 7 pF
(1)
1/(t
CPMAIN
) = 16 MHz
C
S
= 7 pF
(1)
1/(t
CPMAIN
) = 20 MHz
14.5
1.4
1
ms
I
DDST
Standby Current Consumption Standby mode 1 µA
P
ON
Drive level
@3 MHz
@8 MHz
@16 MHz
@20 MHz
15
30
50
50
µΩ
I
DD ON
Current dissipation
@3 MHz
(2)
@8 MHz
(3)
@16 MHz
(4)
@20 MHz
(5)
150
150
300
400
250
250
450
550
µA
C
LEXT
(6)
Maximum external capacitor
on XIN and XOUT
10 pF
XIN XOUT
C
LEXT
C
L
C
LEXT
AT91SAM7X