SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 1407
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SAM3X8E
Manufacturer Part Number
SAM3X8E
Description
Manufacturer
Atmel Corporation
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45.4.6
Table 45-18. 3 to 20 MHz Crystal Oscillator Characteristics
Notes:
Where
11057A–ATARM–17-Feb-12
Symbol
F
F
T
I
I
P
R
C
C
DD_ON
DD_ST
req
req_bypass
ON
ON
f
LEXT
L
C
1. R
2. Rs = 100-200 Ohms; Cs = 2.0 - 2.5 pF; Cm = 2 – 1.5 fF(typ, worst case) using 1 Kohm serial resistor on xout.
3. Rs = 50-100 Ohms; Cs = 2.0 - 2.5 pF; Cm = 4 - 3 fF(typ, worst case).
4. Rs = 25-50 Ohms; Cs = 2.5 - 3.0 pF; Cm = 7 - 5 fF (typ, worst case).
5. Rs = 20-50 Ohms; Cs = 3.2 - 4.0 pF; Cm = 10 - 8 fF(typ, worst case).
PCB
3 to 20 MHz Crystal Oscillator Characteristics
is the capacitance of the printed circuit board (PCB) track layout from the crystal to the SAM3 pin.
S
is the series resistor
Parameter
Operating Frequency
Operating Frequency In Bypass Mode
Supply Ripple Voltage (on VDDPLL)
Duty Cycle
Startup Time
Current consumption
Standby Current Consumption
Drive level
Internal resistor
Maximum external capacitor on XIN and
XOUT
Internal Equivalent Load Capacitance
C
XIN
LEXT
C
LEXT
= 2x(
C
SAM3
Conditions
Normal mode with crystal
External Clock on XIN
Rms value, 10 KHz to 10 MHz
3 MHz, C
8 MHz, C
12 to 16 MHz, C
20 MHz, C
3 MHz
8 MHz
12 to 16 MHz
20 MHz
Standby mode @ 3.6V
3 MHz
8 MHz
12 MHz, 16 MHz, 20 MHz
between XIN and XOUT
Integrated Load Capacitance
(XIN and XOUT in series)
Crystal
C
CRYSTAL
C
L
(2)
(3)
(5)
SHUNT
SHUNT
SHUNT
–
(4)
R = 1K if Crystal Frequency
C
C
XOUT
= 3 pF
= 7 pF
LEXT
L
SHUNT
is lower than 8 MHz
= 7 pF
–
C
PCB
= 7 pF
).
Min
7.5
40
3
Typ
150
150
300
400
9.5
16
50
1
Max
14.5
250
250
450
550
1.4
20
50
30
60
15
30
50
10
12
4
1
5
SAM3X/A
MHz
MHz
Unit
mV
μW
M
ms
μA
nA
pF
pF
%
1407
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