SAM3S8B Atmel Corporation, SAM3S8B Datasheet - Page 1086

• Manufacturer Part Number: SAM3S8B
• Manufacturer: Atmel Corporation

40.4.6
Table 40-19. 3 to 20 MHz Crystal Oscillator Characteristics
Notes:
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Symbol
F
F
T
I
P
R
C
C
DD_ON
req
req_bypass
ON
ON
f
LEXT
L
1. R
2. Rs = 100-200 Ohms; Cs = 2.0 - 2.5pF; Cm = 2 – 1.5 fF(typ, worst case) using 1 KΩ serial resistor on XOUT.
3. Rs = 50-100 Ohms; Cs = 2.0 - 2.5pF; Cm = 4 - 3 fF(typ, worst case).
4. Rs = 25-50 Ohms; Cs = 2.5 - 3.0pF; Cm = 7 - 5 fF (typ, worst case).
5. Rs = 20-50 Ohms; Cs = 3.2 - 4.0pF; Cm = 10 - 8 fF(typ, worst case).
SAM3S8/SD8
SAM3S8/SD8
3 to 20 MHz Crystal Oscillator Characteristics
S
is the series resistor
Parameter
Operating Frequency
Operating Frequency In Bypass Mode
Supply Ripple Voltage (on VDDPLL)
Duty Cycle
Startup Time
Current consumption
Drive level
Internal resistor
Maximum external capacitor
on XIN and XOUT
Internal Equivalent Load Capacitance
C
Where
the SAM3 pin.
LEXT
= 2x(
C
PCB
C
CRYSTAL
is the capacitance of the printed circuit board (PCB) track layout from the crystal to
–
C
L
–
C
C
XIN
PCB
LEXT
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
3 MHz
8 MHz
12 MHz, 16 MHz, 20 MHz
between XIN and XOUT
Integrated Load Capacitance
(XIN and XOUT in series)
).
(2)
(3)
(5)
SHUNT
SHUNT
SHUNT
C
(4)
SAM3
Crystal
= 3pF
= 7pF
SHUNT
= 7pF
C
L
= 7pF
R=1K if Crystal Frequency
C
XOUT
LEXT
is lower than 8MHz
Min
7.5
40
3
Typ
150
200
250
350
9.5
16
50
1
11090A–ATARM–10-Feb-12
11090A–ATARM–10-Feb-12
Max
14.5
11.5
230
300
350
450
1.4
20
50
30
60
15
30
50
10
4
1
MHz
MHz
Unit
mV
µW
MΩ
ms
µA
pF
pF
%