Jot Down
2012年8月29日 星期三
How to select suitable crystals and external components
In
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/APPLICATION_NOTE/CD00221665.pdf
External capacitors calculation
C
L
:
pF (crystal manufacturer)
C
S
:
pF
C
L1
= C
L2
=
pF
Gain margin calculation
ESR :
Ω (crystal manufacturer)
F :
Hz (crystal manufacturer)
C
O
:
pF (crystal manufacturer)
C
L
:
pF (crystal manufacturer)
g
m
:
mA/V (microcontroller manufacturer)
g
mcrit
=
mA/V
gain
margin
=
crystal will
Calculating drive level
ESR :
Ω (crystal manufacturer)
F :
Hz (crystal manufacturer)
C
L1
:
pF (calculation)
C
S
:
pF
C
probe
:
pF (oscilloscope manufacturer)
V
pp
:
V (measurement)
DL =
uW
Calculating external resistor
F :
Hz (crystal manufacturer)
C
L2
:
pF (calculation)
DL :
uW (measurement)
DL :
uW (crystal manufacturer)
R
EXT
=
 Ω
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