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參數(shù)資料
| 型號： | P83CL882 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 80C51 Ultra Low Power ULP telephony controller |
| 中文描述： | 80C51的超低功耗無鉛汽油電話控制器 |
| 文件頁數(shù)： | 9/88頁 |
| 文件大小： | 328K |
| 代理商： | P83CL882 |
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2001 Jun 19
9
Philips Semiconductors
Product specification
80C51 Ultra Low Power (ULP) telephony controller
P83CL882
6.1.2
R
ESONATOR REQUIREMENTS FOR THE
ACO
In Fig.5a the complete Pierce type oscillator is shown,
while Fig.5b presents the corresponding equivalent circuit
used for calculations.
At the resonance frequency the behaviour of a crystal
resonator can be approximated by its equivalent circuit, as
shown in Fig.5b. The values of the components R
s
, L, C
s
andC
o
inthecrystalequivalentcircuitareusuallyspecified
in the data sheet of the crystal supplier.
The inverting amplifier is replaced by its equivalent circuit,
the current source with the transconductance g
m
and the
output impedance R
g;
as shown in Fig.5b.
With some calculation the condition below can be found,
which estimates a minimal value for g
m
of the inverter
which is required for the oscillation:
Where
and
R
f
is an internal bias resistor, and C
f
stands for all of the
parasitic capacitors parallel to the gate, from input to the
output. Parasitic capacitors from input or output to ground
are included with C
1
or C
2
. The input impedance of a
CMOS gate is high and can be neglected. It is advised to
keep the wiring between chip and resonator as short as
possible.
g
m
4
R
s
ω
o
2
C
p
2
R
f
4
R
g
--1
+
+
×
×
×
≥
C
p
C
o
C
f
C
e
2
------
+
+
=
C
1
C
2
C
e
=
=
handbook, halfpage
MBL311
C2
C1
XTAL2
gm
handbook, halfpage
XTAL1
MBL310
Rs
Rf
Rg
Ig =
gm
×
VI
C2
C1
Cf
VI
XTAL2
L
Cs
Co
a. Crystal oscillator.
b. Crystal oscillator equivalent circuit.
Fig.5 Crystal oscillator and its equivalent circuit.
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