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AT89C51AC3-SLSUM 其他数据使用手册 - ATMEL（爱特美尔）
制造商:
ATMEL（爱特美尔）
分类:
微控制器
封装:
PLCC-44
描述:
AT89C51 系列 60 MHz 64 KB 闪存 2.25 KB SRAM 8 位 微控制器 - PLCC-44
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AT89C51AC3-SLSUM数据手册
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5
4363A–80C51–07/04
The impedance phase is related to the frequency and each elements of the model plays
a role in specific frequency ranges. The main electrical characteristics of these elements
are summarized hereafter.
Table 2 gives some typical crystal characteristics.
Note: 1. Fundamental Mode
2. Third Overtone Mode
“Series” Versus
“Parallel” Crystal
There is no such thing as a “series cut” crystal as opposed to a “parallel cut” crystal.
Both modes exist in a crystal. Only the oscillator structures (Pierce, Colpitts, ..) will oscil-
late the crystal close to the fs or between fs and fa resonance frequencies. The first
structure is called a series resonant oscillator and the second a parallel resonant
oscillator. It should be noted that no oscillator structure is able to oscillate at the exact
fa frequency. This is due to the high quality factor at fa and the difficulty to stabilize an
oscillator at this frequency.
Table 2. Examples of Crystal Characteristics
Frequency
MHz
R1
ohms
L1
mH
C1
fF
C0
pF
fs
MHz
fp
MHz
Qs Qp
32 35 11.25 2.2 7 32 32.005 646k 3.11
30
(2)
20 11 2.6 6 30 30.0065 102k 6.14
30
(1)
40 33.94 0.83 3.8 30 30.00328 160k 3.48
20 50 20 3.2 10 20 20.0032 497k 2.98
16 80 11.641 8.5 3 16 16.022 146k 3.42
10 20 0.025 10 20 10 10.00025 159.2k 80
8 7 0.0862 4.6 40 8 8.00026 618k 17.4
6 8 0.0848 8.3 40 6 6.000356 533k 37
2 100 520 12 4 2 2.003 66K 198
fs
1
6.28 C1 L1
⋅⋅
:=
Series resonance
frequency
Quality factor
Qs
L1 6.28
⋅
fs
⋅
R1
:=
Parallel resonance
frequency
Quality factor
ESR
Qp
1
C0 6.28
⋅
fp
⋅
R1
⋅
:=
fa fs 1
C1
C0
+⋅:=
ESR R1 1
C0
CL
+
2
⋅:=
fp fs 1
C1
2C0 CL
+
()
⋅
+
⋅:=
Qp
1
CL 6.28
⋅
fp
⋅
ESR
⋅
:=
With External Load, CL
frequency
Quality factor
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