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參數資料
| 型號： | HA7210Y |
| 廠商： | INTERSIL CORP |
| 元件分類： | 模擬信號調理 |
| 英文描述： | 10kHz to 10MHz, Low Power Crystal Oscillator |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, UUC8 |
| 封裝： | 0.068 X 0.064 X 0.014 INCH, DIE-8 |
| 文件頁數： | 6/15頁 |
| 文件大小： | 127K |
| 代理商： | HA7210Y |
6
Crystal Pullability
Figure 4 shows the basic equivalent circuit for a crystal and
its loading circuit.
Where:
C
M
= Motional Capacitance
L
M
= Motional Inductance
R
M
= Motional Resistance
C
0
= Shunt Capacitance
If loading capacitance is connected to a Series Mode
Crystal, the new Parallel Mode frequency of resonance may
be calculated with the following equation:
Where:
f
P
= Parallel Mode Resonant Frequency
f
S
= Series Mode Resonant Frequency
In a similar way, the Series Mode resonant frequency may
be calculated from a Parallel Mode crystal and then you may
calculate how much the frequency will “pull” with a new load.
Layout Considerations
Due to the extremely low current (and therefore high
impedance) the circuit board layout of the HA7210 must be
given special attention. Stray capacitance should be
minimized. Keep the oscillator traces on a single layer of the
PCB. Avoid putting a ground plane above or below this layer.
The traces between the crystal, the capacitors, and the OSC
pins should be as short as possible. Completely surround
the oscillator components with a thick trace of V
DD
to
minimize coupling with any digital signals. The final
assembly must be free from contaminants such as solder
flux, moisture, or any other potential source of leakage. A
good solder mask will help keep the traces free of moisture
and contamination over time.
Further Reading
Al Little “HA7210 Low Power Oscillator: Micropower Clock
Oscillator and Op Amps Provide System Shutdown for Battery
Circuits”. Harris Semiconductor Application Note AN9317.
Robert Rood “Improving Start-Up Time at 32kHz for the
HA7210 Low Power Crystal Oscillator”. Harris Semiconductor
Application Note AN9334.
S. S. Eaton “Timekeeping Advances Through COS/MOS
Technology”. Harris Semiconductor Application Note
ICAN-6086.
E. A. Vittoz, et. al. “High-Performance Crystal Oscillator
Circuits: Theory and Application”. IEEE Journal of Solid-
State Circuits, Vol. 23, No. 3, June 1988, pp774-783.
M. A. Unkrich, et. al. “Conditions for Start-Up in Crystal
Oscillators”. IEEE Journal of Solid-State Circuits, Vol. 17,
No. 1, Feb. 1982, pp87-90.
Marvin E. Frerking “Crystal Oscillator Design and
Temperature Compensation”. New York: Van Nostrand-
Reinhold, 1978. Pierce Oscillators Discussed pp56-75.
C
1
C
2
2
OSC IN
3
OSC OUT
V
DD
C
0
C
M
L
M
R
M
FIGURE 4.
C
CL
C
1
------
C
2
------
+
--------------------------
Equivalent Crystal Load
=
=
f
P
f
S
1
C
0
C
CL
)
--------------+
+
=
HA7210
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