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| 型號(hào)： | HMS81C43XX |
| 廠商： | Hynix Semiconductor Inc. |
| 英文描述： | CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR TELEVISION |
| 中文描述： | CMOS單芯片8位單片機(jī)電視 |
| 文件頁數(shù)： | 81/100頁 |
| 文件大?。?/td> | 1943K |
| 代理商： | HMS81C43XX |
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HMS81C43xx / GMS87C4060
81
November 2001 ver 1.2
21. OSCILLATOR CIRCUIT
The HMS81C43xx/GMS87C4060 has two oscillation cir-
cuits internally. X
IN
and X
OUT
are input and output for
main frequency and OSC1 and OSC2 are input and output
for OSD(On Screen display) frequency, respectively, of a
inverting amplifier which can be configured for use as an
on-chip oscillator, as shown in Figure 21-1 .
Figure 21-1 Oscillation Circuit
Oscillation components have their own characteristics, so
user should consult the component manufacturers for ap-
propriate values of external components.
In addition, see Figure 21-2 for the layout of the crystal.
Note:
Minimize the wiring length. Do not allow wiring to in-
tersect with other signal conductors. Do not allow wiring to
come near changing high current. Set the potential of the
grounding position of the oscillator capacitor to that of V
SS
.
Do not ground to any ground pattern where high current is
present. Do not fetch signals from the oscillator.
Figure 21-2 Layout example of Oscillator PCB circuit
X
OUT
X
IN
V
SS
Recommend
C1
C2
X
OUT
X
IN
External Clock
Open
External Oscillator
LC Oscillator
Crystal Oscillator
fc (MHz)
you have to tune the
frequency to appropriate
range which is dependent
to your target set.
For selection L,C value,
OSC2
OSC1
V
SS
C1
C2
L1
fc (MHz)
4
6
8
C1 & C2 (pF)
30
5
Recommend
fc (MHz)
8
12
16
C1 & C2 (pF)
L (uH)
20
5
20
10
5
100
15
15
15
X
OUT
X
IN
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HMS81C4460 | 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS |
| HMS81C4X60 | 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS |
| HMS81C5216 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:REMOTE CONTROLLER |
| HMS87C1102 | 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:8-BIT SINGLE-CHIP MICROCONTROLLERS |
| HMS87C1102A | 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:8-BIT SINGLE-CHIP MICROCONTROLLERS |
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