參數(shù)資料
型號(hào): GMS81524BT
廠商: Hynix Semiconductor Inc.
英文描述: [General Purpose(1) : ADC/ LED/ SCI/ PWM]
中文描述: [通用(1):藝術(shù)發(fā)展局/發(fā)光/工商/脈寬調(diào)制]
文件頁(yè)數(shù): 75/110頁(yè)
文件大?。?/td> 1980K
代理商: GMS81524BT
GMS81508B/16B/24B, GMS82512/16/24
72
MAY. 2001 Ver 2.0
19. OSCILLATOR CIRCUIT
The GMS815xxB has two oscillation circuits internally.
X
IN
and X
OUT
are input and output for frequency, respec-
tively, inverting amplifier which can be configured for be-
ing used as an on-chip oscillator, as shown in Figure 19-1.
Figure 19-1 Oscillation Circuit
Oscillation circuit is designed to be used either with a ce-
ramic resonator or crystal oscillator. Since each crystal and
ceramic resonator have their own characteristics, the user
should consult the crystal manufacturer for appropriate
values of external components.
Oscillation circuit is designed to be used either with a ce-
ramic resonator or crystal oscillator. Since each crystal and
ceramic resonator have their own characteristics, the user
should consult the crystal manufacturer for appropriate
values of external components.
In addition, see Figure 19-2 for the layout of the crystal.
Note:
Minimize the wiring length. Do not allow the wiring to
intersect with other signal conductors. Do not allow the wir-
ing 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 it to any ground pattern where high cur-
rent is present. Do not fetch signals from the oscillator.
Figure 19-2 Layout of Oscillator PCB circuit
X
OUT
X
IN
V
SS
Recommend
C1,C2 = 30pF±10pF
C1
C2
X
OUT
X
IN
External Clock
Open
External Oscillator
Crystal or Ceramic Oscillator
8MHz
Crystal Oscillator
X
OUT
X
IN
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