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SM8761AAS 데이터시트(PDF) 9 Page - Nippon Precision Circuits Inc

부품명 SM8761AAS
상세설명  Spread Spectrum Clock Generator
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제조업체  NPC [Nippon Precision Circuits Inc]
홈페이지  http://www.npc.co.jp/en
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SM8761 series
NIPPON PRECISION CIRCUITS INC.—9
Typical Connection Circuit
A typical connection circuit diagram is shown in Figure 4.
1) The SM8761 series oscillator circuit between XT and XTN has a built-in feedback resistor (approximately
250k
Ω).
2) The oscillator circuit capacitances C101 and C102 connected to XTN and XT, to match the crystal load
capacitor.
3) If using an external clock input on XT, then connections to XT and XTN should be as shown in figure 3.
4) R201 is impedance matching resistor for board pattern.
5) C201 and C202 are bypass capacitors inserted between the supply voltage lines.
C201 is a 0.1
µF (approximately) multi-layer ceramic capacitor connected directly alongside the SM8761
series.
C202 is a 33
µF (approximately) electrolytic capacitor.
MSEL1 and MSEL0 Connection Method
MSEL1 and MSEL0 both support a 1/2VDD "M" level for 3-value ("H", "M", "L") DC voltage input control.
Typical connection circuits for each input level shown in figure 5. "H" level is input by connection to VDD, and
"L" level by connection to VSS. "M" level is input by connection to the center tap of two identical resistances
in series between VDD and VSS. The recommended resistance is 4.7k
Ω.
Note. This is a sample connection diagram only, and its use is not a guarantee of SM8761 series device characteristics.
Figure 4. Typical connection circuit
(a)“H” level
(b)“M” level
(c)“L” level
Figure 5. MSEL1 and MSEL0 typical connections
XT
XTN
MSEL1
MSEL0
TSTN
VDD
VSS
CLKOUT
VSS
Application Load
VSS
R201
0 to 22
MSEL0
IC1
SM8761
VDD
C202
33
µF
C201
0.1
µF
C102
X'tal
VSS
C101
VSS
MSEL1
VDD
XTN
MSEL1
MSEL0
TSTN
VDD
VSS
R301
4.7k
R302
4.7k
XTN
MSEL1
MSEL0
TSTN
VSS
XTN
MSEL1
MSEL0
TSTN


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