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SM8761AAS 데이터시트(PDF) 9 Page - Nippon Precision Circuits Inc |
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SM8761AAS 데이터시트(HTML) 9 Page - Nippon Precision Circuits Inc |
9 / 11 page 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 Ω 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 Ω R302 4.7k Ω XTN MSEL1 MSEL0 TSTN VSS XTN MSEL1 MSEL0 TSTN |
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