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📄 dtmf信号发送-接收电路芯片mt8880-电子电路图,电子技术资料网站.mht

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                <TD=20
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PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; =
PADDING-BOTTOM: 0cm; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: =
47.35pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; =
mso-border-top-alt: solid windowtext .5pt"=20
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                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
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12pt">b 0<O:P>=20
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                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; =
PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 131.15pt; =
PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; =
mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid =
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                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
                  align=3Dcenter><SPAN lang=3DEN-US=20
                  style=3D"FONT-SIZE: =
12pt">BURST=CB=AB=D2=F4=C8=BA=C4=A3=CA=BD<O:P> </O:P></SPAN></P></TD>
                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; =
PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 152.95pt; =
PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; =
mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid =
windowtext .5pt"=20
                vAlign=3Dtop width=3D204>
                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
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12pt">=C2=DF=BC=AD=A1=B0<SPAN=20
                  =
lang=3DEN-US>0=A1=B1=CA=B9=C4=DC=CB=AB=D2=F4=C8=BA=C4=A3=CA=BD<O:P> =
</O:P></SPAN></SPAN></P></TD></TR>
              <TR>
                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; =
PADDING-BOTTOM: 0cm; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: =
47.35pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; =
mso-border-top-alt: solid windowtext .5pt"=20
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                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
                  align=3Dcenter><SPAN lang=3DEN-US style=3D"FONT-SIZE: =
12pt">b1<O:P>=20
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                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; =
PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 131.15pt; =
PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; =
mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid =
windowtext .5pt"=20
                vAlign=3Dtop width=3D175>
                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
                  align=3Dcenter><SPAN lang=3DEN-US=20
                  style=3D"FONT-SIZE: =
12pt">TEST=CA=B5=D1=E9=C4=A3=CA=BD<O:P> </O:P></SPAN></P></TD>
                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; =
PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 152.95pt; =
PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; =
mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid =
windowtext .5pt"=20
                vAlign=3Dtop width=3D204>
                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
                  align=3Dcenter><SPAN style=3D"FONT-SIZE: =
12pt">=C2=DF=BC=AD=A1=B0<SPAN=20
                  =
lang=3DEN-US>1=A1=B1=CA=B9=C4=DC=CA=B5=D1=E9=C4=A3=CA=BD=A1=A3=B8=C3=C4=A3=
=CA=BD=CA=B1=A3=ACIRQ/CP=D2=FD=BD=C5=CA=E4=B3=F6=D1=D3=B3=D9=BF=D8=D6=C6=D0=
=C5=BA=C5=A3=A8CRA b1=3D0=A3=A9<O:P>=20
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              <TR>
                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; =
PADDING-BOTTOM: 0cm; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: =
47.35pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; =
mso-border-top-alt: solid windowtext .5pt"=20
                vAlign=3Dtop width=3D63>
                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
                  align=3Dcenter><SPAN lang=3DEN-US style=3D"FONT-SIZE: =
12pt">b2<O:P>=20
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                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; =
PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 131.15pt; =
PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; =
mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid =
windowtext .5pt"=20
                vAlign=3Dtop width=3D175>
                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
                  align=3Dcenter><SPAN lang=3DEN-US=20
                  style=3D"FONT-SIZE: =
12pt">S/D=B5=A5=CB=AB=D2=F4=B2=FA=C9=FA<O:P> </O:P></SPAN></P></TD>
                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; =
PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 152.95pt; =
PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; =
mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid =
windowtext .5pt"=20
                vAlign=3Dtop width=3D204>
                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
                  align=3Dcenter><SPAN style=3D"FONT-SIZE: =
12pt">=C2=DF=BC=AD=A1=B0<SPAN=20
                  =
lang=3DEN-US>0=A1=B1=D4=CA=D0=ED=B2=FA=C9=FADTMF=A3=AC=B7=F1=D4=F2=A3=AC=CA=
=E4=B3=F6=B5=A5=D2=F4=C6=B5<O:P>=20
              </O:P></SPAN></SPAN></P></TD></TR>
              <TR>
                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; =
PADDING-BOTTOM: 0cm; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: =
47.35pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; =
mso-border-top-alt: solid windowtext .5pt"=20
                vAlign=3Dtop width=3D63>
                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
                  align=3Dcenter><SPAN lang=3DEN-US style=3D"FONT-SIZE: =
12pt">b3<O:P>=20
                  </O:P></SPAN></P></TD>
                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; =
PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 131.15pt; =
PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; =
mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid =
windowtext .5pt"=20
                vAlign=3Dtop width=3D175>
                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
                  align=3Dcenter><SPAN lang=3DEN-US=20
                  style=3D"FONT-SIZE: =
12pt">C/R=C1=D0/=D0=D0=D2=F4=D1=A1=D4=F1<O:P> </O:P></SPAN></P></TD>
                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; =
PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 152.95pt; =
PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; =
mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid =
windowtext .5pt"=20
                vAlign=3Dtop width=3D204>
                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
                  align=3Dcenter><SPAN lang=3DEN-US=20
                  style=3D"FONT-SIZE: 12pt">b2=3D1,</SPAN><SPAN =
lang=3DEN-US=20
                  style=3D"FONT-SIZE: 12pt; mso-ascii-font-family: =
=C1=A5=CA=E9; mso-fareast-font-family: =C1=A5=CA=E9">=A1=B1</SPAN><SPAN=20
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12pt">=C2=DF=BC=AD=A1=B0=CA=B9=C4=DC=B2=FA=C9=FA=B5=A5=D2=F4=D0=C5=BA=C5<=
SPAN lang=3DEN-US><O:P>=20
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            <P class=3DMsoNormal style=3D"TEXT-ALIGN: center" =
align=3Dcenter><SPAN=20
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12pt"><O:P></O:P></SPAN></P>
            <P class=3DMsoNormal style=3D"TEXT-ALIGN: center" =
align=3Dcenter><SPAN=20
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12pt">=D7=B4=CC=AC=BC=C4=B4=E6=C6=F7=B9=A6=C4=DC<SPAN lang=3DEN-US><O:P> =

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MARGIN-LEFT: 15.9pt; BORDER-LEFT: medium none; BORDER-BOTTOM: medium =
none; BORDER-COLLAPSE: collapse; mso-border-alt: solid windowtext .5pt; =
mso-padding-alt: 0cm 5.4pt 0cm 5.4pt"=20
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                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: =
5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: =
47.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid"=20
                vAlign=3Dtop width=3D63>
                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
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12pt">=D7=B4=CC=AC=CE=BB<SPAN=20
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                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: =
5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 126pt; =
PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; =
mso-border-left-alt: solid windowtext .5pt"=20
                vAlign=3Dtop width=3D168>
                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
                  align=3Dcenter><SPAN style=3D"FONT-SIZE: =
12pt">=C3=FB=B3=C6<SPAN=20
                  lang=3DEN-US><O:P> </O:P></SPAN></SPAN></P></TD>
                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: =
5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 5cm; =
PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; =
mso-border-left-alt: solid windowtext .5pt"=20
                vAlign=3Dtop width=3D189>
                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
                  align=3Dcenter><SPAN style=3D"FONT-SIZE: =
12pt">=D7=B4=CC=AC=B1=EA=D6=BE=D6=C3=CE=BB<SPAN=20
                  lang=3DEN-US><O:P> </O:P></SPAN></SPAN></P></TD>
                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: =
5.4pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 95.2pt; =
PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; =
mso-border-left-alt: solid windowtext .5pt"=20
                vAlign=3Dtop width=3D127>
                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
                  align=3Dcenter><SPAN style=3D"FONT-SIZE: =
12pt">=D7=B4=CC=AC=B1=EA=D6=BE=C7=E5=B3=FD<SPAN=20
                  lang=3DEN-US><O:P> </O:P></SPAN></SPAN></P></TD></TR>
              <TR>
                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; =
PADDING-BOTTOM: 0cm; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: =
47.25pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; =
mso-border-top-alt: solid windowtext .5pt"=20
                vAlign=3Dtop width=3D63>
                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
                  align=3Dcenter><SPAN lang=3DEN-US style=3D"FONT-SIZE: =
12pt">b0<O:P>=20
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                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; =
PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 126pt; =
PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; =
mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid =
windowtext .5pt"=20
                vAlign=3Dtop width=3D168>
                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
                  align=3Dcenter><SPAN lang=3DEN-US style=3D"FONT-SIZE: =
12pt">IRQ<O:P>=20
                  </O:P></SPAN></P></TD>
                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; =
PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 5cm; PADDING-TOP: =
0cm; BORDER-BOTTOM: windowtext 0.5pt solid; mso-border-left-alt: solid =
windowtext .5pt; mso-border-top-alt: solid windowtext .5pt"=20
                vAlign=3Dtop width=3D189>
                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
                  align=3Dcenter><SPAN style=3D"FONT-SIZE: =
12pt">=B7=A2=C9=FA=D6=D0=B6=CF=A3=BB<SPAN=20
                  lang=3DEN-US>b1=BB=F2b2=3D0<O:P> =
</O:P></SPAN></SPAN></P></TD>
                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: medium none; PADDING-LEFT: 5.4pt; =
PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 95.2pt; =
PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 0.5pt solid; =
mso-border-left-alt: solid windowtext .5pt; mso-border-top-alt: solid =
windowtext .5pt"=20
                vAlign=3Dtop width=3D127>
                  <P class=3DMsoNormal style=3D"TEXT-ALIGN: center"=20
                  align=3Dcenter><SPAN style=3D"FONT-SIZE: =
12pt">=B6=C1=D7=B4=CC=AC=BC=C4=B4=E6=C6=F7=C7=E5=B3=FD<SPAN=20
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              <TR>
                <TD=20
                style=3D"BORDER-RIGHT: windowtext 0.5pt solid; =
PADDING-RIGHT: 5.4pt; BORDER-TOP: med
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