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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CS89712 датащи(PDF) 161 Page - Cirrus Logic |
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CS89712 датащи(HTML) 161 Page - Cirrus Logic |
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161 / 170 page  CS89712 DS502PP2 161 ETHERNET QUARTZ CRYSTAL REQUIREMENTS (If a 20 MHz quartz crystal is used, it must meet the following specifications) Parameter Min Typ Max Unit Parallel Resonant Frequency - 20 - MHz Resonant Frequency Error (CL = 18 pF) -50 - +50 ppm Resonant Frequency Change Over Operating Temperature -40 - +40 ppm Crystal Capacitance - - 18 pF Motional Crystal Capacitance - 0.022 - pF Series Resistance - - 50 Ohm Shunt Capacitance - - 7 pF Rt Rt TD + TD - TXD + TXD - RJ45 1 2 RD + RD - 3 6 0.01 µF + RXD+ RXD- Rr Rr 0.01 µF - 560 pF 1:2.5 1:1 Figure 37. 10Base-T Wiring Notes: 1. If a center tap transformer is used on the RXD+ and RXD- inputs, replace the pair of Rr resistors with a single 2xRr resistor. 2. The Rt and Rr resistors are ±1% tolerance. 3. The CS89712 Ethernet port supports 100 W unshielded twisted pair cables. The proper values of Rt and Rr, for a given cable impedance, are shown below: Cable Impedance ( Ω)Rt (Ω) Rr ( Ω) 100 8.2 49.9 |
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