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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DB929B датащи(PDF) 9 Page - CML Microcircuits |
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DB929B датащи(HTML) 9 Page - CML Microcircuits |
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9 / 51 page  4-Level FSK Modem Data Pump Page 9 of 50 MX929B PRELIMINARY INFORMATION ©2001 MX-COM, INC. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480171.003 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies. Recommended External Component Notes: 1. See Section 4.1.10. 2. For best results, a crystal oscillator design should drive the clock inverter input with signal levels of at least 40% of VDD, peak to peak. Tuning fork crystals generally cannot meet this requirement. To obtain crystal oscillator design assistance, consult your crystal manufacturer. 3. The values used for C3 and C4 should be suitable for the frequency of the crystal X1. As a guide, values (including stray capacitance) of 33pF at 1MHz falling to 18pF at 10MHz will generally prove suitable. Crystal frequency tolerances are discussed in Section 4.5.3.4. 4. Values C5 and C8 should be equal to 750,000 / symbol rate, e.g. Symbol Rate C5 and C8 2400 symbols/second 330pF 4800 symbols/second 150pF 9600 symbols/second 82pF 5. Values C6 and C7 should be equal to 50,000 / symbol rate, e.g. Symbol Rate C6 and C7 2400 symbols/second 0.022 PF 4800 symbols/second 0.01 PF 9600 symbols/second 4700pF |
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