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CS61884-IQ Datasheet(PDF) 53 Page - Cirrus Logic |
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CS61884-IQ Datasheet(HTML) 53 Page - Cirrus Logic |
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53 / 72 page  CS61884 DS485PP4 53 18.1 Transformer specifications Recommended transformer specifications are shown in Table 12. Any transformer used with the CS61884 should meet or exceed these specifica- tions. 18.2 Crystal Oscillator Specifications When a reference clock signal is not available, a CMOS crystal oscillator may be used as the refer- ence clock signal. The oscillator must have a mini- mum symmetry of 40-60% and minimum stability of + 100ppm for both E1 and T1/J1 applications. 18.3 Designing for AT&T 62411 For information on requirements of the AT&T 62411 and the design of the appropriate system synchronizer, refer to Application Note AN012 “AT&T 62411 Design Considerations - Jitter and Synchronization” and Application Note AN011 “Jitter Testing Procedures for Compliance with AT&T 62411”. 18.4 Line Protection Secondary protection components can be added to the line interface circuitry to provide lightning surge and AC power-cross immunity. For addition- al information on the different electrical safety standards and specific applications circuit recom- mendations, refer to Application Note AN034 “Secondary Line Protection for T1 and E1 Cards”. Table 12. Transformer Specifications Descriptions Specifications Turns Ratio Receive/Trans- mit 1:2 Primary Inductance 1.5mH min. @ 772 kHz Primary Leakage Induc- tance 0.3 µH max @ 772 kHz Secondary leakage Induc- tance 0.4 µH max @ 772 kHz Inter winding Capacitance 18pF max, primary to secondary ET-Constant 16V - µsmin. |
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Similar Description - CS61884-IQ |
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