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CS61582-IQ5 Datasheet(PDF) 27 Page - Cirrus Logic |
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CS61582-IQ5 Datasheet(HTML) 27 Page - Cirrus Logic |
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27 / 32 page  nected together at the device. A 4.99k Ω ± 1% re- sistor must be connected from BGREF to ground to provide an internal current reference. De-coupling and filtering of the power supplies is crucial for the proper operation of the analog cir- cuits. A capacitor should be connected between each supply and its respective ground. For capaci- tors smaller than 1 µF, use mylar or ceramic capacitors and place them as close as possible to their respective power supply pins. Wire-wrap bread boarding of the line interface is not recom- mended because lead resistance and inductance defeat the function of the de-coupling capacitors. Crystal Oscillator When a reference clock signal is not available, a CMOS crystal oscillator operating at either the 1X or 8X rate can be connected at the REFCLK pin. The oscillator must have a minimum symme- try of 40-60% and minimum stability of ±100 ppm for T1 and E1 applications. Based on these specifications, some suggested crystal oscillators for use with the CS61582 are shown in Table Α2. Transformers Recommended transformer specifications are shown in Table A3. Based on these specifications, the transformers recommended for use with the CS61582 are listed in Table A4. Line Protection Secondary protection components can be added to the line interface circuitry to provide lightning surge and AC power-cross immunity. For addi- tional information on the different electrical safety standards and specific application circuit recommendations, refer to the Crystal Semicon- ductor Application Note "Secondary Line Protection for T1 and E1 Line Cards." Manufacturer Part Number Contact Number Comclok CT31CH (800) 333-9825 CTS CXO-65HG-5-I (815) 786-8411 M-tron MH26TAD (800) 762-8800 SaRonix NTH250A (800) 227-8974 Notes: Frequency tolerances are ±32 ppm with a -40 to +85 °C operating temperature range. All are 8-pin DIP packages and can be tristated. Table A2. Suggested Crystal Oscillators Turns ratio 1:1.15 step-up transmit 1:1.15 step-down receive Primary inductance 1.5 mH min at 772 kHz Primary leakage inductance 0.3 µH max at 772 kHz with secondary shorted Secondary leakage inductance 0.4 µH max at 772 kHz Interwinding capacitance 18 pF max, primary to secondary ET-constant 16 V- µs min Table A3. Transformer Specifications DS224PP1 27 |
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