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XRT75L02 Datasheet(PDF) 4 Page - Exar Corporation |
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XRT75L02 Datasheet(HTML) 4 Page - Exar Corporation |
4 / 50 page xr xr xr xr XRT75L02 REV. 1.0.3 TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER I TABLE OF CONTENTS GENERAL DESCRIPTION................................................................................................. 1 FEATURES ..................................................................................................................................................... 1 APPLICATIONS ............................................................................................................................................... 1 TRANSMIT INTERFACE CHARACTERISTICS ....................................................................................................... 2 RECEIVE INTERFACE CHARACTERISTICS ......................................................................................................... 2 FIGURE 1. BLOCK DIAGRAM OF THE XRT 75L02 .............................................................................................................................. 2 FIGURE 2. PIN OUT OF THE XRT75L02............................................................................................................................................ 3 ORDERING INFORMATION .................................................................................................................... 3 TABLE OF CONTENTS ............................................................................................................ I PIN DESCRIPTIONS (BY FUNCTION) ............................................................................. 4 TRANSMIT INTERFACE .................................................................................................................................... 4 RECEIVE INTERFACE ...................................................................................................................................... 6 CLOCK INTERFACE......................................................................................................................................... 8 CONTROL AND ALARM INTERFACE........................................................................................................ 9 MODE SELECT............................................................................................................................................ 11 MICROPROCESSOR SERIAL INTERFACE - (HOST MODE)......................................................................... 11 JITTER ATTENUATOR INTERFACE .................................................................................................................. 12 ANALOG POWER AND GROUND .................................................................................................................... 13 DIGITAL POWER AND GROUND...................................................................................................................... 13 1.0 ELECTRICAL CHARACTERISTICS ................................................................................................... 15 TABLE 1: ABSOLUTE MAXIMUM RATINGS......................................................................................................................................... 15 TABLE 2: DC ELECTRICAL CHARACTERISTICS: ................................................................................................................................ 15 2.0 TIMING CHARACTERISTICS .............................................................................................................. 16 FIGURE 3. TYPICAL INTERFACE BETWEEN TERMINAL EQUIPMENT AND THE XRT75L02 (DUAL-RAIL DATA) .......................................... 16 FIGURE 4. TRANSMITTER TERMINAL INPUT TIMING .......................................................................................................................... 16 FIGURE 5. RECEIVER DATA OUTPUT AND CODE VIOLATION TIMING ................................................................................................... 17 FIGURE 6. TRANSMIT INTERFACE CIRCUIT FOR E3, DS3 AND STS-1 RATES .................................................................................... 17 3.0 LINE SIDE CHARACTERISTICS: ....................................................................................................... 18 3.1 E3 LINE SIDE PARAMETERS: ...................................................................................................................... 18 FIGURE 7. PULSE MASK FOR E3 (34.368 MBITS/S) INTERFACE AS PER ITU-T G.703......................................................................... 18 TABLE 3: E3 TRANSMITTER LINE SIDE OUTPUT AND RECEIVER LINE SIDE INPUT SPECIFICATIONS ....................................................... 18 FIGURE 8. BELLCORE GR-253 CORE TRANSMIT OUTPUT PULSE TEMPLATE FOR SONET STS-1 APPLICATIONS ............................ 19 TABLE 4: STS-1 PULSE MASK EQUATIONS ..................................................................................................................................... 19 TABLE 5: STS-1 TRANSMITTER LINE SIDE OUTPUT AND RECEIVER LINE SIDE INPUT SPECIFICATIONS (GR-253) .............................. 20 FIGURE 9. TRANSMIT OUPUT PULSE TEMPLATE FOR DS3 AS PER BELLCORE GR-499 ..................................................................... 20 TABLE 6: DS3 PULSE MASK EQUATIONS ........................................................................................................................................ 21 TABLE 7: DS3 TRANSMITTER LINE SIDE OUTPUT AND RECEIVER LINE SIDE INPUT SPECIFICATIONS (GR-499) ................................. 21 FIGURE 10. MICROPROCESSOR SERIAL INTERFACE STRUCTURE ..................................................................................................... 22 FIGURE 11. TIMING DIAGRAM FOR THE MICROPROCESSOR SERIAL INTERFACE ................................................................................ 22 TABLE 8: MICROPROCESSOR SERIAL INTERFACE TIMINGS ( TA = 250C, VDD=3.3V± 5% AND LOAD = 10PF) .................................. 23 4.0 THE TRANSMITTER SECTION: ......................................................................................................... 24 4.1 TRANSMIT CLOCK: ....................................................................................................................................... 24 4.2 B3ZS/HDB3 ENCODER: ................................................................................................................................ 24 4.2.1 B3ZS ENCODING: ...................................................................................................................................................... 24 FIGURE 12. SINGLE-RAIL OR NRZ DATA FORMAT (ENCODER AND DECODER ARE ENABLED)............................................................ 24 FIGURE 13. DUAL-RAIL DATA FORMAT (ENCODER AND DECODER ARE DISABLED) ............................................................................. 24 4.2.2 HDB3 ENCODING:...................................................................................................................................................... 25 4.3 TRANSMIT PULSE SHAPER: ........................................................................................................................ 25 FIGURE 14. B3ZS ENCODING FORMAT ........................................................................................................................................... 25 FIGURE 15. HDB3 ENCODING FORMAT .......................................................................................................................................... 25 4.3.1 GUIDELINES FOR USING TRANSMIT BUILD OUT CIRCUIT: ................................................................................. 26 4.3.2 INTERFACING TO THE LINE:.................................................................................................................................... 26 4.4 TRANSMIT DRIVE MONITOR: ....................................................................................................................... 26 FIGURE 16. TRANSMIT DRIVER MONITOR SET-UP. ........................................................................................................................... 26 4.5 TRANSMITTER SECTION ON/OFF: .............................................................................................................. 27 5.0 THE RECEIVER SECTION: ................................................................................................................. 27 5.1 AGC/EQUALIZER: .......................................................................................................................................... 27 5.1.1 INTERFERENCE TOLERANCE: ................................................................................................................................ 27 |
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