XRT75L04 Datasheet, PDF (4/57 Pages) Exar Corporation – FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER

XRT75L04
FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
TABLE OF CONTENTS
REV. 1.0.4
GENERAL DESCRIPTION .................................................................................................1
FEATURES .....................................................................................................................................................1
APPLICATIONS ................................................................................................................................................1
FIGURE 1. BLOCK DIAGRAM OF THE XRT 75L04 .............................................................................................................................. 2
TRANSMIT INTERFACE CHARACTERISTICS........................................................................................................2
RECEIVE INTERFACE CHARACTERISTICS..........................................................................................................2
FIGURE 2. PIN OUT OF THE XRT75L04............................................................................................................................................ 3
ORDERING INFORMATION.....................................................................................................................3
TABLE OF CONTENTS ............................................................................................................ I
PIN DESCRIPTIONS (BY FUNCTION) .............................................................................4
TRANSMIT INTERFACE.....................................................................................................................................4
RECEIVE INTERFACE.......................................................................................................................................7
CLOCK INTERFACE .........................................................................................................................................9
CONTROL AND ALARM INTERFACE.................................................................................................................10
OPERATING MODE SELECT ..........................................................................................................................12
SERIAL MICROPROCESSOR INTERFACE .........................................................................................................12
JITTER ATTENUATOR INTERFACE...................................................................................................................13
ANALOG POWER AND GROUND .....................................................................................................................14
DIGITAL POWER AND GROUND ......................................................................................................................16
1.0 ELECTRICAL CHARACTERISTICS ....................................................................................................17
TABLE 1: ABSOLUTE MAXIMUM RATINGS......................................................................................................................................... 17
TABLE 2: DC ELECTRICAL CHARACTERISTICS: ................................................................................................................................ 17
2.0 TIMING CHARACTERISTICS ..............................................................................................................18
FIGURE 3. TYPICAL INTERFACE BETWEEN TERMINAL EQUIPMENT AND THE XRT75L04 (DUAL-RAIL DATA)........................................... 18
FIGURE 4. TRANSMITTER TERMINAL INPUT TIMING .......................................................................................................................... 18
FIGURE 5. RECEIVER DATA OUTPUT AND CODE VIOLATION TIMING ................................................................................................... 19
FIGURE 6. TRANSMIT INTERFACE CIRCUIT FOR E3, DS3 AND STS-1 RATES .................................................................................... 19
3.0 LINE SIDE CHARACTERISTICS: ........................................................................................................20
3.1 E3 LINE SIDE PARAMETERS: ...................................................................................................................... 20
FIGURE 7. PULSE MASK FOR E3 (34.368 MBITS/S) INTERFACE AS PER ITU-T G.703 ......................................................................... 20
TABLE 3: E3 TRANSMITTER LINE SIDE OUTPUT AND RECEIVER LINE SIDE INPUT SPECIFICATIONS........................................................ 20
FIGURE 8. BELLCORE GR-253 CORE TRANSMIT OUTPUT PULSE TEMPLATE FOR SONET STS-1 APPLICATIONS............................. 21
TABLE 4: STS-1 PULSE MASK EQUATIONS ..................................................................................................................................... 21
TABLE 5: STS-1 TRANSMITTER LINE SIDE OUTPUT AND RECEIVER LINE SIDE INPUT SPECIFICATIONS (GR-253) .............................. 22
FIGURE 9. TRANSMIT OUPUT PULSE TEMPLATE FOR DS3 AS PER BELLCORE GR-499 ..................................................................... 22
TABLE 6: DS3 PULSE MASK EQUATIONS ........................................................................................................................................ 23
TABLE 7: DS3 TRANSMITTER LINE SIDE OUTPUT AND RECEIVER LINE SIDE INPUT SPECIFICATIONS (GR-499) ................................. 23
FIGURE 10. MICROPROCESSOR SERIAL INTERFACE STRUCTURE...................................................................................................... 24
FIGURE 11. TIMING DIAGRAM FOR THE MICROPROCESSOR SERIAL INTERFACE ................................................................................ 24
TABLE 8: MICROPROCESSOR SERIAL INTERFACE TIMINGS ( TA = 250C, VDD=3.3V± 5% AND LOAD = 10PF) .................................. 25
4.0 THE TRANSMITTER SECTION: ..........................................................................................................26
FIGURE 12. SINGLE-RAIL OR NRZ DATA FORMAT (ENCODER AND DECODER ARE ENABLED) ............................................................ 26
FIGURE 13. DUAL-RAIL DATA FORMAT (ENCODER AND DECODER ARE DISABLED) ............................................................................. 26
4.1 TRANSMIT CLOCK: ....................................................................................................................................... 26
4.2 B3ZS/HDB3 ENCODER: ................................................................................................................................. 26
4.2.1 B3ZS ENCODING: ...................................................................................................................................................... 26
FIGURE 14. B3ZS ENCODING FORMAT ........................................................................................................................................... 27
4.2.2 HDB3 ENCODING:...................................................................................................................................................... 27
FIGURE 15. HDB3 ENCODING FORMAT .......................................................................................................................................... 27
4.3 TRANSMIT PULSE SHAPER: ........................................................................................................................ 27
4.3.1 GUIDELINES FOR USING TRANSMIT BUILD OUT CIRCUIT: ................................................................................. 28
4.3.2 INTERFACING TO THE LINE: .................................................................................................................................... 28
4.4 TRANSMIT DRIVE MONITOR: ....................................................................................................................... 28
FIGURE 16. TRANSMIT DRIVER MONITOR SET-UP. ........................................................................................................................... 28
4.5 TRANSMITTER SECTION ON/OFF: .............................................................................................................. 30
5.0 THE RECEIVER SECTION: .................................................................................................................30
5.1 AGC/EQUALIZER: .......................................................................................................................................... 30
5.1.1 INTERFERENCE TOLERANCE: ................................................................................................................................ 31
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