XRT82D20_06 Datasheet, PDF (3/27 Pages) Exar Corporation – SINGLE CHANNEL E1 LINE INTERFACE UNIT

REV. 1.0.8
XRT82D20
SINGLE CHANNEL E1 LINE INTERFACE UNIT
TABLE OF CONTENTS
GENERAL DESCRIPTION................................................................................................ 1
FEATURES................................................................................................................................................. 1
APPLICATIONS.......................................................................................................................................... 1
FIGURE 1. BLOCK DIAGRAM OF THE XRT82D20............................................................................................................................... 1
FIGURE 2. PINOUT OF THE XRT82D20............................................................................................................................................. 2
ORDERING INFORMATION .............................................................................................................................. 2
TABLE OF CONTENTS ............................................................................................................ I
PIN DESCRIPTIONS ......................................................................................................... 3
FIGURE 3. INTERFACE TIMING DIAGRAM IN BOTH SINGLE-RAIL AND DUAL-RAIL MODE, WITH DIGI (PIN 17) = “0” ............................... 6
FIGURE 4. INTERFACE TIMING DIAGRAM IN DUAL-RAIL MODE ONLY, WITH DIGI (PIN 17) = “1” ........................................................... 6
ELECTRICAL CHARACTERISTICS................................................................................. 7
TABLE 1: RECEIVER CHARACTERISTICS ............................................................................................................................................ 7
TABLE 2: TRANSMITTER CHARACTERISTICS ....................................................................................................................................... 7
TABLE 3: 3.3V POWER CONSUMPTION INCLUDING LINE POWER DISSIPATION, TRANSMISSION AND RECEIVE PATHS ALL ACTIVE .......... 7
TABLE 4: 5V POWER CONSUMPTION INCLUDING LINE POWER DISSIPATION, TRANSMISSION AND RECEIVE PATHS ALL ACTIVE ............. 8
TABLE 5: AC ELECTRICAL CHARACTERISTICS .................................................................................................................................. 8
TABLE 6: DC ELECTRICAL CHARACTERISTICS ................................................................................................................................... 9
ABSOLUTE MAXIMUM RATINGS.............................................................................................................. 9
FIGURE 5. RECEIVER MAXIMUM JITTER TOLERANCE, TEST CONDITIONS: TEST PATTERN 215-1, (-6DB) CABLE LOSS ....................... 10
FIGURE 6. RECEIVER JITTER TRANSFER FUNCTION (JITTER ATTENUATOR DISABLED), TEST CONDITIONS: TEST PATTERN 215-1, INPUT JIT-
TER 0.5UIP-P ................................................................................................................................................................ 10
FIGURE 7. RECEIVER JITTER TRANSFER FUNCTION (JITTER ATTENUATOR ENABLED) TEST CONDITIONS: TEST PATTERN 215-1, INPUT JITTER
75% OF MAXIMUM JITTER TOLERANCE........................................................................................................................... 11
SYSTEM DESCRIPTION................................................................................................. 12
1.0 THE RECEIVE SECTION....................................................................................................................... 12
1.1 JITTER ATTENUATOR ..................................................................................................................................... 12
1.2 THE TRANSMIT SECTION................................................................................................................................ 12
FIGURE 8. ILLUSTRATION ON HOW THE XRT82D20 SAMPLES THE DATA ON THE TPOS AND TNEG INPUT PINS ................................ 13
1.3 THE PULSE SHAPING CIRCUIT ...................................................................................................................... 13
FIGURE 9. ILLUSTRATION OF THE ITU-T G.703 PULSE TEMPLATE FOR E1 APPLICATION .................................................................. 14
1.4 INTERFACING THE TRANSMIT SECTION OF THE XRT82D20 TO THE LINE.............................................. 15
FIGURE 10. ILLUSTRATION OF HOW TO INTERFACE THE XRT82D20 TO THE LINE FOR 75 OHM APPLICATIONS AND 3.3V OPERATION ONLY
15
FIGURE 11. ILLUSTRATION OF HOW TO INTERFACE THE XRT82D20 TO THE LINE FOR 120 OHM APPLICATIONS AND 3.3V OPERATION ONLY
16
1.5 INTERFACING THE RECEIVE SECTION TO THE LINE.................................................................................. 17
FIGURE 12. RECOMMENDED SCHEMATIC FOR TRANSFORMER-COUPLING THE XRT82D20 TO THE LINE FOR 75 OHM APPLICATIONS AND 5
V OPERATION ONLY ....................................................................................................................................................... 17
FIGURE 13. RECOMMENDED SCHEMATIC FOR TRANSFORMER-COUPLING THE XRT82D20 TO THE LINE FOR 120 OHM APPLICATIONS AND 5
V OPERATION ONLY ....................................................................................................................................................... 18
1.6 CAPACITIVELY-COUPLING THE RECEIVE SECTION(S) OF THE XRT82D20 TO THE LINE...................... 19
FIGURE 14. CAPACITIVELY-COUPLING THE RECEIVE SECTION FOR 75 OHM APPLICATION AND 3.3V SUPPLY ..................................... 19
FIGURE 15. CAPACITIVELY-COUPLING THE RECEIVE SECTION FOR 120 OHM APPLICATION AND 3.3V SUPPLY ................................... 20
FIGURE 16. CAPACITIVELY-COUPLING THE RECEIVE SECTION FOR 75 OHM APPLICATION AND 5V SUPPLY ........................................ 21
FIGURE 17. CAPACITIVELY-COUPLING THE RECEIVE SECTION FOR 120 OHM APPLICATION AND 5V SUPPLY ...................................... 22
2.0 DIAGNOSTIC FEATURES..................................................................................................................... 23
2.1 THE LOCAL LOOP-BACK MODE .................................................................................................................... 23
FIGURE 18. ILLUSTRATION OF THE ANALOG LOCAL LOOP-BACK WITHIN THE XRT82D20 .................................................................. 23
2.2 THE REMOTE LOOP BACK MODE.................................................................................................................. 24
FIGURE 19. ILLUSTRATION OF THE REMOTE LOOP-BACK PATH, WITHIN THE XRT82D20................................................................... 24
PACKAGE OUTLINE DRAWING.................................................................................... 25
REVISION HISTORY ..................................................................................................................................... 26
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