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XRT82D20 Datasheet(PDF) 3 Page - Exar Corporation |
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XRT82D20 Datasheet(HTML) 3 Page - Exar Corporation |
3 / 27 page XRT82D20 SINGLE CHANNEL E1 LINE INTERFACE UNIT áç áç áç áç REV. 1.0.7 I 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 PIN DESCRIPTIONS .......................................................................................................... 3 Figure 3. Interface Timing Diagram in Both Single-Rail and Dual-Rail Mode, with DIGI (Pin 17) = “0” . 5 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 Jitter 0.5UIp-p ............................................................................................................................ 11 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 .... 12 1.3 THE PULSE SHAPING CIRCUIT ........................................................................................................................... 12 Figure 9. Illustration of the ITU-T G.703 Pulse Template for E1 Application .......................................... 13 1.4 INTERFACING THE TRANSMIT SECTION OF THE XRT82D20 TO THE LINE ............................................................. 14 Figure 10. Illustration of how to interface the XRT82D20 to the Line for 75 Ω Ω Ω Ω Applications and 3.3V op- eration only .................................................................................................................................................... 14 Figure 11. Illustration of how to interface the XRT82D20 to the Line for 120 Ω Ω Ω Ω Applications and 3.3V op- eration only .................................................................................................................................................... 15 1.5 INTERFACING THE RECEIVE SECTION TO THE LINE ............................................................................................. 15 Figure 12. Recommended Schematic for Transformer-Coupling the XRT82D20 to the Line for 75 Ω Ω Ω Ω Ap- plications and 5 V operation only ................................................................................................................ 16 Figure 13. Recommended Schematic for Transformer-Coupling the XRT82D20 to the Line for 120 Ω Ω Ω Ω Ap- plications and 5 V operation only ................................................................................................................ 17 1.6 CAPACITIVELY-COUPLING THE RECEIVE SECTION(S) OF THE XRT82D20 TO THE LINE ......................................... 18 Figure 14. Capacitively-coupling the Receive Section for 75 Ω Ω Ω Ω Application and 3.3V supply ............. 18 Figure 15. Capacitively-coupling the Receive Section for 120 Ω Ω Ω Ω Application and 3.3V supply ........... 19 Figure 16. Capacitively-coupling the Receive Section for 75 Ω Ω Ω Ω Application and 5V supply ................ 20 Figure 17. Capacitively-coupling the Receive Section for 120 Ω Ω Ω Ω Application and 5V supply .............. 21 2.0 Diagnostic Features ......................................................................................................................... 22 2.1 THE LOCAL LOOP-BACK MODE ......................................................................................................................... 22 Figure 18. Illustration of the Analog Local Loop-Back within the XRT82D20 ........................................ 22 2.2 THE REMOTE LOOP BACK MODE ....................................................................................................................... 23 Figure 19. Illustration of the Remote Loop-Back path, within the XRT82D20 ........................................ 23 |
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