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xr XRT85L61
BITS (BUILDING INTEGRATED TIMING SUPPLY) CLOCK EXTRACTOR REV. 1.0.2
I
TABLE OF CONTENTS
GENERAL DESCRIPTION................................................................................................. 1
APPLICATIONS ............................................................................................................................................... 1
FIGURE 1. BLOCK DIAGRAM OF THE XRT85L61 ............................................................................................................................... 1
ORDERING INFORMATION .................................................................................................................... 2
FIGURE 2. PIN OUT OF THE XRT85L61............................................................................................................................................ 2
PIN DESCRIPTIONS .......................................................................................................... 3
ELECTRICAL CHARACTERISTICS.................................................................................. 5
ABSOLUTE MAXIMUM RATINGS ............................................................................................................. 5
TABLE 1: DC Electrical Characteristics .................................................................................................. 5
TABLE 2: E1 RECEIVER SENSITIVITY................................................................................................................................................. 5
TABLE 3: T1 RECEIVER SENSITIVITY................................................................................................................................................. 6
TABLE 4: 64KBITS/SEC RECEIVER SENSITIVITY ................................................................................................................................. 6
FIGURE 3. TIMING DIAGRAM FOR SYSTEM INTERFACE ....................................................................................................................... 6
TABLE 5: AC ELECTRICAL SPECIFICATIONS....................................................................................................................................... 7
FUNCTIONAL DESCRIPTION ........................................................................................... 8
1.0 OPERATING MODE: ............................................................................................................................. 8
TABLE 6: OPERATING MODE SELECTION........................................................................................................................................... 8
1.1 64 KHZ CLOCK MODE: ................................................................................................................................... 8
TABLE 7: G.703 SPECIFICATION FOR THE 64 KHZ CLOCK SIGNAL AT INPUT PORT ............................................................................... 8
TABLE 8: G.703 SPECIFICATION FOR THE 64 KHZ CLOCK SIGNAL AT OUTPUT PORT............................................................................ 9
1.1.1 64 KHZ + 8 KHZ CLOCK EXTRACTION...................................................................................................................... 9
FIGURE 4. INPUT DATA 64 KHZ + 8 KHZ OPERATION (S1 = 0, S2 = 0, S3 = 0)................................................................................... 9
1.1.2 64 KHZ + 8 KHZ + 400 HZ CLOCK EXTRACTION ...................................................................................................... 9
FIGURE 5. INPUT DATA 64 KHZ + 8 KHZ + 400 HZ OPERATION (S1 = 0, S2 = 0, S3 = 1) ................................................................. 10
1.2 2048 KHZ RZ E1 MODE ................................................................................................................................. 10
FIGURE 6. E1 PULSE MASK (G.703) .............................................................................................................................................. 10
TABLE 9: G.703 SPECIFICATION E1 ............................................................................................................................................... 11
1.3 2048 KHZ NRZ MODE .................................................................................................................................... 12
FIGURE 7. E1 CLOCK SIGNAL WAVE SHAPE - G.703 ...................................................................................................................... 12
TABLE 10: G.703 2048 KHZ CLOCK INTERFACE ............................................................................................................................. 12
1.4 1544 KHZ T1 MODE ....................................................................................................................................... 13
FIGURE 8. G.703 DS1 WAVE FORM............................................................................................................................................... 13
2.0 AIS DETECTION TIMING ................................................................................................................... 14
FIGURE 9. AIS DETECTION FOR E1 MODE ...................................................................................................................................... 14
FIGURE 10. AIS DETECTION FOR T1 MODE .................................................................................................................................... 14
3.0 LOSS OF SIGNAL ............................................................................................................................... 14
4.0 APPLICATIONS ................................................................................................................................... 15
FIGURE 11. CEPT APPLICATION FOR TWISTED PAIR INTERFACE ..................................................................................................... 15
FIGURE 12. CEPT APPLICATION FOR COAXIAL INTERFACE.............................................................................................................. 15
FIGURE 13. T1 APPLICATION FOR TWISTED PAIR INTERFACE........................................................................................................... 15
FIGURE 14. 64KBPS APPLICATION FOR TWISTED PAIR...................................................................................................................... 16
TRANSFORMER RECOMENDATION ................................................................................................................. 16
FIGURE 15. CONNECTING THE PULSE ENGINEERING PE-65535 1:2CT TRANSFORMER TO THE XRT85L61 ...................................... 16
ORDERING INFORMATION .................................................................................................................. 17
REVISION HISTORY ............................................................................................................................ 18