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XRT73L03BIV Datasheet(PDF) 4 Page - Exar Corporation |
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XRT73L03BIV Datasheet(HTML) 4 Page - Exar Corporation |
4 / 61 page XRT73L03B 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT REV. 1.0.1 I TABLE OF CONTENTS GENERAL DESCRIPTION ................................................................................................. 1 FEATURES .................................................................................................................................................... 1 APPLICATIONS ......................................................................................................................................... 1 TYPICAL APPLICATIONS ................................................................................................................................. 2 TRANSMIT INTERFACE CHARACTERISTICS: ..................................................................................................... 2 RECEIVE INTERFACE CHARACTERISTICS: ....................................................................................................... 2 ORDERING INFORMATION ............................................................................................... 3 PIN DESCRIPTIONS (BY FUNCTION) .............................................................................. 4 TRANSMIT INTERFACE ................................................................................................................................... 4 RECEIVE INTERFACE ..................................................................................................................................... 6 CLOCK INTERFACE ........................................................................................................................................ 7 OPERATING MODE SELECT ........................................................................................................................... 7 CONTROL AND ALARM INTERFACE ................................................................................................................. 9 MICROPROCESSOR INTERFACE .................................................................................................................... 11 POWER AND GROUND PINS ......................................................................................................................... 13 NO CONNECTION PINS ................................................................................................................................ 14 ELECTRICAL CHARACTERISTICS ................................................................................ 15 ABSOLUTE MAXIMUM RATINGS .................................................................................................................... 15 SYSTEM DESCRIPTION .................................................................................................. 24 THE TRANSMIT SECTION - CHANNELS 0, 1 AND 2 ......................................................................................... 24 THE RECEIVE SECTION - CHANNELS 0, 1 AND 2 ........................................................................................... 24 THE MICROPROCESSOR SERIAL INTERFACE ................................................................................................. 24 1.0 Selecting the Data Rate .................................................................................................................... 25 1.1 CONFIGURING CHANNEL(N) ............................................................................................................................... 25 2.0 The Transmit Section ....................................................................................................................... 27 COMMAND REGISTER, CR4-(N) ...................................................................................................... 27 2.1 THE TRANSMIT LOGIC BLOCK ............................................................................................................................ 27 2.1.1 Accepting Dual-Rail Data from the Terminal Equipment ...................................................................... 27 2.1.2 Accepting Single-Rail Data from the Terminal Equipment ................................................................... 28 COMMAND REGISTER CR1-(N) ....................................................................................................... 28 2.2 THE TRANSMIT CLOCK DUTY CYCLE ADJUST CIRCUITRY ................................................................................... 29 2.3 THE HDB3/B3ZS ENCODER BLOCK .................................................................................................................. 29 2.3.1 B3ZS Encoding .................................................................................................................................... 29 2.3.2 HDB3 Encoding .................................................................................................................................... 30 2.3.3 Disabling the HDB3/B3ZS Encoder ..................................................................................................... 30 COMMAND REGISTER CR2-(N) ....................................................................................................... 30 2.4 THE TRANSMIT PULSE SHAPING CIRCUITRY ....................................................................................................... 31 2.4.1 Enabling the Transmit Line Build-Out Circuit ....................................................................................... 32 COMMAND REGISTER, CR1-(N) ...................................................................................................... 32 2.4.2 Disabling the Transmit Line Build-Out Circuit ....................................................................................... 32 COMMAND REGISTER, CR1-(N) ...................................................................................................... 33 2.4.3 Design Guideline for Setting the Transmit Line Build-Out Circuit ......................................................... 33 2.4.4 The Transmit Line Build-Out Circuit and E3 Applications .................................................................... 33 2.5 INTERFACING THE TRANSMIT SECTIONS OF THE XRT73L03B TO THE LINE ......................................................... 33 TRANSFORMER RECOMMENDATIONS ............................................................................................... 34 3.0 The Receive Section ......................................................................................................................... 35 3.1 INTERFACING THE RECEIVE SECTIONS OF THE XRT73L03B TO THE LINE ........................................................... 35 3.2 THE RECEIVE EQUALIZER BLOCK ...................................................................................................................... 36 3.2.1 Guidelines for Setting the Receive Equalizer ...................................................................................... 36 COMMAND REGISTER CR2-(N) ....................................................................................................... 37 3.3 CLOCK RECOVERY PLL .................................................................................................................................... 38 3.3.1 The Training Mode ............................................................................................................................... 38 3.3.2 The Data/Clock Recovery Mode .......................................................................................................... 38 |
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