XRT5997IVTR-F

XRT5997 Seven-Channel E1 Line Interface Unit November 1999-2 FEATURES The Main features are as follows: l Consists of Seven (7) Independent E1 (CEPT) Line Interface Units (Transmitter and Receiver) l Generates Transmit Output Pulses that are Compliant with the ITU-T G.703 Pulse Template Requirement for 2.048Mbps (E1) Rates l On-Chip Pulse Shaping for both 75Ω and 120Ω line drivers l Receiver Can Either Be Transformer or Capacitive-Coupled to the Line l Detects and Clears LOS (Loss of Signal) Per ITU-T G.775 l Compliant with the ITU-T G.823 Jitter Tolerance Requirements l Compliant with ITU G. 703 EOS Over-voltage protection Requirement l l l l Logic Inputs Accept Either 3.3V or 5.0V Levels Operates over the Industrial Temperature Range Ultra Low Power Dissipation +3.3V Supply Operation APPLICATIONS l l l l l PDH Multiplexers SDH Multiplexers Digital Cross-Connect Systems DECT (Digital European Cordless Telephone) Base Stations CSU/DSU Equipment GENERAL DESCRIPTION The XRT5997 is an optimized seven-channel analog E1 line interface unit fabricated using low power 3.3V CMOS technology. Each channel consists of both a Transmitter and a Receiver function. The Transmitter accepts a TTL or CMOS level signal from the Terminal Equipment; and outputs this data to the line via bipolar pulses that are compliant to the ITU-T G.703 pulse template for E1. The Receiver accepts an attenuated bipolar line signal (from the remote terminal equipment) and outputs this data to the (near-end) terminal equipment via CMOS level signals. Each Receiver input can be transformer or capacitivecoupled to the line. The Receiver input is transformercoupled to the line, using a 2:1 step-down transformer. Each Transmitter is coupled to the line using a 1:2 stepup transformer. This same configuration is applicable for both balanced (120Ω ) and unbalanced (75Ω ) interfaces. ORDERING INFORMATION Part No. Package Operating Temperature Range XRT5997IV 100-Lead TQFP (14 x 14 x 1.4 mm) -40°C to +85°C Rev. 1.0.0 EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com XRT5997 Channel 7 Channel 6 Channel 5 Channel 4 RxLO S Channel 3 Channel 2 Channe l1 RTIP RRing Receiv Receive e Equalizer Equalizer TTIP Peak Peak Detector/ Detector/ Slice Slicer r LO LOSS Detecto Detector r PulsePulse Shaping Shaping Circuit Circuit TRing Figure 1. XRT5997 Block Diagram Rev. 1.0.0 2 Receive Receive O utput O utput Interfac Interface e Transm it Transm it Input Input Interface Interface RxPO S RxNEG TxPO S TxNEG TxClk XRT5997 TxClk6 TxPOS6 LOS6 77 76 80 TxNEG6 TGND6 81 78 TTIP6 82 79 TRing6 TVDD6 83 DGND 84 87 TxNEG7 TxClk7 88 TxPOS7 DGND 89 85 TTIP7 90 86 TRing7 TVDD7 91 TRing1 TGND7 92 TVDD1 TTIP1 93 94 TxClk1 97 95 TxNEG1 98 TGND1 TxPOS1 99 96 LOS1 100 PIN CONFIGURATION R xPO S 1 1 75 R xN E G 1 R xPO S 6 2 74 R xN E G 6 DVDD 3 73 DGND LO S7 4 72 AG N D R xPO S 7 5 71 R T IP6 R xN E G 7 6 70 R R ing6 R T IP1 7 69 R T IP7 R R ing1 8 68 R R ing7 67 AV D D 66 AG N D 65 AV D D AV D D 9 AG N D 10 AV D D R R ing2 11 12 R T IP2 13 AG N D 14 T T IP2 100-Pin TQFP X RT 5997IV 15 TVDD2 16 T R ing2 17 64 R R ing5 63 R T IP5 62 TGND5 61 T T IP5 60 TVDD5 59 T R ing5 TGND4 TGND2 18 58 T R ing3 19 57 T R ing4 TVDD3 20 56 TVDD4 21 55 T T IP4 22 54 DGND 53 R T IP4 24 52 R R ing4 25 51 T xC lk4 Rev. 1.0.0 3 50 48 LOS4 49 47 RxPOS4 TxPOS4 46 TxNEG4 45 TxPOS5 44 100 LEAD THIN QUAD FLAT PACK (14 x 14 x 1.4 mm., TQFP) RxNEG4 43 42 RxNEG5 TxClk5 41 TxNEG5 40 37 DVDD LOS5 36 LOS2 RxPOS5 35 RxPOS2 DGND 34 RxNEG2 39 33 TxClk2 38 32 DVDD 31 TxPOS2 TxNEG2 30 RxPOS3 RxNEG3 28 LOS3 29 27 T xC lk3 23 26 R T IP3 R R ing3 TxPOS3 TGND3 TxNEG3 T T IP3 XRT5997 PIN DESCRIPTION Pin# Symbol Type 1 RxPOS1 O Description Receiver 1 Positive Data Out: This output pin will pulse “high” whenever Channel 1, within the XRT5997 device has received a “Positive Polarity” pulse, in the incoming line signal, at RTIP1/RRing1 inputs. 2 RxNEG1 O Receiver 1 Negative Data Out: This output pin will pulse “high” whenever Channel 1, within the XRT5997 device has received a “Negative Polarity” pulse, in the incoming line signal, at tRTIP1/RRing1 inputs. 3 DVDD - Positive Supply - (+3.3V ± 5%). Digital Circuitry. 4 LOS7 O Receiver 7 Loss of Signal Output Indicator: This output pin toggles “high” if Channel 7, within the XRT5997 device has detected a “Loss of Signal” condition in the incoming line signal. 5 RxPOS7 O Receiver 7 Positive Data Out: This output pin will pulse “high” whenever Channel 7, within the XRT5997 device has received a “Positive Polarity” pulse, in the incoming line signal, at RTIP7/RRing7 inputs. 6 RxNEG7 O Receiver 7 Negative Data Out: This output pin will pulse “high” whenever Channel 7, within the XRT5997 device has received a “Negative Polarity” pulse, in the incoming line signal, at RTIP7/RRing7 inputs. 7 RTIP1 I Receiver 1 Positive Bipolar Input: The Receive Section of Channel 1 uses this input pin, along with RRing1 to receive the bipolar line signal from the “Remote E1 Terminal”. 8 RRing1 I Receiver 1 Negative Bipolar Input: The Receive Section of Channel 1 uses this input pin, along with RTIP1 to receive the bipolar line signal from the “Remote E1 Terminal”. 9 AVDD - Positive Supply - (+3.3V ± 5%). Analog Circuitry. 10 AGND - Analog Ground 11 AVDD 12 RRing2 I Receiver 2 Negative Bipolar Input: The Receive Section of Channel 2 uses this input pin, along with RTIP2 to receive the bipolar line signal from the “Remote E1 Terminal”. 13 RTIP2 I Receiver 2 Positive Bipolar Input: The Receive Section of Channel 2 uses this input pin, along with RRing2 to receive the bipolar line signal from the “Remote E1 Terminal”. Positive Supply - (+3.3V ± 5%). Receiver 1, 2, 3, 5. Rev. 1.0.0 4 XRT5997 PIN DESCRIPTION (CONT'D) Pin# Symbol Type Description 14 AGND - Analog Ground - Receiver 1, 2, 3, 5. 15 TTIP2 O Transmitter 2 Positive Bipolar Output: Channel 2 within the XRT5997 device will use this pin, along with TRing2, to transmit a bipolar line signal, via a 1:2 step-up transformer. 16 TVDD2 - Positive Supply - (+3.3V ± 5%), Transmitters 2. 17 TRing2 O Transmitter 2 Negative Bipolar Output: Channel 2 within the XRT5997 device will use this pin, along with TTIP2, to transmit a bipolar line signal, via a 1:2 step-up transformer. 18 TGND2 Digital Ground - Transmitters 2. 19 TRing3 20 TVDD3 21 TTIP3 22 TGND3 23 RTIP3 I Receiver 3 Positive Bipolar Input. The Receive Section of Channel 4 uses this input pin, along with RRing3 to receive the bipolar line signal from the “Remote E1 Terminal”. 24 RRing3 I Receiver 3 Negative Bipolar Input. The Receive Section of Channel 3 uses this input pin, along with RTIP3 to receive the bipolar line signal from the “Remote E1 Terminal”. 25 TxClk3 I Transmitter Clock Input – Channel 3: If the user operates Channel 3 (within the XRT5997 device) in the “clocked” mode, then the “Transmit Section” of the Channel 3 will use the falling edge of this signal to sample the data at the TxPOS3 and TxNEG3 input pins. O Transmitter 3 Negative Bipolar Output: Channel 3 within the XRT5997 device will use this pin, along with TTIP3, to transmit a bipolar line signal, via a 1:2 step-up transformer. Positive Supply - (+3.3V ± 5%), Transmitters 3. O Transmitter 3 Positive Bipolar Output: Channel 3 within the XRT5997 device will use this pin, along with TRing3, to transmit a bipolar line signal, via a 1:2 step-up transformer. Digital Ground - Transmitters 3. Note: If the user operates the Channel 3 in the “clockless” mode, then the Terminal Equipment should not apply a clock signal to this input pin. Rev. 1.0.0 5 XRT5997 PIN DESCRIPTION (CONT'D) Pin# Symbol Type 26 TxNEG3 I Description Transmitter - Negative Data Input – Channel 3: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of Channel 3) in the “Clocked” or “Clockless” Mode. Clocked Mode: The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “negativepolarity” pulse onto the line via TTIP3 and TRing3 output pins. The XRT5997 device will sample this input pin upon the falling edge of the TClk3 signal. Clockless Mode: The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “negative-polarity” pulse onto the line viaTTIP3 and TRing3 output pins. 27 TxPOS3 I Transmitter - Positive Data Input – Channel 3: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of Channel 3) in the “Clocked” or “Clockless” Mode. Clocked Mode: The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “positivepolarity” pulse onto the line via TTIP1 and TRing1 output pins. The XRT5997 device will sample this input pin upon the falling edge of the TClk1 signal. Clockless Mode: The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line via TTIP1 and TRing1 output pins). 28 LOS3 O Receiver 3 – Loss of Signal Output Indicator: This output pin toggles “high” if Channel 3, within the XRT5997 device has detected a “Loss of Signal” condition in the incoming line signal. 29 RxPOS3 O Receiver 3 Positive Data Out: This output pin will pulse “high” whenever Channel 3, within the XRT5997 device has received a “Positive Polarity” pulse, in the incoming line signal, at RTIP3/RRing3 inputs. Rev. 1.0.0 6 XRT5997 PIN DESCRIPTION (CONT'D) Pin# Symbol Type Description 30 RxNEG3 O Receiver 3 Negative Data Out: This output pin will pulse “high” whenever Channel 3, within the XRT5997 device has received a “Negative Polarity” pulse, in the incoming line signal, at RTIP3/RRing3 inputs. 31 TxPOS2 I Transmitter - Positive Data Input – Channel 2: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of Channel 2) in the “Clocked” or “Clockless” Mode. Clocked Mode: The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line via TTIP2 and TRing2 output pins). The XRT5997 device will sample this input pin upon the falling edge of the TClk2 signal. Clockless Mode: The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line via TTIP2 and TRing2 output pins. 32 TxNEG2 I Transmitter - Negative Data Input – Channel 2: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of the Channel 2) in the “Clocked” or “Clockless” Mode. Clocked Mode: The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “negative-polarity” pulse onto the line via TTIP2 and TRing2 output pins. The XRT5997 device will sample this input pin upon the falling edge of the TClk2 signal. Clockless Mode: The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “negative-polarity” pulse onto the line via TTIP2 and TRing2 output pins. 33 TxClk2 I Transmitter Clock Input – Channel 2: If the user operates Channel 2 (within the XRT5997 device) in the “clocked” mode, then the “Transmit Section” of the Channel 2 will use the falling edge of this signal to sample the data at the TxPOS2 and TxNEG2 input pins. Note If the user operates the Channel 2 in the “clockless” mode, then the Terminal Equipment should not apply a clock signal to this input pin. Note: 1 Internally pull-up with 50K resistor. Rev. 1.0.0 7 XRT5997 PIN DESCRIPTION (CONT'D) Pin# Symbol Type Description 34 RxNEG2 O Receiver 2 Negative Data Out: This output pin will pulse “high” whenever Channel 2, within the XRT5997 device has received a “Negative Polarity” pulse, in the incoming line signal, at RTIP2/RRing2 inputs. 35 RxPOS2 O Receiver 2 Positive Data Out: This output pin will pulse “high” whenever Channel 2, within the XRT5997 device has received a “Positive Polarity” pulse, in the incoming line signal, at RTIP2/RRing2 inputs. 36 LOS2 O Receiver 2 Loss of Signal: This output pin toggles “high” if Channel 2, within the XRT5997 device has detected a “Loss of Signal” condition in the incoming line signal. 37 DVDD - Positive Supply (+3.3V ± 5%). Digital Circuitry. 38 DVDD - Positive Supply (+3.3V ± 5%). Digital Circuitry. 39 DGND - Digital Ground: Digital Circuitry. 40 LOS5 O Receiver 5 Loss of Signal: This output pin toggles “high” if Channel 5, within the XRT5997 device has detected a “Loss of Signal” condition in the incoming line signal. Note: 1Internally pull-up with 50K resistor 41 RxPOS5 O Receiver 5 Positive Data Out: This output pin will pulse “high” whenever Channel 5, within the XRT5997 device has received a “Positive Polarity” pulse, in the incoming line signal, at RTIP5/RRing5 inputs. 42 RxNEG5 O Receiver 5 Negative Data Out: This output pin will pulse “high” whenever Channel 5, within the XRT5997 device has received a “Negative Polarity” pulse, in the incoming line signal, at RTIP5/RRing5 inputs. 43 TxClk5 I Transmitter Clock Input – Channel 5: If the user operates Channel 5 (within the XRT5997 device) in the “clocked” mode, then the “Transmit Section” of the Channel 5 will use the falling edge of this signal to sample the data at the TxPOS5 and TxNEG5 input pins. NOTE: If the user operates the Channel 5 in the “clockless” mode, then the Terminal Equipment should not apply a clock signal to this input pin. Note: 1 Internally pull-up with 50K resistor. Rev. 1.0.0 8 XRT5997 PIN DESCRIPTION (CONT'D) Pin# Symbol Type 44 TxNEG5 I Description Transmitter - Negative Data Input – Channel 5: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of the Channel 5) in “Clocked” or “Clockless” Mode. Clocked Mode: The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “negative-polarity” pulse onto the line via TTIP5 and TRing5 output pins. The XRT5997 device will sample this input pin upon the falling edge of the TCLK5 signal. Clockless Mode: The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “negative-polarity” pulse onto the line via TTIP5 and TRing5 output pins. 45 TxPOS5 I Transmitter - Positive Data Input – Channel 5: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of Channel 5) in the “Clocked” or “Clockless” Mode. Clocked Mode: The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line via TTIP5 and TRing5 output pins. The XRT5997 device will sample this input pin upon the falling edge of the TClk5 signal. Clockless Mode: The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line via TTIP5 and TRing5 output pins. 46 RxNEG4 O Receiver 4 Negative Data Out: This output pin will pulse “high” whenever Channel 4, within the XRT5997 device has received a “Negative Polarity” pulse, in the incoming line signal, at the RTIP4/RRing4 inputs. 47 RxPOS4 O Receiver 4 Positive Data Out: This output pin will pulse “high” whenever Channel 4, within the XRT5997 device has received a “Positive Polarity” pulse, in the incoming line signal, at RTIP4/RRing4 inputs. Rev. 1.0.0 9 XRT5997 PIN DESCRIPTION (CONT'D) Pin# Symbol Type Description 48 LOS4 O Receiver 4 Loss of Signal: This output pin toggles “high” if Channel 4, within the XRT5997 device has detected a “Loss of Signal” condition in the incoming line signal. 49 TxPOS4 O Transmitter - Positive Data Input – Channel 4: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of Channel 4) in the “Clocked” or “Clockless” Mode. Clocked Mode: The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line via TTIP4 and TRing4 output pins). The XRT5997 device will sample this input pin upon the falling edge of the TClk4 signal. Clockless Mode: The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line via TTIP4 and TRing4 output pins. 50 TxNEG4 I Transmitter - Negative Data Input – Channel 4: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of the Channel 4) in the “Clocked” or “Clockless” Mode. In the Clocked Mode: The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “negative-polarity” pulse onto the line via the TTIP4 and TRing4 output pins. The XRT5997 device will sample this input pin upon the falling edge of the TClk4 signal. In the Clockless Mode: The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “negative-polarity” pulse onto the line (via the TTIP4 and TRing4 output pins). 51 TxClk4 I Transmitter Clock Input – Channel 4: If the user operates Channel 4 (within the XRT5997 device) in the “clocked” mode, then the “Transmit Section” of the Channel 4 will use the falling edge of this signal to sample the data at the TxPOS4 and TxNEG4 input pins. Note: If the user operates the Channel 4 in the “clockless” mode, then the Terminal Equipment should not apply a clock signal to this input pin. 52 RRing4 I Receiver 4 Negative Bipolar Input: The Receive Section of Channel 4 uses this input pin, along with RTIP4 to receive the bipolar line signal from the “Remote E1 Terminal”. Rev. 1.0.0 10 XRT5997 PIN DESCRIPTION (CONT'D) Pin# Symbol Type Description 53 RTIP4 I 54 DGND 55 TTIP4 56 TVDD4 57 TRing4 58 TGND4 59 TRing5 60 TVDD5 61 TTIP5 62 TGND5 63 RTIP5 I 64 RRing5 I 65 AVDD Positive Supply (+3.3V ± 5%). Analog Circuitry. 66 AGND Analog Ground. 67 AVDD Positive Supply (+3.3V ± 5%). Receiver 4, 6, 7. 68 RRing7 Receiver 4 Positive Bipolar Input. The Receive Section of Channel 4 uses this input pin, along with RRing4 to receive the bipolar line signal from the “Remote E1 Terminal”. Digital Ground. Digital Circuitry. O Transmitter 4 Positive Bipolar Output. Channel 4 within the XRT5997 device will use this pin, along with TRing4, to transmit a bipolar line signal, via a 1:2 step-up transformer. Positive Supply (+3.3V ± 5%), Transmitters 4. O Transmitter 4 Negative Bipolar Output. Channel 4 within the XRT5997 device will use this pin, along with TTIP4, to transmit a bipolar line signal, via a 1:2 step-up transformer. Digital Ground. Transmitters 4. O Transmitter 5 Negative Bipolar Output. Channel 5 within the XRT5997 device will use this pin, along with TTIP5, to transmit a bipolar line signal, via a 1:2 step-up transformer. Positive Supply (+3.3V ± 5%), Transmitters 5. O Transmitter 5 Positive Bipolar Output. Channel 5 within the XRT5997 device will use this pin, along with TRing5, to transmit a bipolar line signal, via a 1:2 step-up transformer. Digital Ground. Transmitters 5. I Receiver 5 Positive Bipolar Input. The Receive Section of Channel 5 uses this input pin, along with RRing5 to receive the bipolar line signal from the “Remote E1 Terminal”. Receiver 5 Negative Bipolar Input. The Receive Section of Channel 5 uses this input pin, along with RTIP5 to receive the bipolar line signal from the “Remote E1 Terminal”. Receiver 7 Negative Bipolar Input. The Receive Section of Channel 7 uses this input pin, along with RTIP7 to receive the bipolar line signal from the “Remote E1 Terminal”. Rev. 1.0.0 11 XRT5997 PIN DESCRIPTION (CONT'D) Pin# Symbol Type Description 69 RTIP7 I Receiver 7 Positive Bipolar Input: The Receive Section of Channel 7 uses this input pin, along with RRing7 to receive the bipolar line signal from the “Remote E1 Terminal”. 70 RRing6 I Receiver 6 Negative Bipolar Input: The Receive Section of Channel 6 uses this input pin, along with RTIP6 to receive the bipolar line signal from the “Remote E1 Terminal”. 71 RTIP6 I Receiver 6 Positive Bipolar Input: The Receive Section of Channel 6 uses this input pin, along with RRing6 to receive the bipolar line signal from the “Remote E1 Terminal”. 72 AGND Analog Ground. Receiver 4, 6, 7. 73 DGND3 Digital Ground. Digital Circuitry. 74 RxNEG6 O Receiver 6 Negative Data Out: This output pin will pulse “high” whenever Channel 6, within the XRT5997 device has received a “Negative Polarity” pulse, in the incoming line signal, at RTIP6/RRing6 inputs. 75 RxPOS6 O Receiver 6 Positive Data Out: This output pin will pulse “high” whenever Channel 6, within the XRT5997 device has received a “Positive Polarity” pulse, in the incoming line signal, at RTIP6/RRing6 inputs. 76 LOS6 O 77 TxPOS6 I Receiver 6 Loss of Signal: This output pin toggles “high” if Channel 6, within the XRT5997 device has detected a “Loss of Signal” condition in the incoming line signal. Transmitter - Positive Data Input – Channel 6: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of Channel 6) in the “Clocked” or “Clockless” Mode. Clocked Mode: The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line via TTIP6 and TRing6 output pins. The XRT5997 device will sample this input pin upon the falling edge of the TClk6 signal. Clockless Mode: The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line via TTIP6 and TRing6 output pins. Rev. 1.0.0 12 XRT5997 PIN DESCRIPTION (CONT'D) Pin# Symbol Type 78 TxNEG6 I Description Transmitter - Negative Data Input – Channel 6: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of the Channel 6) in the “Clocked” or “Clockless” Mode. Clocked Mode: The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “negative-polarity” pulse onto the line via TTIP6 and TRing6 output pins. The XRT5997 device will sample this input pin upon the falling edge of the TClk6 signal. Clockless Mode: The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “negative-polarity” pulse onto the line via TIP6 and TRing6 output pins. 79 TxClk6 I Transmitter Clock Input – Channel 6: If the user operates Channel 6 (within the XRT5997 device) in the “clocked” mode, then the “Transmit Section” of the Channel 6 will use the falling edge of this signal to sample the data at the TxPOS6 and TxNEG6 input pins. Note: If the user operates the Channel 6 in the “clockless” mode, then the Terminal Equipment should not apply a clock signal to this input pin. 80 TGND6 81 TTIP6 82 TVDD6 83 TRing6 84 DGND Digital Ground. Transmitters 6. O Transmitter 6 Positive Bipolar Output: Channel 6 within the XRT5997 device will use this pin, along with TRing6, to transmit a bipolar line signal, via a 1:2 step-up transformer. Positive Supply (+3.3V ± 5%), Transmitters 6. O Transmitter 6 Negative Bipolar Output: Channel 6 within the XRT5997 device will use this pin, along with TTIP6, to transmit a bipolar line signal, via a 1:2 step-up transformer. Digital Ground. Digital Circuitry. Rev. 1.0.0 13 XRT5997 PIN DESCRIPTION (CONT'D) Pin# Symbol Type 85 TxPOS7 I Description Transmitter - Positive Data Input – Channel 7: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of Channel 7) in the “Clocked” or “Clockless” Mode. Clocked Mode: The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line via TTIP7 and TRing7 output pins. The XRT5997 device will sample this input pin upon the falling edge of the TClk7 signal. Clockless Mode: The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line via TTIP7 and TRing7 output pins. 86 TxNEG7 I Transmitter - Negative Data Input – Channel 7: 87 TxClk7 I Transmitter Clock Input – Channel 7: If the user operates Channel 7 (within the XRT5997 device) in the “clocked” mode, then the “Transmit Section” of the Channel 7 will use the falling edge of this signal to sample the data at the TxPOS7 and TxNEG7 input pins. Note: If the user operates the Channel 7 in the “clockless” mode, then the Terminal Equipment should not apply a clock signal to this input pin. 88 DGND 89 TTIP7 90 TVDD7 91 TRing7 92 TGND7 93 TRing1 94 TVDD1 Digital Ground: Digital Circuitry. O Transmitter 7 Positive Bipolar Output: Channel 7 within the XRT5997 device will use this pin, along with TRing7, to transmit a bipolar line signal, via a 1:2 step-up transformer. Positive Supply: (+3.3V ± 5%), Transmitters 7. O Transmitter 7 Negative Bipolar Output: Channel 7 within the XRT5997 device will use this pin, along with TTIP7, to transmit a bipolar line signal, via a 1:2 step-up transformer. Digital Ground: Transmitters 7. O Transmitter 1 Negative Bipolar Output: Channel 1 within the XRT5997 device will use this pin, along with TTIP1, to transmit a bipolar line signal, via a 1:2 step-up transformer. Positive Supply (+3.3V ± 5%), Transmitters 1. Rev. 1.0.0 14 XRT5997 PIN DESCRIPTION (CONT'D) Pin# Symbol Type 95 TTIP1 O 96 TGND1 97 TxClk1 Description Transmitter 1 Positive Bipolar Output. Channel 1 within the XRT5997 device will use this pin, along with TRing1, to transmit a bipolar line signal, via a 1:2 step-up transformer. Digital Ground. Transmitters 1. I Transmitter Clock Input – Channel 1: If the user operates Channel 1 (within the XRT5997 device) in the “clocked” mode, then the “Transmit Section” of the Channel 1 will use the falling edge of this signal to sample the data at the TxPOS1 and TxNEG1 input pins. Note: If the user operates the Channel 1 in the “clockless” mode, then the Terminal Equipment should not apply a clock signal to this input pin.. 98 TxNEG1 I Transmitter - Negative Data Input – Channel 1: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of the Channel 1) in the “Clocked” or “Clockless” Mode. Clocked Mode: The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “negative-polarity” pulse onto the line via TTIP1 and TRing1 output pins. The XRT5997 device will sample this input pin upon the falling edge of the TClk1 signal. Clockless Mode: The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “negative-polarity” pulse onto the line via TTIP1 and TRing1 output pins. 99 TxPOS1 I Transmitter - Positive Data Input – Channel 1: The exact signal that should be applied to this input pin depends upon whether the user intends to operate the “Transmit Section” (of Channel 1) in the “Clocked” or “Clockless” Mode. Clocked Mode: The Terminal Equipment should apply bit-wide NRZ pulses on this input pin, whenever the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line via TTIP1 and TRing1 output pins. The XRT5997 device will sample this input pin upon the falling edge of the TClk1 signal. Clockless Mode: The Terminal Equipment should apply RZ pulses to this input pin, anytime the Terminal Equipment needs to transmit a “positive-polarity” pulse onto the line via TTIP1 and TRing1 output pins. 100 LOS1 O Receiver 1 Loss of Signal: This output pin toggles “high” if Channel 1, within the XRT5997 device has detected a “Loss of Signal” condition in the incoming line signal. Rev. 1.0.0 15 XRT5997 RECEIVER ELECTRICAL CHARACTERISTICS Unless otherwise specified: TA=-40 to 85°C, VDD=3.3V±5%, unless otherwise specified. Parameter Min Typ Max Unit Test Conditions Threshold to Assert 12 20 - dB Threshold to Clear 11 15 Time Delay 10 - 255 bit Hysteresis - 5 - dB Receiver Sensitivity 11 13 - dB Below nominal pulse amplitude of 3.0V for 120Ω and 2.37V for 75Ω applications. With -18dB interference signal added. Interference Margin -18 -14 - dB With 6dB cable loss. 5 - - KΩ - - UIpp Receiver Loss of Signal: Input Impedance Cable attenuation @ 1024KHz dB Per ITU-G.775 Jitter Tolerance: 20Hz 10 700Hz 5 10KHz —100KHz 0.3 Return Loss: 51KHz —102KHz 14 - - dB 102KHz—2048KHz 20 - - dB 2048KHz—3072KHz 16 - - dB Per ITU-G.703 TRANSMITTER ELECTRICAL CHARACTERISTICS Unless otherwise specified: TA=-40 to 85°C, VDD=3.3V±5%, unless otherwise specified. Parameter Min Typ Max Unit 2.13 2.70 2.37 3.0 2.60 3.30 V V Output Pulse Width 224 244 264 ns Output Pulse Width Ratio 0.95 Output Pulse Amplitude Ratio Output Return Loss: 51KHz —102KHz 102KHz—2048KHz 2048KHz—3072KHz 0.95 − − 10 16 12 - Test Conditions AMI Output Pulse Amplitude: 75Ω Application 120Ω Application 1.05 − − - dB dB dB 1.05 Rev. 1.0.0 16 Use transformer with 1:2 ratio and 9.1Ω resistor in series with each end of primary. Per ITU-G.703 Per ITU-G.703 Per ETSI 300 166 and CH PTT XRT5997 269ns 244+50 V= 100 % 194ns 244-50 Normal Pulse 50 % 244 ns 219 ns 244-25 0% 20 % 244 ns 244+244 Figure E1. ITU G.703 Pulse Template for Transmitter Output DC ELECTRICAL CHARACTERISTICS TA=-25°C, VDD=3.3V±5%, unless otherwise specified. Parameter Symbol Min Power Supply Voltage VDD 3.13 3.3 3.46 V Input High Voltage Input Low Voltage Output High Voltage @ IOH=-5mA Output Low Voltage @ IOL=5mA Input Leakage Current (except Input pins w/ pull-up resistor.) Input Capacitance Output Load Capacitance VIH VIL 2.0 -0.5 - 5.0 0.8 V V VOH 2.4 - - V VOL IL - - 0.4 ± 10 V µA CI CL - 5.0 - 25 pF pF Rev. 1.0.0 17 Typ Max Unit XRT5997 AC ELECTRICAL CHARACTERISTICS TA=-25°C, VDD=3.3V±5%, unless otherwise specified. Parameter Symbol Min Typ Max Unit T1 - 488 - ns TCLK Duty Cycle T2 47 50 53 % Transmit Data Setup Time TSU 50 - - ns Transmit Data Hold Time THO 30 - - ns Transmit Data Prop. Delay Time T3 - 30 - ns TCLK Clock Period - RZ data Mode - NRZ data Mode (clock mode) TCLK Rise Time(10%/90%) TCLK Fall Time(90%/10%) - 30 - ns TR - - 40 ns TF - - 40 ns Rtr - - 40 ns Receive Data Fall Time Rtf - - 40 ns Receive Data Prop. Delay Rpd - 75 - ns Receive Data Pulse Width Rxpw 200 244 350 ns Receive Data Rise Time Per channel power consumption including the line power dissipation, tranmission and receive paths all active: TA=-40 to 85°C, VDD=3.3V±5%, unless otherwise specified. Parameter Symbol Min Typ Max Unit Conditions Power Consumption Power Consumption Power Consumption PC PC PC - 85 72 135 95 80 144 mW mW mW 75Ω load, operating at 50% Mark Density. 120Ω load, operating at 50% Mark Density. 75Ω load, operating at 100% Mark Density. Power Consumption Power Consumption PC PC - 106 16 115 18 mW mW 120Ω load, operating at 100% Mark Density. Transmitter in Powered-down mode. ABSOLUTE MAXIMUM RATINGS Storage Temperature Operating Temperature ESD Rating Supply Voltage ○ ○ ○ ○ ○ Note: 2 ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ -65°C to + 150°C -40°C to + 85°C >4000V on all pins2 -0.5V to + 6.0V ○ ○ ○ ○ ○ Human Body Model, 100pF capacitor discharged through a 1.5KΩ resistor. Rev. 1.0.0 18 XRT5997 SYSTEM DESCRIPTION 1.1 The Transmit Input Interface The XRT5997 device is a Seven (7) channel E1 transceiver that provides an electrical interface for 2.048Mbps applications. Each of the seven channels includes a receive circuit that converts an ITU-T G.703 compliant bipolar signal into a TTL compatible logic levels. Each receiver also includes an LOS (Loss of Signal) detection circuit. Similarly, in the Transmit Direction, each Transmitter converts TTL compatible logic levels into a G.703 compatible bipolar signal. The Transmitter may be operated in either a “Clocked” or “Clockless” Mode. The Transmit Input Interface accepts either “clocked” or “clockless” data from the Terminal Equipment. The manner in how the Terminal Equipment should apply data to a given channel within the XRT5997 device depends upon whether the channel is being operated in the “clocked” or “clockless” mode. 1.2.1 Operating the Transmitter in the Clocked Mode The user can configure a given channel (within the XRT5997 device) to operate in the “Clocked” mode by simply applying a 2.048MHz clock signal to the “TxClk_x” input pin (where x denotes a given channel within the XR5997 device). The XRT5997 device contains some circuitry that sense activity on the “TxClk_x” line. If this circuit senses activity on the “TxClk_x” line, then the corresponding channel will automatically be operating in the “Clocked” Mode. Each channel within the XRT5997 LIU device consists of both a Transmit Section and a Receive Section, each of these sections will be discussed in detail below. 1.0 The Transmit Section In general, the purpose of the “Transmit Section” (within each channel of the XRT5997 device) is to accept TTL/CMOS level digital data (from the Terminal Equipment), and to encode it into a format such that it can: In the Clocked Mode, the Terminal Equipment is expected to apply a 2.048MHz clock signal at the TxClk_x input pin and NRZ data at the TxPOS_x and TxNEG_x input pins. The “Transmit Input Interface” circuit will sample the data, at the TxPOS_x and TxNEG_x input pins, upon the falling edge of TxClk_x, as illustrated in Figure 3. 1. Be efficiently transmitted over coaxial- or twistedpair cable at the E1 data rate; and 2. Be reliably received by the Remote Terminal Equipment at the other end of the E1 data link. 3. Comply with the ITU-T G.703 pulse template requirements, for E1 applications. The circuitry that the Transmit Section (within the XRT5997 device) uses to accomplish this goal is discussed below. The Transmit Section of the XRT5997 device consists of the following blocks: • Transmit Input Interface • Pulse Shaping Block Rev. 1.0.0 19 XRT5997 tS U tH O TxP O S _x TxN E G _x TC lk_x Figure 2. Illustration on how the XRT5997 Device Samples the data on the TxPOS_x and TxNEG_x input pins In general, if the XRT5997 device samples a “1” on the TxPOS_x input pin, then the “Transmit Section” of the device will ultimately generate a positive polarity pulse via the TTIP_x and TRing_x output pins (across a 1:2 transformer). Conversely, if the XRT5997 device samples a “1” on the “TxNEG_x” input pin, then the “Transmit Section” of the device will ultimately generate a negative polarity pulse via the TTIP_x and TRing_x output pins (across a 1:2 transformer). 1.2.1 Operating the Transmitter in the “Clockless” Mode The user can configure a given channel (within the XRT5997 device) to operate in the “Clockless” mode by doing the following: • Not applying a clock signal to the TxClk_x input, and either pulling this pin to VDD or letting it float. • By applying RZ (Return to Zero) data to the TxPOS_x and TxNEG_x input pins, as illustrated below. Rev. 1.0.0 20 XRT5997 B it P e rio d Data 1 RZ P ulse is to be applied in the first half of the bit-period 1 No pulse is to be applied in the second half of the bit period 0 1 1 0 1 TxPO S _x TxNEG _x TxClk _x No Activity in TxClk Line Figure 3. Illustration on how the Terminal Equipment should apply data to the “Transmit Section” of a given Channel (within the XRT5997 Device), when operating in the “Clockless” Mode Figure 3, indicates that when the user is operating a channel in the “Clockless” Mode, then the corresponding Terminal Equipment must do the following: 1.3 The Pulse Shaping Circuit The purpose of the “Transmit Pulse Shaping” circuit is to generate “Transmit Output” pulses that comply with the ITU-T G.703 Pulse Template Requirements for E1 Applications. • Not apply a signal on the “TxClk_x” line. • When applying a pulse (to either the TxPOS_x or TxNEG_x input pin), apply an RZ pulse to the appropriate input pin. This RZ pulse should only have a width of one-half the bit-period. Addition, the RZ pulse should occupy only the first half of the bit-period. The TxPOS_x and TxNEG_x input pins must be at 0V, during the second half of every bit-period. Rev. 1.0.0 21 XRT5997 269ns (244 + 25) 194ns V = 100% Nominal Pulse 50% 244ns 219ns (244 - 25) 10% 0% 10% 20% Figure 4. Illustration of the ITU-T G.703 Pulse Template for E1 Applications However, in both applications (e.g., 75Ω or 120Ω), the user is advised to interface the Transmitter to the Line, in the manner as depicted in Figures 5 and 6, respectively. As a consequence, each channel (within the XRT5997 device) will take each mark (which is provided to it via the “Transmit Input Interface” block, and will generate a pulse that complies with the pulse template, presented in Figure 4, (when measured on the secondaryside of the Transmit Output Transformer). 1.4 Interfacing the Transmit Sections of the XRT5997 device to the Line ITU-T G.703 specifies that the E1 line signal can be transmitted over coaxial cable and terminated with 75Ω or transmitted over twisted-pair and terminated with 120Ω. Rev. 1.0.0 22 XRT5997 U1 99 TxPOS_1 TxPOS_1 1 95 R1 2 J1 TTIP_1 9.1 BNC 1 1:2 5 1 98 TxNEG_1 TxNEG_1 2 4 8 PE-65835 1 93 R2 2 TRING_1 9.1 97 TxLineClk_1 TxCLK_1 XRT5997 Figure 5. Illustration of how to interface the Transmit Sections of the Ω ” Applications) XRT5997 device to the Line (for “75Ω U1 99 TxPOS_1 TxPOS_1 95 1 R1 2 TTIP_1 9.1 1 TxNEG_1 1:2 5 TTIP_Channel_1 98 TxNEG_1 4 8 TRing_Channel_1 PE-65835 1 93 R2 2 TRing_1 9.1 TxLineClk_1 97 TxClk_1 XRT5997 Figure 6. Illustration of how to interface the Transmit Sections the Ω ” Applications) XRT5997 device to the Line (for “120Ω Notes: 1. Figures 5 and 6, indicate that for both “75Ω” and “120Ω” applications, the user should connect a 9.1Ω resistor, in series, between the TTIP/TRing outputs and the transformers. 2. Rev. 1.0.0 23 Figure 5 and 6, indicate that the user should use a “1:2 STEP-UP” Transformer. XRT5997 Transmit Transformer Recommendations Parameter Turns Ratio Primary Inductance Isolation Voltage Leakage Inductance Value 1:2 The following Transformers are Recommended for Use Part Number PE-65835 TTI 7154-R TG26-1205 Vendor Pulse Transpower Technologies, Inc. HALO Isolation Package Type Note: More transformers will be added to this list as we take the time to evaluate these transformers. Magnetic Supplier Information Pulse Corporate Office 12220 World Trade Drive San Diego, CA 92128 Tel: (619)-674-8100 FAX: (619)-674-8262 Transpower Technologies Corporate Office 9410 Prototype Drive, Ste #1 Reno, NV 89511 Tel: (800)511-7308 or (775)852-0140 Fax: (775)852-0145 www.trans-power.com Europe 1 & 2 Huxley Road The Surrey Research Park Guildford, Surrey GU2 5RE United Kingdom Tel: 44-1483-401700 FAX: 44-1483-401701 HALO Electronics P.O. Box 5826 Redwood City, CA 94063 Tel: (650)568-5800 FAX: (650)568-6161 Asia 150 Kampong Ampat #07-01/02 KA Centre Singapore 368324 Tel: 65-287-8998 FAX: 65-280-0080 Rev. 1.0.0 24 XRT5997 2.0 The Receive Section 2.1 Interfacing the Receive Sections to the Line The Receive Sections of the XRT5997 device consists of the following blocks: The design of each channel (within the XRT5997 device) permits the user to transformer-couple or capacitive-couple the Receive Section to the line. Additionally, as mentioned earlier, the specification documents for E1 specify 75Ω termination loads, when transmitting over coaxial cable, and 120Ω loads, when transmitting over twisted-pair. Figures 7 , through 9 present the various methods that the user can employ in order to interface the Receivers (of the XRT5997 device) to the line. • • • • The “Receive Equalizer” block The “Peak Detector” and “Slicer” block The “LOS Detector” block The “Receive Output Interface” block U1 RxPOS_1 1 7 RxPOS_1 RTIP_1 J1 BNC 1 1 1:2 5 4 8 1 R1 RxNEG_1 2 18.7 RxNEG_1 2 2 Loss of Signal - 1 100 PE-65835 8 RxLOS_1 RRing_1 XRT5997 Figure 7. Recommended Schematic for Interfacing the Receive Sections of the XRT5997 Ω Applications (Transformer-Coupling) Device to the Line for 75Ω Rev. 1.0.0 25 XRT5997 U1 RxPOS_1 1 7 RxPOS_1 RTIP_1 1 1 1:2 5 R1 RxNEG_1 2 RTIP_1 30.1 RxNEG_1 4 8 RRing_1 2 PE-65835 Loss of Signal - 1 100 8 RxLOS_1 RRing_1 XRT5997 Figure 8. Recommended Schematic for Interfacing the Receive Sections of the XRT5997 Ω Applications (Transformer-Coupling) Device to the Line for 120Ω Note: Figures 7 and 8 indicate that the user should use a “2:1 STEP-DOWN” transformer, when interfacing the receiver to the line. Transmit Transformer Recommendations Parameter Turns Ratio Primary Inductance Isolation Voltage Leakage Inductance Value 1:2 The following Transformers are Recommended for Use Part Number PE-65835 TTI 7154-R TG26-1205 Vendor Pulse Transpower Technologies, Inc. HALO Isolation Note: More transformers will be added to this list as we take the time to evaluate these transformers. Rev. 1.0.0 26 Package Type XRT5997 Capacitive-Coupling the Receiver to the Line Figure 9, presents a recommended approach that the user to employ when capacitive-coupling the Receive Section to the line. U1 J1 C1 RxPOS_1 1 7 RxPOS_1 1 BNC 2 1 R1 2 1 RTIP_1 37.4 0.1uF 2 1 RxNEG_1 2 R2 RxNEG_1 37.4 2 C2 Loss of Signal - 1 100 8 RxLOS_1 1 2 RRing_1 0.1uF XRT5997 Figure 9. Recommended Schematic for Interfacing the Receive Sections of the XRT5997 Device to Ω Applications (Capacitive-Coupling) the Line for 75Ω 2.2 The “Receive Equalizer” Bock After a given Channel (within the XRT5997 device) has received the incoming line signal, via the RTIP_x and RRing_x input pins, the first block that this signal will pass through is the Receive Equalizer block. frequency components. If this line signal travels over reasonably long cable lengths, then the shape of the pulses (which were originally square) will be distorted and with inter-symbol interference increases. As the line signal is transmitted from a given “Transmitting” terminal, the pulse shapes (at that location) are basically “square”. Hence, these pulses consist of a combination of “low” and “high” frequency Fourier components. As this line signal travels from the “transmitting terminal” (via the coaxial cable or twisted pair) to the receiving terminal, it will be subjected to “frequency-dependent” loss. In other words, the higher frequency components of the signal will be subjected to a greater amount of attenuation than the lower The purpose of this block is to equalize the incoming distorted signal, due to cable loss. In essence, the Receive Equalizer block accomplishes this by subjecting the received line signal to “frequency-dependent” amplification (which attempts to counter the frequency-dependent loss that the line signal has experienced). By doing this, the Receive Equalizer is attempting to restore the shape of the line signal so that the received data can be recovered reliably. Rev. 1.0.0 27 XRT5997 2.3 The “Peak Detector and Slicer Block with the “LOS Declaration/Clearance” requirements per ITU-T G.775. As a consequence, the channel will declare an LOS Condition, (by driving the “RxLOS” output pin “high”) if the received line signal amplitude drops to –20dB or below. Further, the channel will clear the LOS Condition if the signal amplitude rises back up to –15dB or above. Figure 10 presents an illustration that depicts the signal levels at which a given channel (within the XRT5997 device) will assert and clear LOS. After the incoming line signal has passed through the Receive Equalizer block, it will next be routed to the “Slicer” block. The purpose of the “Slicer” block is to quantify a given bit-period (or symbol) within the incoming line signal as either a “1” or a “0”. 2.3 The “LOS Detector” block The LOS Detector block, within each channel (of the XRT5997 device) was specifically designed to comply 0 dB Maximum Cable Loss for E1 LOS Signal Must be Cleared -6 dB -9dB LOS Signal may be Cleared or Declared -35dB LOS Signal Must be Declared Figure 10. Illustration of the Signal Levels that the Receiver Sections (within XRT5997 device) will declare and clear LOS Timing Requirements associated with Declaring and Clearing the LOS Indicator. The XRT5997 device was designed to meet the ITU-T G.775 specification timing requirements for declaring and clearing the LOS indicator. In particular, the XRT5997 device will declare an LOS, between 10 and 255 UI (or E1 bit-periods) after the actual time the LOS condition occurred. Further, the XRT5997 device will clear the LOS indicator within 10 to 255 UI after restoration of the incoming line signal. Figure 11 illustrates the LOS Declaration and Clearance behavior, in response to first, the “Loss of Signal” event and then afterwards, the restoration of the signal. Rev. 1.0.0 28 XRT5997 A ctu a l O cc u rre n ce o f L O S C o n d itio n L in e S ig n a l is R e sto re d R xIN 10 UI 255 UI T im e R a n g e fo r L O S D e cla ra tio n 10 UI 255 UI L O S O u tp u t P in 0 UI 0 UI G .7 7 5 C o m p lia n ce Note: F o r E 1 , 1 U I = 4 8 8 n s T im e R a n g e fo r L O S C le a ra n ce G .7 7 5 C o m p lia n ce Figure 11. The Behavior of the LOS Output Indicator, in response to the Loss of Signal, and the Restoration of the Signal 2.3 The “Receive Output Interface” block The purpose of the “Receive Output Interface” block is to interface directly with the “Receiving Terminal Equipment”. The “Receive Output Interface” block outputs the data (which has been recovered from the incoming line signal) to the “Receive Terminal Equipment” via the “RxPOS_x and RxNEG_x output pins. Note: The “Receive Output Interface” block does not supply a recovered clock. This device is intended to be used in those applications, where the “Clock Recovery” circuit is realized in an ASIC solution. 3.0 Shutting off the Transmitter If the “Receive Sections” of the XRT5997 device has received a “Positive-Polarity” pulse, via the RTIP_x and RRing_x input pins, then the Receive Output Interface will output a pulse via the “RxPOS_x” output pins. Each channel (within the XRT5997 device) permits the user to shut off the “Transmit Driver” within their respective “Transmit Section”. This feature can come in handy for system redundancy design considerations or during diagnostic testing. The user can activate this feature by either of the following ways. Similarly, if the “Receive Sections” of the XRT5997 device has received a “Negative-Polarity” pulse, via the RTIP_x and RRing_x input pins, then the Receive Output Interface will output a pulse via the “RxNEG_x” output pins. Method 1: Connect the Transmit Data input pins (e.g., TxPOS_x and TxNEG_x) to a logic “1”; or allow them to float. (These input pins have an internal “pull-up” resistor). Method 2: Connect the “TxClk_x” input pin to a logic “0” (e.g., GND) and continue to apply data via the TxPOS_x and TxNEG_x input pins. Rev. 1.0.0 29 XRT5997 NRZ Mode (Clock Mode) T1 TR T2 TF T C lk T SU T HO T xP O S o r TNEG T3 T XPW V T xO U T T T IP / T R in g RZ Mode (None-Clock Mode) T xP O S o r TNEG T3 T XPW V T xO U T T T IP / T R in g Figure 12. Transmit Timing Diagram R R in g /R T IP Rp d R xp w R xP O S R tr R tf R xN E G Figure 13. Receive Timing Diagram Rev. 1.0.0 30 XRT5997 APPLICATION INFORMATION Figures 14, 15 and 16, provide example schematics on how to interface Channel 1 of the XRT5997 device to the line, under the following conditions. • Receiver is Transformer-coupled to a 75Ω unbalanced line. • Receiver is Transformer-coupled to a 120Ω balanced line. • Receiver is Capacitive-coupled to a 75Ω unbalanced line. · U1 TxPOS_1 99 95 TxPOS_1 1 R1 BNC 9.1 TxNEG_1 98 J1 2 TTIP_1 1 1:2 5 1 TxNEG_1 2 4 TxLineClk_1 97 TxClk_1 TRing_1 93 1 R2 8 PE-65835 2 9.1 RxPOS_1 1 J2 7 RxPOS_1 RTIP_1 BNC 1 1:2 5 1 2 RxNEG_1 2 R3 RxNEG_1 2 18.7 4 100 RxLOS_1 RRing_1 8 1 Loss of Signal - 1 8 PE-65835 XRT5997 Figure 14. Illustration on how to interface Channel 1 (of the XRT5997 Device) to the Line Ω unbalanced line) (Receiver is Transformer-coupled to a 75Ω Rev. 1.0.0 31 XRT5997 U1 TxPOS_1 99 95 TxPOS_1 R1 1 2 TTIP_1 9.1 TxNEG_1 TxLineClk_1 1 1:2 5 4 8 TTIP_1 98 TxNEG_1 97 93 TxClk_1 R2 1 2 TRing_1 PE-65835 Tring_1 9.1 RxPOS_1 1 7 RxPOS_1 RTIP_1 1 1 1:2 5 R3 RxNEG_1 2 30.1 RxNEG_1 4 2 Loss of Signal - 1 100 8 RxLOS_1 RTIP_1 8 RRing_1 PE-65835 RRing_1 XRT5997 Figure 15, Illustration on how to interface Channel 1 (of the XRT5997 Device) to the Line Ω balanced line) (Receiver is Transformer-coupled to a 120Ω Rev. 1.0.0 32 XRT5997 U1 TxPOS_1 99 95 TxPOS_1 1 R1 J1 2 TTIP_1 BNC 9.1 TxNEG_1 1 1:2 5 4 8 1 98 TxNEG_1 2 TxLineClk_1 97 93 TxClk_1 TRing_1 1 R2 PE-65835 2 9.1 J2 C1 RxPOS_1 1 RxPOS_1 RTIP_1 7 1 BNC 2 1 R3 2 1 37.4 2 0.1uF 2 RxNEG_1 2 R4 RxNEG_1 37.4 C2 100 RxLOS_1 RRing_1 8 1 2 1 Loss of Signal - 1 0.1uF XRT5997 Figure 16. Illustration on how to interface Channel 1 (of the XRT5997 Device) to the Line Ω unbalanced line) (Receiver is Capacitive-coupled to a 75Ω Rev. 1.0.0 33 XRT5997 Rev. 1.0.0 34 XRT5997 Notes Rev. 1.0.0 35 XRT5997 Notes Rev. 1.0.0 36 XRT5997 NOTICE EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a user’s specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for in accuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. Copyright 1999 EXAR Corporation Datasheet September 1999 Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. Rev. 1.0.0 37