 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
SP505RB Datasheet(PDF) 11 Page - Sipex Corporation |
|
||||||||||||||||||||||||||||||
SP505RB Datasheet(HTML) 11 Page - Sipex Corporation |
|
|
11 / 30 page  11 SP505/6/7APN/03 SP505, SP506, SP507 Application Note © Copyright 2000 Sipex Corporation SP506 and SP507 Drive Capability According to the ITU-T V.11 standard, the maximum cable length for a differential V.11 transmission is 4,000 feet (~1,000 meters). However, the standard also illustrates a derating graph of data rate versus cable length. So actually in a real application, the system would not be able to transmit 10Mbps over the full 4,000 feet of Category 3 or similar type cable. As cable parasitics add up over longer cable lengths, capacitance and other affects will degrade the signal, especially at higher frequencies. The signal integrity depends mainly on the driver output strength or "drivability" and parasitic capacitance on the cable. RS-232 cabling is typically 50pF per foot, where as a good twisted pair type cable for X.21, RS-449, EIA-530, or V.35 will typically be 10pF per foot or less. Some better quality cables will have 3-5pF per foot. Using a typical setup with a TTC Fireberd 6000A Bit Error Rate Tester (BERT) connected with our SP507 evaluation board as configured in Figure 8 below, the driver output performance was characterized over various cable lengths. The 6000A BERT emulated the DCE, which provided the TXC clock pulse from 1.544Mbps to 12Mbps. The clock waveform was propagated through the serial cable to the SP507 evaluation board, which was configured as the DTE. The clock signal was then "echoed" through the TxCE (Transmit Clock Echo) driver across the cable and back the BERT. The clock signal input to the TxCE driver (CH3) and the differential driver output are measured with a oscilloscope to observe driver waveform integrity. The differential driver output was measured at the other end of the cable (M1 = A - B), as if the receiver would view the incoming signal. The data stream was generated by the DCE and was propagated through the SP507's RxC receiver and TxCE driver. The BERT also records the number of bit errors occurring during the infinite 1:1 data bit stream that is sent back through the cable. Figure 8. SP507 Cable Length Versus Throughput Circuit Configuration 22 µF22µF 22 µF 27 26 30 28 31 32 MBRS140T3 VCC VDD C1- C2- VSS C1+ C2+ 22 µF 61 59 SP507CF TxD 14 58 56 DTR 13 54 52 RTS 16 63 65 TxCE 15 42 44 ST 22 47 45 RL 17 51 49 LL 24 70 71 RxD 1 37 38 RxC 20 66 67 CTS 80 68 69 DSR 78 35 36 DCD 19 39 40 TM 21 76 77 SCT 79 10 µF M0 M1 M2 10 11 12 STEN RREN RTEN Various GND pins (Refer to SP507 Datasheet) TMEN SCTEN LLEN RLEN TTEN 2 3 7 4 5 18 6 23 +5V LATCH 8 GND +5V +5V Fireberd 6000A Network/BER Tester TxD RxD DTR DSR CTS DCE (emulated) DTE (Evaluation Board) CH3 M1 RTS RxC DCD TxC TxC Notes: V.35 Mode selected. Open Driver Inputs are default as HIGH. “1” “0” “0” Signal GND |
Similar Part No. - SP505RB |
|
Similar Description - SP505RB |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
