 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| Low Voltage Differential Signaling (LVDS) Evaluation Module (EVM) User's Guide 2000 Mixed Signal Products SLLU016 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof. Copyright (c) 2000, Texas Instruments Incorporated Contents Contents 1 The Evaluation Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.1 The Evaluation Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.1 Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Point-to-Point Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3.1 Point-to-Point Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 Multidrop Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 4.1 Multidrop Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 The Application of TIA/EIA-422 Data to an LVDS Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 5.1 The Application of TIA/EIA-422 Data to an LVDS Receiver . . . . . . . . . . . . . . . . . . . . . . . 5-2 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 6.1 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2 2 3 4 5 6 Figures 2-1 3-1 4-1 5-1 The EVM Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Point-to-Point Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Multidrop Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TIA/EIA-422 Data to an LVDS Receiver Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 3-2 4-2 5-2 Tables 2-1 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 iii iv Chapter 1 The Evaluation Board The TI low voltage differential signaling (LVDS) evaluation module (EVM) is designed for the analysis of low-voltage differential signaling with the SN65LVDS31 and SN65LVDS32 quad drivers and receivers. Not only is the EVM designed for the implementation of point-to-point or multidrop transmission, but it can also be configured for the application of TIA/EIA-422 data to an LVDS receiver. Topic 1.1 Page The Evaluation Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 The Evaluation Board 1-1 The Evaluation Board 1.1 The Evaluation Board The EVM is designed with the driver section on the top half of the board and the receiver section on the bottom half. While the SN65LVDS31 driver (U1) occupies the driver section, any of three TI LVDS quad receivers (U2) sharing the same footprint may be analyzed. These include the SN65LVDS32 original receiver, the SN65LVDS32A with enhanced common mode range, and the SN65LVDT32A, which provides internal termination with the enhanced common mode range. All three are available for this application. The driver and the three receivers mentioned are four-channel devices with the same enabling scheme. There are two observations to make about the EVM. First, if the internally terminated receiver is used (SN65LVDT32A), the onboard 100- termination resistors R5, R6, R7, and R10 must be removed. Second, jumpers J5 and J6 allow the devices to either share the same power and ground source or be powered separately for independent device analysis. 1-2 Chapter 2 Equipment Required This chapter provides a list of equipment required for the analysis of lowvoltage differential signaling. It also provides a schematic diagram and parts list. Topic 2.1 Page Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Equipment Required 2-1 Equipment Required 2.1 Equipment Required - 3.3-VDC power supply - A transmission medium from the driver to the receiver (cable or wire) - A function generator capable of supplying TTL level signaling rates of up to 400 Mbps. Note: 50 source impedance. - A high bandwidth oscilloscope, preferably in the 4-GHz range. 2-2 Equipment Required Figure 2-1. The EVM Schematic Diagram VCC1 P17-1 (3.3 VDC IN) P4 GND 1 R4 51.1 3 2 1 J1 3 2 1 J2 C1 10 F R1 51.1 1 2 3 4 5 6 7 8 U1 16 1A VCC 15 1Y 4A 14 4Y 1Z 13 G 4Z 12 G 2Z 11 3Z 2Y 3Y 10 2A 9 GND 3A SN65LVDS31 P18-1 (DC GND) P2 GND 1 R2 51.1 C3 0.01 F C4 0.01 F J5 12 P4 GND 1 P5 1 2 1 P11 2 1 P9 2 J6 12 P7 1 2 P3 GND 1 R3 51.1 VCC2 3 2 1 J3 3 2 1 J4 C2 10 F C5 0.01 F R9 P6 P13 1 2 1 2 R5 100 1 2 3 4 5 6 7 8 1B VCC 1A 4B 4A 1Y G 4Y G 2Y 3Y 2A 3A 2B GND 3B 16 15 14 13 12 11 10 9 R10 100 P19-1 (3.3 VDC IN) C6 0.01 F R8 1 P12 2 1 P16 2 P14 1 2 P8 1 2 R6 100 1 P15 2 R7 100 1 2 P10 SN65LVDS32 P20-1 (DC GND) Equipment Required 2-3 Equipment Required Table 2-1. Parts List Quantity 2 4 4 2 4 8 4 4 4 3 2 1 1 1 Reference Des. C1, C2 C3-C6 J1-J4 J5, J6 P1-P4 P5-P12 P13-P16 P17-P20 R1-R4 R5-R7 R8-R9 R10 U1 U2 Description Capacitor, 10.0 F, tantalum Capacitor, 0.01 F 3-Position male post with shorting jumpers 2-Position male post with shorting jumpers Connectors, SMA, edgemount 2-Position female post, SIP 2-Position male post Banana jack connectors, female Resistors, 51 Resistors, 100 Resistors, 0 (optional: 45.3 ) Resistors, 100 (optional: 10.22 ) SN65LVDS31 SN65LVDS32, SN65LVDS32A, or SN65LVDT32A 2-4 Chapter 3 Point-to-Point Transmission This chapter shows the setup for point-to-point transmission. Topic 3.1 Page Point-to-Point Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 Point-to-Point Transmission 3-1 Point-to-Point Transmission 3.1 Point-to-Point Transmission The point-to-point configuration with one driver transmitting to one receiver is a typical transmission scheme. The transmission quality is superior, since there are no stubs and few discontinuities on the bus to degrade the signal. Again note that the required 100- termination resistor (R5) is already in place across the differential pair at the input of the receiver (U2). Figure 3-1. Point-to-Point Schematic Diagram Cable U1 1 1A GND R1 51.1 D 1Y 2 1Z 3 P5 P6 1 2 2 1 R5 100 2 1A 1 1B 1Y 3 1 2 U2 P1 P13 SN65LVDS31 SN65LVDS32 3-2 Chapter 4 Multidrop Transmission This chapter shows the setup for multidrop transmission. Topic 4.1 Page Multidrop Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 Multidrop Transmission 4-1 Multidrop Transmission 4.1 Multidrop Transmission The multidrop configuration with one driver transmitting to several receivers may be implemented as shown in Figure 4-1. In this application, only a single 100- termination resistor is required across the differential pair at the inputs of the last receiver. Termination resistors at the inputs of the middle receivers in the configuration must be removed. To minimize reflections, line length between receivers should be kept as short as possible. Stub length should also be kept to a minimum. On the EVM, stub length is approximately 3 cm. For a complete discussion of this configuration with up to 36 receivers, consult the TI application note, LVDS Multidrop Connections, literature number SLLA054. Figure 4-1. Multidrop Schematic Diagram Cable U1 1 1A GND R1 51.1 D 1Y 2 1Z 3 P5 1 2 1 2 2 1 U2 R5 100 P6 R6 100 P8 1 2 P1 2 1A 1 1B 1Y 3 1 2 P13 6 2A 7 2B 2Y 5 SN65LVDS31 1 2 P14 R7 100 P10 10 3A 9 3B 3Y 11 1 2 P15 R8 2 1 0 R8 P12 0 14 4A R10 100 15 4B 4Y 13 1 2 P16 SN65LVDS32 NOTE: Termination resistors R5, R6, and R7 must be removed. 4-2 Chapter 5 The Application of TIA/EIA-422 Data to an LVDS Receiver This chapter explains the application of TIA/EIA-422 data into an LVDS receiver. Topic 5.1 Page The Application of TIA/EIA-422 Data to an LVDS Receiver . . . . . . . . 5-2 The Application of TIA/EIA-422 Data to an LVDS Receiver 5-1 The Application of TIA/EIA-422 Data to an LVDS Receiver 5.1 The Application of TIA/EIA-422 Data to an LVDS Receiver The fourth channel of the receiver (4A and 4B) configured with the resistor divider network of R8, R9, and R10 may be used for the evaluation of TIA/ EIA-422 data applied to an LVDS receiver. TIA/EIA-422 signaling voltage levels are adjusted to appropriate LVDS input voltage levels by installing 45- resistors in the spaces provided for R8 and R9 on the evaluation board. The 100- resistor (R10) must then be removed and replaced with a 10- resistor as shown in Figure 5-1. This resistor divider network now comprises a total differential load of 100 to match the characteristic impedance of a common transmission line, and reduces the TIA/EIA-422 maximum differential signal amplitude from 6 V to an appropriate 600 mV. Figure 5-1. TIA/EIA-422 Data to an LVDS Receiver Schematic U2 R8 2 1 45.3 R9 45.3 14 4A R10 15 4B 10.2 4Y 13 1 2 P16 P12 SN65LVDS32 5-2 Chapter 6 References This chapter contains a list of LVDS literature available. Topic 6.1 Page References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2 References 6-1 References 6.1 References There is a wide selection of the LVDS devices and related applications materials available to assist in the design and development of LVDS interfaces. This information is located at http://www.ti.com/sc/datatran. Input LVDS into the search tool or enter the part number of a specific device to obtain additional information. 1) LVDS Designer's Notes (SLLA014) 2) Reducing EMI With Low Voltage Differential Signaling (SLLA030) 3) Measuring Crosstalk in LVDS Systems (SLLA064) 4) 1998 Data Transmission Data Book (SLLD001B) 5) Performance of LVDS With Different Cables (SLLA053) 6) LVDS Multidrop Connections (SLLA054) 6-2 |
Price & Availability of SLLU016
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |