DS38EP100 NSC | Alldatasheet
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Technical content
Features
■ 1 to 5 Gbps Operation ■ No Power or Ground Required ■ Equalization effective anywhere in data path ■ Equalizes CML, LV-PECL, LVDS signals ■ Symmetric I/O structures provide equal boost for bi- directional operation ■ 7 dB Maximum Boost ■ Code independent, 8b/10b or Scrambled ■ Supports both bi-level and multi-level signaling ■ Extends reach over backplanes and cables ■ Compatible with PCI-Express Gen1 and Gen2 ■ Compatible with XAUI ■ Operates in series with existing active Equalizer ■ Easy to handle 6 pin LLP Simplified Application Diagram 30029201 Note: The DS38EP100 provides the flexibility of passing the data from either side of the device. It can be placed anywhere in the data path.. © 2007 National Semiconductor Corporation 300292 www.national.com DS38EP100 1 to 5 Gbps, Power-Saver Equalizer for Backplanes and Cables
Pin Name Pin Number I/O, Type Description High Speed Differential I/O IOA- IOA+ I/O Symmetric differential I/O. IOB- IOB+ I/O Symmetric differential I/O. NC Exposed Pad 2, 5 DAP N/A Reserved. Do not connect. Note: I = Input / O = Output Pin Diagram 30029205 Bottom View shown 2.2mm x 2.5mm 6-Pin LLP Package Order number DS38EP100 www.national.com 2 DS38EP100
Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. INPUT/OUTPUT (IOA+ and IOB+) or (IOA- and IOB-) +2V (IOA+ and IOA-) or (IOB+ and IOB-) +4V (IOA+ and IOB-) or (IOA- and IOB+) +4V Junction Temperature +150°C Storage Temperature −65°C to +150°C Lead Temperature Soldering, 4 sec +260°C ESD Rating HBM, 1.5 k Ω, 100 pF 1.3kV Recommended Operating Conditions Min Typ Max Units Operating Temperature −40 25 +85 °C Bit Rate 1 5 Gbps Electrical Characteristics (Note 6) Over recommended operating conditions unless other specified. All parameters are guaranteed by test, statistical analysis or design. Symbol Parameter Conditions Min Typ (Note 2) Max Units VIN Input voltage swing See (Note 3) 1000 3600 mVp-p Equalization 2.5 GHz relative to 100MHz 6 dB RLI Differential input return loss 100 MHz – 2.5 GHz, with fixture's effect de- embedded 15 dB RLO Differential output return loss 100 MHz – 2.5 GHz, with fixture's effect de- embedded. IOA+,or IOB+ = static high. 15 dB RIN Input Impedance Differential across IOA+ and IOA-, or IOB+ and IOB-, ZLOAD = 100Ω 100 Ω RO Output Impedance Differential across IOA+ and IOA-, or IOB+ and IOB-, ZSOURCE = 100Ω 100 Ω Through Response Relative to ideal load, see Figure 2 for setup See Figure 3 and Table 1 for limits R1 Resistance IOA+ to IOA- and IOB+ to IOB- No load, high impedance on all ports 150 Ω R2 Resistance IOA+ to IOB+ and IOA- to IOB- No load, high impedance on all ports 50 Ω R3 Resistance IOA+ to IOB- and IOA- to IOB+ No load, high impedance on all ports 150 Ω DC Gain ZLOAD = 100Ω 0.4 (IOA/IOB or IOB/IOA) DJ1 Residual deterministic jitter 2.5 Gbps, 40 in of 6mil microstrip FR4 0.1 UIp-pSee (Note 4) DJ2 Residual deterministic jitter 3.125 Gbps, 40 in of 6mil microstrip FR4 0.1 0.15 UIp-pSee (Notes 4, 5) DJ3 Residual deterministic jitter 3.8 Gbps, 40 in of 6mil microstrip FR4 0.1 0.15 UIp-pSee (Notes 4, 5) DJ4 Residual deterministic jitter 5 Gbps, 30 in of 6mil microstrip FR4 0.1 UIp-pSee (Note 4) 3 www.national.com DS38EP100
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other conditions beyond those indicated in the Recommended Operating Conditions is not implied. The Recommended Operating Conditions indicate conditions at which the device is functional and the device should not be operated beyond such conditions. Note 2: Typical values represent most likely parametric norms, TA = +25 degC, and at the Recommended Operating Conditions at the time of product characterization and are not guaranteed. Note 3: Differential signal to Equalizer, measured at the input to a transmission line, see point A of Figure 1. The transmission line is Z0 = 100Ω, 6-mil, microstrip in FR4 material. Note 4: Deterministic jitter is measured at the differential outputs (point C of Figure 1), minus the deterministic jitter before the test channel (point A of Figure 1). Test pattern: PRBS- 7 . Note 5: Specification is guaranteed by characterization and is not tested in production. Note 6: The Electrical Characteristics tables list guaranteed specifications under the listed Recommended Operating Conditions except as otherwise modified or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and are not guaranteed. www.national.com 4 DS38EP100
TABLE 1. Typical Through Response FIGURE 4. Simplified Block Diagram
Application Information
DS38EP100 DEVICE DESCRIPTION The DS38EP100 Power-Saver equalizer is a passive network circuit composed of resistive, capacitive, and inductive com- ponents (See Figure 4). A differential bridged T-network com- pensates for the transmission medium losses and minimizes medium-induced deterministic jitter with FR4 and cables. The equalizer attenuates low frequency signals and is a bandpass filter at the resonant frequency. The response is linear and symmetric. I/O TERMINATIONS The DS38EP100 I/O impedance is 100 Ω differential. The equalizer is designed for 100 Ω-balanced differential signals and is not intended for single-ended transmission. LINEAR COMPENSATION The unique linear compensation feature of the DS38EP100 combined with the tiny package allows maximum flexibility in placement. The equalizer can be placed anywhere in the data path and will provide the same compensation at the receiving circuit. (See Simplified Application Diagram) SYMMETRIC I/O STRUCTURES The symmetry of the passive equalization network allows bi- directional operation. Signals receive equal compensation regardless of the direction of data flow. (See Figure 4). PCB LAYOUT CONSIDERATIONS FOR DIFFERENTIAL PAIRS AND NO CONNECT PADS The differential I/Os must have a controlled differential impedance of 100 Ω. It is preferable to route all differential lines exclusively on one layer of the board. The use of vias should be avoided if possible. If vias must be used, they should be used sparingly and must be placed symmetrically for each side of a given differential pair. Differential signals should be routed away from other signals and noise sources on the printed circuit board. Pin 2, Pin 5, and the center DAP have to be left as a no connect. Therefore, do not connect the landing pads of these pins to the power or ground plane. See AN-1187 for additional information on the LLP package. 7 www.national.com DS38EP100
Typical Performance Characteristics 30029207 Residual Deterministic Jitter vs. FR4 Length 30029208 Residual Deterministic Jitter vs. FR4 Length 30029209 Eye Height vs. FR4 Length 30029210 Eye Height vs. FR4 Length www.national.com 8 DS38EP100
Physical Dimensions inches (millimeters) unless otherwise noted Order number DS38EP100 See NS Package SDB06A 15 www.national.com DS38EP100
DS38EP100 1 to 5 Gbps, Power-Saver Equalizer for Backplanes and Cables THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS, IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. TESTING AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT NATIONAL DEEMS NECESSARY TO SUPPORT NATIONAL’S PRODUCT WARRANTY. EXCEPT WHERE MANDATED BY GOVERNMENT REQUIREMENTS, TESTING OF ALL PARAMETERS OF EACH PRODUCT IS NOT NECESSARILY PERFORMED. NATIONAL ASSUMES NO LIABILITY FOR APPLICATIONS ASSISTANCE OR BUYER PRODUCT DESIGN. BUYERS ARE RESPONSIBLE FOR THEIR PRODUCTS AND APPLICATIONS USING NATIONAL COMPONENTS. PRIOR TO USING OR DISTRIBUTING ANY PRODUCTS THAT INCLUDE NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING AND OPERATING SAFEGUARDS. EXCEPT AS PROVIDED IN NATIONAL’S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, NATIONAL ASSUMES NO LIABILITY WHATSOEVER, AND NATIONAL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE SALE AND/OR USE OF NATIONAL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: Life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a significant injury to the user. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system or to affect its safety or effectiveness. National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. Copyright© 2007 National Semiconductor Corporation For the most current product information visit us at www.national.com National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 National Semiconductor Europe Customer Support Center Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +49 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Support Center Email: ap.support@nsc.com National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: jpn.feedback@nsc.com Tel: 81-3-5639-7560 www.national.com