DS15BA101_07 NSC | Alldatasheet
Document overview
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Technical content
Features
■ Data rates from DC to 1.5+ Gbps ■ Differential or single-ended input ■ Adjustable output amplitude ■ Single 3.3V supply ■ Industrial -40°C to +85°C temperature ■ Low power: 150 mW (typ) at 1.5 Gbps ■ Space-saving 3 x 3 mm LLP-8 package
Applications
■ Cable extension applications ■ Level translation ■ Signal buffering and repeating ■ Security cameras Typical Application 20199902 © 2007 National Semiconductor Corporation 201999 www.national.com DS15BA101 1.5 Gbps Differential Buffer with Adjustable Output Voltage
Absolute Maximum Ratings (Note 1) Supply Voltage: −0.5V to 3.6V Input Voltage (all inputs) −0.3V to VCC+0.3V Output Current 28 mA Storage Temperature Range −65°C to +150°C Junction Temperature +150°C Lead Temperature (Soldering 4 Sec) +260°C Package Thermal Resistance θJA LLP-8 θJC LLP-8 +90.7°C/W +41.2°C/W ESD Rating (HBM) 5 kV ESD Rating (MM) 250V Recommended Operating Conditions Supply Voltage (VCC – GND): 3.3V ±5% Operating Free Air Temperature (TA) DS15BA101SD −40°C to +85°C Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Notes 2, 3). Symbol Parameter Conditions Reference Min Typ Max Units VICM Input Common Mode Voltage (Note 4) IN+, IN- 0.8 VCC – VID/2 V VID Differential Input Voltage Swing 100 2000 mVP−P VOS Output Common Mode Voltage OUT+, OUT- VCC – VOUT/2 V VOUT Output Voltage Single-ended, 50Ω load RVO = 953Ω 1%, 400 mVP-P Single-ended, 50Ω load RVO = 487Ω 1%, 800 mVP-P ICC Supply Current (Note 5) 45 49 mA Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Note 3). Symbol Parameter Conditions Reference Min Typ Max Units DRMAX Maximum Data Rate (Note 4) IN+, IN- 1.5 2.0 Gbps tLHT Output Low to High Transition Time 20% – 80% (Note 6) OUT+, OUT- 120 220 ps tHLT Output High to Low Transition Time 120 220 ps tPLHD Propagation Low to High Delay (Note 4) 0.95 1.10 1.35 ns tPHLD Propagation High to Low Delay (Note 4) 0.95 1.10 1.35 ns tTJ Total Jitter 1.5 Gbps 26 psP-P Note 1: "Absolute Maximum Ratings" are those parameter values beyond which the life and operation of the device cannot be guaranteed. The stating herein of these maximums shall not be construed to imply that the device can or should be operated at or beyond these values. The table of "Electrical Characteristics" specifies acceptable device operating conditions. Note 2: Current flow into device pins is defined as positive. Current flow out of device pins is defined as negative. All voltages are stated referenced to GND. Note 3: Typical values are stated for VCC = +3.3V and TA = +25°C. Note 4: Specification is guaranteed by characterization. Note 5: Maximum ICC is measured at VCC = +3.465V and TA = +70°C. Note 6: Specification is guaranteed by characterization and verified by test. www.national.com 2 DS15BA101
Order Number DS15BA101SD or DS15BA101SDX See NS Package Number SDA08A Pin Descriptions Pin # Name Description 1 IN+ Non-inverting input pin. 2 IN- Inverting input pin. 3 GND Circuit common (ground reference). 4 RVO Output voltage amplitude control. Connect a resistor to VCC to set output voltage. 5 VCC Positive power supply (+3.3V). 6 GND Circuit common (ground reference). 7 OUT- Non-inverting output pin. 8 OUT+ Inverting output pin. 3 www.national.com DS15BA101
The DS15BA101 accepts either differential or single-ended input. The inputs are self-biased, allowing for simple AC or DC coupling. DC-coupled inputs must be kept within the spec- ified common-mode range. The IN+ and IN- pins are self- biased at approximately 2.1V with VCC = 3.3V. The following three figures illustrate typical DC-coupled interface to com- mon differential drivers. 20199920 Typical LVDS Driver DC-Coupled Interface to DS15BA101 Input 20199921 Typical CML Driver DC-Coupled Interface to DS15BA101 Input 20199922 Typical LVPECL Driver DC-Coupled Interface to DS15BA101 Input www.national.com 4 DS15BA101
The DS15BA101 uses current mode outputs. Single-ended output levels are 400 mVP-P into AC-coupled 100Ω differential cable (with RVO = 953Ω) or into AC-coupled 50Ω coaxial cable (with RVO = 487Ω). Output level is controlled by the value of the RVO resistor connected between the RVO and VCC. The RVO resistor should be placed as close as possible to the RVO pin. In addition, the copper in the plane layers below the RVO network should be removed to minimize parasitic capac- itance. The following figure illustrates typical DC-coupled in- terface to common differential receivers and assumes that the receivers have high impedance inputs. While most receivers have a common mode input range that can accomodate CML signals, it is recommended to check respective receiver's datasheet prior to implementing the suggested interface im- plementation. 20199923 Typical DS15BA101 Output DC-Coupled Interface to an LVDS, CML or LVPECL Receiver 5 www.national.com DS15BA101
CABLE EXTENDER APPLICATION The DS15BA101 together with the DS15EA101 form a cable extender chipset optimized for extending serial data streams from serializer/deserializer (SerDes) pairs and field pro- grammable gate arrays (FPGAs) over 100 Ω differential (i.e. CAT5e/6/7 and twinax) and 50Ω coaxial cables. Setting cor- rect DS15BA101 output amplitude and proper cable termina- tion are keys for optimal operation. The following two figures show recommended chipset configuration for 100Ω differen- tial and 50Ω coaxial cables. 20199905 Cable Extender Chipset Connection Diagram for 100Ω Differential Cables 20199906 Cable Extender Chipset Connection Diagram for 50Ω Coaxial Cables REFERENCE DESIGN There is a complete reference design (P/N: DriveCable02EVK) available for evaluation of the cable extender chipset (DS15BA101 www.national.com 6 DS15BA101
1.5 Gbps Differential DS15BA101 Output
RVO = 953Ω, H:100 ps / DIV, V:100 mV / DIV 20199912
1.5 Gbps Single-ended DS15BA101 Output
RVO = 487Ω, H:100 ps / DIV, V:100 mV / DIV 20199911
2.0 Gbps Differential DS15BA101 Output
RVO = 953Ω, H:100 ps / DIV, V:100 mV / DIV 20199913
2.0 Gbps Single-ended DS15BA101 Output
RVO = 487Ω, H:100 ps / DIV, V:100 mV / DIV 7 www.national.com DS15BA101
Physical Dimensions inches (millimeters) unless otherwise noted 8-Pad LLP Order Number DS15BA101SD or DS15BA101SDX (See AN-1187 for PCB Design and Assembly Recommendations) www.national.com 8 DS15BA101
9 www.national.com DS15BA101
DS15BA101 1.5 Gbps Differential Buffer with Adjustable Output Voltage 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