Description
LMH0302 3Gbps HD/SD SDI Cable Driver PRELIMINARY April 2007 LMH0302 3Gbps HD/SD SDI Cable Driver General Description The LMH0302 3Gbps HD/SD SDI Cable Driver is designed for use in SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE 259M serial digital video applications. The LMH0302 drives 75Ω transmission lines (Belden 1694A, Belden 8281, or equivalent) at data rates up to 2.97 Gbps. The LMH0302 provides two selectable slew rates for SMPTE 259M and SMPTE 424M / 292M compliance. The output driver may be powered down via the output diver enable pin. The LMH0302 is powered from a single 3.3V supply. Power consumption is typically 129 mW in SD mode and 162 mW in HD mode. The LMH0302 is available in a 16-pin LLP package. Features ■ SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE ■ ■ ■ ■ ■ ■ ■ ■ 259M compliant Data rates to 2.97 Gbps Differential input 75Ω differential output Selectable slew rate Output driver power down control Single 3.3V supply operation Commercial operating temperature range: 0°C to +70°C Typical power consumption: 129 mW in SD mode and 162 mW in HD mode ■ 16–pin LLP package ■ Footprint compatible with the LMH0002SQ ■ Replaces the Gennum GS2978 Applications ■ SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE 259M serial digital interfaces ■ Digital video routers and switches ■ Distribution amplifiers Typical Application 20214602 © 2007 National Semiconductor Corporation 202146 www.national.com LMH0302 Absolute Maximum Ratings (Note 1) Supply Voltage: Input Voltage (all inputs) Output Current Storage Temperature Range Junction Temperature Lead Temperature (Soldering 4 Sec) Package Thermal Resistance  θJA 16-pin LLP  θJC 16-pin LLP −0.5V to 3.6V −0.3V to VCC+0.3V 28mA −65°C to +150°C +150°C +260°C +64°C/W +26°C/W ESD Rating (HBM) ESD Rating (MM) 4kV 250V Recommended Operating Conditions Supply Voltage (VCC – VEE): Operating Free Air Temperature (TA) 3.3V ±5% 0°C to +70°C DC Electrical Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Notes 2, 3). Symbol Parameter VCMIN VSDI VCMOUT VSDO VIH VIL ICC Input Common Mode Voltage Input Voltage Swing Output Common Mode Voltage Output Voltage Swing Input Voltage High Level InputVoltage Low Level Supply Current SD/HD = 0, SDO/SDO enabled SD/HD = 0, SDO/SDO disabled SD/HD = 1, SDO/SDO enabled SD/HD = 1, SDO/SDO disabled Single-ended, 75Ω load, RREF = 750Ω 1% SD/HD, ENABLE Differential SDO, SDO Conditions Reference SDI, SDI Min 1.6 + VSDI/2 100 VCC – VSDO 720 2.0 0.8 49 23 39 14 53 27 42 16 800 880 Typ Max VCC – VSDI/2 2200 Units V mVP−P V mVP-P V V mA mA mA mA AC Electrical Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Note 3). Symbol Parameter DRSDI tjit Input Data Rate Additive Jitter 2.97 Gbps 1.485 Gbps 270 Mbps tr,tf Output Rise Time, Fall Time Mismatch in Rise/Fall Time Duty Cycle Distortion SD/HD = 0, 2.97 Gbps, (Note 4) SD/HD = 0, 1.485 Gbps, (Note 4) SD/HD = 1, (Note 4) tOS RLSDO Output Overshoot Output Return Loss SD/HD = 0, (Note 4) SD/HD = 1, (Note 4) 5 MHz - 1.5 GHz, (Note 5) 1.5 GHz - 3.0 GHz, (Note 5) 15 10 SD/HD = 0, 20% – 80%, SD/HD = 1, 20% – 80% 400 Conditions Reference SDI, SDI SDO, SDO 20 18 15 90 130 800 30 27 30 100 10 8 Min Typ Max 2970 Units Mbps psP-P psP-P psP-P ps ps ps ps ps ps % % dB dB www.national.com 2 LMH0302 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 VEE = 0 Volts. Note 3: Typical values are stated for VCC = +3.3V and TA = +25°C. Note 4: Specification is guaranteed by characterization. Note 5: Output return loss is dependent on board design. The LMH0302 meets this specification on the SD302 evaluation board. 3 www.national.com LMH0302 Connection Diagram 20214605 The exposed die attach pad is a negative electrical terminal for this device. It should be connected to the negative power supply voltage. 16-Pin LLP Order Number LMH0302SQ See NS Package Number SQB16A Pin Descriptions LLP Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 DAP SDI SDI VEE RREF NC ENABLE NC NC VCC SD/HD SDO SDO NC NC NC NC VEE Name Description Serial data true input. Serial data complement input. Negative power supply (ground). Output driver level control. Connect a resistor to VCC to set output voltage swing. No connect. Not bonded internally. Output driver enable. When low, the SDO/SDO output driver is powered off. ENABLE has an internal pulllup. No connect. Not bonded internally. No connect. Not bonded internally. Positive power supply (+3.3V). Output slew rate control. Output rise/fall time complies with SMPTE 424M / 292M when low and SMPTE 259M when high. Serial data complement output. Serial data true output. No connect. Not bonded internally. No connect. Not bonded internally. No connect. Not bonded internally. No connect. Not bonded internally. Connect exposed DAP to negative power supply (ground). www.national.com 4 LMH0302 Device Operation INPUT INTERFACING The LMH0302 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 specified common-mode range. OUTPUT INTERFACING The LMH0302 uses current mode outputs. Single-ended output levels are 800 mVP-P into 75Ω AC-coupled coaxial cable with an RREF resistor of 750Ω. The RREF resistor is connected between the RREF pin and VCC. The only resistor value that should be used for RREF is 750Ω.. The RREF resistor should be placed as close as possible to the RREF pin. In addition, the copper in the plane layers below the RREF network should be removed to minimize parasitic capacitance. OUTPUT SLEW RATE CONTROL The LMH0302 output rise and fall times are selectable for either SMPTE 259M or SMPTE 424M / 292M compliance via the SD/HD pin. For slower rise and fall times, or SMPTE 259M compliance, SD/HD is set high. For faster rise and fall times, or SMPTE 424M and SMPTE 292M compliance, SD/HD is set low. OUTPUT ENABLE The SDO/SDO output driver can be enabled or disabled with the ENABLE pin. When set low, the output driver is powered off. ENABLE has an internal pullup. 5 www.national.com LMH0302 Physical Dimensions inches (millimeters) unless otherwise noted 16-Pin LLP Order Number LMH0302SQ NS Package Number SQB16A www.national.com 6 LMH0302 Notes 7 www.national.com LMH0302 3Gbps HD/SD SDI Cable Driver Notes 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 Fax: +49 (0) 180-530-85-86 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 Semiconduct

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