LMH0002 SMPTE 292M / 259M Serial Digital Cable Driver General Description Features The LMH0002 SMPTE 292M / 259M serial digital cable driver is a monolithic, high-speed cable driver designed for use in SMPTE 292M / 259M serial digital video and ITU-T G.703 serial digital data transmission applications. The LMH0002 drives 75Ω transmission lines (Belden 8281, Belden 1694A or equivalent) at data rates up to 1.485 Gbps. The LMH0002 provides two selectable slew rates for SMPTE 259M and SMPTE 292M compliance. The output voltage swing is adjustable via a single external resistor. The LMH0002 is powered from a single 3.3V supply. Power consumption is typically 125 mW in SD mode and 149 mW in HD mode. The LMH0002 is available in an 8-pin SOIC or 16pin LLP package. ■ SMPTE 292M, SMPTE 344M and SMPTE 259M ■ ■ ■ ■ ■ ■ ■ ■ compliant Supports DVB-ASI at 270 Mbps Data rates to 1.485 Gbps Differential input 75Ω differential output Selectable slew rate Adjustable output amplitude Single 3.3V supply operation Operating temperature range: Commercial 0°C to +70°C (LMH0002MA) or Industrial −40°C to +85°C (LMH0002TMA and LMH0002SQ) ■ Typical power consumption: 125 mW in SD mode and 149 mW in HD mode ■ 8–pin SOIC or 16–pin LLP package ■ Replaces the GS1528, GS1528A, or GS1578A. Applications ■ SMPTE 292M, SMPTE 344M, and SMPTE 259M serial ■ ■ ■ ■ ■ ■ digital interfaces Sonet/SDH and ATM interfaces Digital routers and switches Distribution amplifiers Buffer applications Set top boxes Security cameras Typical Application 20176102 © 2008 National Semiconductor Corporation 201761 www.national.com LMH0002 SMPTE 292M / 259M Serial Digital Cable Driver August 1, 2008 LMH0002 ESD Rating (HBM) ESD Rating (MM) 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 8-pin SOIC θJA 16-pin LLP θJC 8-pin SOIC θJC 16-pin LLP −0.5V to 3.6V −0.3V to VCC+0.3V 28 mA −65°C to +150°C +150°C 5kV 250V Recommended Operating Conditions Supply Voltage (VCC – VEE): Operating Free Air Temperature (TA) LMH0002MA LMH0002TMA, LMH0002SQ +260°C 3.3V ±5% 0°C to +70°C −40°C to +85°C +160°C/W +78.9°C/W +105°C/W +42.7°C/W DC Electrical Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Notes 2, 3). Symbol Parameter VCMIN Input Common Mode Voltage VSDI Input Voltage Swing VCMOUT Output Common Mode Voltage VSDO Output Voltage Swing Conditions Reference SDI, SDI Differential Typ 1.6 + VSDI/2 100 SDO, SDO Single-ended, 75Ω load,RREF = 750Ω 1% Single-ended, 75Ω load,RREF = 590Ω 1% SD/HD Input Voltage Min Min for SD SD/HD V 2000 mVP−P V 750 800 850 mVP-P 900 1000 1100 mVP-P 2.4 V 0.8 SD/HD Input Current Supply Current Units VCC – VSDO Max for HD ICC Max VCC – VSDI/2 3.7 V µA SD/HD = 0, (Note 5) 45 49 mA SD/HD = 1, (Note 5) 38 43 mA Typ Max Units 1485 Mbps AC Electrical Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Note 3). Symbol Parameter Conditions Reference DRSDI Input Data Rate (Note 4) SDI, SDI tjit Additive Jitter 1.485 Gbps SDO, SDO tr,tf Output Rise Time, Fall Time Min 26 psP-P 270 Mbps 18 psP-P SD/HD = 0, 20% – 80%, (Note 6) 120 220 ps 560 800 ps SD/HD = 1, 20% – 80% 400 Mismatch in Rise/Fall Time (Note 4) 30 ps Duty Cycle Distortion SD/HD = 0, (Note 4) 30 ps SD/HD = 1, (Note 4) 100 ps tOS Output Overshoot (Note 4) RLSDO Output Return Loss (Note 7) 8 15 20 % dB 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. www.national.com 2 Note 6: Specification is guaranteed by characterization and verified by test. Note 7: Output return loss is dependent on board design. The LMH0002 meets this specification on the SD002 evaluation board from 5MHz to 1.5GHz. Connection Diagrams 20176101 8-Pin SOIC Order Number LMH0002MA or LMH0002TMA See NS Package Number M08A 20176105 16-Pin LLP Order Number LMH0002SQ See NS Package Number SQB16A Pin Descriptions SOIC Pin # LLP Pin # 1 1 SDI Serial data true input. 2 2 SDI Serial data complement input. 3 3 VEE Negative power supply (ground). 4 4 RREF Output driver level control. Connect a resistor to VCC to set output voltage swing. 5 9 VCC Positive power supply (+3.3V). 6 10 SD/HD Output slew rate control. Output rise/fall time complies with SMPTE 292M when low and SMPTE 259M when high. 7 11 SDO Serial data complement output. 12 SDO Serial data true output. 8 — — Name 5, 6, 7, 8, NC 13, 14, 15, 16 DAP VEE Description No connect. Connect exposed DAP to negative power supply (ground). 3 www.national.com LMH0002 Note 5: Maximum ICC is measured at VCC = +3.465V and TA = +70°C. LMH0002 OUTPUT INTERFACING The LMH0002 uses current mode outputs. Single-ended output levels are 800 mVP-P into 75Ω AC-coupled coaxial cable (with RREF = 750Ω). Output level is controlled by the value of the RREF resistor connected between the RREF pin and VCC. 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. Device Operation INPUT INTERFACING The LMH0002 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. SDI and SDI are self-biased at approximately 2.1V with VCC = 3.3V. Figure 1 shows the differential input stage for SDI and SDI. OUTPUT SLEW RATE CONTROL The LMH0002 output rise and fall times are selectable for either SMPTE 259M or SMPTE 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 292M compliance, SD/HD is set low. REPLACING THE GENNUM GS1528, GS1528A, and GS1578A The LMH0002MA is form-fit-function compatible with the Gennum GS1528 and GS1528A. The LMH0002SQ is formfit-function compatible with the Gennum GS1578A. 20176104 FIGURE 1. Differential Input Stage for SDI and SDI. www.national.com 4 LMH0002 Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin SOIC Order Number LMH0002MA or LMH0002TMA NS Package Number M08A 16-Pin LLP Order Number LMH0002SQ NS Package Number SQB16A 5 www.national.com LMH0002 SMPTE 292M / 259M Serial Digital Cable Driver Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Design Support Amplifiers www.national.com/amplifiers WEBENCH www.national.com/webench Audio www.national.com/audio Analog University www.national.com/AU Clock Conditioners www.national.com/timing App Notes www.national.com/appnotes Data Converters www.national.com/adc Distributors www.national.com/contacts Displays www.national.com/displays Green Compliance www.national.com/quality/green Ethernet www.national.com/ethernet Packaging www.national.com/packaging Interface www.national.com/interface Quality and Reliability www.national.com/quality LVDS www.national.com/lvds Reference Designs www.national.com/refdesigns Power Management www.national.com/power Feedback www.national.com/feedback Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www.national.com/led PowerWise www.national.com/powerwise Serial Digital Interface (SDI) www.national.com/sdi Temperature Sensors www.national.com/tempsensors Wireless (PLL/VCO) www.national.com/wireless THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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