June 2007 LMH0302 3Gbps HD/SD SDI Cable Driver General Description Features 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. ■ 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 Industrial temperature range: −40°C to +85°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 3Gbps HD/SD SDI Cable Driver PRELIMINARY LMH0302 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 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 4kV 250V Recommended Operating Conditions Supply Voltage (VCC – VEE): Operating Free Air Temperature (TA) +260°C 3.3V ±5% −40°C to +85°C +64°C/W +26°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 VIH Input Voltage High Level VIL InputVoltage Low Level ICC Supply Current Conditions Reference SDI, SDI Differential Min Typ 1.6 + VSDI/2 100 SDO, SDO Single-ended, 75Ω load, RREF = 750Ω 1% Units V 2200 mVP−P VCC – VSDO 720 SD/HD, ENABLE Max VCC – VSDI/2 800 V 880 2.0 mVP-P V 0.8 V SD/HD = 0, SDO/SDO enabled 49 53 mA SD/HD = 0, SDO/SDO disabled 23 27 mA SD/HD = 1, SDO/SDO enabled 39 42 mA SD/HD = 1, SDO/SDO disabled 14 16 mA Typ Max Units 2970 Mbps AC Electrical Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Note 3). Symbol Parameter DRSDI Input Data Rate tjit Additive Jitter tr,tf Output Rise Time, Fall Time Conditions Reference Min SDI, SDI 2.97 Gbps SDO, SDO 20 psP-P 1.485 Gbps 18 psP-P 270 Mbps 15 SD/HD = 0, 20% – 80%, 90 ps 800 ps 30 ps SD/HD = 0, 2.97 Gbps, (Note 4) 27 ps SD/HD = 0, 1.485 Gbps, (Note 4) 30 ps SD/HD = 1, (Note 4) 100 ps SD/HD = 0, (Note 4) 10 % SD/HD = 1, (Note 4) 8 % SD/HD = 1, 20% – 80% 400 Mismatch in Rise/Fall Time Duty Cycle Distortion tOS RLSDO Output Overshoot Output Return Loss www.national.com psP-P 130 5 MHz - 1.5 GHz, (Note 5) 15 dB 1.5 GHz - 3.0 GHz, (Note 5) 10 dB 2 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 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. 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 # Name Description 1 SDI Serial data true input. 2 SDI Serial data complement input. 3 VEE Negative power supply (ground). 4 RREF Output driver level control. Connect a resistor to VCC to set output voltage swing. 5 NC No connect. Not bonded internally. 6 ENABLE Output driver enable. When low, the SDO/SDO output driver is powered off. ENABLE has an internal pulllup. 7 NC No connect. Not bonded internally. 8 NC No connect. Not bonded internally. 9 VCC Positive power supply (+3.3V). 10 SD/HD Output slew rate control. Output rise/fall time complies with SMPTE 424M / 292M when low and SMPTE 259M when high. 11 SDO Serial data complement output. 12 SDO Serial data true output. 13 NC No connect. Not bonded internally. 14 NC No connect. Not bonded internally. 15 NC No connect. Not bonded internally. 16 NC No connect. Not bonded internally. DAP VEE Connect exposed DAP to negative power supply (ground). www.national.com 4 the RREF network should be removed to minimize parasitic capacitance. 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 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 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 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 Device Operation 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. 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