LMH0002

LMH0002 SMPTE 292M / 259M Serial Digital Cable Driver January 2006 LMH0002 SMPTE 292M / 259M Serial Digital Cable Driver General Description 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 125mW in SD mode and 149mW in HD mode. Features n SMPTE 292M, SMPTE 344M and SMPTE 259M compliant n Data rates to 1.485 Gbps n Differential input n 75Ω differential output n Selectable slew rate n Adjustable output amplitude n Single 3.3V supply operation n Operating temperature range: Commercial 0˚C to +70˚C (LMH0002MA) or Industrial −40˚C to +85˚C (LMH0002TMA) n Typical power consumption: 125mW in SD mode and 149mW in HD mode n Replaces the GS1528 and GS1528A Applications n SMPTE 292M, SMPTE 344M, and SMPTE 259M serial digital interfaces n Sonet/SDH and ATM interfaces n Digital routers and switches n Distribution amplifiers n Buffer applications n Set top boxes n Security cameras Typical Application 20176102 © 2006 National Semiconductor Corporation DS201761 www.national.com LMH0002 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 θJC 8-pin SOIC −0.5V to 3.6V −0.3V to VCC+0.3V 28mA −65˚C to +150˚C +150˚C +260˚C +125˚C/W +105˚C/W ESD Rating (HBM) ESD Rating (MM) 5kV 250V Recommended Operating Conditions Supply Voltage (VCC – VEE): Operating Free Air Temperature (TA) LMH0002MA LMH0002TMA 3.3V ± 5% 0˚C to +70˚C −40˚C to +85˚C DC Electrical Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Notes 2, 3). Symbol Parameter VCMIN VSDI Input Common Mode Voltage Input Voltage Swing Differential SDO, SDO Single-ended, 75Ω load, RREF = 750Ω 1% Single-ended, 75Ω load, RREF = 590Ω 1% SD/HD Input Voltage SD/HD Input Current ICC Supply Current SD/HD = 0, (Note 5) SD/HD = 1, (Note 5) Min for SD Max for HD 3.7 45 38 49 43 SD/HD Conditions Reference SDI, SDI Min 1.6 + VSDI/2 100 VCC – VSDO 750 900 2.4 0.8 800 1000 850 1100 Typ Max VCC – VSDI/2 2000 Units V mVP−P V mVP-P mVP-P V V µA mA mA VCMOUT Output Common Mode Voltage VSDO Output Voltage Swing AC Electrical Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Note 3). Symbol Parameter DRSDI tjit tr,tf Input Data Rate Additive Jitter Output Rise Time, Fall Time Conditions (Note 4) 1.485 Gbps 270 Mbps SD/HD = 0, 20% – 80%, (Note 6) SD/HD = 1, 20% – 80% Mismatch in Rise/Fall Time tOS RLSDO Output Overshoot Output Return Loss (Note 4) (Note 4) (Note 7) 15 20 400 Reference SDI, SDI SDO, SDO 26 18 120 560 220 800 30 8 Min Typ Max 1485 Units Mbps psP-P psP-P ps ps ps % 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. 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. 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. www.national.com 2 LMH0002 Connection Diagram 20176101 8-Pin SOIC Order Number LMH0002MA or LMH0002TMA See NS Package Number M08A Pin Descriptions Pin # 1 2 3 4 5 6 7 8 SDI SDI VEE RREF VCC SD/HD SDO SDO 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. Positive power supply (+3.3V). Output slew rate control. Output rise/fall time complies with SMPTE 292M when low and SMPTE 259M when high. Serial data complement output. Serial data true output. 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. 20176104 FIGURE 1. Differential Input Stage for SDI and SDI. 3 www.national.com LMH0002 Device Operation OUTPUT INTERFACING (Continued) OUTPUT SLEW RATE CONTROL The LMH0002 output rise and fall times are selectable for either SMPTE 259M or SMPTE 292M compliance via pin 6, SD/HD. 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 The LMH0002 is form-fit-function compatible with the Gennum GS1528 and GS1528A. 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 pin 4 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. www.national.com 4 LMH0002 SMPTE 292M / 259M Serial Digital Cable Driver Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin SOIC Order Number LMH0002MA or LMH0002TMA NS Package Number M08A National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information visit us at www.national.com. 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