LMH0202MT

LMH0202 Dual SMPTE 292M / 259M Serial Digital Cable Driver June 2006 LMH0202 Dual SMPTE 292M / 259M Serial Digital Cable Driver General Description The LMH0202 Dual 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 LMH0202 drives 75Ω transmission lines (Belden 8281, Belden 1694A or equivalent) at data rates up to 1.485 Gbps. The LMH0202 provides two selectable slew rates for SMPTE 259M and SMPTE 292M compliance. The output voltage swing is adjustable via a single external resistor. The LMH0202 offers the flexibility to implement either dual differential inputs or a single differential input (externally routed via PCB) to dual differential outputs. The latter option provides an ideal solution for DVB-ASI applications where only the non-inverted outputs are typically used. The LMH0202 is powered from a single 3.3V supply. Power consumption is typically 250mW in SD mode and 298mW in HD mode. Features n SMPTE 292M, SMPTE 344M and SMPTE 259M compliant n Data rates to 1.485 Gbps n Dual differential inputs n Dual 75Ω differential outputs n Two selectable slew rates n Adjustable output amplitude n Single 3.3V supply operation n Commercial temperature range: 0˚C to +70˚C n Typical power consumption: 250mW in SD mode and 298mW in HD mode Applications n SMPTE 292M, SMPTE 344M, and SMPTE 259M serial digital interfaces n DVB-ASI applications n Sonet/SDH and ATM interfaces n Digital routers and switches n Distribution amplifiers n Buffer applications n Video cameras Connection Diagram 20173101 16-Pin TSSOP Order Number LMH0202MT See NS Package Number MTC16 © 2006 National Semiconductor Corporation DS201731 www.national.com LMH0202 Typical Application 20173102 www.national.com 2 LMH0202 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 TSSOP θJC 16-pin TSSOP −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) LMH0202MT 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 Input Common Mode Voltage Input Voltage Swing Differential SDO1, SDO1, SDO2, SDO2 Single-ended, 75Ω load, RREF1 = 750Ω 1% RREF2 = 750Ω 1% Single-ended, 75Ω load, RREF1 = 590Ω 1% RREF2 = 590Ω 1% VSDHD ISDHD ICC SD/HD Input Voltage SD/HD Input Current Supply Current SD/HD1 = 0, SD/HD2 = 0, (Note 5) SD/HD1 = 1, SD/HD2 = 1, (Note 5) Min for SD Max for HD SD/HD1, SD/HD2 750 Conditions Reference SDI1, SDI1, SDI2, SDI2 Min 1.6 + VSDI/2 100 VCC – VSDO 800 850 Typ Max VCC – VSDI/2 2000 Units V mVP−P V VCMOUT Output Common Mode Voltage VSDO Output Voltage Swing mVP-P 900 2.4 1000 1100 mVP-P V 0.8 3.7 90 76 98 86 V µA mA mA 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/HD1 = 0, SD/HD2 = 0, 20% – 80%, (Note 6) SD/HD1 = 1, SD/HD2 = 1, 20% – 80%, (Note 6) Mismatch in Rise/Fall Time tOS RLSDO Output Overshoot Output Return Loss (Note 4) (Note 4) (Note 7) 15 20 400 Reference SDI1, SDI1, SDI2, SDI2 SDO1, SDO1, SDO2, SDO2 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. 3 www.national.com LMH0202 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 LMH0202 meets this specification on the SD202 evaluation board from 5MHz to 1.5GHz. Pin Descriptions Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 SDI1 SDI1 VEE1 RREF1 SDI2 SDI2 VEE2 RREF2 VCC2 SD/HD2 SDO2 SDO2 VCC1 SD/HD1 SDO1 SDO1 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. 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. 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 LMH0202 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. 20173104 FIGURE 1. Differential Input Stage for SDI and SDI. www.national.com 4 LMH0202 Device Operation DVB-ASI APPLICATIONS (Continued) OUTPUT INTERFACING The LMH0202 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 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. OUTPUT SLEW RATE CONTROL The LMH0202 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. The dual differential inputs of the LMH0202 may be externally routed to a single differential input as shown in Figure 2. This provides a solution for DVB-ASI applications where two non-inverted outputs are needed. 20173103 FIGURE 2. Single Differential Input for DVB-ASI 5 www.national.com LMH0202 Dual SMPTE 292M / 259M Serial Digital Cable Driver Physical Dimensions inches (millimeters) unless otherwise noted 16-Pin TSSOP Order Number LMH0202MT NS Package Number MTC16 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. LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. 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