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| LMH0034 SMPTE 292M / 259M Adaptive Cable Equalizer June 2006 LMH0034 SMPTE 292M / 259M Adaptive Cable Equalizer General Description The LMH0034 SMPTE 292M / 259M adaptive cable equalizer is a monolithic integrated circuit for equalizing data transmitted over cable (or any media with similar dispersive loss characteristics). The equalizer operates over a wide range of data rates from 143 Mbps to 1.485 Gbps and supports SMPTE 292M, SMPTE 344M and SMPTE 259M. The LMH0034 implements DC restoration to correctly handle pathological data conditions. DC restoration can be bypassed for low data rate applications. The equalizer is flexible in allowing either single-ended or differential input drive. Additional features include a combined carrier detect and output mute pin which mutes the output when no signal is present. A programmable mute reference is used to mute the output at a selectable level of signal degradation. A cable length indicator is provided to determine the amount of cable being equalized. Features n SMPTE 292M, SMPTE 344M and SMPTE 259M compliant n Supports DVB-ASI at 270 Mbps n High data rates: 143 Mbps to 1.485 Gbps n Equalizes up to 200 meters of Belden 1694A at 1.485 Gbps or up to 400 meters of Belden 1694A at 270 Mbps n Manual bypass, cable length indicator, and output mute with a programmable threshold n Single-ended or differential input n 50 differential outputs n Single 3.3V supply operation n 208mW typical power consumption with 3.3V supply n Replaces the GS1524 and GS1524A Applications n SMPTE 292M, SMPTE 344M, and SMPTE 259M serial digital interfaces n Serial digital data equalization and reception n Data recovery equalization Typical Application 20173401 (c) 2006 National Semiconductor Corporation DS201734 www.national.com LMH0034 Absolute Maximum Ratings (Note 1) Supply Voltage Input Voltage (all inputs) Storage Temperature Range Junction Temperature Lead Temperature (Soldering 4 Sec) Package Thermal Resistance JA 16-pin SOIC JC 16-pin SOIC ESD Rating (HBM) ESD Rating (MM) -0.5V to 3.6V -0.3V to VCC+0.3V -65C to +150C +150C +260C +115C/W +105C/W 8kV 250V Recommended Operating Conditions Supply Voltage (VCC - VEE) Input Coupling Capacitance AEC Capacitor (Connected between AEC+ and AEC-) Operating Free Air Temperature (TA) 3.3V 5% 1.0 F 1.0 F 0C to +85C 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 At LMH0034 input, (Notes 4, 6) SDO, SDO 50 load, differential 0m cable Max cable MUTEREF DC Voltage (floating) MUTEREF Range CD/MUTE Output Voltage CD/MUTE Input Voltage ICC Supply Current Carrier not present Carrier present Min to mute outputs Max to force outputs active (Note 7) 63 3.0 2.0 77 CD/MUTE 2.6 0.4 MUTEREF CLI Conditions Reference SDI, SDI 720 Min Typ 1.9 800 VCC - VSDO/2 750 2.5 1.6 1.3 0.7 950 Max Units V mVP-P V mVP-P V V V V V V V V mA VCMOUT Output Common Mode Voltage VSDO Output Voltage Swing CLI DC Voltage www.national.com 2 LMH0034 AC Electrical Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Note 3). Symbol Parameter BRSDI Input Data Rate Jitter for various cable lengths (with equalizer pathological) 270 Mbps, Belden 1694A, 400 meters (Note 4) 270 Mbps, Belden 8281, 280 meters (Note 4) 1.485 Gbps, Belden 1694A, 140 meters (Note 4) 1.485 Gbps, Belden 8281, 100 meters (Note 4) 1.485 Gbps, Belden 1694A, 200 meters (Note 4) tr,tf tOS ROUT RLIN RIN CIN Output Rise Time, Fall Time Mismatch in Rise/Fall Time Output Overshoot Output Resistance Input Return Loss Input Resistance Input Capacitance 20% - 80%, (Note 4) (Note 4) (Note 4) single-ended, (Note 5) (Note 8) single-ended single-ended, (Note 5) SDI, SDI 15 SDO, SDO Conditions Reference SDI, SDI Min 143 0.2 0.2 0.25 0.25 0.3 100 2 1 50 18-20 1.3 1 220 15 5 ps ps % dB k pF Typ Max 1485 Units Mbps UI UI UI UI 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 = +25C. Note 4: Specification is guaranteed by characterization. Note 5: Specification is guaranteed by design. Note 6: The maximum input voltage swing assumes a nonstressing, DC-balance signal; specifically, the SMPTE-recommended color bar test signal. Pathological or other stressing signals may not be used. This specification is for 0m cable only. Note 7: Supply current depends on the amount of cable being equalized. The current is highest for short cable and decreases as the cable length is increased. Refer to Figures 1, 2. Note 8: Input return loss is dependent on board design. The LMH0034 meets this specification on the SD034 evaluation board from 5MHz to 1.5GHz. 3 www.national.com LMH0034 Connection Diagram 20173403 16-Pin SOIC Order Number LMH0034MA See NS Package Number M16A Pin Descriptions Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 CLI VCC VEE SDI SDI VEE AEC+ AECBYPASS MUTEREF VEE SDO SDO VEE VCC CD/MUTE Name Description Cable length indicator. Provides a voltage inversely proportional to the cable length being equalized. Positive power supply (+3.3V). Negative power supply (ground). Serial data true input. Serial data complement input. Negative power supply (ground). AEC loop filter external capacitor (1F) positive connection. AEC loop filter external capacitor (1F) negative connection. Bypasses equalization and DC restoration when high. No equalization occurs in this mode. Mute reference. Determines the maximum cable to be equalized before muting. May be unconnected for maximum equalization. Negative power supply (ground). Serial data complement output. Serial data true output. Negative power supply (ground). Positive power supply (+3.3V). Bi-directional carrier detect and output mute. CD/MUTE is high when no signal is present. If unconnected, MUTE is controlled automatically by carrier detect. To force MUTE on, tie to VCC. To disable MUTE, tie to GND. CD/MUTE has no function in BYPASS mode. www.national.com 4 LMH0034 Block Diagram 20173402 Device Operation BLOCK DESCRIPTION The Equalizer Filter block is a multi-stage adaptive filter. If Bypass is high, the equalizer filter is disabled. The DC Restoration / Level Control block receives the differential signals from the equalizer filter block. This block incorporates a self-biasing DC restoration circuit to fully DC restore the signals. If Bypass is high, this function is disabled. The signals before and after the DC Restoration / Level Control block are used to generate the Automatic Equalization Control (AEC) signal. This control signal sets the gain and bandwidth of the equalizer filter. The loop response in the AEC block is controlled by an external 1F capacitor placed across the AEC+ and AEC- pins. Cable Length Indicator (CLI) is derived from this block. The Carrier Detect / Mute block generates the carrier detect signal and controls the mute function of the output. This block utilizes the bi-directional CD/MUTE signal along with Mute Reference (MUTEREF). The Output Driver produces SDO and SDO. CABLE LENGTH INDICATOR (CLI) The cable length indicator provides a voltage to indicate the length of cable being equalized. The CLI voltage decreases as the cable length increases. MUTE REFERENCE (MUTEREF) The mute reference determines the amount of cable to equalize before automatically muting the outputs. This is set by applying a voltage inversely proportional to the length of 5 cable to equalize. As the applied MUTEREF voltage is increased, the amount of cable that can be equalized before carrier detect is de-asserted and the outputs are muted is decreased. MUTEREF may be left unconnected for maximum equalization before muting. CARRIER DETECT / MUTE (CD/MUTE) Carrier Detect / Mute is bi-directional, serving as both a carrier detect (output function) and mute (input function). When used as an output, CD/MUTE determines if a valid signal is present at the LMH0034 input. If MUTEREF is used, the carrier detect threshold will be altered accordingly. CD/MUTE provides a high voltage when no signal is present at the LMH0034 input, and the outputs are automatically muted. CD/MUTE is low when a valid input signal has been detected, and the outputs are automatically enabled. As an input, CD/MUTE can be used to override the carrier detect and manually mute or enable the LMH0034 outputs. Applying a high input to CD/MUTE will mute the LMH0034 outputs. Applying a low input will force the outputs to be active regardless of the length of cable or the state of MUTEREF. INPUT INTERFACING The LMH0034 accepts either differential or single-ended input. The input must be AC coupled. Transformer coupling is not supported. The LMH0034 correctly handles equalizer pathological signals for standard definition and high definition serial digital video, as described in SMPTE RP 178 and RP 198, respectively. www.national.com LMH0034 Device Operation OUTPUT INTERFACING (Continued) The SDO and SDO outputs are internally loaded with 50. They produce a 750 mVP-P differential output, or a 375 mVP-P single-ended output. Application Information PCB LAYOUT RECOMMENDATIONS Please refer to the following Application Note on National's website: AN-1372, "CLC034 PCB Layout Techniques." REPLACING THE GENNUM GS1524 The LMH0034 is form-fit-function compatible with the Gennum GS1524 and GS1524A. SUPPLY CURRENT VS. CABLE LENGTH The supply current (ICC) depends on the amount of cable being equalized. The current is highest for short cable and decreases as the cable length is increased. Figure 1 shows supply current vs. Belden 1694A cable length for 1.485 Gbps data and Figure 2 shows supply current vs. Belden 1694A cable length for 270 Mbps data. 20173415 FIGURE 2. Supply Current vs. Belden 1694A Cable Length, 270 Mbps 20173413 FIGURE 1. Supply Current vs. Belden 1694A Cable Length, 1.485 Gbps www.national.com 6 LMH0034 SMPTE 292M / 259M Adaptive Cable Equalizer Physical Dimensions inches (millimeters) unless otherwise noted 16-Pin SOIC Order Number LMH0034MA NS Package Number M16A 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. Life support devices or systems are devices or systems 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. BANNED SUBSTANCE COMPLIANCE National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C2) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/quality/green. Lead free products are RoHS compliant. National Semiconductor Americas Customer Support Center Email: new.feedback@nsc.com Tel: 1-800-272-9959 www.national.com 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: +44 (0) 870 24 0 2171 Francais Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Support Center Email: ap.support@nsc.com National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: jpn.feedback@nsc.com Tel: 81-3-5639-7560 2. A critical component is any component of 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. |
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