CLC034

CLC034 SMPTE 292M / 259M Adaptive Cable Equalizer PRELIMINARY February 2005 CLC034 SMPTE 292M / 259M Adaptive Cable Equalizer General Description The CLC034 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 CLC034 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 270Mbps n High data rates: 143 Mbps to 1.485 Gbps n Equalizes up to 140 meters of Belden 1694A at 1.485 Gbps or up to 350 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 50Ω differential outputs n Single 3.3V supply operation n Replaces the GS1524 Applications n SMPTE 292M, SMPTE 344M, and SMPTE 259M serial digital interfaces Typical Application 20085901 © 2005 National Semiconductor Corporation DS200859 www.national.com CLC034 Absolute Maximum Ratings (Note 1) Supply Voltage Input Voltage (all inputs) ESD Rating (HBM) −0.5V to 3.6V −0.3V to VCC+0.3V 2kV Input Coupling Capacitance Cable Input Voltage Swing (Note 5) Operating Free Air Temperature (TA) 1.0 µF 720 to 880 mVP-P 0˚C to +70˚C Recommended Operating Conditions Supply Voltage (VCC – VEE) 3.3V ± 5% 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 0m cable length, differential, (Note 6) SDO, SDO 50Ω load, differential 0m cable no signal 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 80 3.0 2.0 90 CD/MUTE 2.6 1.2 MUTEREF CLI Conditions Reference SDI, SDI 720 Min Typ 1.75 800 VCC – VSDO/2 750 2.5 1.9 1.3 0.69 950 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 CLC034 AC Electrical Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Note 3). Symbol Parameter BRSDI Input Data Rate Maximum Equalized Cable Length (with equalizer pathological) 270Mbps, Belden 1694A, 0.2UI output jitter 270Mbps, Belden 8281, 0.2UI output jitter 1.485Gbps, Belden 1694A, 0.25UI output jitter 1.485Gbps, Belden 8281, 0.25UI output jitter 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 single-ended single-ended Note 4 single-ended SDI, SDI 15 50 18-20 TBD 1 20% – 80% SDO, SDO Conditions Reference SDI, SDI Min 143 350 280 140 100 80 220 30 10 Typ Max 1485 Units Mbps m m m m ps ps % Ω dB kΩ pF 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 design. Note 5: These specifications assume and 800 mVP-P signal at the cable input. Levels above and below 800 mV are allowable, but performance may vary. The cable will attenuate the signal prior to entering the equalizer. Note 6: The maximum input voltage swing of 950 mVP-P 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. 3 www.national.com CLC034 Connection Diagram 20085903 16-Pin SOIC Order Number CLC034MA 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 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 (1µF) positive connection. AEC loop filter external capacitor (1µF) 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. 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 by the MUTEREF setting. 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 CLC034 Block Diagram 20085902 Device Operation BLOCK DESCRIPTION The Equalizer block is a multi-stage adaptive filter. If Bypass is high, the equalizer is disabled. The DC Restore block receives the differential signals from the equalizer filter block. This block incorporates a selfbiasing DC restore circuit to fully DC restore the signals. If Bypass is high, this function is disabled. The Output block produces SDO and SDO. The Cable Length Indicator provides a voltage to indicate the length of cable being equalized. The Mute Reference determines the amount of cable to equalize before muting the outputs. This is set by applying a voltage proportional to the required length of cable. The higher the voltage, the lower the mute threshold. Carrier Detect / Mute is bi-directional, serving two purposes. As an output, carrier detect monitors the signal power out of the equalizing filter and compares it to the mute reference to determine if a valid signal is present. Carrier detect provides a high voltage when no signal is present. Mute can be forced on or off by using this pin as an input. Mute is forced off if this pin is tied to ground, and the outputs will always mute if this pin is tied to VCC. The loop response in the AEC block is controlled by an external 1µF capacitor placed across the AEC+ and AECpins. INPUT INTERFACING The CLC034 accepts either differential or single-ended input. The input must be AC coupled. Transformer coupling is not supported. The CLC034 correctly handles equalizer pathological signals for standard definition and high definition serial digital video, as described in SMPTE RP 178 and RP 198, respectively. OUTPUT INTERFACING The SDO and SDO outputs are internally loaded with 50Ω. They produce a 750 mVP-P differential output, or a 375 mVP-P single-ended output. REPLACING THE GENNUM GS1524 The CLC034 is form-fit-function compatible with the Gennum GS1524. 5 www.national.com CLC034 SMPTE 292M / 259M Adaptive Cable Equalizer Physical Dimensions unless otherwise noted inches (millimeters) 16-Pin SOIC Order Number CLC034MA 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. 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