LMH0024 LMH0024 3.
LMH0024 3.3V SMPTE 259M / 344M Adaptive Cable Equalizer General Description Features The LMH0024 SMPTE 259M / 344M 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 125 Mbps to 540 Mbps and supports SMPTE 259M and SMPTE 344M. The LMH0024 implements DC restoration to correctly handle pathological data conditions.
LMH0024 Absolute Maximum Ratings (Note 1) Supply Voltage Input Voltage (all inputs) Storage Temperature Range Junction Temperature Lead Temperature (Soldering 4 Sec) Package Thermal Resistance θJA 16-pin SOIC θJC 16-pin SOIC ESD Rating (HBM) ESD Rating (MM) Recommended Operating Conditions −0.5V to 3.6V −0.3V to VCC+0.3V −65°C to +150°C +150°C Supply Voltage (VCC – VEE) Input Coupling Capacitance AEC Capacitor (Connected between AEC+ and AEC-) Operating Free Air Temperature (TA) +260°C 3.3V ±5% 1.
LMH0024 AC Electrical Characteristics Over Supply Voltage and Operating Temperature ranges, unless otherwise specified (Note 3). Symbol Parameter BRMIN Minimum Input Data Rate BRMAX Maximum Input Data Rate Maximum Equalized Cable Length (with equalizer pathological) tr,tf Conditions Reference Min SDI, SDI Typ Max 125 Units Mbps 540 Mbps 270 Mbps, Belden 1694A, 0.2UI output jitter, (Note 4) 350 m 270 Mbps, Belden 8281, 0.2UI output jitter, (Note 4) 280 m 540 Mbps, Belden 1694A, 0.
LMH0024 Connection Diagram 20172503 16-Pin SOIC Order Number LMH0024MA See NS Package Number M16A Pin Descriptions Pin # Name Description 1 CLI Cable length indicator. Provides a voltage inversely proportional to the cable length being equalized. 2 VCC Positive power supply (+3.3V). 3 VEE Negative power supply (ground). 4 SDI Serial data true input. 5 SDI Serial data complement input. 6 VEE Negative power supply (ground).
LMH0024 Block Diagram 20172502 Device Operation 2.6 2.5 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.
LMH0024 The LMH0024 correctly handles equalizer pathological signals for standard definition serial digital video, as described in SMPTE RP 178. supply current vs. Belden 1694A cable length for 270 Mbps data. 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.
LMH0024 Physical Dimensions inches (millimeters) unless otherwise noted 16-Pin SOIC Order Number LMH0024MA NS Package Number M16A 7 www.national.
LMH0024 3.3V SMPTE 259M / 344M Adaptive Cable Equalizer Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.
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