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GS2984 Dataheets PDF



Part Number GS2984
Manufacturers Gennum
Logo Gennum
Description Adaptive Cable Equalizer
Datasheet GS2984 DatasheetGS2984 Datasheet (PDF)

GS2984 Adaptive Cable Equalizer Key Features • SMPTE 424M, SMPTE 292M and SMPTE 259M compliant • Automatic cable equalization • Multi-standard operation from 143Mb/s to 2.97Gb/s • Performance optimized for 270Mb/s, 1.485Gb/s and 2.97Gb/s. Typical equalized length of Belden 1694A cable: Š 140m at 2.97Gb/s Š 200m at 1.485Gb/s Š 400m at 270Mb/s • Supports DVB-ASI at 270Mb/s • Manual bypass (useful for low data rates with slow rise/fall times) • Programmable carrier detect with squelch threshold ad.

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GS2984 Adaptive Cable Equalizer Key Features • SMPTE 424M, SMPTE 292M and SMPTE 259M compliant • Automatic cable equalization • Multi-standard operation from 143Mb/s to 2.97Gb/s • Performance optimized for 270Mb/s, 1.485Gb/s and 2.97Gb/s. Typical equalized length of Belden 1694A cable: Š 140m at 2.97Gb/s Š 200m at 1.485Gb/s Š 400m at 270Mb/s • Supports DVB-ASI at 270Mb/s • Manual bypass (useful for low data rates with slow rise/fall times) • Programmable carrier detect with squelch threshold adjustment • Differential outputs support DC coupling to 3.3V and 2.5V CML logic • 0/6 dB gain boost selection pin • Standard EIA/JEDEC logic control and status signal levels • Single 3.3V power supply operation • 195mW power consumption (typical) • Wide temperature range of -40ºC to +85ºC • Small footprint QFN package (4mm x 4mm) Š Drop-in compatible with the GS2974 • Pb-free and RoHS compliant Applications • SMPTE 424M, SMPTE 292M and SMPTE 259M coaxial cable serial digital interfaces Description The GS2984 is a high-speed BiCMOS integrated circuit designed to equalize and restore signals received over 75Ω coaxial cable. The device is designed to support SMPTE 424M, SMPTE292M and SMPTE 259M, and is optimized for performance at 270Mb/s, 1.485Gb/s and 2.97Gb/s. The GS2984 features DC restoration to compensate for the DC content of SMPTE pathological test patterns. The Carrier Detect output pin (CD) indicates whether a valid input signal has been detected. It can be connected directly to the MUTE pin to mute the output on loss of carrier. A voltage programmable threshold, which can be changed via the SQ_ADJ pin, forces CD high when the input signal amplitude falls below the threshold. This allows the GS2984 to distinguish between low-amplitude SDI signals and noise at the input of the device. The equalizing and DC restore stages are disengaged when the BYPASS pin is HIGH. No equalization occurs in Bypass mode. The GS2984 includes a gain selection pin (GAIN_SEL) which, when tied HIGH, compensates for 6dB flat attenuation. The differential outputs can be DC-coupled to Gennum 3.3V cable drivers and reclockers and to industry-standard 3.3V and 2.5V CML logic using the CMSET pin. The GS2984 is footprint and drop-in compatible with existing GS2974 designs, with no additional application changes required. The device is available in a 16-pin, 4mm x 4mm QFN package. Power consumption of the GS2984 is typically 195mW. The GS2984 is Pb-free, and the encapsulation compound does not contain halogenated flame retardant. This component and all homogeneous subcomponents are RoHS compliant. GS2984 Adaptive Cable Equalizer Data Sheet 50985 - 3 March 2010 www.gennum.com 1 of 20 SDI SDI GAIN_SEL SQ_ADJ BYPASS MUTE Squelch Adjust Carrier Detect Mute CD Equalizer DC Restore Output AGC Revision History AGC AGC GS2984 Functional Block Diagram CMSET Version 3 2 1 0 B A ECR 153913 152311 152027 151621 151182 150385 PCN 54547 – – – – – Date March 2010 July 2009 J.


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