GS2984 Adaptive Cable Equalizer Signal Integrity Product Group Key Features Description SMPTE ST 424, SMPTE ST 292, and SMPTE ST 259 The GS2984 is a high-speed BiCMOS integrated circuit compliant designed to equalize and restore signals received over 75 coaxial cable. Automatic cable equalization Multi-standard operation from 143Mb/s to 2.97Gb/s The device is designed to support SMPTE ST 424, SMPTE ST 292, and SMPTE ST 259, and is optimized for Performance optimized for 270Mb/s, 1.485Gb/s, and performance at 270Mb/s, 1.485Gb/s, and 2.97Gb/s. 2.97Gb/s. Typical equalized length of Belden 1694A cable: The GS2984 features DC restoration to compensate for the 140m at 2.97Gb/s DC content of SMPTE pathological test patterns. 200m at 1.485Gb/s The Carrier Detect output pin (CD) indicates whether a valid input signal has been detected. It can be connected 400m at 270Mb/s directly to the MUTE pin to mute the output on loss of Supports DVB-ASI at 270Mb/s carrier. A voltage programmable threshold, which can be Manual bypass (useful for low data rates with slow changed via the SQ ADJ pin, forces CD high when the rise/fall times) input signal amplitude falls below the threshold. This Programmable carrier detect with squelch threshold allows the GS2984 to distinguish between low-amplitude adjustment SDI signals and noise at the input of the device. Differential outputs support DC coupling to 3.3V and The equalizing and DC restore stages are disengaged when 2.5V CML logic the BYPASS pin is HIGH. No equalization occurs in Bypass 0/6 dB gain boost selection pin mode. Standard EIA/JEDEC logic control and status signal The GS2984 includes a gain selection pin (GAIN SEL) levels which, when tied HIGH, compensates for 6dB flat Single 3.3V power supply operation attenuation. 195mW power consumption (typical) The differential outputs can be DC-coupled to Semtechs Wide temperature range of -40C to 85C 3.3V cable drivers and reclockers and to industry-standard Small footprint QFN package (4mm x 4mm) 3.3V and 2.5V CML logic using the CMSET pin. Drop-in compatible with the GS2974 The GS2984 is footprint and drop-in compatible with Pb-free and RoHS compliant existing GS2974 designs, with no additional application changes required. Applications The device is available in a 16-pin, 4mm x 4mm QFN package. SMPTE ST 424, SMPTE ST 292, and SMPTE ST 259 coaxial cable serial digital interfaces 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 1 of 21 www.semtech.com Final Data Sheet Rev. 5 Semtech GENDOC-050985 May 2015 Proprietary & ConfidentialSQ ADJ BYPASS MUTE CD Squelch Adjust Carrier Detect Mute DC SDI SDO Equalizer Output Restore SDI SDO GAIN SEL AGC AGC AGC CMSET GS2984 Functional Block Diagram Revision History Version ECO PCN Date Changes and/or Modifications 5 025743 May 2015 Updated document format. 4 019346 May 2014 Updated to the newest template. Changed ESD rating from 6kV to 5kV in Section 2.1 3 153913 54547 March 2010 Absolute Maximum Ratings. 2 152311 July 2009 Converted to Data Sheet. Removed Proprietary & Confidential from footer. 1 152027 June 2009 Updated 6.4 Marking Diagram. Converted to Preliminary Data Sheet. Added sections 2.4 Typical Performance Curves and 4.8 Output 0 151621 April 2009 Rise/Fall Times. Updates to Section 2. Electrical Characteristics. B 151182 January 2009 Updates. September A 150385 New document. 2008 GS2984 2 of 21 www.semtech.com Final Data Sheet Rev. 5 Semtech Proprietary & Confidential GENDOC-050985 May 2015