GS3441 Extended Reach 3G/HD/SD Adaptive Cable Equalizer with Dual Outputs Key Features Applications SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259 SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259 coaxial cable serial digital interfaces compliant Automatic cable equalization Description Multi-standard operation from 125Mb/s to 2.97Gb/s The GS3441 is a high-speed BiCMOS device designed to Performance optimized for 270Mb/s, 1.485Gb/s and equalize and restore signals received over 75 coaxial 2.97Gb/s. Typical equalized length of Belden 1694A cable. cable up to: The device is designed to support SMPTE ST 424, 210m at 2.97Gb/s SMPTE ST 292 and SMPTE ST 259, and is optimized for 300m at 1.485Gb/s performance at 270Mb/s, 1.485Gb/s and 2.97Gb/s. 550m at 270Mb/s The GS3441 features DC restoration to compensate for the Supports DVB-ASI at 270Mb/s DC content of SMPTE pathological signals. Supports MADI at 125Mb/s The Carrier Detect output pin (CD) indicates whether an Dual, independently-controlled outputs input signal has been detected. It can be connected directly Manual bypass (useful for low data rates with slow to the SLEEP pin to enable automatic power-down upon rise/fall times) loss of carrier. Programmable carrier detect with squelch threshold A voltage programmable threshold, set via the SQ ADJ pin, adjustment forces CD high when the input signal amplitude falls below Cable Length Indicator (CLI) output varies the threshold. This allows the GS3441 to distinguish monotonically with input cable length between low-amplitude SDI signals and noise at the input of the device. Automatic power-down on loss of signal Standby power <35 mW (typical) The equalizing and DC restore stages are disengaged and no equalization occurs when the BYPASS pin is HIGH. Differential outputs support DC coupling from 1.2V to Setting the BYPASS pin HIGH is useful for signals launched 3.3V CML logic at the signal source with low data rates and/or slow rise/fall Option to compensate for 6dB flat attenuation prior to times. input of device The GS3441 features a gain selection pin (GAIN SEL) which Selectable output de-emphasis: 2dB, 4dB and 6dB can be used to compensate for 6dB flat attenuation prior to Standard EIA/JEDEC logic control and status signal input of the device. levels The differential outputs can be DC-coupled to Semtechs Single 3.3V power supply operation reclockers and cable drivers, as well as industry-standard 180mW (one output enabled), 212mW (both outputs 1.2V, 1.8V, 2.5V and 3.3V CML logic by changing the enabled) typical power consumption voltage applied to the VCC O pin. In general, DC-coupling Wide operating temperature range of -40C to +85C to any termination voltage between 1.2V and 3.3V is Small footprint QFN package (4mm x 4mm) supported. Pb-free and RoHS compliant GS3441 Extended Reach 3G/HD/SD Adaptive Cable 1 of 25 www.semtech.com Equalizer with Dual Outputs Final Data Sheet Rev. 1 Proprietary & Confidential GENDOC-056647 May 2013 Description (Continued) Power consumption of the GS3441 is typically 212mW The GS3441 also features programmable output when DC-coupled at 1.2V. de-emphasis with three, user-selectable operating levels to support long PCB traces at the output of the device. The GS3441 is Pb-free, and the encapsulation compound does not contain halogenated flame retardant. The device comes in a 24-pin, 4mm x 4mm QFN package and is footprint compatible with Semtechs GS2993 This component and all homogeneous subcomponents are equalizer. RoHS compliant. SQ ADJ BYPASS CLI SLEEP CD Squelch Adjust Carrier Detect Mute VCC A OP1 EN VCC O1 SDI DC Equalizer DDO1 Restore SDI Output 1 DDO1 GAIN SEL OP1 CTL VEE O1 AGC OP2 EN VEE A VCC O2 DDO2 DDO2 Output 2 OP2 CTL VEE O2 AGC AGC GS3441 Functional Block Diagram GS3441 Extended Reach 3G/HD/SD Adaptive Cable 2 of 25 www.semtech.com Equalizer with Dual Outputs Final Data Sheet Rev. 1 Proprietary & Confidential GENDOC-056647 May 2013