GS3440 Extended Reach 3G/HD/SD Adaptive Cable Equalizer Gennum Products Key Features Applications SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259 SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259 coaxial compliant cable serial digital interfaces Automatic cable equalization Description Multi-standard operation from 125Mb/s to 2.97Gb/s The GS3440 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 GS3440 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 input signal has been detected. It can be connected Manual bypass (useful for low data rates with slow directly to the SLEEP pin to enable automatic sleep on loss rise/fall times) 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 Automatic power-down on loss of signal the threshold. This allows the GS3440 to distinguish Standby power <35mW (typical) between low-amplitude SDI signals and noise at the input of the device. Differential output supports DC-coupling from 1.2V to 3.3V CML logic The equalizing and DC restore stages are disengaged and no equalization occurs when the BYPASS pin is HIGH. Option to compensate for 6dB flat attenuation prior to Setting the BYPASS pin HIGH is useful for signals launched input of device at the signal source with low data rates and/or slow rise/fall Selectable output de-emphasis: 2dB, 4dB and 6dB times. Standard EIA/JEDEC logic control and status signal The GS3440 features a gain selection pin (GAIN SEL) which levels can be used to compensate for 6dB flat attenuation prior to Single 3.3V power supply operation the input of the device. 180mW power consumption (typical) The differential output can be DC-coupled to Semtechs reclockers and cable drivers, as well as industry-standard Wide operating temperature range of -40C to +85C 1.2V, 1.8V, 2.5V and 3.3V CML logic by changing the voltage Small footprint QFN package (4mm x 4mm) applied to the VCC O pin. In general, DC-coupling to any Footprint compatible with the GS2974A, GS2974B, termination voltage between 1.2V and 3.3V is supported. GS2984 and GS2994 The GS3440 also features programmable output Pb-free and RoHS compliant de-emphasis with three, user-selectable operating levels to support long PCB traces at the output of the device. GS3440 1 of 24 www.semtech.com Final Data Sheet Rev.3 GENDOC-056482 September 2014 Proprietary and ConfidentialDescription (continued) The device comes in a 16-pin, 4mm x 4mm QFN package and is footprint compatible with Semtechs GS2974A, GS2974B, GS2984 and GS2994 equalizers. Power consumption of the GS3440 is typically 180mW when DC-coupled at 1.2V. The GS3440 is Pb-free, and the encapsulation compound does not contain halogenated flame retardant. This component and all homogeneous subcomponents are RoHS compliant. SQ ADJ BYPASS SLEEP CD Squelch Adjust Carrier Detect VCC O VCC A Mute SDI DC DDO Equalizer Restore SDI DDO Output GAIN SEL VEE O OP CTL AGC VEE A AGC AGC GS3440 Functional Block Diagram GS3440 2 of 24 www.semtech.com Final Data Sheet Rev.3 Proprietary and Confidential GENDOC-056482 September 2014