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GS3440 Datasheet(PDF) 1 Page - Semtech Corporation |
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GS3440 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 23 page  1 of 23 Proprietary and Confidential GS3440 Adaptive Cable Equalizer Final Data Sheet Rev. 2 December 2012 Extended Reach 3G/HD/SD Adaptive Cable Equalizer GS3440 www.semtech.com Key Features • SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259 compliant • Automatic cable equalization • Multi-standard operation from 125Mb/s to 2.97Gb/s • Performance optimized for 270Mb/s, 1.485Gb/s and 2.97Gb/s. Typical equalized length of Belden 1694A cable up to: 210m at 2.97Gb/s 300m at 1.485Gb/s 550m at 270Mb/s • Supports DVB-ASI at 270Mb/s • Supports MADI at 125Mb/s • Manual bypass (useful for low data rates with slow rise/fall times) • Programmable carrier detect with squelch threshold adjustment • Automatic power-down on loss of signal Standby power <35mW (typical) • Differential output supports DC-coupling from 1.2V to 3.3V CML logic • Option to compensate for 6dB flat attenuation prior to input of device • Selectable output de-emphasis: 2dB, 4dB and 6dB • Standard EIA/JEDEC logic control and status signal levels • Single 3.3V power supply operation • 180mW power consumption (typical) • Wide operating temperature range of -40ºC to +85ºC • Small footprint QFN package (4mm x 4mm) Footprint compatible with the GS2974A, GS2974B, GS2984 and GS2994 • Pb-free and RoHS compliant Applications • SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259 coaxial cable serial digital interfaces Description The GS3440 is a high-speed BiCMOS device designed to equalize and restore signals received over 75 Ω coaxial cable. The device is designed to support SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259, and is optimized for performance at 270Mb/s, 1.485Gb/s and 2.97Gb/s. The GS3440 features DC restoration to compensate for the DC content of SMPTE pathological signals. The Carrier Detect output pin (CD) indicates whether an input signal has been detected. It can be connected directly to the SLEEP pin to enable automatic sleep on loss of carrier. A voltage programmable threshold, set via the SQ_ADJ pin, forces CD high when the input signal amplitude falls below the threshold. This allows the GS3440 to distinguish between low-amplitude SDI signals and noise at the input of the device. The equalizing and DC restore stages are disengaged and no equalization occurs when the BYPASS pin is HIGH. Setting the BYPASS pin HIGH is useful for signals launched at the signal source with low data rates and/or slow rise/fall times. The GS3440 features a gain selection pin (GAIN_SEL) which can be used to compensate for 6dB flat attenuation prior to the input of the device. The differential output can be DC-coupled to Semtech’s reclockers and cable drivers, as well as industry-standard 1.2V, 1.8V, 2.5V and 3.3V CML logic by changing the voltage applied to the VCC_O pin. In general, DC-coupling to any termination voltage between 1.2V and 3.3V is supported. The GS3440 also features programmable output de-emphasis with three, user-selectable operating levels to support long PCB traces at the output of the device. |
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