GS1674 Datasheet | SEMTECH

GS1674 Adaptive Cable Equalizer The GS1674 is a high-speed Bi CMOS integrated circuit designed to equalize and restore signals received over 75Ω coaxial cable. The device is optimized for performance at 270Mb/s and 1.485Gb/s, and Features DC restoration to pensate 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. The sensitivity of the carrier detect can be easily programmed to allow the GS1674 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 GS1674 is footprint and drop-in patible with existing GS1574A and LMH0044 designs, with no additional application changes required. Key Features - Replaces the LMH0044 - SMPTE 292M, SMPTE 344M and SMPTE 259M pliant - Automatic cable equalization - Performance optimized for 270Mb/s and 1.485Gb/s. Typical equalized length of Belden 1694A cable: - 220m at 1.485Gb/s - 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 - Standard EIA/JEDEC logic control and status signal levels - Single 3.3V power supply operation - 195m W power consumption (typical) - Wide temperature range of -40ºC to +85ºC - Small footprint QFN package (4mm x 4mm) - Drop-in patible with the GS1574A. Forward patible with Gennum's 3G EQ products. - Pb-free and Ro HS pliant Typical Application Circuit MUTE VCC VCC 6.8n H- SDI 75Ω 10n F 1µF 1µF 16 15 14 13 VCC_A...