1 of 3 proprietary & confidential GS3140 product brief rev.0 pds-060941 january 2015 gennum products GS3140 multi-rate adaptive 3g sdi equalizer www.semtech.com key features ? multi-standard operation at rates between 1mb/s and 2.97gb/s ? smpte st 424, smpte st 292 and smpte st 259 compliant ? aes10 (madi) compatible ? industry leading cable reach, with automatic cable equalization for different lengths of cable ? performance optimized for 125mb/s, 270mb/s, 1.485gb/s, and 2.97gb/s. typical equalized length of belden 1694a cable up to: ? 200m at 2.97gb/s ? 280m at 1.485gb/s ? 500m at 270mb/s ? 1.8v core power supply ? typical power consumption of 84mw when dc-coupled at 1.2v with output_swing = 0011 b ? ultra-low power mode for shorter cable reach applications ? upstream launch swing co mpensation from 250mv ppd to 1v ppd in approximately 50mv ppd steps (default 750mv ppd ) ? auto/manual bypass (useful for low data rates with slow rise/fall times) ? robust, noise-immune signal detection with squelch threshold adjustment ? auto/manual control of sl eep/mute/disable output modes ? data rate detection and indication ? GS3140 is a high-speed bicmos device designed to equalize and restore sign als received over cable. the device is designed to suppo rt smpte st 424, smpte st 292, smpte st 259 and aes10 (madi), and it is optimized for performance at 125mb/s, 270mb/s, 1.485gb/s, and 2.97gb/s. the device supports madi serial signals at 125mb/s with peak-to-peak launch amplitude between 300mv ppd and 600mv ppd (with aes10 spec rise and fall times) and 800mv ppd 10% (with sd-sdi rise and fall times). the GS3140 features dc restoration to compensate for the dc content of smpte pathological signals. loss of signal (los) is detected when the input carrier is lost or signal amplitude falls be low a programmable threshold. this is further processed by a filter programmable up to 1.6s before los status is asserted. the device can be programmed to automaticall y sleep/mute/disable the output on loss of signal. an interrupt pin (int) indicates los by default, and can be programmed to signal various other statuses. when the bypass control bit is set, the equalizing and dc restore stages are disengaged. this is useful for signals launched at the source with lo w data rates and/or slow rise and fall times.
GS3140 product brief rev.0 pds-060941 january 2015 2 of 3 proprietary & confidential www.semtech.com the differential output can be dc-coupled to semtechs reclockers and cable drivers, as well as industry-standard +1.2v, +1.8v and +2.5v cml logic by changing the voltage applied to the vcc_o pin. the GS3140 also features programmable output de-emphasis with eight user-selectable operating levels to support long pcb traces at th e output of the device. the output swing can be programm ed, via the user interface, from approximately 250mv ppd to 1v ppd in 50mv ppd steps. the device comes in a 16 -pin, 4mm x 4mm qfnCcol package. power consumption of the gs31 40 is typically 84mw when dc-coupled to a +1.2v termination voltage with output_swing = 0011 b . the GS3140 is pb-free, and the encapsulation compound does not contain halogenated flame retardant. this component and all homo geneous subcomponents are rohs compliant. GS3140 functional block diagram control and status equalizer dc restore output trace driver agc vcc_a sdi vee_a agc vee_o ddo vcc_o sclk sdin sdout sdi agc ddo cs int vcc_d
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