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ISL36111DRZ-T7 Datasheet(PDF) 6 Page - Intersil Corporation |
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ISL36111DRZ-T7 Datasheet(HTML) 6 Page - Intersil Corporation |
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6 / 8 page  6 FN6974.0 November 19, 2009 Line Silence/Quiescent Mode Line silence is commonly broken by the limiting amplification in other equalizers. This disruption can be detrimental in many systems that rely on line silence as part of the protocol. The ISL36111 contains special lane management capabilities to detect and preserve periods of line silence while still providing the fidelity-enhancing benefits of limiting amplification during active data transmission. Line silence is detected by measuring the amplitude of the input signal and comparing that to a threshold set by the voltage at the DT pin. When the amplitude falls below the threshold, the output driver stage is muted. LOS Bar Indicator Pin 4 (LOSB) is used to output the state of the muting circuitry to serve as a loss of signal indicator for the device. This signal is directly derived from the muting signal output by the detection threshold / signal detector comparator. The LOSB signal goes LOW when the signal detector output is below the externally controlled detection threshold and HIGH when the detector output goes above this threshold. This feature is meant to be used in optical systems (e.g. SFP+) where there are no quiescent or electrical-idle states. In these cases, the detection threshold is used to determine the sensitivity of the LOSB indicator. Figure 7 shows the schematic of the LOSB equivalent output structure. Detection Thereshold (DT) Pin Functionality The ISL36111 is capable of maintaining periods of line silence by monitoring the channel for loss of signal (LOS) conditions and subsequently muting the output driver when such a condition is detected. A reference voltage applied to the detection threshold (DT) pin is used to set the LOS threshold of the internal signal detection circuitry. The DT voltage is set with an external pull-up resistor, RDT. For typical applications, a 30kΩ resistor is recommended for channels with loss greater than 12dB at 5GHz, and a 1.8kΩ resistor is recommended for lower loss channels. Other values of the resistor may also be applicable; therefore DT settings should be verified on an application-specific basis. About Q:ACTIVE® Intersil has long realized that to enable the complex server clusters of next generation datacenters, it is critical to manage the signal integrity issues of electrical interconnects. To address this, Intersil has developed its groundbreaking Q:ACTIVE® product line. By integrating its analog ICs inside cabling interconnects, Intersil is able to achieve unsurpassed improvements in reach, power consumption, latency, and cable gauge size as well as increased airflow in tomorrow’s datacenters. This new technology transforms passive cabling into intelligent “roadways” that yield lower operating expenses and capital expenditures for the expanding datacenter. Intersil Lane Extenders allow greater reach over existing cabling while reducing the need for thicker cables. This significantly reduces cable weight and clutter, increases airflow, and improves power consumption. FIGURE 6. CML OUTPUT EQUIVALENT CIRCUIT FOR THE ISL36111 FIGURE 7. LOSB EQUIVALENT OUTPUT STRUCTUR VDD LOSB 11k Internal LOS Indicator Ω ISL36111 |
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