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EVM710AHF Datasheet(PDF) 7 Page - Semtech Corporation |
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EVM710AHF Datasheet(HTML) 7 Page - Semtech Corporation |
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7 / 17 page  7 2000 Semtech Corp. www.semtech.com EDGE HIGH-PERFORMANCE PRODUCTS Edge710 Circuit Description (continued) Window Comparator Two comparators are connected on-chip to form a window comparator to determine whether the DUT is high, low, or in an indeterminant state. VINP is tied to the positive inputs of both comparators. The selection of either comparator A or B for the DUT high versus the DUT low is arbitrary. However, because the positive input is used on both comparators, the comparator used to detect DUT low will have an inversion at it digital outputs. The figure below shows the correct polarity for the comparator connections. Thresholds CVA and CVB are the two comparator threshold levels. These inputs are high impedance voltage controlled inputs that determine at which VINP voltage the comparators will change output states. PECL Level Capability PECL is the power supply level for the output stage of the comparators. When connected to ground, the comparator outputs will be standard ECL outputs. However, by making PECL more positive, QA / QA* and QB / QB* will track PECL and also become more positive. By raising these voltage levels, the comparators may connect directly with CMOS ICs. QA* QA QB QB* IPD_C PECL CVA VINP CVB The power supply driving the PECL pin must be capable of sourcing all the current flowing out of the QA/QA* and QB/ QB* open emitter outputs. Comparator Input Protection VINP connect to over-voltage diodes connected to the positive and negative power supplies. These diodes are sized to handle up to 100 mA current. Thermal Monitor An on-chip thermal diode string of five diodes in series exists (see figure below). This string allows accurate die temperature measurements. An external bias current of 100 µA is injected through the string, and the measured voltage corresponds to a specific junction temperature with the following equation: Tj[ °C] = {(ANODE - CATHODE)/5 – .7752} / (–.0018). ANODE CATHODE Temperature Coefficient = –9 mV / ˚C Bias Current |
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