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ISL55142 Datasheet(PDF) 3 Page - Intersil Corporation |
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ISL55142 Datasheet(HTML) 3 Page - Intersil Corporation |
3 / 7 page 3 AN1270.0 September 27, 2006 Finally the center off position provides a means of connecting a repetitive signal source to the PD input. This is so the user can observe power-down enable/disable timing. An important note to remember when using the PD - BNC: 1. Place the switch in center-off position. 2. The PD input is referenced to VCC/VEE. The low amplitude of the PD input must match the VEE voltage. The high amplitude must be close to VCC. Comparator Threshold Rails Each comparator has two thresholds. CVA/CVB. The data sheet explains the operation of these analog inputs. However, it should be mentioned that while the ISL55142 (Dual) and ISL55143 (QUAD) comparators have separate threshold inputs for each comparator, the evaluation boards have all CVA inputs tied to single CVA_BUS. Accordingly, all CVB inputs are tied to a single CVB_BUS. Initial Power-Up Please refer to the device specification for power-up sequencing and current requirements. Also note that the frequency of operation and number of comparators will determine the current needed. There are graphs in the specification regarding current characteristics. When first powering up the device, set all power bus inputs to minimum current levels needed for quiescent operation. Check the device out statically with DC inputs on the VINP pins and observe that the QA/QB outputs toggle when the VINP voltage crosses the CVA and CVB thresholds. Once static observations check out, you can then increase power current limits for VCC/VEE and VOH/VOL and apply higher frequency inputs to the VINP pins. Layout Information All evaluation boards have complete silk-screen information regarding test points, jumpers and component placements. The silk-screen on the board you receive will provide up-to-date layout information. Schematic Information Schematics are drawn with physical location in mind. Any changes in electrical circuitry will be updated in this document as needed. Included in the following pages are three schematics. ISL55141 single comparator device, ISL55142 dual comparator and ISL55143 quad comparator device. The Evaluation boards are laid out for the TSSOP packages for the ISL55141 and ISL55142, while the ISL55143 is the QFN package. Please refer to the device specification for part numbers/options for these and other package ordering. Bill of Material A bill of material of the ISL55142 evaluation board is included on page 6. It provides sources for special components such as the BNC connectors and banana jacks. All other parts are QPL standard passive components. Refer to device specification (FN6230) when ordering replacements for actual ISL55141, ISL55142 or ISL55143 devices. FIGURE 7. ISL55142 AND ISL55143 COMPARATOR THRESHOLD CVA/CVB INPUTS ARE TIED TOGETHER TO EITHER THE CVA_BUS OR CVB_BUS. QA0 2 QB0 3 QA1 4 VINP2 20 VINP0 26 CVB0 27 QB1 5 CVA2 19 QA2 6 QB2 7 QA3 8 QB3 9 CVA1 22 VINP1 23 CVA0 25 CVB1 24 CVB2 21 ISL55143_QFN CVB_BUS CVA_BUS Application Note 1270 |
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