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M685 датащи(PDF) 7 Page - Integrated Circuit Systems |
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M685 датащи(HTML) 7 Page - Integrated Circuit Systems |
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7 / 7 page ![]() M685 Datasheet Rev 0.4 - Errata Revised 16Nov2004 Integr a t ed Cir cui t S ystems , Inc . ● N e tw or kin g & C o mm un icat ion s ● www. icst.com ● te l (5 08 ) 85 2-5 4 0 0 M685 DUAL SAW, SELECTABLE FREQUENCY VCSO Integrated Circuit Systems, Inc. Er rata PRODUCT APPLICATION CAUTION F_SEL Change During Power-Up Can Affect Output Frequency Accuracy M685E1 The M685 features an F_SEL input which is used to select the internal VCSO frequency. The F_SEL input logic level should not be changed while the M685 device is in operation (that is, voltage is applied to the pin VCC), particularly when the pin VIN (the control voltage input) is above 2.0V. Changing the F_SEL input logic level during operation may result in an erroneous output frequency. It is safe to change F_SEL during operation if pin VIN can be held low, or at least below 2.0V. |
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