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7106L-QM1-Y Datasheet(PDF) 8 Page - Unisonic Technologies |
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7106L-QM1-Y Datasheet(HTML) 8 Page - Unisonic Technologies |
8 / 18 page 7106 CMOS IC UNISONICTECHNOLOGIESCO.,LTD 8 of 18 www.unisonic.com.tw QW-R502-018.E DETAILED DESCRIPTION(Cont.) DIFFERENTIAL REFERENCE The reference voltage can be generated anywhere within the power supply voltage of the converter. The main source of common mode error is a roll-over voltage caused by the reference capacitor losing or gaining charge to stray capacity on its nodes. If there is a large common mode voltage, the reference capacitor can gain charge (increase voltage) when called up to de-integrate a positive signal but lose charge (decrease voltage) when called up to de-integrate a negative input signal. This difference in reference for positive or negative input voltage will give a roll-over error. However, by selecting the reference capacitor such that it is large enough in comparison to the stray capacitance, this error can be held to less than 0.5 count worst case. (See Component Value Selection) COMMON IN LO 30 32 31 V+ A-Z INT INT A-Z AND DE(±) V- Fig.1 Analog Section DE+ DE- DE- DE+ A-Z A-Z REF HI REF LO CREF + STRAY CREF 34 36 35 33 28 1 2.8V - + - + - + 29 27 INT A-Z CINT CAZ INTEGRATOR RINT V+ STRAY CREF - TO DIGITAL SECTION A-Z COMPARATOR INPUT LOW - + N INPUT HIGH 6.2V 10 A IN HI μ BUFFER |
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Similar Description - 7106L-QM1-Y |
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