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ADC0848 Datasheet(PDF) 11 Page - Texas Instruments |
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ADC0848 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 25 page ADC0844, ADC0848 www.ti.com SNAS523D – JUNE 1999 – REVISED MARCH 2013 THE ANALOG INPUTS Analog Differential Voltage Inputs and Common-Mode Rejection The differential input of these converters actually reduces the effects of common-mode input noise, a signal common to both selected “+” and “ −” inputs for a conversion (60 Hz is most typical). The time interval between sampling the “+” input and then the “ −” inputs is ½ of a clock period. The change in the common-mode voltage during this short time interval can cause conversion errors. For a sinusoidal common-mode signal this error is: where • fCM is the frequency of the common-mode signal • Vpeak is its peak voltage value • tC is the conversion time For a 60 Hz common-mode signal to generate a ¼ LSB error ( ≈5 mV) with the converter running at 40 μS, its peak value would have to be 5.43V. This large a common-mode signal is much greater than that generally found in a well designed data acquisition system. Table 2. ADC0848 MUX Addressing(1) MUX Address Channel CS WR RD MUX Mode MA4 MA3 MA2 MA1 MA0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8 AGND X L L L L L H + − X L L L H L H − + X L L H L L H + − X L L H H L NP H − + Differential X L H L L L H + − X L H L H L H − + X L H H L L H + − X L H H H L H − + L H L L L L H + − L H L L H L H + − L H L H L L H + − L H L H H L NP H + − Single-Ended L H H L L L H + − L H H L H L H + − L H H H L L H + − L H H H H L H + − H H L L L L H + − H H L L H L H + − H H L H L L H + − Pseudo- H H L H H L NP H + − Differential H H H L L L H + − H H H L H L H + − H H H H L L H + − X X X X X L L Previous Channel Configuration (1) X = don't care, NP = negative pulse Copyright © 1999–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: ADC0844 ADC0848 |
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