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ADC0816CCJ Folha de dados(PDF) 11 Page - National Semiconductor (TI) |
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ADC0816CCJ Folha de dados(HTML) 11 Page - National Semiconductor (TI) |
11 / 13 page Applications Information (Continued) 3.0 CONVERTER EQUATIONS The transition between adjacent codes N andN+1is given by: (2) The center of an output code N is given by: (3) The output code N for an arbitrary input are the integers within the range: (4) where: V IN = Voltage at comparator input V REF = Voltage at Ref(+) V REF = Voltage at Ref(−) V TUE = Total unadjusted error voltage (typically V REF(+) ÷512) 4.0 ANALOG COMPARATOR INPUTS The dynamic comparator input current is caused by the periodic switching of on-chip stray capacitances These are connected alternately to the output of the resistor ladder/ switch tree network and to the comparator input as part of the operation of the chopper stabilized comparator. The average value of the comparator input current varies directly with clock frequency and with V IN as shown in Figure 6. If no filter capacitors are used at the analog or comparator inputs and the signal source impedances are low, the com- parator input current should not introduce converter errors, as the transient created by the capacitance discharge will die out before the comparator output is strobed. If input filter capacitors are desired for noise reduction and signal conditioning they will tend to average out the dynamic comparator input current. It will then take on the character- istics of a DC bias current whose effect can be predicted conventionally. See AN-258 for further discussion. DS005277-15 FIGURE 13. Symmetrically Centered Reference www.national.com 11 |
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Descrição semelhante - ADC0816CCJ |
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