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ADC0854 Datasheet(PDF) 10 Page - Texas Instruments |
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ADC0854 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 22 page Functional Description 1 1 The Sampled-data Comparator The ADC0852 and ADC0854 utilize a sampled-data com- parator structure to compare the analog difference between a selected ‘‘a’’ and ‘‘b’’ input to an 8-bit programmable threshold This comparator consists of a CMOS inverter with a capaci- tively coupled input ( Figure 4 ) Analog switches connect the two comparator inputs to the input capacitor and also con- nect the inverter’s input and output This device in effect now has one differential input pair A comparison requires two cycles one for zeroing the comparator and another for making the comparison FIGURE 4 Sampled-Data Comparator In the first cycle ( Figure 4a ) one input switch and the invert- er’s feedback switch are closed In this interval the input capacitor (C) is charged to the connected input (V1) less the inverter’s bias voltage (VB approx 12 volts) In the second cycle ( Figure 4b ) these two switches are opened and the other (V2) input’s switch is closed The input capacitor now subtracts its stored voltage from the second input and the difference is amplified by the inverter’s open loop gain The inverter input (VB’) becomes VB b (V1 b V2) C C a CS and the output will go high or low depending on the sign of VB’- VB TLH5521 – 8 FIGURE 4a Zeroing Phase V0 e VB VonC e V1–VB CS e Stray Input Node Cap VB e Inverter Input Bias Voltage TLH5521 – 9 FIGURE 4b Compare Phase VB bVB e (V2bV1) C CaCS V0 e b A Ca CS CV2bCV1 V0 is dependent on V2bV1 TLH5521 – 14 V0 e b A C1 a C2 a CS C1 (V2 b V1) a C2 (V4 b V3) e b A C1 a C2 a CS D QC1 a D QC2 Comparator Reads VTH from Internal DAC Differentially FIGURE 4c Multiple Differential Inputs 9 |
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Similar Description - ADC0854 |
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