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AD7873 データシート(PDF) 15 Page - Analog Devices |
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AD7873 データシート(HTML) 15 Page - Analog Devices |
15 / 29 page AD7873 Data Sheet Rev. F | Page 14 of 28 ANALOG INPUT Figure 26 shows an equivalent circuit of the analog input structure of the AD7873 that contains a block diagram of the input multiplexer, the differential input of the ADC, and the differential reference. Table 6 shows the multiplexer address corresponding to each analog input, both for the SER/DFR bit in the control register set high and low. The control bits are provided serially to the device via the DIN pin. For more information on the control register, see the Control Register section. When the converter enters hold mode, the voltage difference between the +IN and –IN inputs (see Figure 26) is captured on the internal capacitor array. The input current on the analog inputs depends on the conversion rate of the device. During the sample period, the source must charge the internal sampling capacitor (typically 37 pF). Once the capacitor is fully charged, there is no further input current. The rate of charge transfer from the analog source to the converter is a function of conversion rate. Figure 26. Equivalent Analog Input Circuit Table 6. Analog Input, Reference, and Touch Screen Control A2 A1 A0 SER/ DFR Analog Input X Switches Y Switches +REF1 –REF1 0 0 0 1 TEMP0 Off Off VREF GND 0 0 1 1 X+ Off On VREF GND 0 1 0 1 VBAT Off Off VREF GND 0 1 1 1 X+ (Z1) X+ Off Y+ On VREF GND X– On Y– Off 1 0 0 1 Y– (Z2) X+ Off Y+ On VREF GND X– On Y– Off 1 0 1 1 Y+ On Off VREF GND 1 1 0 1 AUX Off Off VREF GND 1 1 1 1 TEMP1 Off Off VREF GND 0 0 0 0 Invalid Address. Test Mode: Switches out the TEMP0 diode to the PENIRQ pin. 0 0 1 0 X+ Off On Y+ Y– 0 1 0 0 Invalid Address 0 1 1 0 X+ (Z1) X+ Off Y+ On Y+ X– X– On Y– Off 1 0 0 0 Y– (Z2) X+ Off Y+ On Y+ X– X– On Y– Off 1 0 1 0 Y+ ON Off X+ X– 1 1 0 0 Outputs Identity Code, 1000 0000 0000. 1 1 1 0 Invalid address. Test mode: Switches out the TEMP1 diode to the PENIRQ pin. 1 Internal node, not directly accessible by the user. X+ Y+ REF INT/ EXT X– Y– GND 6-TO-1 MUX 3-TO-1 MUX 3-TO-1 MUX IN+ IN+ IN– REF– REF+ ADC CORE DATA OUT VCC Y– Y+ X+ X– ON-CHIP SWITCHES X+ Y+ Y– VBAT AUX TEMP |
同様の部品番号 - AD7873_17 |
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同様の説明 - AD7873_17 |
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