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ADC1225CCD-1 bảng dữ liệu(PDF) 5 Page - National Semiconductor (TI) |
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ADC1225CCD-1 bảng dữ liệu(HTML) 5 Page - National Semiconductor (TI) |
5 / 18 page AC Electrical Characteristics (Continued) Note 4 Two on-chip diodes are tied to each analog input as shown below TLH5676 – 4 Errors in the AD conversion can occur if these diodes are forward biased more than 50 mV This means that if AVCC and DVCC are minimum (475 VDC) and Vb is minimum (b475VDC) full-scale must be s 48VDC Note 5 A diode exists between analog VCC and digital VC TLH5676 – 20 To guarantee accuracy it is required that the AVCC and DVCC be connected together to a power supply with separate bypass filters at each VCC pin Note 6 A diode exists between analog ground and digital ground TLH5676 – 21 To guarantee accuracy it is required that the analog ground and digital ground be connected together externally Note 7 Accuracy is guaranteed at fCLKe10 MHz At higher clock frequencies accuracy may degrade Note 8 Typicals are at 25 C and represent most likely parametric norm Note 9 Tested and guaranteed to National’s AOQL (Average Outgoing Quality Level) Note 10 Guaranteed but not 100% production tested These limits are not used to calculate outgoing quality levels Note 11 Linearity error is defined as the deviation of the analog value expressed in LSBs from the straight line which passes through positive full scale and zero after adjusting zero error (See Figures 1b and 1c ) Note 12 Human body model 100 pF discharged through a 15 kX resistor TLH5676 – 8 FIGURE 1a Transfer Characteristic 5 |
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