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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SPC58ECX датащи(PDF) 47 Page - STMicroelectronics |
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SPC58ECX датащи(HTML) 47 Page - STMicroelectronics |
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47 / 153 page  DS11620 Rev 8 47/153 SPC584Cx, SPC58ECx Electrical characteristics 55 4.12 ADC system 4.12.1 ADC input description Figure 8 shows the input equivalent circuit for SARn and SARB channels. Figure 8. Input equivalent circuit (Fast SARn and SARB channels) All specifications in the following table are valid for the full input voltage range for the analog inputs. RSW1 CP2 CS VDD Sampling INTERNAL CIRCUIT SCHEME RSW1: Channel Selection Switch Impedance RAD: Sampling Switch Impedance CP: Pin Capacitance (two contributions, CP1 and CP2) CS: Sampling Capacitance RCMSW: Common mode switch RCMRL: Common mode resistive ladder VCM: Common mode voltage (~0.5 VDD) CEXT: External capacitance CP1 RAD Channel Selection Common mode switch Common mode resistive ladder The above scheme can be used as approximation circuitry for external filtering definition. VCM RCMSW RCMRL CEXT VSS_HV_ADR Table 26. ADC pin specification Symbol C Parameter Conditions Value Unit Min Max R20KΩ CC D Internal voltage reference source impedance. —16 30 K Ω ILKG CC — Input leakage current, two ADC channels on input-only pin. See IO chapter Table 11: I/O input electrical characteristics , parameter ILKG. IINJ1 SR — Injection current on analog input preserving functionality at full or degraded performances. See Operating Conditions chapter Table 5: Operating conditions , IINJ1 parameter. CHV_ADC SR D VDD_HV_ADV external capacitance. See Power Management chapter Table 34: External components integration , CADC parameter. CP1 CC D Pad capacitance See IO chapter Table 11: I/O input electrical characteristics , parameter CP1. |
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