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DOC4106 датащи(PDF) 27 Page - ATMEL Corporation |
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DOC4106 датащи(HTML) 27 Page - ATMEL Corporation |
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27 / 47 page ![]() 27 AT8xC51SND1C 4106F–8051–10/02 A-to-D Converter Oscillator and Crystal Schematic Figure 12. Crystal Connection Note: For operation with most standard crystals, no external components are needed on X1 and X2. It may be necessary to add external capacitors on X1 and X2 to ground in spe- cial cases (max 10 pF). X1 and X2 may not be used to drive other circuits. Parameters Table 36. Oscillator and Crystal Characteristics VDD = 2.7 to 3.3V , TA =-40° to +85°C Table 35. A-to-D Converter DC Characteristics V DD = 2.7 to 3.3V , TA =-40° to +85°C Symbol Parameter Min Typ Max Units Test Conditions A V DD Analog Supply Voltage 2.7 3.3 V AI DD Analog Operating Supply Current 600 µA A V DD =3.3V AIN1:0 = 0 to A VDD AIPD Analog Standby Current 2 µA A VDD =3.3V ADEN = 0 or PD = 1 AVIN Analog Input Voltage AVSS A VDD V AV REF Reference Voltage A REFN AREFP AV SS 2.4 A VDD V V RREF AREF Input Resistance 10 30 k Ω TA =25°C CIA Analog Input capacitance 10 pF TA =25°C VSS X1 X2 Q C1 C2 Symbol Parameter Min Typ Max Unit CX1 Internal Capacitance (X1 - VSS) 10 pF CX2 Internal Capacitance (X2 - VSS) 10 pF CL Equivalent Load Capacitance (X1 - X2) 5 pF DL Drive Level 50 µW F Crystal Frequency 20 MHz RS Crystal Series Resistance 40 Ω CS Crystal Shunt Capacitance 6 pF |
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