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TLC2543M Datasheet(PDF) 21 Page - Texas Instruments |
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TLC2543M Datasheet(HTML) 21 Page - Texas Instruments |
21 / 28 page TLC2543Q1 12BIT ANALOGTODIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 ANALOG INPUTS SGLS218D − NOVEMBER 2003 − REVISED MAY 2008 21 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION simplified analog input analysis Using the equivalent circuit in Figure 18, the time required to charge the analog input capacitance from 0 V to VS within 1/2 LSB can be derived as follows: The capacitance charging voltage is given by: (1) Where: Rt = Rs + ri V C + V S 1–e –tc RtCi The final voltage to 1/2 LSB is given by: (2) VC (1/2 LSB) = VS − (VS/8192) Equating equation 1 to equation 2 and solving for time tc gives: (3) and tc (1/2 LSB) = Rt × Ci × ln(8192) (4) V S * V S 8192 + V S 1–e –tc RtCi Therefore, with the values given, the time for the analog input signal to settle is: (5) tc (1/2 LSB) = (Rs + 1 kΩ) × 60 pF × ln(8192) This time must be less than the converter sample time shown in the timing diagrams. Rs ri VS VC 60 pF Max 1 k Ω Max Driving Source† TLC2543 Ci VI VI = Input Voltage at AIN VS = External Driving Source Voltage Rs = Source Resistance ri = Input Resistance Ci = Input Capacitance VC= Capacitance Charging Voltage † Driving source requirements: • Noise and distortion for the source must be equivalent to the resolution of the converter. • Rs must be real at the input frequency. • Rs must not exceed 1 kΩ. Figure 18. Equivalent Input Circuit Including the Driving Source |
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