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TLC542CDWG4 Datasheet(PDF) 8 Page - Texas Instruments |
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TLC542CDWG4 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 13 page TLC542C, TLC542I 8-BIT ANALOG-TO-DIGITAL CONVERTERS WITH SERIAL CONTROL AND 11 INPUTS SLAS075C – FEBRUARY 1989 – REVISED JUNE 2001 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION simplified analog input analysis Using the equivalent circuit in Figure 8, the time required to charge the analog input capacitance from 0 to VS within 1/2 LSB can be derived as follows: The capacitance charging voltage is given by VC = VS 1–e – tc/RtCi ( ) (1) where Rt = Rs + ri The final voltage to 1/2 LSB is given by (2) VC (1/2 LSB) = VS – (VS/512) Equating equation 1 to equation 2 and solving for time tc gives VS –(VS/512) = VS 1–e ( ) (3) – tc/RtCi and tc (1/2 LSB) = Rt × Ci × ln(512) (4) 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(512) This time must be less than the converter sample time shown in the timing diagrams. Rs ri VS VC 50 pF MAX 1 k Ω MAX Driving Source† TLC542 Ci VI VI = Input Voltage at INPUT A0 – A10 VS = External Driving Source Voltage Rs = Source Resistance ri = Input Resistance Ci = Input Capacitance † 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. Figure 8. Equivalent Input Circuit Including the Driving Source |
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