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TLC1541IDWG4 Datasheet(PDF) 8 Page - Texas Instruments |
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TLC1541IDWG4 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 16 page TLC1541 10-BIT ANALOG-TO-DIGITAL CONVERTER WITH SERIAL CONTROL AND 11 INPUTS SLAS073C – DECEMBER 1995 – REVISED AUGUST 1996 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION simplified analog input analysis Using the equivalent circuit in Figure 2, 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 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/2048) Equating equation 1 to equation 2 and solving for time (tc) gives VS –(VS/2048) = VS 1–e ( ) (3) –tc/RtCi and tc (1/2 LSB) = Rt × Ci × ln(2048) (4) Therefore, with the values given, the time for the analog input signal to settle is (5) tc (1/2 LSB) = (Rs + 1 kΩ) × 55 pF × ln(2048) This time must be less than the converter sample time shown in the timing diagrams. 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 levels for the source must be at least equivalent to the resolution of the converter. • Rs must be real at the input frequency. Rs ri VS VC 55 pF MAX 1 k Ω MAX Driving Source† TLC1541 Ci VI Figure 2. Equivalent Input Circuit Including the Driving Source |
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