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TLC1551IJ Folha de dados(PDF) 7 Page - Texas Instruments |
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TLC1551IJ Folha de dados(HTML) 7 Page - Texas Instruments |
7 / 9 page TLC1550I, TLC1550M, TLC1551I 10-BIT ANALOG-TO-DIGITAL CONVERTERS WITH PARALLEL OUTPUTS SLAS043C – MAY 1991 – REVISED MARCH 1995 2–7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION simplified analog input analysis Using the circuit in Figure 2, 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 (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/1024) Equating equation 1 to equation 2 and solving for time t c gives (3) and t c (1/2 LSB) = Rt × Ci × ln(1024) (4) V S * V S 512 + V S 1– e –tc RtCi Therefore, with the values given, the time for the analog input signal to settle is (5) t c (1/2 LSB) = (Rs + 1 kΩ) × 60 pF × ln(1024) This time must be less than the converter sample time shown in the timing diagrams. Rs ri VS VC Ci 50 pF MAX 1 k Ω MAX Driving Source† TLC1550/1 VI VI = Input voltage at AIN 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 2. Input Circuit Including the Driving Source |
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