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| 型號： | 5962-9064202QRA |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 11-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP20 |
| 封裝： | CERAMIC, DIP-20 |
| 文件頁數(shù)： | 11/32頁 |
| 文件大?。?/td> | 770K |
| 代理商： | 5962-9064202QRA |
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SIMPLIFIED ANALOG INPUT ANALYSIS
VC = VS 1e
t c/RtCi
(
)
where
Rt = Rs + ri
(1)
VC (1/2 LSB) = VS (VS/2048)
(2)
VS (VS/2048) = VS 1e
(
)
t c/RtCi
and
tc (1/2 LSB) = Rt × Ci × ln(2048)
(3)
tc (1/2 LSB) = (Rs + 1 k) × 60 pF × ln(2048)
(4)
Rs
ri
VS
VC
1 k
MAX
Driving Source
TLC1542/3
Ci
50 pF MAX
VI
VI = Input Voltage at A0A10
VS = External Driving Source Voltage
Rs = Source Resistance
ri = Input Resistance
Ci = Equivalent 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.
SLAS052G – MARCH 1992 – REVISED JANUARY 2006
APPLICATION INFORMATION (continued)
Using the equivalent circuit in Figure 17Figure 17, 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
The final voltage to 1/2 LSB is given by
Equating equation 1 to equation 2 and solving for time tc gives
Therefore, with the values given the time for the analog input signal to settle is
This time must be less than the converter sample time shown in the timing diagrams.
Figure 17. Equivalent Input Circuit Including the Driving Source
19
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