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參數(shù)資料
| 型號： | TLC1550INW |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 1-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDIP24 |
| 封裝： | PLASTIC, DIP-24 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 309K |
| 代理商： | TLC1550INW |
TLC1550I, TLC1550M, TLC1551I
10BIT ANALOGTODIGITAL CONVERTERS
WITH PARALLEL OUTPUTS
SLAS043G MAY 1991 REVISED NOVEMBER 2003
8
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
1e
–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 k) × 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
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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| TLC1550M | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-BIT ANALOG-TO-DIGITAL CONVERTERS WITH PARALLEL OUTPUTS |
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