參數(shù)資料
型號: TLC2543-EVM
廠商: Texas Instruments, Inc.
英文描述: TLC2543 Evaluation Module(TLC2543評估板)
中文描述: 器TLC2543評估模塊(器TLC2543評估板)
文件頁數(shù): 31/52頁
文件大小: 231K
代理商: TLC2543-EVM
Driving the Input of a Switched-Capacitor ADC
2-17
Hardware Description and Operation
transfer mode (sample period = 2
μ
s), the time constant should be no more
than:
1 9 x 2
s
0.22
s
(6)
Therefore,
C1(R
S
R1)
0.22
s
(7)
So,
(R
S
R1)
3.67 K
(8)
Since R
S
= 1 k , the source impedance should be less than 2.67 k
to stay
within 1/2 LSB error. Good design practice dictates that the source impedance
be as low as possible, such as the output of an op-amp. However, in an ap-
plication where fast conversion time is not critical, slow I/O clock rates can al-
low the driving source impedance to be relatively large.
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