參數(shù)資料
型號: L9700D
廠商: STMICROELECTRONICS
元件分類: 模擬信號調(diào)理
英文描述: SPECIALTY ANALOG CIRCUIT, PDSO8
封裝: SO-8
文件頁數(shù): 5/8頁
文件大小: 459K
代理商: L9700D
Figure 3 : Typical Application.
The minimum value for CIN is determined by the ac-
curacy required, the time taken to sample the input
and the input impedance during that time, while the
maximum value is determined by the required fre-
quency response and the value of RS.
Thus for a resistive input A/D connector where :
TS =
Sample time (Seconds)
RD =
Device input resistance (Ohms)
VIN =
Input voltage (Volts)
k
=
Required accuracy (%)
Q1 =
Charge on capacitor before sampling
Q2 =
Charge on capacitor after sampling
ID =
Device input current (Amps)
Thus :
k
Q1
Q1– Q2 =
100
but
Q1 = CIN VIN
and
Q1– Q2 = ID – TS
k
CIN – VIN
so that
ID TS =
100
ID
TS
and
CIN (min) =
Farad
VIN
k
100
TS
so
CIN (min) =
Farad
k
RD
The calculation for a sample and hold type convertor
is even simpler :
k
=
Required accuracy (%)
CH =
Hold capacitor (Farad)
100
CH
CIN (min) =
Farad
k
L9700
5/8
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