參數(shù)資料
型號(hào): L9700D
英文描述: Analog IC
中文描述: 模擬IC
文件頁數(shù): 5/8頁
文件大?。?/td> 61K
代理商: L9700D
Figure3 :
Typical Application.
TheminimumvalueforC
IN
is determinedby theac-
curacyrequired,the time takento sampletheinput
and theinputimpedanceduringthattime,whilethe
maximum value is determined by the required fre-
quencyresponseand the value of R
S
.
Thus fora resistiveinputA/D connectorwhere :
T
S
=
Sampletime (Seconds)
R
D
=
Deviceinput resistance(Ohms)
V
IN
=
Inputvoltage(Volts)
k
=
Requiredaccuracy (%)
Q
1
=
Chargeon capacitorbeforesampling
Q
2
=
Chargeon capacitoraftersampling
I
D
=
Deviceinput current(Amps)
Thus :
k
Q
1
Q
1
– Q
2
=100
but
Q
1
=C
IN
V
IN
and
Q
1
– Q
2
= I
D
– T
S
k
C
IN
– V
IN
100
I
D
T
S
V
IN
k
100
T
S
k
R
D
so that
I
D
T
S
=
and
C
IN
(min)=
Farad
so
C
IN
(min)=
Farad
Thecalculationforasampleandholdtypeconvertor
is evensimpler :
k
=
Requiredaccuracy(%)
C
H
=
Holdcapacitor(Farad)
100
C
H
k
C
IN
(min)=
Farad
L9700
5/8
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