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PDF L9700 Data sheet ( Hoja de datos )
| Número de pieza | L9700 | |
| Descripción | HEX PRECISION LIMITER | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de L9700 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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® L9700
HEX PRECISION LIMITER
. HIGH PERFORMANCE CLAMPING AT
GROUND AND POSITIVE REFERENCE
VOLTAGE
. FAST ACTIVE CLAMPING
. OPERATING RANGE 4.75 - 5.25 V
. SINGLE VOLTAGE FOR SUPPLY AND POSITI-
)VE REFERENCE
. t(sLOW QUIESCENT CURRENT
. cLOW INPUT LEAKAGE CURRENT
ProduDESCRIPTION
leteThe L9700 is a monolithic circuit which is suited for
input protection and voltage clamping purpose.
soThe limiting function is referred to ground and the
bpositive supply voltage.
OOne single element contains six independent chan-
-nels.
t(s)Very fast speed is achieved by internal feedback
and the application of a new vertical PNP-transistor
cwith isolated collector.
Obsolete ProduBLOCK DIAGRAM
MINIDIP
SO8
ORDERING NUMBERS: L9700 (DIP)
L9700D (SO8)
September 2000
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1
1 page  
Figure 3 : Typical Application.
L9700
solete Product(s)The minimum value for CIN is determined by the ac-
bcuracy required, the time taken to sample the input
Oand the input impedance during that time, while the
-maximum value is determined by the required fre-
)quency response and the value of RS.
t(sThus for a resistive input A/D connector where :
cTS = Sample time (Seconds)
duRD = Device input resistance (Ohms)
roVIN = Input voltage (Volts)
Pk = Required accuracy (%)
teQ1 = Charge on capacitor before sampling
leQ2 = Charge on capacitor after sampling
oID = Device input current (Amps)
ObsThus :
k ⋅ Q1
Q1– Q2 = 100
but Q1 = CIN VIN
and Q1– Q2 = ID – TS
so that
and
so
k ⋅ CIN – VIN
ID TS =
100
ID ⋅ TS
CIN (min) = VIN ⋅ k Farad
100 ⋅ TS
CIN (min) = k ⋅ RD Farad
The calculation for a sample and hold type convertor
is even simpler :
k = Required accuracy (%)
CH = Hold capacitor (Farad)
100 ⋅ CH
CIN (min) = k
Farad
5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet L9700.PDF ] | |
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