Application information

L9700D-E

10/14

Doc ID 022301 Rev 1

impedance during the sampling period.

sample the input and the input impedance during that time, while the maximum value is

Thus for a resistive input A/D connector where:

k = required accuracy (%)

Thus:

so that

and

so

The calculation for a sample and hold type convertor is even simpler:

k = required accuracy (%)

Q

1

Q

2

–

kQ

1

⋅

100

---------------

=

I

kC

IN

V

IN

–

⋅

100

---------------------------------

=

C

()

I

⋅

V

⋅

-----------------Farad

=

C

()

100 T

S

⋅

kR

D

⋅

---------------------Farad

=

C

()

100 C

H

⋅

k

----------------------Farad

=