Rev.6.00 Oct.28.2004 page 554
of 1016
REJ09B0138-0600H
However, if a large capacitance is provided externally, the input load will essentially comprise only the internal input
resistance of 10 kohm, and the signal source impedance is ignored.
However, since a low-pass filter effect is obtained in this case, it may not be possible to follow an analog signal with a
large differential coefficient (e.g., 5 mV/
µ
s or greater).
When converting a high-speed analog signal, a low-impedance buffer should be inserted.
Influences on Absolute Precision: Adding capacitance results in coupling with GND, and therefore noise in GND may
adversely affect absolute precision. Be sure to make the connection to an electrically stable GND such as AV
SS
.
Care is also required to insure that filter circuits do not communicate with digital signals on the mounting board, so acting
as antennas.
A/D converter
equivalent circuit
H8/2357
Group
20 pF
C
in
=
15 pF
10 k
Ω
to 10 k
Ω
Low-pass
filter C
to 0.1
µ
F
Sensor output
impedance
Sensor input
Note: Values are reference values.
Figure 16-10 Example of Analog Input Circuit
Содержание ZTAT H8S/2357F
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