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Renesas PROM Programming Adapters PCA7438F-64A Spezifikationen Seite 29

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Seitenansicht 28
Rev.2.40 Jun 14, 2004 page 29 of 56
38C1 Group
Definition of A/D converter accuracy
The A/D conversion accuracy is defined below (refer to Figure 28).
• Relative accuracy
➀ Zero transition voltage (V
0T)
This means an analog input voltage when the actual A/D conver-
sion output data changes from “0” to “1.”
➁ Full-scale transition voltage (VFST)
This means an analog input voltage when the actual A/D conver-
sion output data changes from “255” to ”254.”
➂ Linearity error
This means a deviation from the line between V0T and VFST of a
converted value between V0T and VFST.
➃ Differential non-linearity error
This means a deviation from the input potential difference re-
quired to change a converter value between V0T and VFST by 1
LSB at the relative accuracy.
• Absolute accuracy
This means a deviation from the ideal characteristics between 0 to
V
REF
(V
CC
in 38C1 Group) of actual A/D conversion characteristics.
V
REF
(V
CC
)
V
254
V
n
V
1
V
0
V
n+1
n
+
1
n
2
5
4
255
1
0
b
a
c
O
u
t
p
u
t
d
a
t
a
Differential non-linearity error =
Linearity error =
[LSB]
c
a
b–a
a
[
L
S
B
]
Actual A/D conversion
characteristics
a
:
1
L
S
B
b
y
r
e
l
a
t
i
v
e
a
c
c
u
r
a
c
y
b
:
V
n
+
1
–
V
n
c
:
D
i
f
f
e
r
e
n
c
e
b
e
t
w
e
e
n
i
d
e
a
l
V
n
a
n
d
a
c
t
u
a
l
V
n
Zero transition voltage (V
0T
)
Analog voltage
Full-scale transition voltage (V
FST
)
Ideal line of A/D conversion
between V
0
–V
254
Fig. 28 Definition of A/D conversion accuracy
VFST–V0T
254
VREF*
256
Vn: Analog input voltage when the output data changes from “n” to
“n+1” (n = 0 to 254)
• 1LSB at relative accuracy → (V)
• 1LSB at absolute accuracy → (V)
* VREF = VCC in the 38C1 Group.
Seitenansicht 28
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