HT46R01/HT46R02/HT46R03
A/D Transfer Function
bit analog input value of VDD/4096. The following graphs
show the ideal transfer function between the analog in-
put value and the digitised output value for the A/D con-
verters.
As the HT46R01 devices contain an 8-bit A/D converter,
their full-scale converted digitised value is equal to
0FFH. Since the full-scale analog input value is equal to
the VDD voltage, this gives a single bit analog input value
of VDD/256. For the HT46R02 devices, which contains a
9-bit A/D converter, their full-scale converted digitised
value is equal to 1FFH, giving a single bit analog input
value of VDD/512, while for the HT46R03 devices, which
contains a 12-bit A/D converter, their full-scale con-
verted digitised value is equal to FFFH, giving a single
Note that to reduce the quantisation error, a 0.5 LSB off-
set is added to the A/D Converter input. Except for the
digitised zero value, the subsequent digitised values will
change at a point 0.5 LSB below where they would
change without the offset, and the last full scale digitised
value will change at a point 1.5 LSB below the VDD level.
1
.
5
L
S
B
F
F
H
F
E
H
F
D
H
A
R
/
D
C
o
n
v
e
r
s
i
o
n
e
s
u
l
t
0
.
5
L
S
B
0
0
0
3
2
1
H
H
H
V
D
D
(
)
2
5
6
0
1
2
3
2
5
3
2
5
4
2
5
5
2
5
6
A
n
a
l
o
g
I
n
p
u
t
V
o
l
t
a
g
e
Ideal A/D Transfer Function - HT46R01
1
.
5
L
S
B
1
F
F
H
1
F
E
H
1
F
D
H
A
R
/
D
C
o
n
v
e
r
s
i
o
n
e
s
u
l
t
0
.
5
L
S
B
0
0
0
3
2
1
H
H
H
V
D
D
(
)
5
1
2
0
1
2
3
5
0
9
5
1
0
5
1
1
5
1
2
A
n
a
l
o
g
I
n
p
u
t
V
o
l
t
a
g
e
Ideal A/D Transfer Function - HT46R02
1
.
5
L
S
B
F
F
F
H
F
F
E
H
F
F
D
H
A
/
D
C
o
n
v
e
r
s
i
o
n
R
e
s
u
l
t
0
.
5
L
S
B
0
3
H
0
0
2
1
H
H
V
D
D
(
)
4
0
9
6
4
0
9
5
4
0
9
6
0
1
2
3
4
0
9
3
4
0
9
4
A
n
a
l
o
g
I
n
p
u
t
V
o
l
t
a
g
e
Ideal A/D Transfer Function - HT46R03
Rev. 1.00
32
September 21, 2007
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
