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參數(shù)資料
| 型號： | MB4053PF |
| 廠商： | FUJITSU LTD |
| 元件分類： | ADC |
| 英文描述： | 6-Channel 8-BIT A/D Converter |
| 中文描述： | 6-CH 8-BIT SINGLE-SLOPE ADC, SERIAL ACCESS, PDSO16 |
| 封裝： | PLASTIC, SOP-16 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大?。?/td> | 135K |
| 代理商： | MB4053PF |
11
MB4053
I
ZERO OFFSET AND FULL-SCALE FACTOR CORRECTIONS
High precision conversions can be achieved by correcting for zero offset and full scale factor as follows:
The channel select address (A
0
to A
2
) is set to 000. Ground (GND) is selected (internally) as the analog input
and converted. This results in ramp time t
R
. Next the address is set to 111. V
REF
is selected (internally) and
converted. This results in ramp time, t
REF
. Finally the desired analog input (one of I
1
to I
6
) is selected and converted.
This results in ramp time t
X
. This conversion sequence is arbitrary and the GND and V
REF
conversions are not
needed each time a channel is converted but only as required for calibration. The relationships between the
inputs and ramp times are shown below.
(V
BE1
)
C
= t
Z
(V
REF
+ V
BE1
)
C
= t
REF
(V
IN
+ V
BE1
)
C
= t
X
(V
REF
)
C
= t
REF
– t
Z
(V
IN
)
C
= t
X
– t
Z
The conversion error can then be minimized by using the above results in the expression below to calculate the
corrected analog input voltage.
t
X
– t
Z
t
REF
– t
Z
The GND and V
REF
conversion sequence is arbitary, the GND and V
REF
conversions not being needed each time
a channel (I
1
to I
6
) is converted.
V
CH
V
REF
+ V
BE1
V
IN
+ V
BE1
V
BE1
V
BE2
t
Z
t
X
t
REF
=
(V
IN
)
C
(V
REF
)
C
t
X
– t
Z
t
REF
– t
Z
t
R
(V
IN
)
C
= (V
REF
)
C
×
Where: V
IN
= Analog input voltage to be measured
V
REF
= Reference voltage
V
BE1
= Shift voltage in sample/ramp amplifer
V
BE2
= Threshold voltage of comparator
V
CH
= C
H
voltage
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