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參數(shù)資料
| 型號(hào)： | ZN447J |
| 英文描述： | Converter IC |
| 中文描述： | 轉(zhuǎn)換器IC |
| 文件頁(yè)數(shù)： | 15/18頁(yè) |
| 文件大?。?/td> | 289K |
| 代理商： | ZN447J |
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ZN448/9
15
BIPOLAR OPERATION
For bipolar operation the input to the ZN448/9 is offset by half
full-scale by connecting a resistor R
3
between V
REF IN
and V
IN
(Fig.18).
Fig.18 Basic bipolar input connection
R1
R3
R2
GROUND
7
9
6
ZN448/9
VIN
AIN
VREF IN
When A
IN
= -FS, V
IN
needs to be equal to zero.
When A
IN
= +FS, V
IN
needs to be equal to V
REF IN
.
If the full-scale range is
±
G. V
then R
1
= (G - 1). R
2
and
R
1
= G. R
3
fulfil the required conditions.
To match the ladder resistance, R
1
/R
2
/R
3
(=R
IN
) = 4k.
Thus the nominal values of R
1
, R
2
, R
3
are given by R
1
= 8 Gk,
R
2
= 8G/(G - 1)k, R
3
= 8k.
A bipolar range of
±
V
REF IN
(which corresponds to the basic
unipolar range 0 to +V
REF IN
) results if R
1
= R
3
= 8k and R
2
=
∞
.
Assuming the V
= 2.5V the nominal values of resistors for
±
5 and
±
10V input ranges are given in the following table.
R
2
16k
10.66k
R
1
16k
32k
G
2
4
Input range
+5V
+10V
Minus full-scale (offset) is set by adjusting R
about its nominal
value relative to R
3
. Plus full-scale (gain) is set by adjusting R
2
relative to R
1
.
Practical circuit realisations are given in Fig.19.
R
3
8k
8k
Note that in the
±
5V case R
has been chosen as 7.5k (instead
of 8.2k) to obtain a more symmetrical range of adjustment
using standard potentiometers.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZN448 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT MICROPROCESSOR COMPATIBLE A-D CONVERTER |
| ZN448D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Converter IC |
| ZN448E | 制造商:GPS 功能描述: |
| ZN448J | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Converter IC |
| ZN449 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-BIT MICROPROCESSOR COMPATIBLE A-D CONVERTER |
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