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参数资料
| 型号： | RC4200MT |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 模拟运算功能 |
| 中文描述： | ANALOG MULTIPLIER OR DIVIDER, PDSO8 |
| 封装： | SOIC-8 |
| 文件页数： | 23/25页 |
| 文件大小： | 265K |
| 代理商： | RC4200MT |
PRODUCT SPECIFICATION
RC4200
REV. 1.2.1 6/14/01
7
Extended Range Divider
Figure 6. Extended Range Divider
As with the extended range multiplier, resistors Raz and Rao
are added to cancel the cross-product error caused by the
biasing resistors, i.e.
To cancel cross-product and arithmetic offset:
RaoRb = R0Rd, RazRb = R4Rc and RaRb = RcRd
and the result is:
65-4200-08
RC4200
Multiplier
VX
(Input)
S
O
S
ao
az
Ra
Rb
R1
R
-V
I3
R
VO
(Output)
+V
S
-V
3
6
4
5
8
7
1
2
Rc
Rd
I2
I1
I4
+VREF
RC5534
VZ
(Output)
R4
V
X
R
1
--------
V
0
R
ao
----------
+
V
Z
R
az
----------
V
REF
R
a
----------------
+
VREF
R
b
----------------
V
0
R
0
-------
V
REF
R
C
----------------
+
VZ
R
4
--------
V
REF
R
D
----------------
+
=
V
X
V
REF
R
1
R
b
-------------------------
V
0
V
REF
R
ao
R
b
------------------------
V
Z
V
REF
R
az
R
b
-------------------------
V
REF
2
R
a
R
b
----------------
=
++
+
V
0
V
Z
R
0
R
4
----------------
V
0
V
REF
R
0
R
d
------------------------
V
Z
V
REF
R
4
R
c
-------------------------
V
REF
2
R
c
R
d
----------------
++
+
V
XVREF
R
1Rb
----------------------
V
0VZ
R
0R4
-------------- or V
0 =
V
X
V
ZK
------------
=
where K =
V
REFR0R4
R
1Rb
----------------------------
Notice that it is necessary to match the above resistor cross-
products to within the amount of error tolerable in the out-
put offset, i.e., with a 10V F.S. output, 0.1% resistor cross-
product match will give 0.1% x 10V. untrimmable output
offset voltage.
Resistor Values
Inputs:
VX(min.)
≤ VX ≤ VX(max.)
VX = VX(max.) = VX(min.)
VZ(min.)
≤ VZ ≤ VZ(max.)
VZ = VZ(max.) = VZ(min.)
VREF = Constant (+7V to +18V)
Outputs:
V0 (min.)
≤ V0 ≤ V0 (max.)
V0 = V0 (max.) = V0 (min.)
K
V
0VZ
V
X
-------------- Design Requirement
()
=
R
0
V
0
750
A
-----------------, R
b
V
REF
250
A
------------------, R
4
V
Z
200
A
-----------------
==
=
R
c
V
0VREF
750
AV
0
700
AV
0 max.
()
–
------------------------------------------------------------------------------
=
R
d
V
XVREF
250
AV
Z
200
AV
Z max.
()
–
-------------------------------------------------------------------------------
=
R
a
R
cRd
R
b
-------------, R
az
R
cR4
R
b
-------------, R
ao
R
0Rd
R
b
-------------
==
=
R
1
V
0VZ
600
AK
----------------------
=
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