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| 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： | 5/25页 |
| 文件大小： | 265K |
| 代理商： | RC4200MT |
PRODUCT SPECIFICATION
RC4200
REV. 1.2.1 6/14/01
13
Appendix 1—System Errors
There are four types of accuracy errors which affect overall
system performance. They are:
Nonimearity—Incremental deviation from absolute
accuracy. See Note 1.
Scaling Error—Linear deviation from absolute accuracy.
Output Offset—Constant deviation from absolute
accuracy.
Feedthrough.—Cross-product errors caused by input
offsets and external circuit limitations. See Note 2.
This nonlinearity error in the transfer function of the
RC4200 is ±0.1% maximum (±0.03 maximum for the
RC4200A). That is,
The other system errors are caused by voltage offsets on the
inputs of the RC4200 and can be as high as ±3.0% (±2.0%
for RC4200A).
Figure 12.
Notes:
1. The input circuits tend to become unstable at
I1, I2, I4 < 50 A and linearity decreases when I1, I2, I4 >
250 A (e.g., @ I1 = I2 = 500A nonlinearity error
≈ 0.5%).
2. This section will not deal with feedthrough which is
proportional to frequency of operation and caused by stray
capacitance and/or bandwidth limitations. (refer to
Figure 12.)
3. Not including resistor tolerance or output offset on the
operational amplifier.
4. For 50 A
≤ I1, I2, I4 ≤ 250 A.
I
3
I
1I2
I
4
--------- 0.1% F.S. 4
()
±
=
V
0
V
XVY
V
Z
----------------
R
0R4
R
1R2
------------- 3.0% F.S. 3
() 4
()
±
=
65-1871
RC4200
Multiplier
V
S
X
Y
OS
O
S
R1
R2
-V
I3
R
V
+V
3
6
4
5
8
7
1
2
I2
I1
I4
V
Z
R4
Ideal Op-Amp
V
= 0
O
Errors Caused by Input Offsets
System errors can be greatly reduced by externally trimming
the input offset voltages of the RC4200. (±3.0% F.S. for
RC4200 and ±0.1% for RC4200A.)
If XOS = XOSX, YOS = YOSY, ZOS = -VOSZ,
Figure 13. RC4200 with Input Offset Adjustment
Extended Range Circuit Errors
The extended range congurations have a disadvantage in
that additional accuracy errors may be introduced by resistor
product mismatching.
Multiplier
An error in resistor product matching will cause an
equivalent feedthrough or output offset error. See Figure 6.
R1Rb = RCXRd ±
α, VX feedthrough (VY = 0) = IαVX
R2Ra = RCYRd ±
β, VY feedthrough (VX = 0) = ±βVY
RaRb = RCRd ±
γ, V0 offset (VX = VY = 0) = ±γVREF*
Note:
*
Output offset errors can always be trimmed out with the
output op amp offset adjust, VOS (R16).
V0 =
VY Feedthrough
VX Feedthrough
Scaling Error
Output Offset Error
VYVOSX ± VXVOSY ± V0VOSZ ± VOSXVOSY
±
R0R4
VXVY
VZ
1
VZ
65-1870
RC4200
Multiplier
V
S
X
Y
OS
O
R1
R2
-V
R
V
3
6
4
5
8
7
1
2
V
Z
R4
Ideal Op-Amp
V
= 0
O
R1
R2
S
+V
S
-V
S
+V
S
-V
S
+V
S
-V
100 R4
Z
OS
XOS
then V
O
V
XVY
V
Z
----------------
R
0R4
R
1R2
------------- ±0.3% F.S.3
()
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