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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： | 6/25页 |
| 文件大小： | 265K |
| 代理商： | RC4200MT |
RC4200
PRODUCT SPECIFICATION
14
REV. 1.2.1 6/14/01
Reducing Mismatch Errors
You need not use 0.01% resistors to reduce resistor product
mismatch errors. Here are a couple of ways to obtain
maximum accuracy out of the extended range multiplier
(see Figure 4) using 1% resistors.
Method 1
VX feedthrough, for example, occurs when VY = 0 and
VOSY
≠ 0. This VX feedthrough will equal ±VXVOSY.
Also, if VOSZ
≠ 0, there is a VX feedthrough equal to
VXVOSZ. A resistor-product error of
α will cause a VX
feedthrough of ±
αVX. Likewise, VY feedthrough errors are:
±VYVOSX, ±VYVOSZ and ±
βVY
Total feedthrough:
±VXVOSY ±VYVOSX ±
αVX ±βVY ±(VX + VY) VOSZ
By carefully abusing XOS(R5), YOS(R9) and ZOS(R20) this
equation can be made to very nearly equal zero and the
feedthrough error will practically disappear.
A residual of set will probably remain which can be trimmed
outwith VOS(R16) at the output of amp.
Method 2
Notice that the ratios of R1Rb:RCXRd and R2Ra:RCYRd are
both dependent of Rd also that R1, R2, Ra and Rb are all
functions of the maximum input requirements. By designing
a multiplier for the same input ranges on both VX and VY
then R1 = R2, RCX = RCY and Ra = Rb. (Note: it is accept-
able to design a four quadrant multiplier and use only two
quadrants of it.)
Select Rd to be 1% or 2% below (or above) the calculated
value. This will cause
α and β to both be positive (or nega-
tive) by nearly the same amount. Now the effective value of
Rd can be trimmed with an offset adjustment ZOS(R20) on
pin 5.
This technique causes: a slight gain error which can be com-
pensated with the R0 value, and an output of offset error that
can be trimmed with VOS(R16) on the output op amp.
Extended Range Divider
The only cross-product error of interest is the VZ
feedthrough (VX = 0 and VOSX
≠ 0) which is easily adjusted
with XOS(R5). See Figure 6.
Resistor product mismatch will cause scaling errors (gain)
that could be a problem for very low values of VZ. Adjust-
ments to YOS(R18) can be made to improve the high gain
accuracy.
Square Root and Squaring
These circuits are functions of single variables so
feedthrough, as such, is not a consideration. Cross product
errors will effect incremental accuracy that can be corrected
YOS(R14) or ZOS(R10). See Figure 9 and Figure 11.
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| RC4200MT_32 | 功能描述:增效器/分频器 RoHS:否 制造商:Texas Instruments 产品:Multiplier 逻辑系列: 工作电源电压: 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:Through Hole 封装 / 箱体:PDIP-14 |
| RC4200N | 功能描述:增效器/分频器 DIP-8 RoHS:否 制造商:Texas Instruments 产品:Multiplier 逻辑系列: 工作电源电压: 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:Through Hole 封装 / 箱体:PDIP-14 |
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