RC4200
PRODUCT SPECIFICATION
Square Root Circuit Offset Adjust
+VREF
R
R
5
R
R
d
c
b
a
R4
R1
8
VX
(Input)
I
I
4
1
+VS
RC4200
Multiplier
R8
R6
7
XOS
R5
R7
1
2
+VS
YOS
-VS
µ
µ
0.1
F
F
I
RO
R17 = R
2
b
4
I
VO
(Output)
R14
R15
+VS
3
3
6
R16
R9
0.1
-VS
-VS
µ
F
0.1
R
-VS
ao
+VS
R10
R11
R12
R14-R17 can be used in place of R9 to help
reduce linearity error due to resistor product
mis-match (See Appendix 1).
R13 VOS
-VS
65-1876
Figure 9. Square Root Circuit Offset Adjust
10K ≤ R5 = R13 ≤ 50K
Procedure
1. Set both trimmer pots to 0V on the wiper.
R7 = 100Ω
2. Put in a full scale (0 to V (max.) squarewave on V
X
X
VS
input. Adjust X (R5) for proper peak-to-peak ampli-
OS
tude on V output. (Scaling adjust)
0
---------
R6 = R7
0.05
||
||
3. Connect V input to ground. Adjust V (R13) for 0V
R8 = R1 Ra Rao
X
OS
on V output.
0
R9 = Rb
||
R10 = R0 RC
R11 = 100Ω
VS
11 0.1
------
R12 = R
10
REV. 1.2.1 6/14/01
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
