RC4200 데이터 시트보기 (PDF) - Fairchild Semiconductor
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RC4200 Datasheet PDF : 23 Pages
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PRODUCT SPECIFICATION
RC4200
Divider Circuit Offset Adjustment Procedure
1. Set each trimmer pot to 0V on the wiper.
2. Connect VX (input) to ground. Put a DC voltage of
approximatey 1/2 VZ (max.) DC on the VZ (input) with
an AC (squarewave is easiest) voltage of 1/2 VZ (max.)
peak-to-peak superimposed on it. Adjust XOS (R5) for
zero feedthrough. (No AC at V0)
Vz (Max.)
1/2 Vz (Max.)
1/2 Vz (Max.)
0V
3. Connect VX (input) to VZ (input) and put in the
1/2 VZ(max.) DC with an AC of approximately 20 mV
less than VZ(max.).
Adjust ZOS (R13) for zero feedthrough.
Vz (Max.)
1/2 Vz (Max.)
0V
~~ 10 mV
65-1868
4. Return VX (Input) to ground and connect VZ(max.)
DC on VZ(input). Adjust output VOS(R17) for VO =
0VO
5. Connect VX (input) to VZ (input) and and in VZ (max.)
DC. (The output will equal K.) Decrease the input
slowly until the output (V0 - K) deviates beyond the
desired accuracy. Adjust ZOS to bring it back into toler-
ance and return to Step 4. Continue steps 4 and 5 until
VZ reduces to the lowest value desired.
Notice that as the input to VX and VZ gets closer to zero (an
illegal state) the system noise will predominate so much that
an integrating voltmeter will be very helpful.
Square Root Circuit V0 = N√VX
+V REF
Ra
R1
VX
(Input)
Rb
Rc
8
5
I1
I4
7
RC4200
Multiplier
1
I2
2
3
4
6 I3
-VS
Rd
R4
RO
+VS
VO
(Output)
R ao
Figure 8.
-VS
65-1877
V-----X-----V----R-----E----F--
+
V-----R-----E----F--
2
+
V-----0----V----R-----E----F-
=
----V-----0---2-- + V-----0----V----R-----E----F- +
-V----0----V----R-----E----F-
+ V-----R-----E----F-- 2
R1Rb RaRb RaoRb R0R4 RcR4
R0Rd RcRd
If RaRb = RcRd and RaoRbR0Rd + RaoRbRcR4 = RcRdR0R4
Then ----V-----0--2---
R0R4
=
V-----X-----V----R-----E----F--
R1Rb
or
V0 2=
VXK
where
K
=
V-----R-----E----F---R-----0---R----4--
R1Rb
and V0 = N VX where N = K
0 ≤ VX ≤ VX(max.)and V0(max.) = N VX(max.)
N = ---V-----0---- (Design Requirements)
VX
R1
=
-V----0----(--m-----a--x---.--)---2-
74 µ A
2
N
Ra = Rd = -V5---0-R---µ--E--A--F-
Rb = Rc = 1-V---5--R-0---µE----AF---
R4 = -V----05----0(--m-µ----aA--x---.---)
Rao = V----1-0--2--(-5-m--µ---a-A-x---.--)-
R0 = V----2-0--2--(-5-m--µ---a-A-x---.---)
REV. 1.2.1 6/14/01
9
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