RC4200 Просмотр технического описания (PDF) - Fairchild Semiconductor
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RC4200 Datasheet PDF : 23 Pages
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PRODUCT SPECIFICATION
RC4200
Extended Range Divider
Ra
R1
VX
(Input)
+VREF
+VREF
Rb
R az Rc
Rd
8
5
I1
I4
7
RC4200
Multiplier
1
I2
2
3
4
6 I3
-VS
R4
VZ
(Output)
VO
RO
(Output)
+VS
RC5534
Rao
-VS
65-4200-08
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.
V-----X---
R1
+
--V----0---
Rao
+
-V-----Z---
Raz
+
V-----RR-----Ea----F-
V-----RR----b-E----F-
=
-V----0-
R0
+
-V----RR----C-E----F-
V-----Z--
R4
+
V----R-R----D-E----F-
V-----X-----V----R-----E----F-- + V-----0----V----R-----E----F- + V-----Z----V-----R----E----F-- + V-----R-----E----F--2 =
R1Rb
RaoRb RazRb RaRb
V-----0----V----Z-- + V-----0----V----R-----E----F- + V-----Z----V-----R----E----F-- + V-----R-----E----F--2
R0R4 R0Rd
R4Rc RcRd
To cancel cross-product and arithmetic offset:
RaoRb = R0Rd, RazRb = R4Rc and RaRb = RcRd
and the result is:
V-----X----V----R----E---F- = V-----0---V----Z--
R1Rb
R0R4
or
V0
= ---V----X----
VZK
where K = V-----R----E---F---R----0---R----4-
R1Rb
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-----0---V----Z--(Design Requirement)
VX
R0 = 7----5∆---0-V--µ--0--A-- , Rb = -∆2---5-V--0--R-µ---E-A--F- , R4 = 2---∆-0---0-V--µ--Z--A--
Rc = 7----5---0---µ----A----∆----V-----0∆----–V----7-0--0V---0--R--µ--E--A-F-----V-----0--(---m----a---x---.--)-
Rd = -2---5---0---µ----A----∆----V-----Z∆----V–-----X2---0V---0--R-µ---E-A--F-----V----Z---(---m-----a--x---.--)-
Ra
=
R-----c--R----d- ,
Rb
Raz
=
R-----c--R----4- ,
Rb
Rao
=
R-----0--R-----d-
Rb
R1 = -∆6---0-V--0--0-µ--∆--A--V---K-Z--
REV. 1.2.1 6/14/01
7
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