RC4200M Fairchild Semiconductor, RC4200M Datasheet - Page 5

• Manufacturer Part Number: RC4200M
• Manufacturer: Fairchild Semiconductor

Specifications of RC4200M

• Number Of Elements: 1
• Output Type: Single
• Power Supply Requirement: Single
• Single Supply Voltage (typ): -15V
• Single Supply Voltage (min): -9V
• Single Supply Voltage (max): -18V
• Dual Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: SOIC N
• Lead Free Status / RoHS Status: Compliant

PRODUCT SPECIFICATION
Voltage Multiplier/Divider
Extended Range
The input and output voltage ranges can be extended to
include 0 and negative voltage signals by adding bias
currents. The R
input and biasing resistors are selected to limit the respective
currents to 50 µA min. and 250 µA max.
Extended Range Multiplier
REV. 1.2.1 6/14/01
Solving for V
For a multiplier circuit V
Therefore: V
For a divider circuit V
Therefore: V
V
(Input)
V
(Input)
X
Y
V
V
V
R
X
Y
X
1
V
R
Y
2
Figure 4. Extended Range Multiplier
R
=
Figure 3. Voltage Multiplier/Divider
R
1
R
0
0
A
V
0
R
R
O
O
S
=
=
R
2
1
V
R
R
=
C
2
C4
Z
4
S
V
V
------- - K where K
V
V
------------------------------------- -
V
I
filter circuits are eliminated when the
X
X
Z
2
I
X
Z
1
V
R
8
1
7
2
V
I
Y
I
2
B
1
Y
8
1
7
2
–V
Y
R
K where K
=
Z
CX
RC4200
3
S
RC4200
=
V
3
R
R
R
V
1
0
R
R
R
=
–V
2
6
4
S
6
=
cons
=
5
R
4
5
4
=
I
cons
V
-------------------- -
I
I
3
C
I
3
4
4
R
R
-------------------- -
V
tan
R
1
R
R
R
tan
0
R
0
R
t
R
R
2
4
R
1
O
4
R
t
R
65-4200-04
4
+V
R
O
2
D
65-4200-05
S
–V
V
+V
O
(Output)
S
REF
V
V
Z
O
Resistors R
inputs by picking values such that:
Resistor R
output to go negative.
Resistors R
Cross-Product Cancellation
Cross-products are a result of ths
To the extend that R
cross-product cancellation will occur.
Arithmetic Offset Cancellation
The offset caused by the V
extent that R
Resistor Values
Inputs:
and I
also I
and I
V
----------------- -
V
----------------------- -
V
--------------- -
where K =
V
V
V
K
R
R
I
Y
0
R
V
--------
V
V
1
1
R
Y
REF
V
1
X
Y
V
R
0
X
1
V
R
=
REF
R
X
Y
min.
2
X
+
d
min.
min.
1
2
2
X
2
+
=
=
V
--------------- -
--------------- - Design Requirements
V
(max.)
(max.)
(min.)
=
V
-------------------------
REF
R
+
X
=
V
V
V
X
a
R
V
-------------------------
Constant (+7V to +18V)
V
V
1
X
Y
0
C
R
X
=
V
-------------------- - or V
R
a
CX
REF
cx
--------------------------- -
V
(max.) –
(max.) =
Y
V
supplies bias current for I
b
a
R
V
--------
and R
0
R
V
V
REF
R
REF
V
----------------------- -
R
V
Y
=
=
=
2
0
R
d
and R
X
Y
b =
X
+
R
+
REF
0
V
-------------------------
R
V
----------------------- -
V
---------------------- -
V
----------------------- -
+
V
--------------- -
d
R
R
min.
Y
R
REF
R
V
-------------------------
b
1
X
Y
Y
R
d
V
V
R
1
V
2
b
Y
1
R
extend the range of the V
(max.)
(min.)
R
(max.)
CY
R
R
R
CY
REF
0
X
V
Y
R
V
V
a
R
2
2
1
2
(max.)
(max.)
REF
b
X
Y
R
d
=
+
permit equation (6) to balance, ie.:
d
= R
(min.)
+
, and the result is:
(min.)
0
V
------------- -
V
--------------- - =
V
------ -
R
REF
R
+
+
REF
a
=
R
+
+
0
0
V
----------------
REF
CX
R
R
+
V
------------- -
REF
a
c
V
------------- -
V
------------- -
b
V
R
V
--------------- -
2
R
R
R
REF
R
REF
REF
d
REF
R
term will cancel to the
X
b
2
D
b
C
a
V
=
V
, and R
X
Y
+
50 µA,
V
=
=
=
------------ -
R
K
3
V
R
CX
50 µA,
X
250 µA,
250 µA.
which allows the
and V
+
2
R
------------ -
R
V
CY
a
Y
X
Y
= R
V
and V
V
--------------- -
R
R
CY
REF
D
terms.
R
RC4200
Y
d
5