4.0V LOW POWER
PRECISION REFERENCE SOURCE
ISSUE 2 - OCTOBER 1997
DEVICE DESCRIPTION
The ZRT040 is a monolithic integrated circuit
providing a precise stable reference voltage
of 4.01V at 500碌A.
The circuit features a knee current of 150碌A
and operation over a wide range of
temperatures and currents.
The ZRT040 is available in a 3-pin metal can
package for through hole applications as
well as SOT223 and SO8 packages for
surface mount applications. Each package
option offers a trim facility whereby the
output voltage can be adjusted as shown in
F i g . 1. Thi s f a ci l i t y i s u sed w he n
compensating for system errors or setting
the reference output to a particular value.
When the trim facility is not used, the pin
should be left open circuit.
ZRT040
FEATURES
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鈥?/div>
鈥?/div>
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Trimmable output
Excellent temperature stability
Low output noise figure
Available in three temperature ranges
1 and 2% initial voltage tolerance
versions available
No external stabilising capacitor
required in most cases
Low slope resistance
TO18 package
SOT223 and SO8 small outline
packages
SCHEMATIC DIAGRAM
R
V
CC
V
R
R=V
CC
-V
R
I
R
R
T
=100k
(Optional trim facility)
G
nd
G
nd
Figure 1:
This circuit will allow the reference to be
trimmed over a wide range. The device is
specified over a 5% trim range.
4-283
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