4.0V LOW POWER
PRECISION REFERENCE SOURCE
ISSUE 2 - OCTOBER 1997
ZRT040
DEVICE DESCRIPTION
The ZRT040 is a monolithic integrated circuit
providing a precise stable reference voltage
of 4.01V at 500µA.
The circuit features a knee current of 150µA
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
Fig.1. This facility is used when
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.
FEATURES
• 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
VCC
VR
R=VCC-VR
IR
RT=100k
(Optional trim facility)
Gnd
Gnd
Figure 1:
This circuit will allow the reference to be
trimmed over a wide range. The device is
specified over a Ϯ5% trim range.
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