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 500
A.
The circuit features a knee current of 150
A
and ope ra tion 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 . T h i s f a c i l i t y i s u s e d w h e 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.
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
R
V
CC
V
R
G
nd
G
nd
R
T
=100k
(Optional trim facility)
R=V
CC
-V
R
I
R
Figure 1:
This circuit will allow the reference to be
trimmed over a wide range. The device is
specified over a 5% trim range
.
SCHEMATIC DIAGRAM
4-283
ABSOLUTE MAXIMUM RATING
Reverse Current
75mA
Operating Temperature
A grade
-55C to 125C
B grade
-40C to 85C
C grade
0C to 70C
Storage Temperature
TO18
-55 C to 175 C
SO8, SOT223 -55 C to 125 C
Power Dissipation (T
amb
=25C)
TO18
300mW
SO8
625mW
SOT223
2W
Above 25C this figure should be linearly
derated to 15mA at 125C
ELECTRICAL CHARACTERISTICS
( at T
amb
=25C and Trim pin o/c unless otherwise stated)
SYMBOL
PARAMETER
MIN.
TYP. MAX. UNITS
COMMENTS
V
R
Output voltage
1% tolerance (A1,C1,B1)
2% tolerance (C2,B2)
3.97
3.93
4.01
4.01
4.05
4.09
V
I
R
=500
A
V
TRIM
Output voltage adjustment
range
5
%
R
T
=100k
T
C
V
TRIM
Change in T
C
V
R
with
output adjustment
2.5
ppm/C/%
I
R
Operating current range
0.15
75
mA
t
on
t
off
Turn-on time
Turn-off time
40
0.3
s
R
L
=1k
e
np-p
Output voltage noise (over
the range 0.1 to 10Hz)
50
V
Peak to peak
measurement
R
S
Slope resistance
1.1
3.0
I
R
=
0.5mA to 5mA
See note (c)
ZRT040
TEMPERATURE DEPENDENT ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
INITIAL
VOLTAGE
TOL.%
GRADE A
GRADE B
GRADE C
UNIT
TYP
MAX TYP
MAX TYP
MAX
V
R
Output voltage
change over relevant
temperature range
(See note (a))
1 & 2
11.0
36.0
7.5
24.0
4.2
14.0
mV
T
C
V
R
Output voltage
temperature coefficient
(See note (b))
1 & 2
15.0
50.0
15.0
50.0
15.0
50.0
ppm/C
4-284
TYPICAL CHARACTERISTICS
ZRT040
NOTES
(a) Output change with temperature. (V
R
)
The absolute maximum difference between
the maximum output voltage and the
minimum output voltage over the specified
temperature range
V
R
= V
max
- V
min
(b) Output temperature coefficient (T
C
V
R
)
The ratio of the output change with
temperature to the specified temperature
range expressed in ppm/C
T
c
V
R
=
V
R
x
10
6
V
R
x
T
ppm
/
C
T= Full temperature range
(c) Operating current (I
R
)
Maximum operating current must be
derated as indicated in maximum ratings.
(d) Slope
resistance
(R
S
)
The slope resistance is defined as :
R
S
=
change
in
V
R
specifiedcurrentrange
I = 5 - 0.5 = 4.5mA (typically)
(e) Line
regulation
The ratio of change in output voltage to the
change in input voltage producing it.
R
S
x 100
V
R
x
R
source
%
/
V
4-285
SO8 Package Suffix N8
Top
View
TO18 Package Suffix None
Bottom View
Case
is
internally
connected
to
pin
3
SOT223
Package
Suffix G
Top
View
Pin 4 floating or connected to pin 2
CONNECTION DIAGRAMS
ORDERING INFORMATION
ZRT040
Part No
Tol% Gra-
de
Package Partmark
ZRT040C2
2
C
TO18
ZRT040C2
ZRT040C1
1
C
TO18
ZRT040C1
ZRT040B2
2
B
TO18
ZRT040B2
ZRT040B1
1
B
TO18
ZRT040B1
ZRT040A1
1
A
TO18
ZRT040A1
ZRT040GC2
2
C
SOT223 ZRT040C2
ZRT040GC1
1
C
SOT223 ZRT040C1
ZRT040GB2
2
B
SOT223 ZRT040B2
ZRT040GB1
1
B
SOT223 ZRT040B1
ZRT040GA1
1
A
SOT223 ZRT040A1
Part No
Tol% Gra-
de
Package Partmark
ZRT040N8C2 2
C
SO8
ZRT040C2
ZRT040N8C1 1
C
SO8
ZRT040C1
ZRT040N8B2 2
B
SO8
ZRT040B2
ZRT040N8B1 1
B
SO8
ZRT040B1
ZRT040N8A1 1
A
SO8
ZRT040A1
A Grade -55C
to
125C
B Grade -40C
to
85C
C Grade
0C
to
70C
4-286
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