Page 1
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.
SCHEMATIC DIAGRAM
R
CC
V
R
V
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=VCC-V
G
Figure 1:
This circuit will allow the reference to be
trimmed over a wide range. The device is
specified over a 65% trim range.
R
R
I
nd
RT=100k
(Optional trim facility)
nd
G
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ZRT040
ABSOLUTE MAXIMUM RATING
Reverse Current 75mA ø
Operating Temperature
Storage Temperature
A grade -55°C to 125°C
B grade -40°C to 85°C
C grade 0°C to 70°C
Power Dissipation (T
TO18 300mW
SO8 625mW
SOT223 2W
ø Above 25°C this figure should be linearly
derated to 15mA at 125°C
TO18 -55 °C to 175 °C
SO8, SOT223 -55 °C to 125 °C
TEMPERATURE DEPENDENT ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
DV
R
Output voltage
change over relevant
temperature range
(See note (a))
T
CVR
Output voltage
temperature coefficient
(See note (b))
INITIAL
VOLTAGE
TOL.%
1 & 2 11.0 36.0 7.5 24.0 4.2 14.0 mV
1 & 2 15.0 50.0 15.0 50.0 15.0 50.0 ppm/°C
GRADE A GRADE B GRADE C UNIT
TYP MAX TYP MAX TYP MAX
ELECTRICAL CHARACTERISTICS
( at T
SYMBOL PARAMETER
V
DV
T
I
R
t
on
t
off
e
R
=25°C and Trim pin o/c unless otherwise stated)
amb
MIN. TYP.
R
TRIM
Output voltage
1% tolerance (A1,C1,B1)
2% tolerance (C2,B2)
Output voltage adjustment
3.97
3.93
range
CDVTRIM
Change in TCVR with
output adjustment
Operating current range 0.15 75 mA
Turn-on time
Turn-off time
np-p
Output voltage noise (over
the range 0.1 to 10Hz)
S
Slope resistance 1.1 3.0
MAX. UNITS
4.01
4.05
V
4.01
4.09
65%
2.5 ppm/°C/%
40
µsR
0.3
50
µV
Ω
amb
=25°C)
COMMENTS
I
R
Peak to peak
measurement
IR=
0.5mA to 5mA
See note (c)
=500µA
R
=100kΩ
T
=1kΩ
L
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TYPICAL CHARACTERISTICS
ZRT040
NOTES
(a) Output change with temperature. (VR)
The absolute maximum difference between
the maximum output voltage and the
minimum output voltage over the specified
temperature range
D
(b) Output temperature coefficient (TCVR)
The ratio of the output change with
temperature to the specified temperature
range expressed in ppm/°C
TcV
R
∆T= Full temperature range
=
VR = V
V
x
10
∆
R
V
x ∆
R
- V
max
min
6
ppm
⁄
°
C
T
(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 :
change
in
V
R
=
S
specifiedcurrentrange
∆
I = 5 - 0.5 = 4.5mA (typically)
R
(e) Line regulation
The ratio of change in output voltage to the
change in input voltage producing it.
R
x 100
S
V
x
R
R
source
% ⁄
V
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ZRT040
CONNECTION DIAGRAMS
SOT223 Package Suffix – G
TO18 Package Suffix – None
Top View
Pin 4 floating or connected to pin 2
SO8 Package Suffix – N8
Top View
ORDERING INFORMATION
Part No Tol% Gra-dePackage 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
Bottom View –
Case is internally connected to pin 3
Part No Tol% Gra-dePackage 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 -55°C to 125°C
B Grade -40°C to 85°C
C Grade 0°C to 70°C
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