2.5V LOW POWER
PRECISION REFERENCE SOURCE
ISSUE 1 - OCTOBER 1995
ZRT025
DEVICE DESCRIPTION
The ZRT025 is a monolithic integrated circuit
providing a precise stable reference voltage
of 2.5V at 500µA.
The circuit features a knee current of 150µA
and operation over a wide range of
temperatures and currents.
The ZRT025 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 two temperature ranges
•
1 and 2% initial voltage tolerance
•
versions available
No external stabilising capacitor
•
required in most cases
Low slope resistance
•
No derating required at low
•
temperatures
TO18 package
•
SOT223 and SO8 small outline
•
packages
R=VCC-V
G
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
4-279
ZRT025
ABSOLUTE MAXIMUM RATING
Reverse Current 75mA ø
Operating Temperature
A grade -55°C to 125°C
C grade 0°C to 70°C
Storage Temperature
TO18 -55 °C to 175 °C
Power Dissipation (T
TO18 300mW
SO8 625mW
SOT223 2W
ø Above 72°C this figure should be linearly
derated to 25mA at 125°C
SO8, SOT223 -55 °C to 125 °C
TEMPERATURE DEPENDENT ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
DV
Output voltage change
R
over relevant
temperature range
(See note (a))
T
CVR
Output voltage
temperature coefficient
(See note (b))
INITIAL
VOLTAGE
TOLERANCE
%
1 & 2 6.8 22.5 2.7 8.8 mV
1 & 2 15.0 50.0 15.0 50.0 ppm/°C
GRADE A
-55°C TO 125°C
GRADE C
0°C TO 70°C
TYP MAX TYP MAX
ELECTRICAL CHARACTERISTICS
( at T
SYMBOL PARAMETER
V
DV
T
I
R
t
on
t
off
e
np-p
R
=25°C and Trim pin o/c unless otherwise stated)
amb
MIN. TYP.
R
TRIM
Output voltage
1% tolerance (A1,C1)
2% tolerance (C2)
Output voltage adjustment
2.475
2.450
range
CDVTRIM
Change in TCVR with output
adjustment
Operating current range 0.15 75 mA
Turn-on time
Turn-off time
Output voltage noise (over the
range 0.1 to 10Hz)
S
Slope resistance 0.85 2.0
MAX. UNITS
2.500
2.525
V
2.500
2.550
65%
2.5 ppm/°C/%
10
µsR
0.3
50
µV
Ω
amb
=25°C)
UNITS
COMMENTS
=500µA
I
R
=100kΩ
R
T
=1kΩ
L
Peak to peak
measurement
IR= 0.5mA to
5mA
See note (c)
4-280
TYPICAL CHARACTERISTICS
ZRT025
NOTES
(a) Output change with temperature
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) Slope resistance (R
)
S
The slope resistance is defined as :
change
in
V
R
=
S
specifiedcurrentrange
∆
I = 5 - 0.5 = 4.5mA (typically)
R
(d) 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
4-281
ZRT025
CONNECTION DIAGRAMS
SOT223 Package Suffix – G
Top View
Pin 4 floating or connected to pin 2
TO18 Package Suffix – None
Bottom View –
Case is internally connected to pin 3
SO8 Package Suffix – N8
Top View
ORDERING INFORMATION
Part No Tol% Operating
Temp.(°C)
ZRT025C2 2 0 to 70 TO18 ZRT025C2
ZRT025C1 1 0 to 70 TO18 ZRT025C1
ZRT025A1 1 -55 to 125 TO18 ZRT025A1
ZRT025GC2 2 0 to 70 SOT223 ZRT025C2
ZRT025GC1 1 0 to 70 SOT223 ZRT025C1
ZRT025GA1 1 -55 to 125 SOT223 ZRT025A1
ZRT025N8C2 2 0 to 70 SO8 ZRT025C2
ZRT025N8C1 1 0 to 70 SO8 ZRT025C1
ZRT025N8A1 1 -55 to 125 SO8 ZRT025A1
Package Partmark
4-282
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