V
R
G
nd
DEVICE DESCRIPTION
The ZREF25 uses a bandgap circuit design to
achieve a precision micropower voltage
reference of 2.5 volts. The device is available
in a small outline surface mount package,
ideal for applications where space saving is
important as well as packages for through
hole requirements.
The ZREF25 design provides a stable voltage
without an external capacitor and is stable
with capacitive loads. The ZREF25 is
recommended for operation between 50
A
and 5mA and so is ideally suited to low
power and battery powered applications.
Excellent performance is maintained to an
absolute maximum of 25mA, however the
rugged design and 20 volt processing allows
the reference to withstand transient effects
and currents up to 200mA. Superior
switching capability allows the device to
reach stable operating conditions in only a
few microseconds.
FEATURES
Small outline SO8 and TO92 style
packages.
No stabilising capacitor required
Typical T
C
30ppm/C
Typical slope resistance 0.4
2%
and 1% tolerance
Industrial temperature range (Military
temperature range available on request)
Operating current 50
A to 5mA
Transient response, stable in less than 10
s
Alternative package options and
tolerances are available
APPLICATIONS
Battery powered and portable equipment.
Metering and measurement systems.
Instrumentation.
Test equipment.
Data acquisition systems.
Precision power supplies.
PRECISION 2.5 VOLT MICROPOWER
VOLTAGE REFERENCE
ISSUE 2 - FEBRUARY 1998
ZREF25
SCHEMATIC DIAGRAM
4-271
ABSOLUTE MAXIMUM RATING
Reverse Current
25mA
Forward Current
25mA
Operating Temperature
-40 to 85C
Storage Temperature
-55 to 125C
Power Dissipation (T
amb
=25C)
E-Line, 3 pin (TO92)
500mW
E-Line, 2 pin (TO92)
500mW
SO8
625mW
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) T
amb
=25C
SYMBOL PARAMETER
CONDITIONS
LIMITS
TOL.
%
UNITS
MIN
TYP MAX
V
R
Reverse Breakdown Voltage
I
R
=150
A
2.475
2.45
2.5
2.5
2.525
2.55
1
2
V
I
MIN
Minimum Operating Current
25
50
A
I
R
Recommended Operating
Current
0.05
5
mA
T
C
Average Reverse Breakdown
Voltage Temp. Co.
I
R(min)
to
I
R(max)
30
90
ppm/C
R
S
Slope Resistance
0.4
2
Z
R
Reverse Dynamic Impedance
I
R
= 1mA
f = 100Hz
I
AC
= 0.1 I
R
0.3
0.8
E
N
Wideband Noise Voltage
I
R
= 150
A
f = 10Hz to
10kHz
45
V(rms)
ZREF25
0
Reverse Characteristics
Reverse Voltage (V)
R
evers
e C
ur
ren
t
(
A
)
0.2
0.6
10
20
30
40
50
60
1.0
1.8
2.6
1.4
2.2
T
A
=25
C
T
A
=85
C
T
A
=-
40C
T
C
=
(
V
R
(
max
)
-
V
R
(
min
)
)
x 1000000
V
R
x
(
T
(
max
)
-
T
(
min
)
)
Note: V
R(max)
- V
R(min)
is the maximum
deviation in reference voltage measured
over the full operating temperature
range.
R
S
=
V
R
Change
(
I
R
(
min
)
to I
R
(
max
)
)
I
R
(
max
)
-
I
R
(
min
)
4-272
SO8 Package Suffix N8
Top
View
E-Line, 3 pin,Rev Package Suffix R
Bottom View
Pin 3 floating or connected to pin 1
E-Line, 2 pin Package Suffix Y
Bottom
View
CONNECTION DIAGRAMS
Part No
Tol% Package
Partmark
ZREF25D02
2
SO8
ZREF2502
ZREF25D
1
SO8
ZREF25
ZREF25Z02
2
E-Line *
ZREF2502
ZREF25Z
1
E-Line *
ZREF25
ZREF2502
2
E-Line
ZREF2502
ZREF25
1
E-Line
ZREF25
* E-Line 3 pin Reversed
E-Line 2 pin
ORDERING INFORMATION
ZREF25
4-274
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