V
R
G
nd
DEVICE DESCRIPTION
The ZR25D uses a bandgap circuit design to
achieve a precision micropower voltage
reference of 2.5 volts. The device is available
in a small outline SOT23 surface mount
package, ideal for applications where space
saving is important.
The ZR25D design provides a stable voltage
without an external capacitor and is stable
with cap acitive loa ds. The ZR25D 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 SOT23 package.
No stabilising capacitor required
Typical T
C
30ppm/C
Typical slope resistance 0.4
3%, 2% and 1% tolerance
Industrial temperature range
Operating current 50
A to 5mA
Transient response, stable in less than
10
s
Alternative package options 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
ZR25D
SCHEMATIC DIAGRAM
4-161
ABSOLUTE MAXIMUM RATING
Reverse Current
25mA
Forward Current
25mA
Operating Temperature
-40 to 85C
Storage Temperature
-55 to 125C
Power Dissipation (T
amb
=25C)
SOT23
330mW
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
2.425
2.5
2.5
2.5
2.525
2.55
2.575
1
2
3
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 = 100Hz to
10kHz
45
V(rms)
ZR25D
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
)
4-162
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