SCHEMATIC DIAGRAM
PRECISION 1.25 VOLT
MICROPOWER VOLTAGE REFERENCE
ISSUE 3 - FEBRUARY 1998
ZR12D
V
R
G
nd
DEVICE DESCRIPTION
The ZR12D uses a bandgap circuit design to
achieve a precision micropower voltage
reference of 1.25 volts. The device is
available in a small outline SOT23 surface
mount package, ideal for applications where
space saving is important.
The ZR12D design provides a stable voltage
without an external capacitor and is stable
with cap acitive loa ds. The ZR12D 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 0.65
3% tolerance
Industrial temperature range
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.
Data acquisition systems.
Precision power supplies.
Test equipment.
4-150
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
Reverse Characteristics
Reverse Voltage (V)
Re
verse
Cu
rrent (
A)
0
0.2
0.4
0.8
1.4
0.6
1.0
0
10
20
30
40
50
60
T
A
=25C
T
A
=-
40C
T
A
=85C
1.2
ZR12D
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
1.21
1.25 1.29
3
V
I
MIN
Minimum Operating
Current
30
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
0.65 2
Z
R
Reverse Dynamic
Impedance
I
R
= 1mA
f = 100Hz
I
AC
= 0.1 I
R
0.5
1
E
N
Wideband Noise Voltage
I
R
= 150
A
f = 100Hz to
10kHz
60
V(rms)
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
)
4-151
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