Not Recommended for New Design
Please Use ZXRE125FF
PRECISION 1.25 VOLT
MICROPOWER VOLTAGE REFERENCE
ISSUE 3 - FEBRUARY 1998
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 capacitive loads. The ZR12D is
recommended for operation between 50µA
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.
ZR12D
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Small outline SOT23 package
No stabilising capacitor required
Typical T
C
30ppm/°C
Typical slope resistance 0.65Ω
±
3% tolerance
Industrial temperature range
Operating current 50µA to 5mA
Transient response, stable in less than
10µs
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.
SCHEMATIC DIAGRAM
V
R
G
nd
4-150
Not Recommended for New Design
Please Use ZXRE125FF
ZR12D
ABSOLUTE MAXIMUM RATING
Reverse Current
Forward Current
Operating Temperature
Storage Temperature
25mA
25mA
-40 to 85°C
-55 to 125°C
Power Dissipation (T
amb
=25°C)
SOT23
330mW
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) T
amb
=25°C
SYMBOL PARAMETER
CONDITIONS
MIN
V
R
I
MIN
I
R
T
C
†
R
S
§
Z
R
Reverse Breakdown
Voltage
Minimum Operating
Current
Recommended
Operating Current
Average Reverse Breakdown
Voltage Temp. Co.
I
R(min)
to
I
R(max)
Slope Resistance
Reverse Dynamic
Impedance
Wideband Noise Voltage
I
R
= 1mA
f = 100Hz
I
AC
= 0.1 I
R
I
R
= 150µA
f = 100Hz to
10kHz
0.05
30
I
R
=150µA
1.21
LIMITS
TYP MAX
1.25 1.29
30
50
5
90
3
V
µA
mA
ppm/°C
Ω
Ω
TOL.
%
UNITS
0.65 2
0.5
1
E
N
60
µV(rms)
†
Reverse Current (µA)
T
C
=
(
V
R
(
max
)
−
V
R
(
min
)
)
x
1000000
60
50
40
30
20
T
A
C
5°
C
=8
5°
=2
°C
T
A
40
=-
T
A
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.
§
V
R
Change
(
I
R
(
min
)
to I
R
(
max
))
R
S
=
I
R
(
max
) −
I
R
(
min
)
10
0
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Reverse Voltage (V)
Reverse Characteristics
4-151
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