Zetex ZRA245N803, ZRA245R01, ZRA245R02, ZRA245R03, ZRA245Y01 Datasheet
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PRECISION 2.45 VOLT
VOLTAGE REFERENCE
ISSUE 3 — MARCH 1998
ZRA245
DEVICE DESCRIPTION
The ZRA245 uses a bandgap circuit design
to achieve a precision voltage reference of
2.45 volts. The device is available in small
outline surface mount packages, ideal for
applications where space saving is
important.
The ZRA245 design provides a stable voltage
without an external capacitor and is stable
with capacitive loads. The ZRA245 is
recommended for operation between 2mA
and 120mA.
SCHEMATIC DIAGRAM
VR
FEATURES
Small outline SOT23, SO8 and TO92
•
style package
No stabilising capacitor required
•
Typical TC 15ppm/°C
•
Typical slope resistance 0.26Ω
•
± 3% , 2% and 1% tolerance
•
Industrial temperature range
•
Operating current 2mA to 120mA
•
APPLICATIONS
Battery powered and portable
•
equipment.
Metering and measurement systems.
•
Instrumentation.
•
Test equipment.
•
Data acquisition systems.
•
Precision power supplies.
•
1.25V
REF
Gnd
4-227
ZRA245
ABSOLUTE MAXIMUM RATING
Reverse Current 200mA
Forward Current 25mA
Operating Temperature -40 to 85°C
Power Dissipation (T
SOT23 330mW
E-Line, 3 pin (TO92) 500mW
E-Line, 2 pin (TO92) 500mW
SO8 625mW
Storage Temperature -55 to 125°C
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) T
SYMBOL PARAMETER
V
I
I
R
MIN
R
Reverse Breakdown Voltage IR=5mA 2.43
Minimum Operating Current 2 mA
Recommended Operating
Current
T
† Average Reverse Breakdown
C
Voltage Temp. Co. I
R
§ Slope Resistance 0.26 0.5
S
Z
R
E
N
Reverse Dynamic Impedance IR =5mA
Wideband Noise Voltage IR= 5mA
CONDITIONS LIMITS TOL.
to
R(min)
I
R(max)
f = 100Hz
I
=0.1 I
AC
R
f = 10Hz to
10kHz
=25°C
amb
MIN TYP MAX
2.40
2.38
2 120 mA
=25°C)
amb
UNITS
%
2.45
2.47
1
V
2.45
2.50
2
2.45
2.52
3
15 50 ppm/°C
Ω
0.28 1
Ω
65
µV(rms)
(
V
−
V
†
T
Note: V
=
C
R(max)
R(max
V
- V
)
x (
R
R(min)
) x 1000000
R(min
)
T
−
T
(
max
)
)
(
min
)
is the maximum
deviation in reference voltage measured
over the full operating temperature
range.
V
Change
(
I
(
§
min) to I
R
R
=
S
R
I
(
max
) −
R
(
max
R
I
(
min
)
R
))
4-228
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