PRECISION 2.45 VOLT
VOLTAGE REFERENCE
ISSUE 2 — FEBRUARY 1998
ZR458
FEATURES
DEVICE DESCRIPTION
The ZR458 uses a bandgap circuit design to
achieve a precision voltage reference of 2.45
volts.
The ZR458 design provides a stable voltage
without an external capacitor and is stable
wi th capaci tive loads. The ZR458 is
recommended for operation between 2mA
and 120mA.
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TO92 style package
No stabilising capacitor required
Typical T
C
15ppm/°C
Typical slope resistance 0.26Ω
1%
tolerance
Industrial temperature range (Military
temperature range available on request)
Operating current 2mA to 120mA
Alternative package options and
tolerances available
Battery powered and portable
equipment.
Metering and measurement systems.
Instrumentation.
Test equipment.
Data acquisition systems.
APPLICATIONS
SCHEMATIC DIAGRAM
V
R
1.25V
REF
G
nd
4-196
ZR458
ABSOLUTE MAXIMUM RATING
Reverse Current
Forward Current
Operating Temperature
Storage Temperature
200mA
25mA
-40 to 85°C
-55 to 125°C
Power Dissipation (T
amb
=25°C)
E-Line, 2 pin (TO92)
500mW
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) T
amb
=25°C
SYMBOL PARAMETER
CONDITIONS
MIN
V
R
I
MIN
I
R
T
C
†
Reverse Breakdown Voltage
Minimum Operating Current
Recommended Operating
Current
Average Reverse
Breakdown Voltage
Temp. Co.
Slope Resistance
ZR458
ZR458A I
R(min)
to
I
R(max)
2
I
R
=5mA
2.43
LIMITS
TYP MAX
2.45 2.47
2
120
1
V
mA
mA
TOL.
%
UNITS
30
15
100
ppm/°C
50
Ω
Ω
R
S
§
Z
R
0.26 0.5
Reverse Dynamic Impedance
I
R
= 5mA
f = 100Hz
I
AC
= 0.1 I
R
I
R
= 5mA
f = 10Hz to
10kHz
0.28 1
E
N
Wideband Noise Voltage
65
µV(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
)
4-197
Microcontroller MCU
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