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.
FEATURES
TO92 style package
No stabilising capacitor required
Typical T
C
15ppm/C
Typical slope resistance 0.26
1%
tolerance
Industrial temperature range (Military
temperature range available on request)
Operating current 2mA to 120mA
Alternative package options and
tolerances available
APPLICATIONS
Battery powered and portable
equipment.
Metering and measurement systems.
Instrumentation.
Test equipment.
Data acquisition systems.
PRECISION 2.45 VOLT
VOLTAGE REFERENCE
ISSUE 2 -- FEBRUARY 1998
ZR458
V
R
G
nd
1.25V
REF
SCHEMATIC DIAGRAM
4-196
ABSOLUTE MAXIMUM RATING
Reverse Current
200mA
Forward Current
25mA
Operating Temperature
-40 to 85C
Storage Temperature
-55 to 125C
Power Dissipation (T
amb
=25C)
E-Line, 2 pin (TO92)
500mW
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
=5mA
2.43
2.45 2.47
1
V
I
MIN
Minimum Operating Current
2
mA
I
R
Recommended Operating
Current
2
120
mA
T
C
Average
Reverse
ZR458
Breakdown Voltage
Temp.
Co.
ZR458A I
R(min)
to
I
R(max)
30
15
100
50
ppm/C
R
S
Slope Resistance
0.26 0.5
Z
R
Reverse Dynamic Impedance
I
R
= 5mA
f = 100Hz
I
AC
= 0.1 I
R
0.28 1
E
N
Wideband Noise Voltage
I
R
= 5mA
f = 10Hz to
10kHz
65
V(rms)
ZR458
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
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