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PRECISION 2.45 VOLT
VOLTAGE REFERENCE
ISSUE 2 — FEBRUARY 1998
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
with capacitive loads. The ZR458 is
recommended for operation between 2mA
and 120mA.
ZR458
FEATURES
• TO92 style package
• No stabilising capacitor required
• Typical TC 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
APPLICATIONS
• Battery powered and portable
equipment.
• Metering and measurement systems.
• Instrumentation.
• Test equipment.
• Data acquisition systems.
SCHEMATIC DIAGRAM
VR
1.25VREF
Gnd
4-196
ZR458
ABSOLUTE MAXIMUM RATING
Reverse Current
200mA
Forward Current
25mA
Operating Temperature -40 to 85°C
Storage Temperature
-55 to 125°C
Power Dissipation (Tamb=25°C)
E-Line, 2 pin (TO92)
500mW
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) Tamb=25°C
SYMBOL PARAMETER
CONDITIONS
LIMITS
MIN TYP MAX
TOL. UNITS
%
VR Reverse Breakdown Voltage IR=5mA
IMIN Minimum Operating Current
2.43 2.45 2.47
2
1V
mA
IR Recommended Operating
Current
2 120 mA
TC †
RS §
Average Reverse
Breakdown Voltage
Temp. Co.
Slope Resistance
ZR458
ZR458A IR(min) to
IR(max)
30 100
15 50
0.26 0.5
ppm/°C
Ω
ZR Reverse Dynamic Impedance IR = 5mA
f = 100Hz
IAC= 0.1 IR
EN Wideband Noise Voltage
IR= 5mA
f = 10Hz to
10kHz
0.28 1
65
Ω
µV(rms)
†
TC
=
(VR(max)−VR(min)) x 1000000
VR x (T(max)−T(min))
Note: VR(max) - VR(min) is the maximum
deviation in reference voltage measured
over the full operating temperature
range.
§
RS
=
VR
Change(IR (min) to IR
IR (max) − IR (min)
(max))
4-197
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