ZETEX ZR458A

PRECISION 2.45 VOLT
VOLTAGE REFERENCE
ZR458
ISSUE 2 — FEBRUARY 1998
DEVICE DESCRIPTION
FEATURES
The ZR458 uses a bandgap circuit design to
achieve a precision voltage reference of 2.45
volts.
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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 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
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SCHEMATIC DIAGRAM
VR
1.25VREF
Gnd
4-196
Battery powered and portable
equipment.
Metering and measurement systems.
Instrumentation.
Test equipment.
Data acquisition systems.
ZR458
ABSOLUTE MAXIMUM RATING
Reverse Current
Forward Current
Operating Temperature
Storage Temperature
Power Dissipation (Tamb=25°C)
E-Line, 2 pin (TO92)
500mW
200mA
25mA
-40 to 85°C
-55 to 125°C
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) Tamb=25°C
CONDITIONS
SYMBOL PARAMETER
VR
Reverse Breakdown Voltage
IMIN
Minimum Operating Current
IR
Recommended Operating
Current
TC †
Average Reverse
Breakdown Voltage
Temp. Co.
2.43
2.45 2.47
2
1
UNITS
V
2
mA
120
mA
ZR458A IR(min) to
IR(max)
15
50
ppm/°C
Reverse Dynamic Impedance
EN
Wideband Noise Voltage
0.26 0.5
Ω
IR = 5mA
f = 100Hz
IAC= 0.1 IR
0.28 1
Ω
IR = 5mA
f = 10Hz to
10kHz
65
(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 =
TYP MAX
100
ZR
§
MIN
30
Slope Resistance
TC =
TOL.
%
ZR458
RS §
†
IR=5mA
LIMITS
VR Change(IR (min) to IR (max))
IR (max) − IR (min)
4-197
µV(rms)
ZR458
TYPICAL CHARACTERISTICS
1.6
2.46
Reference voltage (V)
Forward Voltage (V)
1.4
1.2
1.0
0.8
0.6
0.4
1
10
100
2.45
2.44
2.43
-40
1000
-20
Forward Current (mA)
0
20
40
60
80
Temperature (°C)
Forward Characteristics
Temperature Drift
100
0.6
IR=2mA
Slope resistance (Ω)
Slope resistance (Ω)
TA=-40°C
0.4
TA=25°C
0.2
TA=85°C
10
IR=5mA
IR=20mA
1
0
0.1
1
10
0.01
100
0.1
Slope Resistance v Current
3.0
20mA
2.0
2mA
1
10
100
Frequency (KHz)
Reference Current (mA)
Slope Resistance v Frequency
4.0
3K6
2mA
1.0
Reverse Current (mA)
VR - (V)
TA=25°C
VIN
0.36K
20mA
VR
0
VIN - (V)
10
0
2.0
0
0
0
5
10
15
1.0
2.0
20
Reverse Voltage (V)
Time (µs)
Transient Response
Reverse Characteristics
4-198
3.0
ZR458
CONNECTION DIAGRAMS
E-Line, 2 pin, Package Suffix – Y
Bottom View
ORDERING INFORMATION
Part No
Tol%
TC Option
Package Partmark
ZR458
1
100ppm/ °C max
E-Line † ZR458
ZR458A
1
50ppm/ °C max
E-Line † ZR458A
† E-Line, 2 pin
4-199