PRECISION 2.45 VOLT
VOLTAGE REFERENCE
ZR404
ISSUE 2 — FEBRUARY 1998
DEVICE DESCRIPTION
FEATURES
The ZR404 uses a bandgap circuit design to
achieve a precision voltage reference of 2.45
volts. The device is available in small outline
s ur f a ce mo u n t p a c k a g e s , i d e a l for
a p pl i c a t i on s whe re s pac e s av i ng i s
important as well as a 2 pin TO92 style
package for through hole requirements.
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The ZR404 design provides a stable voltage
without an external capacitor and is stable
wi th capaci tive loads. The ZR404 is
recommended for operation between 2mA
and 120mA.
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Small outline SO8 and TO92
style packages
No stabilising capacitor required
Typical TC 15ppm/°C
Typical slope resistance 0.26Ω
± 3% tolerance
Industrial temperature range (Military
temperature range available on request)
Operating current 2mA to 120mA
Alternative package options and
tolerances are available
APPLICATIONS
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SCHEMATIC DIAGRAM
VR
1.25VREF
Gnd
4-169
Battery powered and portable
equipment.
Metering and measurement systems.
Instrumentation.
Test equipment.
Data acquisition systems.
Precision power supplies.
ZR404
ABSOLUTE MAXIMUM RATING
Reverse Current
Forward Current
Operating Temperature
Storage Temperature
Power Dissipation (Tamb=25°C)
E-Line, 2 pin (TO92)
500mW
SO8
625mW
200mA
25mA
-40 to 85°C
-55 to 125°C
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) Tamb=25°C
SYMBOL PARAMETER
VR
Reverse Breakdown Voltage
IMIN
Minimum Operating Current
IR
Recommended Operating
Current
TC †
Average Reverse Breakdown
Voltage Temp. Co.
RS §
Slope Resistance
ZR
Reverse Dynamic Impedance
EN
Wideband Noise Voltage
†
TC =
CONDITIONS
IR=5mA
RS =
MIN
TYP MAX
2.38
2.45 2.52
2
15
IR(min) to
IR(max)
TOL.
%
3
UNITS
V
2
mA
120
mA
50
ppm/°C
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.
§
LIMITS
VR Change(IR (min) to IR (max))
IR (max) − IR (min)
4-170
µV(rms)
ZR404
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
100
0.01
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
4-171
3.0
ZR404
CONNECTION DIAGRAMS
E-Line, 2 pin
Package Suffix – V
Bottom View
SO8 Package Suffix – D
Top View
ORDERING INFORMATION
Part No
Tol% Package
Partmark
ZR404
3
E-Line †
ZR404
ZR404D
3
SO8
ZR404
† E-Line 2 pin
4-172