PRECISION 2.45 VOLT
VOLTAGE REFERENCE
ISSUE 2 — FEBRUARY 1998
ZR404
FEATURES
DEVICE DESCRIPTION
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.
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 T
C
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
Battery powered and portable
equipment.
Metering and measurement systems.
Instrumentation.
Test equipment.
Data acquisition systems.
Precision power supplies.
SCHEMATIC DIAGRAM
V
R
1.25V
REF
G
nd
4-169
ZR404
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
SO8
625mW
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) T
amb
=25°C
SYMBOL PARAMETER
CONDITIONS
MIN
V
R
I
MIN
I
R
T
C
†
R
S
§
Z
R
Reverse Breakdown Voltage
Minimum Operating Current
Recommended Operating
Current
Average Reverse Breakdown
Voltage Temp. Co.
Slope Resistance
Reverse Dynamic Impedance
2
I
R
=5mA
2.38
LIMITS
TYP MAX
2.45 2.52
2
120
3
V
mA
mA
TOL.
%
UNITS
15
I
R(min)
to
I
R(max)
I
R
= 5mA
f = 100Hz
I
AC
= 0.1 I
R
I
R
= 5mA
f = 10Hz to
10kHz
50
ppm/°C
Ω
Ω
0.26 0.5
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
)
4-170
PCB Design
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