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 u r f a c e m o u n t p a c k a g e s , i d e a l fo r
a p p l i c a t i o n s w h e re s p a c e s a v i n g 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.
FEATURES
Small outline SO8 and TO92
style packages
No stabilising capacitor required
Typical T
C
15ppm/C
Typical slope resistance 0.26
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.
PRECISION 2.45 VOLT
VOLTAGE REFERENCE
ISSUE 2 -- FEBRUARY 1998
ZR404
V
R
G
nd
1.25V
REF
SCHEMATIC DIAGRAM
4-169
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
SO8
625mW
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
2.38
2.45 2.52
3
V
I
MIN
Minimum Operating Current
2
mA
I
R
Recommended Operating
Current
2
120
mA
T
C
Average Reverse Breakdown
Voltage Temp. Co.
I
R(min)
to
I
R(max)
15
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)
ZR404
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
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