PRECISION 4.0 VOLT MICROPOWER
VOLTAGE REFERENCE
ISSUE 2 - MARCH 1998
ZRA400
FEATURES
DEVICE DESCRIPTION
The ZRA400 uses a bandgap circuit design
to achieve a precision micropower voltage
reference of 4.096 volts. The device is
available in small outline surface mount
packages, ideal for applications where space
saving is important.
The ZRA400 design provides a stable voltage
without an external capacitor and is stable
with capacitive loads. The ZRA400 is
recommended for operation between 50µA
and 5mA and so is ideally suited to low
power and battery powered applications.
Excellent performance is maintained to an
absolute maximum of 25mA, however the
rugged design and 20 volt processing allows
the reference to withstand transient effects
and currents up to 200mA. Superior
switching capability allows the device to
reach stable operating conditions in only a
few microseconds.
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Small outline SO8, SOT23 and TO92
style packages.
No stabilising capacitor required
Typical T
C
15ppm/°C
Typical slope resistance 0.55Ω
±
3%, 2% and 1% tolerance
Industrial temperature range
Operating current 50µA to 5mA
APPLICATIONS
Battery powered and portable
equipment.
Metering and measurement systems.
Instrumentation.
Test equipment.
Data acquisition systems.
Precision power supplies.
Crystal oscillators
SCHEMATIC DIAGRAM
V
R
G
nd
4-237
ZRA400
ABSOLUTE MAXIMUM RATING
Reverse Current
Forward Current
Operating Temperature
Storage Temperature
25mA
25mA
-40 to 85°C
-55 to 125°C
Power Dissipation (T
amb
=25°C)
SOT23
330mW
E-Line, 3 pin (TO92)
500mW
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
Reverse Breakdown Voltage I
R
=150µA
4.05
4.01
3.97
LIMITS
TYP
MAX
1
2
3
V
TOL.
%
UNITS
4.096 4.14
4.096 4.18
4.096 4.22
25
50
5
15
0.55
0.5
50
2
1.2
I
MIN
I
R
T
C
†
R
S
§
Z
R
Minimum Operating Current
Recommended Operating
Current
Average Reverse Breakdown
Voltage Temp. Co.
I
R(min)
to
I
R(max)
Slope Resistance
Reverse Dynamic
Impedance
Wideband Noise Voltage
I
R
= 1mA
f = 100Hz
I
AC
= 0.1 I
R
I
R
= 1mA
f = 10Hz to
10kHz
0.05
µA
mA
ppm/°C
Ω
Ω
E
N
90
µV(rms)
†
T
C
=
(
V
R
(
max
)
−
V
R
(
min
)
)
x
1000000
Reverse Current (µA)
50
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.
40
30
T
A
=85°C
T
A
=25°C
T
A
=-40°C
§
R
S
=
V
R
Change
(
I
R
(
min
)
to I
R
(
max
))
I
R
(
max
) −
I
R
(
min
)
20
10
0
0
2.0
4.0
Reverse Voltage (V)
Reverse Characteristics
4-238
ZRA400
CONNECTION DIAGRAMS
E-Line, 2 pin Package Suffix – Y
E-Line, 3 pin,Rev Package Suffix – R
Bottom View
Bottom View –
Pin 3 floating or connected to pin 1
E-Line, 3 pin Package Suffix – A
SO8 Package Suffix – N8
Bottom View –
Pin 1 floating or connected to pin 3
Top View
SOT23 Package Suffix – F
Top View –
Pin 1 floating or connected to pin 2
4-240
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