PRECISION 4.096 VOLT LOW KNEE CURRENT
VOLTAGE REFERENCE
ISSUE 4 - JANUARY 2003
DEVICE DESCRIPTION
The ZRC400 uses a bandgap circuit design to
achieve a precision micropower voltage
reference of 4.096 volts. The device is
available in a small outline surface mount
package, ideal for applications where space
saving is important, as well as packages for
through hole requirements.
The ZRC400 design provides a stable voltage
without an external capacitor and is stable
with capacitive loads. The ZRC400 is
recommended for operation between 23µA
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
an d cu rrents up to 200mA. Superior
switching capability allows the device to
reach stable operating conditions in only a
few microseconds.
ZRC400
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Small outline SOT23 and TO92 style
packages
No stabilising capacitor required
Low knee current, 18µA typical
Typical T
C
30ppm/°C
Typical slope resistance 0.4Ω
±
3%, 2% and 1% tolerance
Industrial temperature range
Operating current 23µA to 5mA
Transient response, stable in less than
10µs
Optional extended current range
APPLICATIONS
Battery powered and portable
equipment.
Instrumentation.
Test equipment.
Metering and measurement systems.
SCHEMATIC DIAGRAM
V
R
G
nd
4-257
ZRC400
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
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) T
amb
=25°C
SYMBOL PARAMETER
CONDITIONS
MIN
V
R
Reverse Breakdown Voltage
I
R
=150µA
4.055
4.014
3.973
LIMITS
TYP
4.096
4.096
4.096
18
0.023
30
I
R(min)
to
I
R(max)
0.4
0.3
MAX
4.137
4.178
4.219
23
5
90
2
0.8
TOL.
%
1
2
3
UNITS
V
I
MIN
I
R
T
C
†
R
S
§
Z
R
Minimum Operating Current
Recommended Operating
Current
Average Reverse Breakdown
Voltage Temp. Co.
Slope Resistance
Reverse Dynamic Impedance
µA
mA
ppm/°C
Ω
Ω
I
R
= 1mA
f = 100Hz
I
AC
= 0.1 I
R
I
R
= 150µA
f = 10Hz to
10kHz
40
E
N
Wideband Noise Voltage
90
µV(rms)
Reverse Current (uA)
†
T
C
=
(V
R
(
max
)
−V
R
(
min
)
)
x
1000000
V
R
x
(T
(
max
)
−T
(
min
)
)
30
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
)
20
25 °C
10
85 °C
-40 °C
0
0
1
2
3
4
5
Reverse Voltage (V)
Reverse Characteristics
4-258
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