PRECISION 2.5 VOLT MICROPOWER
VOLTAGE REFERENCE
ISSUE 3 - MARCH 1998
ZR4040-2.5
DEVICE DESCRIPTION
The ZR4040-2.5 uses a bandgap circuit
design to achieve a precision micropower
voltage reference of 2.5 volts. The device is
available in small outline surface mount
packages, ideal for applications where space
saving is important, as well as packages for
through hole requirements.
The ZR4040-2.5 design provides a stable
voltage without an external capacitor and is
stable with capacitive loads. The ZR4040-2.5
is recommended for operation between
60µA and 15mA and so is ideally suited to
l o w po w er an d ba tt e ry p owe re d
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.
FEATURES
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Small outline SO8 and SOT23 packages
TO92 style package
No stabilising capacitor required
Typical T
C
30ppm/°C
Typical slope resistance 0.4Ω
2% 1% and 0.5 % tolerance
Industrial temperature range
Operating current 60µA to 15mA
Transient response, stable in less than
10µs
APPLICATIONS
Battery powered and portable
equipment.
Metering and measurement systems.
Instrumentation.
Test equipment.
Data acquisition systems.
Precision power supplies.
SCHEMETIC DIAGRAM
V
R
G
nd
4-173
ZR4040-2.5
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
SO8
625mW
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
LIMITS
TYP
MAX
2.5125 0.5
2.525 1
2.55
2
60
15
30
I
R(min)
to
I
R(max)
0.4
0.3
2
0.8
Ω
Ω
100
V
TOL.
%
UNITS
2.4875 2.5
2.475 2.5
2.45
2.5
25
0.06
I
MIN
I
R
T
C
†
Minimum Operating Current
Recommended Operating
Current
Average Reverse
Breakdown Voltage Temp.
Co.
Slope Resistance
Reverse Dynamic Impedance I
R
= 1mA
f = 100Hz
I
AC
= 0.1 I
R
Wideband Noise Voltage
I
R
= 1mA
f = 10Hz to
10kHz
µA
mA
ppm/°C
R
S
§
Z
R
E
N
45
µV
(rms)
†
T
C
=
(
V
R
(
max
)
−
V
R
(
min
)
)
x
1000000
Reverse Current (µA)
60
50
40
30
20
10
0
0.2
0.6
1.0
1.4
1.8
2.2
2.6
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.
§
V
R
Change
(
I
R
(
min
)
to I
R
(
max
))
R
S
=
I
R
(
max
) −
I
R
(
min
)
5°C
=8
T
A
5°C
C
=2
T
A
-40°
=
T
A
Reverse Voltage (V)
Reverse Characteristics
4-174
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