Zetex ZXRE125DN8, ZXRE125DR, ZXRE125EF, ZXRE125EN8, ZXRE125ER Datasheet
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SOT23 MICROPOWER 1.22V VOLTAGE REFERENCE
DESCRIPTION
The ZXRE125 is a bandgap circuit designed to achieve
a precision micropower voltage reference of 1.22
volts. The device is available in the small outline
SOT23 surface mount package which is ideal for
applications where space saving is important.
SOT23 tolerance is available to 0.5% for precision
applications. Excellent performance is maintained
over the 30µA to 5mA operating current range with a
FEATURES
• High performance replacement for ZRA124 and
ZRA125 references
• Small outline SOT23
• SO8 and E-Line alternatives available
• 30µA knee current
• 20ppm/°C typical temperature coefficient
• Unconditionally stable
• 0.5%, 1%, 2% and 3% tolerance
• Contact Zetex marketing for availability of tighter
tolerance devices
typical temperature coefficient of only 20ppm/°C. The
device has been designed to be highly tolerant of
capacitive loads so maintaining excellent stability.
This device offers a SOT23 pin for pin compatible
replacement of the ZRA124 and ZRA125 series of
voltage references. SO8 and E-Line (TO92 style)
packages can also be made available.
• Battery powered equipment
• Precision power supplies
• Portable instrumentation
• Portable communications devices
• Notebook and palmtop computers
• Data acquisition systems
• A/D and D/A converters
• Test equipment
ZXRE125
SCHEMATIC DIAGRAM APPLICATIONS CIRCUIT
V
R
G
nd
Low quiescent reference from a 1.5V battery source.
APPLICATIONS
ISSUE 4 - JANUARY 2002
1
1.5V
4k7
1.22V
ZXRE125
ABSOLUTE MAXIMUM RATINGS
Reverse Current 30mA
Forward Current 10mA
Operating temperature. -40 to 85°C
Storage temperature. -55 to 125°C
Power Dissipation (T
SOT23 330mW
SO8 625mW
E-Line 500mW
amb
=25°C)
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) T
SYMBOL PARAMETER CONDITIONS LIMITS TOL. % UNITS
V
R
I
MIN
I
R
T
† Average Reverse Breakdown
C
∆V
R
∆I
R
Z
R
E
N
Reverse Breakdown Voltage
=100µA
I
R
Minimum Knee Current 30
Recommended Operating
Current Range
I
to
Voltage Temperature
Coefficient
Reverse Breakdown Voltage
change with Current
R(min)
I
R(max)
=30µA to 1mA
I
R
=1mA to 5mA
I
R
Reverse Dynamic Impedance IR =1mA
f =100Hz
=0.1 I
I
AC
Wideband Noise Voltage
=8µA to
I
R
100µA
f=10Hz to 10kHz
=25°C
amb
MIN TYP MAX
1.214
1.208
1.196
1.183
1.22
1.22
1.22
1.22
1.226
1.232
1.244
1.257
0.5 ‡
1
2
3
V
µA
0.03 5 mA
20 90 ppm/°C
1
10
0.2 0.6
R
60
mV
mV
Ω
µV(rms)
(V
† T
Note: V
maximum deviation in reference
R (max )−VR ( min )
=
C
R(max)
V
- V
x (T
R
R(min)
) x 1000000
(max )−T(min )
is the
)
voltage measured over the full
operating temperature range.
‡ Note: 0.5% SOT23 only.
5
4
3
2
1
Reverse Current (mA)
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
TA=-40c TO +85C
Reverse Voltage (V)
Reverse Characteristics
ISSUE 4 - JANUARY 2002
2
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