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ADR520ART-REEL7 |ADR520ARTREEL7ADN/a4avaiHigh Precision Shunt Mode Voltage References
ADR520BKS-REEL7 |ADR520BKSREEL7ADN/a719avaiHigh Precision Shunt Mode Voltage References
ADR525ART-R2 |ADR525ARTR2ADN/a3000avaiHigh Precision Shunt Mode Voltage References
ADR525ART-REEL7 |ADR525ARTREEL7ADIN/a100avaiHigh Precision Shunt Mode Voltage References
ADR525BKS-REEL7 |ADR525BKSREEL7ADN/a675avaiHigh Precision Shunt Mode Voltage References
ADR525BRT-R2 |ADR525BRTR2ADN/a2764avaiHigh Precision Shunt Mode Voltage References
ADR525BRT-REEL7 |ADR525BRTREEL7ADIN/a25avaiHigh Precision Shunt Mode Voltage References
ADR530BRT-REEL7 |ADR530BRTREEL7ADN/a3000avaiHigh Precision Shunt Mode Voltage References
ADR540ART-REEL7 |ADR540ARTREEL7ADIN/a800avaiHigh Precision Shunt Mode Voltage References
ADR540ART-REEL7 |ADR540ARTREEL7ADN/a230avaiHigh Precision Shunt Mode Voltage References
ADR540BRT-REEL7 |ADR540BRTREEL7ADIN/a2500avaiHigh Precision Shunt Mode Voltage References
ADR540BRT-REEL7 |ADR540BRTREEL7ADN/a310avaiHigh Precision Shunt Mode Voltage References
ADR550ART-REEL7 |ADR550ARTREEL7ADN/a58avaiHigh Precision Shunt Mode Voltage References
ADR550ART-REEL7 |ADR550ARTREEL7ADIN/a42avaiHigh Precision Shunt Mode Voltage References
ADR550BRT-REEL7 |ADR550BRTREEL7ADIN/a15avaiHigh Precision Shunt Mode Voltage References


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ADR520ART-REEL7-ADR520BKS-REEL7-ADR525ART-R2-ADR525ART-REEL7-ADR525BKS-REEL7-ADR525BRT-R2-ADR525BRT-REEL7-ADR530BRT-REEL7-ADR540ART-REEL7-ADR540BRT-REEL7-ADR550ART-REEL7-ADR550BRT-REEL7
High Precision Shunt Mode Voltage References
High Precision Shunt Mode
Voltage References

Rev. A
FEATURES
Ultracompact SC70 and SOT-23 packages
Temperature coefficient: 40 ppm/°C (max)
2× the tempco improvement over the LM4040
Pin compatible with LM4040/LM4050
Initial accuracy: ±0.2%
Low output voltage noise: 14 µV p-p @ 2.5 V output
No external capacitor required
Operating current range: 50 µA to 10 mA
Industrial temperature range: −40°C to +85°C

APPLICATIONS
Portable, battery-powered equipment
Automotive
Power supplies
Data acquisition systems
Instrumentation and process control
Energy measurement

Table 1. Selection Guide
PIN CONFIGURATION

TRIM
Figure 1. 3-Lead SC70 (KS)
and 3-Lead SOT-23 (RT)
GENERAL DESCRIPTION

Designed for space-critical applications, the ADR520/ADR525/
ADR530/ADR540/ADR550 are high precision shunt voltage
references, housed in ultrasmall SC70 and SOT-23 packages.
These references feature low temperature drift of 40 ppm/°C, an
initial accuracy of better than 0.2%, and ultralow output noise
of 14 µV p-p.
Available in output voltages of 2.048 V, 2.5 V, 3.0 V, 4.096 V, and
5.0 V, the ADR5xx’s advanced design eliminates the need for
compensation by an external capacitor, yet the references are
stable with any capacitive load. The minimum operating current
increases from a mere 50 µA to a maximum of 10 mA. This low
operating current and ease of use make these references ideally
suited for handheld, battery-powered applications.
A TRIM terminal is available on the ADR5xx to allow adjustment
of the output voltage over a ±0.5% range, without affecting the
temperature coefficient of the device. This feature provides users
with the flexibility to trim out any system errors.
TABLE OF CONTENTS
Specifications.....................................................................................3
Absolute Maximum Ratings............................................................6
Parameter Definitions......................................................................7
Typical Performance Characteristics.............................................8
Theory of Operation......................................................................11
Applications................................................................................11
Outline Dimensions.......................................................................13
Ordering Guide...............................................................................14
REVISION HISTORY

11/03—Revision 0: Initial Version
12/03—Data Sheet Changed from REV. 0 to REV. A
Updated Outline Dimensions.......................................................13
Change to Ordering Guide............................................................14
SPECIFICATIONS
Table 2. ADR520 Electrical Characteristics @ IIN = 50 µA to 10 mA, TA = 25°C, unless otherwise noted

Guaranteed by design
Table 3. ADR525 Electrical Characteristics @ IIN = 50 µA to 10 mA, TA = 25°C, unless otherwise noted

Guaranteed by design
Table 4. ADR530 Electrical Characteristics @ IIN = 50 µA to 10 mA, TA = 25°C, unless otherwise noted

1Guaranteed by design
Table 5. ADR540 Electrical Characteristics @ IIN = 50 µA to 10 mA, TA = 25°C, unless otherwise noted


1Guaranteed by design
Table 6. ADR550 Electrical Characteristics @ IIN = 50 µA to 10 mA, TA = 25°C, unless otherwise noted

1Guaranteed by design
ABSOLUTE MAXIMUM RATINGS
Ratings apply at 25°C, unless otherwise noted.
Table 7.

θJA is specified for worst-case conditions, i.e., θJA is specified for devices
soldered on circuit boards for surface-mount packages. Contact factory for
latest information on release dates.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those listed in the operational sections
of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
PARAMETER DEFINITIONS
TEMPERATURE COEFFICIENT

Temperature coefficient is defined as the change in output
voltage with respect to operating temperature changes, and is
normalized by an output voltage of 25°C. This parameter is
expressed in ppm/°C, and is determined by the following
equation: ()()1025×−×°=⎥⎦⎢⎣12OO2OTTCVVTV
ppmTCV (1)
where:
VO(25°C) = VO at 25°C.
VO(T1) = VO at Temperature 1.
VO(T2) = VO at Temperature 2.
THERMAL HYSTERESIS

Thermal hysteresis is defined as the change in output voltage
after the device is cycled through temperatures ranging from
+25°C to –40°C, then to +85°C, and back to +25°C. The
following equation expresses a typical value from a sample of
parts put through such a cycle: )()__25°°=°VCVppmVCVVOO
HYSOOOHYSO
(2)
where:
VO(25°C) = VO at 25°C.
VO_TC = VO at 25°C after a temperature cycle from +25°C to
–40°C, then to +85°C, and back to +25°C.
TYPICAL PERFORMANCE CHARACTERISTICS
MINIMAL OPERATING CURRENT (µA)
EVER
SE VOLTA
GE (
0.55075100
Figure 2. Reverse Characteristics and Minimum Operating Current
IIN (mA)
NCE
LTAGE
CHANGE
(mV391215
Figure 3. ADR520 Reverse Voltage vs. Operating Current
IIN (mA)
REVERSE VOLTAGE CHANGE (mV)915612
IIN (mA)
NCE
LTAGE
CHANGE
(mV121539
Figure 5. ADR550 Reverse Voltage vs. Operating Current
Figure 6. ADR525 Turn-On Response
TIME (µs)

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