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ADR390BUJZ-REEL7-ADR391AUJZ-REEL7-ADR391BUJZ-REEL7-ADR395AUJZ-REEL7-ADR395BUJZ-REEL7
2.048 V Micropower, Low Noise Precision Voltage References with Shutdown
Micropower, Low Noise Precision
Voltage References with
Shutdown
Rev. E
FEATURES
Compact TSOT-23-5 packages
Low temperature coefficient
B grade: 9 ppm/°C
A grade: 25 ppm/°C
Initial accuracy
B grade: +4 mV maximum
A grade: +6 mV maximum
Ultralow output noise: 5 µV p-p (0.1 Hz to 10 Hz)
Low dropout: 300 mV
Low supply current
3 µA maximum in shutdown
120 µA maximum in operation
No external capacitor required
Output current: 5 mA
Wide temperature range
−40°C to + 125°C
APPLICATIONS
Battery-powered instrumentations
Portable medical instrumentations
Data acquisition systems
Industrial process controls
Automotive
FUNCTIONAL BLOCK DIAGRAM
SHDN
VIN
VOUT (SENSE)
GND
VOUT (FORCE)00419-D-001
Figure 1. 5-Lead TSOT (UJ Suffix)
Table 1. Contact Analog Devices, Inc. for other voltage options.
GENERAL DESCRIPTION The ADR390, ADR391, ADR392, and ADR395 are precision
2.048 V, 2.5 V, 4.096 V, and 5 V band gap voltage references
that feature low power and high precision in a tiny footprint.
Using ADI’s patented temperature drift curvature correction
techniques, the ADR39x references achieve a low 9 ppm/°C of
temperature drift in the TSOT package.
The ADR39x family of micropower, low dropout voltage
references provides a stable output voltage from a minimum
supply of 300 mV above the output. Their advanced design
eliminates the need for external capacitors, which further
reduces board space and system cost. The combination of
low power operation, small size, and ease of use makes the
ADR39x precision voltage references ideally suited for battery-
operated applications.
TABLE OF CONTENTS ADR390—Specifications.................................................................3
ADR391—Specifications.................................................................4
ADR392—Specifications.................................................................5
ADR395—Specifications.................................................................6
Absolute Maximum Ratings............................................................7
Thermal Resistance......................................................................7
ESD Caution..................................................................................7
Terminology......................................................................................8
Typical Performance Characteristics.............................................9
Theory of Operation......................................................................16
Applications.....................................................................................17
Basic Voltage Reference Connection.......................................17
Outline Dimensions.......................................................................19
Ordering Guide...........................................................................19
REVISION HISTORY
4/04—Data Sheet Changed from Rev. D to Rev. E Changes to ADR390—Specifications............................................3
Changes to ADR391—Specifications............................................4
Changes to ADR392—Specifications............................................5
Changes to ADR395—Specifications............................................6
4/04—Data Sheet Changed from Rev. C to Rev. D Updated Format.................................................................Universal
Changes to Title...............................................................................1
Changes to Features........................................................................1
Changes to Applications.................................................................1
Changes to General Description...................................................1
Changes to Table 1...........................................................................1
Changes to ADR390—Specifications............................................3
Changes to ADR391—Specifications............................................4
Changes to ADR392—Specifications............................................5
Changes to ADR395—Specifications............................................6
Changes to Absolute Maximum Ratings......................................7
Changes to Thermal Resistance.....................................................7
Moved ESD Caution.......................................................................7
Changes to Figure 3, Figure 4, Figure 7, and Figure 8.................9
Changes to Figure 11, Figure 12, Figure 13, and Figure 14......10
Changes to Figure 15, Figure 16, Figure 19, and Figure 20......11
Changes to Figure 23 and Figure 24............................................12
Changes to Figure 27.....................................................................13
Changes to Ordering Guide.........................................................19
Updated Outline Dimensions......................................................19
10/02—Data Sheet Changed from Rev. B to Rev. C Add parts ADR392 and ADR395....................................Universal
Changes to Features........................................................................1
Changes to General Description...................................................1
Additions to Table I.........................................................................1
Changes to Specifications...............................................................2
Changes to Ordering Guide...........................................................4
Changes to Absolute Maximum Ratings......................................4
New TPCs 3, 4, 7, 8, 11, 12, 15, 16, 19, and 20...............................6
New Figures 4 and 5......................................................................13
Deleted A Negative Precision Reference
without Precision Resistors Section............................................13
Edits to General-Purpose Current Source Section...................13
Updated Outline Dimensions......................................................15
5/02—Data Sheet Changed from Rev. A to Rev. B Edits to Layout...................................................................Universal
Changes to Figure 6.......................................................................13
ADR390—SPECIFICATIONS Electrical Characteristics, VIN = 2.5 V to 15 V, TA = 25°C, unless otherwise noted.
Table 2. The long-term stability specification is noncumulative. The drift subsequent 1,000 hour periods is significantly lower than in the first 1,000 hour period.
ADR391—SPECIFICATIONS
Electrical characteristics, VIN = 2.8 V to 15 V, TA = 25°C, unless otherwise noted.
Table 3.
1 The long-term stability specification is noncumulative. The drift subsequent 1,000 hour periods is significantly lower than in the first 1,000 hour period.
ADR392—SPECIFICATIONS
Electrical characteristics, VIN = 4.3 V to 15 V, TA = 25°C, unless otherwise noted.
Table 4.
The long-term stability specification is noncumulative. The drift subsequent 1,000 hour periods is significantly lower than in the first 1,000 hour period.
ADR395—SPECIFICATIONS
Electrical characteristics, VIN = 5.3 V to 15 V, TA = 25°C, unless otherwise noted.
Table 5.
The long-term stability specification is noncumulative. The drift subsequent 1,000 hour periods is significantly lower than in the first 1,000 hour period.
ABSOLUTE MAXIMUM RATINGS
At 25°C, unless otherwise noted.
Table 6.
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 indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, i.e., θJA is specified
for a device soldered in a circuit board for surface-mount
packages.
Table 7. Thermal Resistance
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.
TERMINOLOGY
Temperature Coefficient
The change of output voltage with respect to operating
temperature changes normalized by the output voltage at 25°C.
This parameter is expressed in ppm/°C and can be determined
by the following equation: ()()()()10–25××°=°2OO2OTTCVVTVCppm/TCV
where:
VO (25°C) = VO at 25°C
VO (T1) = VO at Temperature 1
VO (T2) = VO at Temperature 2
Line Regulation
The change in output voltage due to a specified change in input
voltage. This parameter accounts for the effects of self-heating.
Line regulation is expressed in either percent per volt, parts-
per-million per volt, or microvolts per volt change in input
voltage.
Load Regulation
The change in output voltage due to a specified change in load
current. This parameter accounts for the effects of self-heating.
Load regulation is expressed in either microvolts per milli-
ampere, parts-per-million per milliampere, or ohms of dc
output resistance.
Long-Term Stability
Typical shift of output voltage at 25°C on a sample of parts
subjected to a test of 1,000 hours at 25°C.
∆VO = VO(t0) – VO(t1) ()()()⎟⎠⎜⎝×=∆610–OO0OtVVtVppmV
where:
VO (T0) = VO at 25°C at Time 0
VO (T1) = VO at 25°C after 1,000 hours operation at 25°C
Thermal Hysteresis
The change of output voltage after the device is cycled through
temperatures from +25°C to –40°C to +125°C and back to
+25°C. This is a typical value from a sample of parts put
VO_HYS = VO(25°C) – VO_TC )()1025×°=CVCVppmV
O_TCO
O_HYS
where:
VO (25°C) = VO at 25°C
VO_TC = VO at 25°C after a temperature cycle from + 25°C
to –40°C to +125°C and back to +25°C
NOTES
Input Capacitor
Input capacitors are not required on the ADR39x. There is no
limit for the value of the capacitor used on the input, but a
1 µF to 10 µF capacitor on the input will improve transient
response in applications where the supply suddenly changes.
An additional 0.1 µF in parallel will also help reduce noise
from the supply.
Output Capacitor
The ADR39x does not require output capacitors for stability
under any load condition. An output capacitor, typically 0.1 µF,
will filter out any low level noise voltage and will not affect the
operation of the part. On the other hand, the load transient
response can improve with an additional 1 µF to 10 µF output
capacitor in parallel. A capacitor here will act as a source of
stored energy for a sudden increase in load current. The only
parameter that will degrade by adding an output capacitor is the
turn-on time, and it depends on the size of the capacitor chosen.
DRIFT (ppm)
TIME (Hours)
100
00419-D-002
Figure 2. ADR391 Typical Long-Term Drift over 1,000 Hours
TYPICAL PERFORMANCE CHARACTERISTICS
TEMPERATURE (°C)
OUTPUT VOLTAGE
2.060
Figure 3. ADR390 Output Voltage vs. Temperature
OUT
(V
TEMPERATURE (°C)
Figure 4. ADR391 Output Voltage vs. Temperature
TEMPERATURE (°C)
OUT
(V
4.092
Figure 5. ADR392 Output Voltage vs. Temperature
OUT
(V
TEMPERATURE (°C)
Figure 6. ADR395 Output Voltage vs. Temperature
INPUT VOLTAGE (V)
CURRE
NT (
100
Figure 7. ADR390 Supply Current vs. Input Voltage
INPUT VOLTAGE (V)
CURRE
NT (
100
Figure 8. ADR391 Supply Current vs. Input Voltage
INPUTVOLTAGE(V)
CURRE
NT (
100
Figure 9. ADR392 Supply Current vs. Input Voltage
INPUTVOLTAGE(V)
CURRE
T (
100
00419-D-010
Figure 10. ADR395 Supply Current vs. Input Voltage
TEMPERATURE (°C)
LOAD REGULATION (ppm/mA)
120
Figure 11. ADR390 Load Regulation vs. Temperature
TEMPERATURE (°C)
LOAD RE
GULATION (ppm/mA)
180
Figure 12. ADR391 Load Regulation vs. Temperature
TEMPERATURE (°C)
LOAD REGULATION (ppm/mA)
Figure 13. ADR392 Load Regulation vs. Temperature
TEMPERATURE (°C)
AD REGULA
TION (ppm/mA)
Figure 14. ADR395 Load Regulation vs. Temperature
