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ADR291GRU ,Precision, Micropower 2.5 V XFET™ ReferenceGENERAL DESCRIPTION 12 µA, making these devices ideal for battery-powered instrumen-The ADR291 and ..
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ADR291
Precision, Micropower 2.048 V XFET Reference
PIN CONFIGURATIONS
8-Lead Narrow Body SO (SO Suffix)
8-Lead TSSOP (RU Suffix)REV.B
Low Noise Micropower
2.048 V, 2.5 V, and 4.096 V
Precision Voltage References
FEATURES
Supply Range
2.35 V to 15 V, ADR290
2.8 V to 15 V, ADR291
4.4 V to 15 V, ADR292
Supply Current 12 �A Max
Low-Noise 6 �V, 8 �V, 12 �V p-p (0.1 Hz–10 Hz)
High Output Current 5 mA
Temperature Range �40�C to �125�C
Pin Compatible with REF02/REF19x
APPLICATIONS
Portable Instrumentation
Precision Reference for 3 V and 5 V Systems
A/D and D/A Converter Reference
Solar-Powered Applications
Loop-Current-Powered Instruments
GENERAL DESCRIPTIONThe ADR290, ADR291 and ADR292 are low noise, micro-
power precision voltage references that use an XFET® reference
circuit. The new XFET architecture offers significant perfor-
mance improvements over traditional bandgap and Buried
Zener-based references. Improvements include: one quarter the
voltage noise output of bandgap references operating at the
same current, very low and ultralinear temperature drift, low
thermal hysteresis and excellent long-term stability.
The ADR29x family are series voltage references providing stable
and accurate output voltages from supplies as low as 2.35 V for the
ADR290. Output voltage options are 2.048 V, 2.5 V, and 4.096 V
for the ADR290, ADR291, and ADR292 respectively. Quiescent
XFET is a registered trademark of Analog Devices, Inc.
current is only 12 µA, making these devices ideal for battery-
powered instrumentation. Three electrical grades are available
offering initial output accuracies of ±2 mV, ±3 mV and ±6 mV
max for the ADR290 and ADR291, and ±3 mV, ±4 mV and
±6 mV max for the ADR292. Temperature coefficients for the
three grades are 8 ppm/°C, 15 ppm/°C, and 25 ppm/°C max,
respectively. Line regulation and load regulation are typically
30 ppm/V and 30 ppm/mA, maintaining the reference’s overall
high performance. For a device with 5.0 V output, refer to the
ADR293 data sheet.
The ADR290, ADR291, and ADR292 references are specified
over the extended industrial temperature range of –40°C to
+125°C. Devices are available in the 8-lead SOIC and 8-lead
TSSOP packages.
ADR29x Product
ADR290/ADR291/ADR292
ADR290–SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
ELECTRICAL SPECIFICATIONSLINE REGULATION
ELECTRICAL SPECIFICATIONSLINE REGULATION
(VS = 2.7 V, TA = +25�C unless otherwise noted)
(VS = 2.7 V, TA = �40�C ≤ TA ≤ +125�C unless otherwise noted)
(VS = 2.7 V, TA = –25�C ≤ TA ≤ +85�C unless otherwise noted)
ADR291–SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
ADR290/ADR291/ADR292
(VS = 3.0 V, TA = +25�C unless otherwise noted)
(VS = 3.0 V, TA = –40�C ≤ TA ≤ +125�C unless otherwise noted)
(VS = 3.0 V, TA = –25�C ≤ TA ≤ +85�C unless otherwise noted)
ADR290/ADR291/ADR292
ADR292–SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
(VS = 5 V, TA = +25�C unless otherwise noted)
(VS = 5 V, TA = –40�C ≤ TA ≤ +125�C unless otherwise noted)
(VS = 5 V, TA = –25�C ≤ TA ≤ +85�C unless otherwise noted)
ABSOLUTE MAXIMUM RATINGSSupply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V
Output Short-Circuit Duration to GND. . . . . . . . . . Indefinite
Storage Temperature Range
SO, RU Package. . . . . . . . . . . . . . . . . . . �65°C to �150°C
Operating Temperature Range
ADR290/ADR291/ADR292. . . . . . . . . . . �40°C to �125°C
Junction Temperature Range
SO, RU Package. . . . . . . . . . . . . . . . . . . �65°C to �125°C
Lead Temperature (Soldering, 60 sec). . . . . . . . . . . . . 300°C
NOTESStresses above those listed under Absolute Maximum Ratings may
cause permanent damage to the device. This is a stress rating only; functional
operation at or above this specification is not implied. Exposure to the
above maximum rating conditions for extended periods may affect device
reliability.
2. Remove power before inserting or removing units from their sockets.
*θJA is specified for worst-case conditions, i.e., θJA is specified for device in socket
testing. In practice, θJA is specified for a device soldered in the circuit board.
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADR290/ADR291/ADR292 features proprietary ESD protection circuitry, perma-
nent 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.
ORDERING GUIDESee ADR293 data sheet for ordering guide.
OTHER XFET PRODUCTS
ADR290/ADR291/ADR292
PARAMETER DEFINITION
Line RegulationThe change in output voltage due to a specified change in input
voltage. It includes 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 RegulationThe change in output voltage due to a specified change in load
current. It includes the effects of self-heating. Load regulation
is expressed in either microvolts-per-milliampere, parts-per-
million-per-milliampere, or ohms of dc output resistance.
Long-Term StabilityTypical shift of output voltage at 25°C on a sample of parts
subjected to high-temperature operating life test of 1000
hours at 125°C.
Where
VO (t0) = VO at 25°C at time 0
VO (t1) = VO at 25°C after 1000 hours operation at 125°C
Temperature CoefficientThe change of output voltage over the operating temperature
change and normalized by the output voltage at 25°C, expressed
in ppm/°C. The equation follows:
Where
VO (25°C) = VO at 25°C
VO(T1) = VO at Temperature 1
VO(T2) = VO at Temperature 2
NC = No Connect
(There are in fact internal connections at NC pins which are
reserved for manufacturing purposes. Users should not connect
anything at NC pins.)
Thermal HysteresisThermal hysteresis is defined as the change of output voltage af-
ter the device is cycled through temperature from +25°C to
–40°C to +85°C and back to +25°C. This is a typical value from
a sample of parts put through such a cycle.
Where
VO (25°C) = VO at 25°C
VO–TC = VO at 25°C after temperature cycle at +25°C to
–40°C to +85°C and back to +25°C
TPC 1.ADR290 VOUT vs. Temperature
TPC 2.ADR291 VOUT vs. Temperature
TPC 3.ADR292 VOUT vs. Temperature
TPC 4.ADR290 Quiescent Current vs. Input Voltage
TPC 5.ADR291 Quiescent Current vs. Input Voltage
TPC 6.ADR292 Quiescent Current vs. Input Voltage
ADR290/ADR291/ADR292TPC 7.ADR290/ADR291/ADR292 Supply Current vs.
Temperature
TPC 8.ADR290/ADR291/ADR292 Line Regulation vs.
Temperature
TPC 9.ADR290/ADR291/ADR292 Line Regulation vs.
Temperature
TPC 10.ADR290 Minimum Input-Output Voltage
Differential vs. Load Current
TPC 11.ADR291 Minimum Input-Output Voltage
Differential vs. Load Current
TPC 12.ADR292 Minimum Input-Output Voltage
Differential vs. Load Current
