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ADR318ARJ-REEL-ADR318ARJ-REEL7
1.8 V Precision Voltage Reference
REV.0
Precision Low Drift SOT-23
Voltage Reference with Shutdown*. Patent No. 5,969,657; other patents pending.
FEATURES
Initial Accuracy: �5 mV Max, �0.27% Max
Low Temperature Coefficient: 25 ppm/�C Max
Load Regulation: 100 ppm/mA
Line Regulation: 25 ppm/V
Low Supply Headroom: 0.6 V
Wide Operating Range: (VOUT + 0.6 V) to 15 V
Low Power: 120 �A Max
Shutdown to Less than 3 �A Max
Output Current: 5 mA
Wide Temperature Range: 0�C to 70�C
Tiny 5-Lead SOT-23 Package
APPLICATIONS
Battery Powered Instrumentation
Portable Medical Instruments
Data Acquisition Systems
Industrial Process Control Systems
Fault Protection Critical Systems
GENERAL DESCRIPTIONThe ADR318 is a precision 1.8 V band gap voltage reference
featuring high accuracy, high stability, and low power consump-
tion in a tiny footprint. Patented temperature drift curvature
correction techniques minimize nonlinearity of the voltage change
with temperature. The wide operating range and low power con-
sumption with additional shutdown capability make the part ideal
for battery powered applications. The VOUT (SENSE) pin enables
greater accuracy by supporting full Kelvin operation in PCBs
employing thin or long traces.
The ADR318 is a low dropout voltage (LDV) device that provides
a stable output voltage from supplies as low as 600 mV above
the output voltage. This device is specified over the industrial
operating range of 0°C to 70°C, and is available in the tiny
5-lead SOT-23 package.
The combination of VOUT (SENSE) and shutdown functions also
enables a number of unique applications, combining precision
reference/regulation with fault decision and overcurrent protection.
Details are provided in the Applications section.
PIN CONFIGURATION
5-Lead SOT-23
ADR318–SPECIFICATIONS
ELECTRICAL CHARACTERISTICSMinimum Supply Voltage Headroom
Output Voltage Hysteresis
Shutdown Supply Current
Shutdown Logic Low
NOTESTMIN = 0°C, TMAX = 70°CThe long-term stability specification is noncumulative. The drift in subsequent 1,000 hour periods is significantly lower than in the first 1,000 hour period.
Specifications subject to change without notice.
(TA = TMIN to TMAX,1 VIN = 5 V, unless otherwise noted.)
ABSOLUTE MAXIMUM RATINGS1, 2Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 V
Output Short-Circuit Duration
to GND . . . . . . . . . . . . . . . . . . . . .Observe Derating Curves
Storage Temperature Range
RJ Package . . . . . . . . . . . . . . . . . . . . . . . . .–65°C to +125°C
Operating Temperature Range . . . . . . . . . . . . . . .0°C to 70°C
Junction Temperature Range
RJ Package . . . . . . . . . . . . . . . . . . . . . . . . .–65°C to +150°C
Lead Temperature Range
Soldering, 60 sec . . . . . . . . . . . . . . . . . . . . . . . . . . . .300°C
NOTES
1Absolute maximum ratings apply at 25°C, unless otherwise noted.
2Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent 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.
ORDERING GUIDE
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
ADR318 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.
ADR318–Typical Performance CharacteristicsTPC 1.Typical Output Voltage
vs. Temperature
TPC 4.Line Regulation vs.
Temperature
TPC 7.Typical Output Voltage
Noise 10 Hz to 10 kHz
TPC 2.Supply Current vs.
Input Voltage
TPC 5.Minimum Input Voltage
vs. Load Current
TPC 8.Line Transient
Response, CBYPASS = 0 µF
TPC 3.Load Regulation vs.
Temperature
TPC 6.Typical Output Voltage
Noise 0.1 Hz to 10 Hz
TPC 9.Line Transient
Response, CBYPASS = 0.1 µF
TPC 10.Load Transient Response,
CL = 0 nF
TPC 13.Turn On/Turn Off
Response at 5 V, RLOAD = 1.8 kΩ
TPC 11.Load Transient Response,
CL = 1 nF
TPC 14.Turn On/Turn Off Response
at 5 V, RLOAD = 1.8 kΩ, CBYPASS = 0.1 µF
TPC 12.Load Transient Response,
CL = 100 nF
TPC 15.Shutdown Pin Response
ADR318
PARAMETER DEFINITIONS
Temperature CoefficientTemperature coefficient is 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 with the following equation:(1)
where:
VO(25°C) = VO at 25°C
VO(T1) = VO at temperature 1
VO(T2) = VO at temperature 2
Long Term StabilityLong term stability is the typical shift of output voltage at 25°C
on a sample of parts subjected to a test of 1,000 hours at 25°C:
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 HysteresisThermal hystereses is defined as the change of output voltage
after the device is cycled through temperature 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 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 +125°C and back to +25°C
THEORY OF OPERATIONBand gap references are the high performance solution for low
supply voltage and low power voltage reference applications,
and the ADR318 is no exception. The uniqueness of this product
lies in its architecture. By observing Figure 1, the ideal zero TC
band gap voltage is referenced to the output, not to ground.
Therefore, if noise exists on the ground line, it will be greatly
attenuated on VOUT. The band gap cell consists of the PNP pair
Q51 and Q52, running at unequal current densities. The difference
in VBE results in a voltage with a positive TC that is amplified by
the ratio of 2 � R58/R54. This PTAT voltage, combined with
the VBEs of Q51 and Q52, produces the stable band gap voltage.
Reduction in band gap curvature is performed by the ratio of
the resistors R44 and R59, one of which is linearly temperature
dependent. Precision laser trimming and other patented circuit
techniques are used to further enhance the drift performance.
Figure 1.Simplified Schematic
Device Power Dissipation ConsiderationsThe ADR318 is capable of delivering load currents up to 5 mA
with an input voltage that ranges from 2.4 V to 15 V. When this
device is used in applications with high input voltages, care should
be taken to avoid exceeding the specified maximum power dissi-
pation or junction temperature that could result in premature
device failure. The following formula should be used to calculate
the device’s maximum junction temperature or dissipation:
In Equation 4, TJ and TA are, respectively, the junction and
ambient temperatures, PD is the device power dissipation, and
θJA is the device package thermal resistance.
Shutdown Mode OperationThe ADR318 includes a shutdown feature that is TTL/CMOS
compatible. A logic LOW or a 0 V condition on the SHDN pin
is required to turn the device off. During shutdown, the output
of the reference becomes a high impedance state where its potential
would then be determined by external circuitry. If the shutdown
