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ADR510ART-REEL7 ,1.0 V Precision Low Noise Shunt Voltage Referenceapplications.VSRI + IL Q BIASILV = 1.0VOUTIADR510 QCOUT(OPTIONAL)V – VS OUTR = BIASI + IL QFigure ..
ADR512ART-REEL7 ,1.2 V Precision Low Noise Shunt Voltage ReferenceSpecifications subject to change without notice.ABSOLUTE MAXIMUM RATINGS* 1 2Package Type UnitJ ..
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ADR510ART-R2-ADR510ART-REEL7
1.0 V Precision Low Noise Shunt Voltage Reference
REV.0
1.0 V Precision Low Noise
Shunt Voltage Reference
FEATURES
Precision 1.000 V Voltage Reference
Ultracompact 3 mm � 3 mm SOT-23 Package
No External Capacitor Required
Low Output Noise: 4 �V p-p (0.1 Hz to 10 Hz)
Initial Accuracy: �0.35% Max
Temperature Coefficient: 70 ppm/�C Max
Operating Current Range: 100 �A to 10 mA
Output Impedance: 0.3 � Max
Temperature Range: –40�C to +85�C
APPLICATIONS
Precision Data Acquisition Systems
Battery-Powered Equipment:
Cellular Phone, Notebook Computer, PDA,
and GPS
3 V/5 V, 8-/12-Bit Data Converters
Portable Medical Instruments
Industrial Process Control Systems
Precision Instruments
GENERAL DESCRIPTIONDesigned for space critical applications, the ADR510 is a low
voltage (1.000 V), precision shunt-mode voltage reference in the
ultracompact (3 mm � 3 mm) SOT-23 package. The ADR510
features low temperature drift (70 ppm/�C), high accuracy
(�0.35%), and ultralow noise (4 �V p-p) performance.
The ADR510’s advanced design eliminates the need for an
external capacitor, yet it is stable with any capacitive load. The
minimum operating current increases from a scant 100 �A to a
maximum of 10 mA. This low operating current and ease of
use make the ADR510 ideally suited for hand-held battery-
powered applications.
A TRIM terminal is available on the ADR510 to provide adjust-
ment of the output voltage over �0.5% without affecting the
temperature coefficient of the device. This feature provides
users with the flexibility to trim out any system errors.
PIN CONFIGURATION
3-Lead SOT-23
ADR510Figure 1.Typical Operating Circuit
ADR510–SPECIFICATIONS
ELECTRICAL CHARACTERISTICSOUTPUT VOLTAGE CHANGE VS. IIN
NOTESThe forward diode voltage characteristic at –1 mA is typically 0.65 V.Measured without a load capacitor.
Specifications subject to change without notice.
(IIN = 100 �A to 10 mA @ TA = 25�C, unless otherwise noted.)
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
ADR510 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.
ABSOLUTE MAXIMUM RATINGS*Reverse Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 mA
Forward Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 mA
Storage Temperature Range
RT Package . . . . . . . . . . . . . . . . . . . . . . . .–65°C to +150°C
Operating Temperature Range . . . . . . . . . . . .–40°C to +85°C
Junction Temperature Range
RT Package . . . . . . . . . . . . . . . . . . . . . . . .–65°C to +150°C
Lead Temperature Range (Soldering, 60 Sec) . . . . . . . .300°C
*Absolute maximum ratings apply at 25°C, unless otherwise noted. Stresses abovethose 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.
NOTESPackage power dissipation = (TJ MAX – TA)/θJA.θJA is specified for worst-case conditions, i.e., θJA is specified for device soldered
in circuit board for surface-mount packages.
ORDERING GUIDEADR510ART-REEL7
TPC 1. Typical VOUT vs. Temperature
TPC 2. Turn-On Time
TPC 3. Turn-On Time with 1 µF Input Capacitor
TPC 4. Turn-Off Time
TPC 5. Turn-Off Time with 1 µF Input Capacitor
TPC 6. Output Response to 100 µA Input Current Change
ADR510
PARAMETER DEFINITIONS
Temperature CoefficientThis is the change of output voltage with respect to the 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
Thermal HysteresisThermal hysteresis is defined as the change of output voltage
after the device is cycled through the temperature from 25°C to
0°C to 70°C and back to 25°C. This is a typical value from a
sample of parts put through such a cycle.(2)
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
APPLICATIONS SECTIONThe ADR510 is a 1.0 V precision shunt voltage reference. It
is designed to operate without an external output capacitor
between the positive and negative terminals for stability. An exter-
nal capacitor can be used for additional filtering of the supply.
As with all shunt voltage references, an external bias resistor
(RBIAS) is required between the supply voltage and the ADR510
(see Figure 1). RBIAS sets the current that is required to pass
through the load (IL) and the ADR510 (IQ). The load and the
supply voltage can vary, thus RBIAS is chosen based onRBIAS must be small enough to supply the minimum IQ cur-
rent to the ADR510 even when the supply voltage is at its
minimum and the load current is at its maximum value.RBIAS also needs to be large enough so that IQ does not
exceed 10 mA when the supply voltage is at its maximum
and the load current is at its minimum.
Given these conditions, RBIAS is determined by the supply
voltage (VS), the load and operating current (IL and IQ) of the
ADR510, and the ADR510’s output voltage.(3)
TPC 7.Output Response to 100 µA Input Current
Change with 1 µF Capacitor
TPC 8.1Hz to 10Hz Noise
Adjustable Precision Voltage SourceThe ADR510, combined with a precision low input bias op amp
such as the AD8610, can be used to output a precise adjustable
voltage. Figure 2 illustrates the implementation of this application
using the ADR510.
The output of the op amp, VOUT, is determined by the gain of the
circuit, which is completely dependent on Resistors R2 and R1.(4)
An additional capacitor in parallel with R2 can be added to filter
out high frequency noise. The value of C2 is dependent on the
value of R2.
Figure 2.Adjustable Precision Voltage Source
Output Voltage TrimUsing a mechanical or digital potentiometer, the output voltage
of the ADR510 can be trimmed ±0.5%. The circuit in Figure 3
illustrates how the output voltage can be trimmed, using a 10kΩ
potentiometer. Note that trimming using other resistor values
may not produce an accurate output from the ADR510.
Figure 3.Output Voltage Trim
Using the ADR510 with Precision Data ConvertersThe compact ADR510 and its low minimum operating current
requirement make it ideal for use in battery-powered portable
instruments, such as the AD7533 CMOS multiplying DAC, that
use precision data converters.
Figure 4 shows the ADR510 serving as an external reference to
the AD7533, a CMOS multiplying DAC. Such a DAC requires
a negative voltage input in order to provide a positive output range.
In this application, the ADR510 is supplying a –1.0 V reference
to the REF input of the AD7533.
Figure 4.ADR510 as a Reference for a 10-Bit
CMOS DAC (AD7533)
Precise Negative Voltage ReferenceThe ADR510 is suitable for use in applications where a precise
negative voltage reference is desired, including the application
detailed in Figure 4.
Figures 5 shows the ADR510 configured to provide a –1.0V output.
Figure 5.Precise –1.0 V Reference Configuration
Since the ADR510 characteristics resemble those of a Zener
diode, the cathode shown in Figure 5 will be 1.0V higher with
respect to the anode (V+ with respect to V– on the ADR510
package). Since the cathode of the ADR510 is tied to ground,
the anode must be –1.0 V.
R1 in Figure 5 should be chosen so that 100 µA to 10 mA is
provided to properly bias the ADR510.(5)
The R1 resistor should be chosen so that power dissipation is at
a minimum. An ideal resistor value can be determined through
manipulation of Equation 5.
ADR510
OUTLINE DIMENSIONS
3-Lead Small Outline Transistor Package [SOT-23]
(RT-3)Dimensions shown in millimeters
