AD584 ,Pin Programmable Precision Voltage ReferenceGENERAL DESCRIPTIONThe AD584 is an eight-terminal precision voltage reference offer-ing pin-program ..
AD584JH ,Pin Programmable Precision Voltage Referencespecifications.REV. AInformation furnished by Analog Devices is believed to be accurate andreliable ..
AD584JH. ,Pin Programmable Precision Voltage ReferenceSpecifications shown in boldface are tested on all production units at final electricaltest. Result ..
AD584JN ,Pin Programmable Precision Voltage ReferenceSpecifications subject to change without notice.
AD584KH ,Pin Programmable Precision Voltage ReferencePin ProgrammableaPrecision Voltage ReferenceAD584*PIN CONFIGURATIONS
AD584KN ,Pin Programmable Precision Voltage Referencespecifications are guaranteed, although only those shown in boldface aretested on all production un ..
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AD584
Pin Programmable Precision Voltage Reference
REV.B
Pin Programmable
Precision Voltage Reference
PIN CONFIGURATIONS
8-Lead TO-99
8-Lead DIP
FEATURES
Four Programmable Output Voltages:
10.000V, 7.500V, 5.000V, 2.500V
Laser-Trimmed to High Accuracies
No External Components Required
Trimmed Temperature Coefficient:ppm/�C Max, 0�C to 70�C (AD584L)ppm/�C Max, –55�C to +125�C (AD584T)
Zero Output Strobe Terminal Provided
Two Terminal Negative Reference
Capability (5V and above)
Output Sources or Sinks Current
Low Quiescent Current: 1.0mA MaxmA Current Output Capability
MIL-STD-883 Compliant Versions Available
GENERAL DESCRIPTIONThe AD584 is an eight-terminal precision voltage reference offer-
ing pin-programmable selection of four popular output voltages:
10.000V, 7.500V, 5.000V and 2.500V. Other output voltages,
above, below or between the four standard outputs, are available
by the addition of external resistors. Input voltage may vary between
4.5 V and 30 V.
Laser Wafer Trimming (LWT) is used to adjust the pin-
programmable output levels and temperature coefficients,
resulting in the most flexible high precision voltage reference
available in monolithic form.
In addition to the programmable output voltages, the AD584 offers
a unique strobe terminal which permits the device to be turned
on or off. When the AD584 is used as a power supply reference,
the supply can be switched off with a single, low-power signal.
In the “off” state the current drain by the AD584 is reduced to
about 100µA. In the “on” state the total supply current is typi-
cally 750µA including the output buffer amplifier.
The AD584 is recommended for use as a reference for 8-, 10-,
or 12-bit D/A converters which require an external precision
reference. The device is also ideal for all types of A/D convert-
ers of up to 14-bit accuracy, either successive approximation or
integrating designs, and in general can offer better performance
than that provided by standard self-contained references.
The AD584J, K, and L are specified for operation from 0°C to
70°C; the AD584S and T are specified for the –55°C to +125°C
range. All grades are packaged in a hermetically sealed eight-
terminal TO-99 metal can; the AD584 J and K are also available
in an 8-lead plastic DIP.
PRODUCT HIGHLIGHTSThe flexibility of the AD584 eliminates the need to design-in
and inventory several different voltage references. Further
more one AD584 can serve as several references simultaneously
when buffered properly.Laser trimming of both initial accuracy and temperature coeffi-
cient results in very low errors over temperature without the
use of external components. The AD584LH has a maximum
deviation from 10.000 V of ±7.25mV from 0°C to 70°C.The AD584 can be operated in a two-terminal “Zener” mode
at 5 V output and above. By connecting the input and the
output, the AD584 can be used in this “Zener” configuration
as a negative reference.The output of the AD584 is configured to sink or source
currents. This means that small reverse currents can be toler-
ated in circuits using the AD584 without damage to the refer-
ence and without disturbing the output voltage (10V, 7.5V,
and 5V outputs).The AD584 is available in versions compliant with MIL-STD-
883. Refer to the Analog Devices Military Products Databook
or current AD584/883B data sheet for detailed specifications.
*. Patent No. 3,887,863; RE 30,586.
AD584–SPECIFICATIONS(@ VIN = 15 V and 25�C unless otherwise noted.)OUTPUT VOLTAGE TOLERANCE
OUTPUT VOLTAGE CHANGE
QUIESCENT CURRENT
LOAD REGULATION
TEMPERATURE RANGE
PACKAGE OPTION
NOTESAt Pin 1.Calculated as average over the operating temperature range.H = Hermetic Metal Can; N = Plastic DIP.
Specifications subject to change without notice.
Specifications shown in boldface are tested on all production units at final electrical
test. Results from those tests are used to calculate outgoing quality levels. All min
and max specifications are guaranteed, although only those shown in boldface are
tested on all production units.
AD584OUTPUT VOLTAGE CHANGE
QUIESCENT CURRENT
LOAD REGULATION
NOTESAt Pin 1.Calculated as average over the operating temperature range.
Specifications subject to change without notice.
Specifications shown in boldface are tested on all production units at final electrical
test. Results from those tests are used to calculate outgoing quality levels. All min
and max specifications are guaranteed, although only those shown in boldface are
tested on all production units.
AD584
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 AD584 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 RATINGSInput Voltage VIN to Ground . . . . . . . . . . . . . . . . . . . . . .40V
PowerDissipation @ 25°C . . . . . . . . . . . . . . . . . . . . . 600mW
Operating Junction Temperature Range . . .–55°C to +125°C
Lead Temperature (Soldering 10 sec) . . . . . . . . . . . . . .300°C
Thermal Resistance
Junction-to-Ambient (H-08A) . . . . . . . . . . . . . . .150°C/W
METALIZATION PHOTOGRAPHDimensions shown in inches and (mm).
ORDERING GUIDE
APPLYING THE AD584With power applied to Pins 8 and 4 and all other pins open, the
AD584 will produce a buffered nominal 10.0 V output between
Pins 1 and 4 (see Figure 1). The stabilized output voltage may be
reduced to 7.5 V, 5.0 V, or 2.5 V by connecting the program-
ming pins as follows:
The options shown above are available without the use of any addi-
tional components. Multiple outputs using only one AD584, are
also possible by simply buffering each voltage programming pin
with a unity-gain noninverting op amp.
Figure 1.Variable Output Options
The AD584 can also be programmed over a wide range of output
voltages, including voltages greater than 10V, by the addition of
one or more external resistors. Figure 1 illustrates the general adjust-
ment procedure, with approximate values given for the internal
resistors of the AD584. The AD584 may be modeled as an op amp
with a noninverting feedback connection, driven by a high stability
1.215 V bandgap reference (see Figure 3 for schematic).
When the feedback ratio is adjusted with external resistors, the
output amplifier can be made to multiply the reference voltage by
almost any convenient amount, making popular outputs of 10.24V,
5.12V, 2.56V, or 6.3V easy to obtain. The most general adjust-
ment (which gives the greatest range and poorest resolution) uses
R1 and R2 alone (see Figure 1). As R1 is adjusted to its upper limit
the 2.5V Pin 3 will be connected to the output, which will reduce
to 2.5V. As R1 is adjusted to its lower limit, the output voltage
will rise to a value limited by R2. For example, if R2 is about 6kΩ,
the upper limit of the output range will be about 20V even for large
values of R1. R2 should not be omitted; its value should be chosen
to limit the output to a value which can be tolerated by the load
circuits. If R2 is zero, adjusting R1 to its lower limit will result in a
loss of control over the output voltage. If precision voltages are
required to be set at levels other than the standard outputs, the
20% absolute tolerance in the internal resistor ladder must be
accounted for.
Alternatively, the output voltage can be raised by loading the 2.5V
tap with R3 alone. The output voltage can be lowered by connect-
ing R4 alone. Either of these resistors can be a fixed resistor selected
by test or an adjustable resistor. In all cases the resistors should
have a low temperature coefficient to match the AD584 internal
resistors, which have a negative TC less than 60ppm/°C. If both
R3 and R4 are used, these resistors should have matched tempera-
ture coefficients.
When only small adjustments or trims are required, the circuit of
Figure 2 offers better resolution over a limited trim range. The
circuit can be programmed to 5.0V, 7.5V, or 10V and adjusted
by means of R1 over a range of about ±200mV. To trim the 2.5V
output option, R2 (Figure 2) can be reconnected to the bandgap
reference (Pin 6). In this configuration, the adjustment should be
limited to ±100mV in order to avoid affecting the performance of
the AD584.
Figure 2.Output Trimming
Figure 3.Schematic Diagram
