PIN CONFIGURATIONS
8-Pin TO-99
8-Pin DIP
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
Pin Programmable
Precision Voltage Reference
AD584*
FEATURES
Four Programmable Output Voltages:
10.000 V, 7.500 V, 5.000 V, 2.500 V
Laser-Trimmed to High Accuracies
No External Components Required
Trimmed Temperature Coefficient:
5 ppm/ C max, 0 C to +70 C (AD584L)
15 ppm/ C max, 55 C to +125
C (AD584T)
Zero Output Strobe Terminal Provided
Two Terminal Negative Reference
Capability (5 V & Above)
Output Sources or Sinks Current
Low Quiescent Current: 1.0 mA max
10 mA Current Output Capability
MIL-STD-883 Compliant Versions Available
GENERAL DESCRIPTION
The AD584 is an eight-terminal precision voltage reference of-
fering pin-programmable selection of four popular output volt-
ages: 10.000 V, 7.500 V, 5.000 V and 2.500 V. 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 and 30 volts.
Laser Wafer Trimming (LWT) is used to adjust the pin-pro-
grammable 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 100
A. In the "on" state the total supply
current is typically 750
A 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 refer-
ence. The device is also ideal for all types of A/D converters of
up to 14-bit accuracy, either successive approximation or inte-
grating 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-pin plastic DIP.
*Protected by U.S. Patent No. 3,887,863; RE 30,586
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
PRODUCT HIGHLIGHTS
1. The flexibility of the AD584 eliminates the need to design-
in and inventory several different voltage references. Fur-
thermore one AD584 can serve as several references
simultaneously when buffered properly.
2. Laser trimming of both initial accuracy and temperature co-
efficient results in very low errors over temperature without
the use of external components. The AD584LH has a maxi-
mum deviation from 10.000 volts of
7.25 mV from 0
C to
+70
C.
3. The AD584 can be operated in a two-terminal "Zener"
mode at 5 volts output and above. By connecting the input
and the output, the AD584 can be used in this "Zener" con-
figuration as a negative reference.
4. The output of the AD584 is configured to sink or source
currents. This means that small reverse currents can be tol-
erated in circuits using the AD584 without damage to the
reference and without disturbing the output voltage (10 V,
7.5 V and 5 V outputs).
5. 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.
AD584SPECIFICATIONS
Model
AD584J
AD584K
AD584L
Min
Typ
Max
Min
Typ
Max
Min
Typ
Max
Units
OUTPUT VOLTAGE TOLERANCE
Maximum Error
1
for Nominal
Outputs of:
10.000 V
30
10
5
mV
7.500 V
20
8
4
mV
5.000 V
15
6
3
mV
2.500 V
7.5
3.5
2.5
mV
OUTPUT VOLTAGE CHANGE
Maximum Deviation from +25
C
Value, T
MIN
to T
MAX
2
10.000 V, 7.500 V, 5.000 V Outputs
30
15
5
ppm/
C
2.500 V Output
30
15
10
ppm/
C
Differential Temperature
Coefficients Between Outputs
5
3
3
ppm/
C
QUIESCENT CURRENT
0.75
1.0
0.75
1.0
0.75
1.0
mA
Temperature Variation
1.5
1.5
1.5
A/
C
TURN-ON SETTLING TIME TO 0.1%
200
200
200
s
NOISE
(0.1 Hz to 10 Hz)
50
50
50
V p-p
LONG-TERM STABILITY
25
25
25
ppm/1000 Hrs
SHORT-CIRCUIT CURRENT
30
30
30
mA
LINE REGULATION (No Load)
15 V
V
IN
30 V
0.002
0.002
0.002
%/V
(V
OUT
+2.5 V)
V
IN
15 V
0.005
0.005
0.005
%/V
LOAD REGULATION
0
I
OUT
5 mA, All Outputs
20
50
20
50
20
50
ppm/mA
OUTPUT CURRENT
V
IN
V
OUT
+2.5 V
Source @ +25
C
10
10
10
mA
Source T
MIN
to T
MAX
5
5
5
mA
Sink T
MIN
to T
MAX
5
5
5
mA
TEMPERATURE RANGE
Operating
0
+70
0
+70
0
+70
C
Storage
65
+175
65
+175
65
+175
C
PACKAGE OPTION
3
TO-99 (H-08A)
AD584JH
AD584KH
AD584LH
Plastic (N-8)
AD584JN
AD584KN
REV. A
2
METALIZATION PHOTOGRAPH
Dimensions shown in inches and (mm).
NOTES
1
At Pin 1.
2
Calculated as average over the operating temperature range.
3
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.
ABSOLUTE MAXIMUM RATINGS
Input Voltage V
IN
to Ground . . . . . . . . . . . . . . . . . . . . . . . 40 V
Power Dissipation
@ +25
C . . . . . . . . . . . . . . . . . . . . 600 mW
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
(@ V
IN
= +15 V and 25 C)
AD584
Model
AD584S
AD584T
Min
Typ
Max
Min
Typ
Max
Units
OUTPUT VOLTAGE TOLERANCE
Maximum Error
1
for Nominal
Outputs of:
10.000 V
30
10
mV
7.500 V
20
8
mV
5.000 V
15
6
mV
2.500 V
7.5
3.5
mV
OUTPUT VOLTAGE CHANGE
Maximum Deviation from +25
C
Value, T
MIN
to T
MAX
2
10.000 V, 7.500 V, 5.000 V Outputs
30
15
ppm/
C
2.500 V Output
30
20
ppm/
C
Differential Temperature
Coefficients Between Outputs
5
3
ppm/
C
QUIESCENT CURRENT
0.75
1.0
0.75
1.0
mA
Temperature Variation
1.5
1.5
A/
C
TURN-ON SETTLING TIME TO 0.1%
200
200
s
NOISE
(0.1 Hz to 10 Hz)
50
50
V p-p
LONG-TERM STABILITY
25
25
ppm/1000 Hrs
SHORT-CIRCUIT CURRENT
30
30
mA
LINE REGULATION (No Load)
15 V
V
IN
30 V
0.002
0.002
%/V
(V
OUT
+2.5 V)
V
IN
15 V
0.005
0.005
%/V
LOAD REGULATION
0
I
OUT
5 mA, All Outputs
20
50
20
50
ppm/mA
OUTPUT CURRENT
V
IN
V
OUT
+2.5 V
Source @ +25
C
10
10
mA
Source T
MIN
to T
MAX
5
5
mA
Sink T
MIN
to T
MAX
5
5
mA
TEMPERATURE RANGE
Operating
55
+125
55
+125
C
Storage
65
+175
65
+175
C
PACKAGE OPTION
TO-99 (H-08A)
AD584SH
AD584TH
NOTES
1
At Pin 1.
2
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.
REV. A
3
AD584
REV. A
4
range will be about 20 V 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 toler-
ance in the internal resistor ladder must be accounted for.
Alternatively, the output voltage can be raised by loading the
2.5 V tap with R3 alone. The output voltage can be lowered by
connecting 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 T.C. less than
60 ppm/
C. If both R3 and R4 are used, these resistors should
have matched temperature 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 5.0 V, 7.5 V or 10 V and ad-
justed by means of R1 over a range of about
200 mV. To trim
the 2.5 V output option, R2 (Figure 2) can be reconnected to
the bandgap reference (Pin 6). In this configuration, the adjust-
ment should be limited to
100 mV in order to avoid affecting
the performance of the AD584.
Figure 2. Output Trimming
Figure 3. Schematic Diagram
APPLYING THE AD584
With 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:
Output
Voltage
Pin Programming
7.5 V
Join the 2.5 V and 5.0 V pins (2) and (3)
5.0 V
Connect the 5.0 V pin (2) to the output pin (1).
2.5 V
Connect the 2.5 V pin (3) to the output pin (1).
The options shown above are available without the use of any
additional components. Multiple outputs using only one
AD584, are also possible by simply buffering each voltage pro-
gramming pin with a unity-gain noninverting op amp.
Figure 1. Variable Output Options
The AD584 can also be programmed over a wide range of out-
put voltages, including voltages greater than 10 V, by the ad-
dition of one or more external resistors. Figure 1 illustrates the
general adjustment 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 volt bandgap reference (see Fig-
ure 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
10.24 V, 5.12 V, 2.56 V or 6.3 V easy to obtain. The most
general adjustment (which gives the greatest range and poorest
resolution) uses R1 and R2 alone (see Figure 1). As R1 is ad-
justed to its upper limit the 2.5 V Pin 3 will be connected to the
output, which will reduce to 2.5 V. 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 6 k
, the upper limit of the output
AD584
REV. A
5
PERFORMANCE OVER TEMPERATURE
Each AD584 is tested at three temperatures over the 55
C to
+125
C range to ensure that each device falls within the Maxi-
mum Error Band (see Figure 4) specified for a particular grade
(i.e., S and T grades); three-point measurement guarantees per-
formance within the error band from 0
C to +70
C (i.e., J, K,
or L grades). The error band guaranteed for the AD584 is the
maximum deviation from the initial value at +25
C. Thus, given
the grade of the AD584, the designer can easily determine the
maximum total error from initial tolerance plus temperature
variation. For example, for the AD584T, the initial tolerance is
l0 mV and the error band is
15 mV. Hence, the unit is guar-
anteed to be 10.000 volts
25 mV from 55
C to +125
C.
Figure 4. Typical Temperature Characteristic
OUTPUT CURRENT CHARACTERISTICS
The AD584 has the capability to either source or sink current
and provide good load regulation in either direction, although it
has better characteristics in the source mode (positive current
into the load). The circuit is protected for shorts to either posi-
tive supply or ground. The output voltage vs. output current
characteristics of the device is shown in Figure 5. Source current
is displayed as negative current in the figure; sink current is
positive. Note that the short circuit current (i.e., zero volts out-
put) is about 28 mA; when shorted to +15 volts, the sink cur-
rent goes to about 20 mA.
Figure 5. AD584 Output Voltage vs. Sink and Source
Current
DYNAMIC PERFORMANCE
Many low power instrument manufacturers are becoming in-
creasingly concerned with the turn-on characteristics of the
components being used in their systems. Fast turn-on compo-
nents often enable the end user to keep power off when not
needed, and yet respond quickly when the power is turned on
for operation. Figure 6 displays the turn-on characteristic of the
AD584. Figure 6a is generated from cold-start operation and
represents the true turn-on waveform after an extended period
with the supplies off. The figure shows both the coarse and fine
transient characteristics of the device; the total settling time to
within
10 millivolt is about 180
s, and there is no long ther-
mal tail appearing after the point.
Figure 6. Output Settling Characteristic
NOISE FILTERING
The bandwidth of the output amplifier in the AD584 can be re-
duced to filter the output noise. A capacitor ranging between
0.01
F and 0.1
F connected between the Cap and V
BG
termi-
nals will further reduce the wideband and feedthrough noise in
the output of the AD584, as shown in Figure 8. However, this
will tend to increase the turn-on settling time of the device so
ample warm-up time should be allowed.
Figure 7. Additional Noise Filtering with an External
Capacitor
Figure 8. Spectral Noise Density and Total rms Noise vs.
Frequency
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