5962-01-175-0301 [ADI]

5962-01-175-0301;
5962-01-175-0301
型号: 5962-01-175-0301
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5962-01-175-0301

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Pin Programmable  
Precision Voltage Reference  
a
AD584*  
FEATURES  
PIN CONFIGURATIONS  
8-Lead TO-99  
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 and above)  
TAB  
8
1
CAP  
7
10.0V  
2
V+  
AD584  
TOP VIEW  
6
V
5.0V  
BG  
(Not to Scale)  
3
5
STROBE  
2.5V  
4
COMMON  
Output Sources or Sinks Current  
Low Quiescent Current: 1.0 mA Max  
10 mA Current Output Capability  
MIL-STD-883 Compliant Versions Available  
8-Lead DIP  
1
8
+V  
10.0V  
5.0V  
AD584  
2
3
4
7
CAP  
TOP VIEW  
(Not to Scale)  
6
2.5V  
V
BG  
5
COMMON  
STROBE  
GENERAL DESCRIPTION  
The AD584 is an eight-terminal precision voltage reference offer-  
ing pin-programmable selection of four popular output voltages:  
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 V and 30 V.  
PRODUCT HIGHLIGHTS  
1. The 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 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.  
2. 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 7.25 mV from 0°C to 70°C.  
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 µA. In the “on” state the total supply current is typi-  
cally 750 µA including the output buffer amplifier.  
3. 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.  
4. 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 (10 V, 7.5 V,  
and 5 V outputs).  
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.  
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.  
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.  
*Protected by U.S. Patent No. 3,887,863; RE 30,586.  
REV. B  
Information furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assumed by Analog Devices for its  
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat  
may result from its use. No license is granted by implication or otherwise  
under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329-4700  
Fax: 781/326-8703  
www.analog.com  
© Analog Devices, Inc., 2001  
(@ V = 15 V and 25؇C unless otherwise noted.  
)
AD584–SPECIFICATIONS  
IN  
Model  
AD584J  
AD584K  
Typ Max  
AD584L  
Min Typ Max  
Min  
Min Typ Max  
Unit  
OUTPUT VOLTAGE TOLERANCE  
Maximum Error1 for Nominal  
Outputs of:  
10.000 V  
؎30  
؎20  
؎15  
؎7.5  
؎10  
؎8  
؎6  
؎5  
؎4  
؎3  
؎2.5  
mV  
mV  
mV  
mV  
7.500 V  
5.000 V  
2.500 V  
؎3.5  
OUTPUT VOLTAGE CHANGE  
Maximum Deviation from 25°C  
2
Value, TMIN to TMAX  
10.000 V, 7.500 V, 5.000 V Outputs  
2.500 V Output  
Differential Temperature  
30  
30  
15  
15  
5
10  
ppm/°C  
ppm/°C  
Coefficients Between Outputs  
5
3
3
ppm/°C  
QUIESCENT CURRENT  
Temperature Variation  
0.75 1.0  
1.5  
0.75 1.0  
1.5  
0.75 1.0  
1.5  
mA  
µA/°C  
TURN-ON SETTLING TIME TO 0.1%  
200  
200  
200  
µs  
NOISE  
(0.1 Hz to 10 Hz)  
50  
25  
30  
50  
25  
30  
50  
25  
30  
µV p-p  
LONG-TERM STABILITY  
ppm/1000 Hrs  
mA  
SHORT-CIRCUIT CURRENT  
LINE REGULATION (No Load)  
15 V VIN 30 V  
(VOUT 2.5 V) VIN 15 V  
0.002  
0.005  
0.002  
0.005  
0.002 %/V  
0.005 %/V  
LOAD REGULATION  
0 IOUT 5 mA, All Outputs  
20  
50  
20  
50  
20  
50  
ppm/mA  
OUTPUT CURRENT  
VIN VOUT 2.5 V  
Source @ 25°C  
10  
5
5
10  
5
5
10  
5
5
mA  
mA  
mA  
Source TMIN to TMAX  
Sink TMIN to TMAX  
TEMPERATURE RANGE  
Operating  
Storage  
0
–65  
70  
+175  
0
–65  
70  
+175  
0
–65  
70  
°C  
+175 °C  
PACKAGE OPTION3  
TO-99 (H-08A)  
Plastic (N-8)  
AD584JH  
AD584JN  
AD584KH  
AD584KN  
AD584LH  
NOTES  
1At Pin 1.  
2Calculated as average over the operating temperature range.  
3H = 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.  
–2–  
REV. B  
AD584  
Model  
AD584S  
Typ Max  
AD584T  
Min Typ  
Min  
Max  
Unit  
OUTPUT VOLTAGE TOLERANCE  
Maximum Error1 for Nominal  
Outputs of:  
10.000 V  
؎30  
؎20  
؎15  
؎7.5  
؎10  
؎8  
6
mV  
mV  
mV  
mV  
7.500 V  
5.000 V  
2.500 V  
؎3.5  
OUTPUT VOLTAGE CHANGE  
Maximum Deviation from 25°C  
2
Value, TMIN to TMAX  
10.000 V, 7.500 V, 5.000 V Outputs  
2.500 V Output  
Differential Temperature  
30  
30  
15  
20  
ppm/°C  
ppm/°C  
Coefficients Between Outputs  
5
3
ppm/°C  
QUIESCENT CURRENT  
Temperature Variation  
0.75 1.0  
1.5  
0.75  
1.5  
1.0  
mA  
µA/°C  
TURN-ON SETTLING TIME TO 0.1%  
200  
200  
µs  
NOISE  
(0.1 Hz to 10 Hz)  
50  
25  
30  
50  
25  
30  
µV p-p  
LONG-TERM STABILITY  
ppm/1000 Hrs  
mA  
SHORT-CIRCUIT CURRENT  
LINE REGULATION (No Load)  
15 V VIN 30 V  
(VOUT 2.5 V) VIN 15 V  
0.002  
0.005  
0.002  
0.005  
%/V  
%/V  
LOAD REGULATION  
0 IOUT 5 mA, All Outputs  
20  
50  
20  
50  
ppm/mA  
OUTPUT CURRENT  
VIN VOUT 2.5 V  
Source @ 25°C  
10  
5
5
10  
5
5
mA  
mA  
mA  
Source TMIN to TMAX  
Sink TMIN to TMAX  
TEMPERATURE RANGE  
Operating  
Storage  
–55  
–65  
+125  
+175  
–55  
–65  
+125  
+175  
°C  
°C  
PACKAGE OPTION  
TO-99 (H-08A)  
AD584SH  
AD584TH  
NOTES  
1At Pin 1.  
2Calculated 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.  
–3–  
REV. B  
AD584  
ABSOLUTE MAXIMUM RATINGS  
METALIZATION PHOTOGRAPH  
Dimensions shown in inches and (mm).  
Input Voltage VIN 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  
ORDERING GUIDE  
Temperature  
Ouput  
Voltage  
VO  
No. of  
Parts per Range  
Package  
Temperature  
Initial Accuracy  
Coefficient  
Package  
Description  
Package  
Option  
Model  
mV  
%
ppm/؇C  
؇C  
AD584L  
AD584K  
AD584T  
AD584S  
AD584J  
2.5  
2.5  
2.5  
2.5  
2.5  
2.5  
0.10  
0.14  
0.14  
0.30  
0.30  
10  
15  
20  
30  
30  
TO-99  
TO-99, Plastic  
TO-99  
TO-99  
TO-99, Plastic  
H-8  
H-8, N-8  
H-8  
H-8  
H-8, N-8  
100  
100, 48  
100  
100  
100, 48  
0 to 70  
0 to 70  
–55 to +125  
–55 to +125  
0 to 70  
3.5  
3.5  
7.5  
7.5  
AD584L  
AD584K  
AD584T  
AD584S  
AD584J  
5
5
5
5
5
3
6
6
15  
15  
0.06  
0.12  
0.12  
0.30  
0.30  
5
TO-99  
TO-99, Plastic  
TO-99  
TO-99  
TO-99, Plastic  
H-8  
H-8, N-8  
H-8  
H-8  
H-8, N-8  
100  
100, 48  
100  
48  
100, 48  
0 to 70  
0 to 70  
–55 to +125  
–55 to +125  
0 to 70  
15  
15  
30  
30  
AD584L  
AD584K  
AD584T  
AD584S  
AD584J  
7.50  
7.50  
7.50  
7.50  
7.50  
4
8
8
20  
20  
0.05  
0.11  
0.11  
0.27  
0.27  
5
TO-99  
TO-99, Plastic  
TO-99  
TO-99  
H-8  
H-8, N-8  
H-8  
H-8  
100  
100, 48  
100  
100  
0 to 70  
0 to 70  
–55 to +125  
–55 to +125  
0 to 70  
15  
15  
30  
30  
TO-99, Plastic  
H-8, N-8  
100, 48  
AD584L  
AD584K  
AD584T  
AD584S  
AD584J  
10.00  
10.00  
10.00  
10.00  
10.00  
5
0.05  
0.10  
0.10  
0.30  
0.30  
5
TO-99  
TO-99, Plastic  
TO-99  
TO-99  
TO-99, Plastic  
H-8  
H-8, N-8  
H-8  
H-8  
H-8, N-8  
100  
100, 48  
100  
100  
100, 48  
0 to 70  
0 to 70  
–55 to +125  
–55 to +125  
0 to 70  
10  
10  
30  
30  
15  
15  
30  
30  
CAUTION  
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V 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.  
WARNING!  
ESD SENSITIVE DEVICE  
–4–  
REV. B  
AD584  
APPLYING THE AD584  
the upper limit of the output 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 tolerance in the internal resistor ladder must be  
accounted for.  
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  
Alternatively, the output voltage can be raised by loading the 2.5 V  
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 60 ppm/°C. If both  
R3 and R4 are used, these resistors should have matched tempera-  
ture coefficients.  
7.5 V  
5.0 V  
2.5 V  
Join the 2.5 V and 5.0 V pins (2) and (3).  
Connect the 5.0 V pin (2) to the output pin (1).  
Connect the 2.5 V pin (3) to the output pin (1).  
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.  
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 adjusted  
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 adjustment should be  
limited to 100 mV in order to avoid affecting the performance of  
the AD584.  
Figure 2. Output Trimming  
Figure 1. Variable Output Options  
The AD584 can also be programmed over a wide range of output  
voltages, including voltages greater than 10 V, 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 10.24 V,  
5.12 V, 2.56 V, or 6.3 V 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 2.5 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,  
Figure 3. Schematic Diagram  
REV. B  
–5–  
AD584  
PERFORMANCE OVER TEMPERATURE  
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 wave-  
form 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 mV is about 180 µs, and  
there is no long thermal tail appearing after the point.  
Each AD584 is tested at three temperatures over the –55°C to  
+125°C range to ensure that each device falls within the Maximum  
Error Band (see Figure 4) specified for a particular grade (i.e.,  
S and T grades); three-point measurement guarantees performance  
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 devia-  
tion 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 10 mV and the error band  
is 15 mV. Hence, the unit is guaranteed to be 10.000 V 25 mV  
from –55°C to +125°C.  
Figure 6. Output Settling Characteristic  
NOISE FILTERING  
The bandwidth of the output amplifier in the AD584 can be reduced  
to filter the output noise. A capacitor ranging between 0.01 µF and  
0.1 µF connected between the Cap and VBG terminals 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 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 positive supply  
or ground. The output voltage versus output current character-  
istics of the device is shown in Figure 5. Source current is  
displayed as negative current in the figure; sink current is posi-  
tive. Note that the short circuit current (i.e., zero volts output)  
is about 28 mA; when shorted to 15 V, the sink current goes to  
about 20 mA.  
Figure 7. Additional Noise Filtering with an External  
Capacitor  
Figure 5. AD584 Output Voltage vs. Sink and Source  
Current  
DYNAMIC PERFORMANCE  
Many low power instrument manufacturers are becoming increas-  
ingly concerned with the turn-on characteristics of the components  
being used in their systems. Fast turn-on components often enable  
Figure 8. Spectral Noise Density and Total rms Noise vs.  
Frequency  
–6–  
REV. B  
AD584  
USING THE STROBE TERMINAL  
The AD584 can also use an NPN or Darlington NPN transistor  
to boost its output current. Simply connect the 10 V output termi-  
nal of the AD584 to the base of the NPN booster and take the  
output from the booster emitter as shown in Figure 11. The 5.0 V  
or 2.5 V pin must connect to the actual output in this configu-  
ration. Variable or adjustable outputs (as shown in Figures 1  
and 2) may be combined with 5.0 V connection to obtain outputs  
above 5.0 V.  
The AD584 has a strobe input which can be used to zero the output.  
This unique feature permits a variety of new applications in signal  
and power conditioning circuits.  
Figure 9 illustrates the strobe connection. A simple NPN switch  
can be used to translate a TTL logic signal into a strobe of the  
output. The AD584 operates normally when there is no current  
drawn from Pin 5. Bringing this terminal low, to less than 200 mV,  
will allow the output voltage to go to zero. In this mode the AD584  
should not be required to source or sink current (unless a 0.7 V  
residual output is permissible). If the AD584 is required to sink  
a transient current while strobed off, the strobe terminal input cur-  
rent should be limited by a 100 resistor as shown in Figure 9.  
THE AD584 AS A CURRENT LIMITER  
The AD584 represents an alternative to current limiter diodes which  
require factory selection to achieve a desired current. Use of current  
limiting diodes often results in temperature coefficients of 1%/°C.  
Use of the AD584 in this mode is not limited to a set current limit;  
it can be programmed from 0.75 mA to 5 mA with the insertion  
of a single external resistor (see Figure 12). Of course, the mini-  
mum voltage required to drive the connection is 5 V.  
The strobe terminal will tolerate up to 5 µA leakage and its driver  
should be capable of sinking 500 µA continuous. A low leakage  
open collector gate can be used to drive the strobe terminal  
directly, provided the gate can withstand the AD584 output  
voltage plus 1 V.  
Figure 9. Use of the Strobe Terminal  
Figure 11. NPN Output Current Booster  
PRECISION HIGH CURRENT SUPPLY  
The AD584 can be easily connected to a power PNP or power  
Darlington PNP device to provide much greater output current  
capability. The circuit shown in Figure 10 delivers a precision 10 V  
output with up to 4 amperes supplied to the load. The 0.1 µF  
capacitor is required only if the load has a significant capacitive  
component. If the load is purely resistive, improved high frequency  
supply rejection results from removing the capacitor.  
Figure 12. A Two-Component Precision Current Limiter  
NEGATIVE REFERENCE VOLTAGES FROM AN AD584  
The AD584 can also be used in a two-terminal “Zener” mode  
to provide a precision –10 V, –7.5 V, or –5.0 V reference. As  
shown in Figure 13, the VIN and VOUT terminals are connected  
together to the positive supply (in this case, ground). The AD584  
common pin is connected through a resistor to the negative supply.  
The output is now taken from the common pin instead of VOUT  
.
With 1 mA flowing through the AD584 in this mode, a typical  
unit will show a 2 mV increase in output level over that produced  
in the three-terminal mode. Note also that the effective output  
impedance in this connection increases from 0.2 typical to 2 .  
It is essential to arrange the output load and the supply resistor,  
RS, so that the net current through the AD584 is always between  
1 mA and 5 mA (between 2 mA and 5 mA for operation beyond  
85°C). The temperature characteristics and long-term stability of  
the device will be essentially the same as that of a unit used in the  
standard three-terminal mode.  
Figure 10. High Current Precision Supply  
REV. B  
–7–  
AD584  
The AD584 will normally be used in the –10 V mode with the  
AD7574 to give a 0 V to +10 V ADC range. This is shown in  
Figure 16. Bipolar output applications and other operating details  
can be found in the data sheets for the CMOS products.  
Figure 13. Two-Terminal –5 V Reference  
The AD584 can also be used in a two-terminal mode to develop  
a positive reference. VIN and VOUT are tied together and to the  
positive supply through an appropriate supply resistor. The perfor-  
mance characteristics will be similar to those of the negative  
two-terminal connection. The only advantage of this connection  
over the standard three-terminal connection is that a lower primary  
supply can be used, as low as 0.5 V above the desired output  
voltage. This type of operation will require considerable attention  
to load and primary supply regulation to be sure the AD584 always  
remains within its regulating range of 1 mA to 5 mA (2 mA to 5 mA  
for operation beyond 85°C).  
Figure 14. Low Power 10-Bit CMOS DAC Application  
PRECISION D/A CONVERTER REFERENCE  
The AD562, like many D/A converters, is designed to operate with  
a 10 V reference element (Figure 15). In the AD562, this 10 V  
reference voltage is converted into a reference current of approxi-  
mately 0.5 mA via the internal 19.95 kresistor (in series with  
the external 100 trimmer). The gain temperature coefficient of  
the AD562 is primarily governed by the temperature tracking of  
the 19.95 kresistor and the 5 k/10 kspan resistors; this  
gain TC is guaranteed to 3 ppm/°C. Thus, using the AD584L  
(at 5 ppm/°C) as the 10 V reference guarantees a maximum  
full-scale temperature coefficient of 8 ppm/°C over the commer-  
cial range. The 10 V reference also supplies the normal 1 mA  
10 V REFERENCE WITH MULTIPLYING CMOS D/A OR  
A/D CONVERTERS  
The AD584 is ideal for application with the entire AD7520 series  
of 10- and 12-bit multiplying CMOS D/A converters, especially  
for low power applications. It is equally suitable for the AD7574  
8-bit A/D converter. In the standard hook-up as shown in Figure 14,  
the standard output voltages are inverted by the amplifier/DAC  
configuration to produce converted voltage ranges. For example, a  
+10 V reference produces a 0 V to –10 V range. If an AD308 ampli-  
fier is used, total quiescent supply current will typically be 2 mA.  
Figure 15. Precision 12-Bit D/A Converter  
–8–  
REV. B  
AD584  
bipolar offset current through the 9.95 kbipolar offset resistor.  
The bipolar offset TC thus depends only on the TC matching  
of the bipolar offset resistor to the input reference resistor and is  
guaranteed to 3 ppm/°C. Figure 17 demonstrates the flexibility  
of the AD584 applied to another popular D/A configuration.  
Figure 17. Current Output 8-Bit D/A  
Figure 16. AD584 as Negative 10 V Reference for CMOS  
ADC  
REV. B  
–9–  
AD584  
OUTLINE DIMENSIONS  
Dimensions shown in inches and (mm).  
TO-99 Package  
(H-8)  
0.185 (4.70)  
0.165 (4.19)  
0.5 (12.70)  
MIN  
5
1
4
6
8
0.2  
(5.1)  
TYP  
0.335 (8.50)  
0.305 (7.75)  
0.370 (9.40)  
0.335 (8.50)  
3
7
0.045 (1.1)  
0.020 (0.51)  
2
0.04 (1.0) MAX  
45°  
EQUALLY  
SPACED  
8 LEADS  
0.019 (0.48)  
0.016 (0.41)  
0.034 (0.86)  
0.027 (0.69)  
INSULATION  
0.05 (1.27) MAX  
DIA  
SEATING PLANE  
Plastic DIP Package  
(N-8)  
0.39 (9.91)  
MAX  
8
5
0.31  
(7.87)  
0.25  
(6.35)  
4
1
0.30 (7.62)  
REF  
PIN 1  
0.10 (2.54)  
TYP  
0.035 ؎ 0.01  
(0.89 ؎ 0.25)  
0.165 ؎ 0.01  
(4.19 ؎ 0.25)  
0.18 ؎ 0.03  
(4.57 ؎ 0.76)  
0.125 (3.18)  
MIN  
0.011 ؎ 0.003  
(0.28 ؎ 0.08)  
0.018 ؎ 0.003 0.033  
(0.46 ؎ 0.08) (0.84)  
NOM  
SEATING  
PLANE  
0-15؇  
–10–  
REV. B  
–11–  
–12–  

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