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FEATURES Laser Trimmed to High Accuracy: 5.000 V 2.0 mV (M Grade) Trimmed Temperature Coefficient: 2 ppm/ C max, 0 C to +70 C (M Grade) 5 ppm/ C max, -40 C to +85 C (B & L Grades) 10 ppm/ C max, -55 C to +125 C (T Grade) Low Noise, 100 nV/Hz Noise Reduction Capability Output Trim Capability MIL-STD-883 Compliant Versions Available Industrial Temperature Range SOICs Available Output Capable of Sourcing or Sinking 10 mA
High Precision 5 V Reference AD586
FUNCTIONAL BLOCK DIAGRAM
PRODUCT DESCRIPTION
PRODUCT HIGHLIGHTS
The AD586 represents a major advance in the state-of-the-art in monolithic voltage references. Using a proprietary ion-implanted buried Zener diode and laser wafer trimming of high stability thin-film resistors, the AD586 provides outstanding performance at low cost. The AD586 offers much higher performance than most other 5 V references. Because the AD586 uses an industry standard pinout, many systems can be upgraded instantly with the AD586. The buried Zener approach to reference design provides lower noise and drift than bandgap voltage references. The AD586 offers a noise reduction pin which can be used to further reduce the noise level generated by the buried Zener. The AD586 is recommended for use as a reference for 8-, 10-, 12-, 14- or 16-bit D/A converters which require an external precision reference. The device is also ideal for successive approximation or integrating A/D converters with up to 14 bits of accuracy and, in general, can offer better performance than the standard on-chip references. The AD586J, K, L and M are specified for operation from 0C to +70C, the AD586A and B are specified for -40C to +85C operation, and the AD586S and T are specified for -55C to +125C operation. The AD586J, K, L and M are available in an 8-pin plastic DIP. The AD586J, K, L, A and B are available in an 8-pin plastic surface mount small outline (SO) package. The AD586J, K, L, S and T are available in an 8-pin cerdip package.
1. Laser trimming of both initial accuracy and temperature coefficients results in very low errors over temperature without the use of external components. The AD586M has a maximum deviation from 5.000 V of 2.45 mV between 0C and +70C, and the AD586T guarantees 7.5 mV maximum total error between -55C and +125C. 2. For applications requiring higher precision, an optional finetrim connection is provided. 3. Any system using an industry standard pinout reference can be upgraded instantly with the AD586. 4. Output noise of the AD586 is very low, typically 4 V p-p. A noise reduction pin is provided for additional noise filtering using an external capacitor. 5. The AD586 is available in versions compliant with MILSTD-883. Refer to the Analog Devices Military Products Databook or current AD586/883B data sheet for detailed specifications.
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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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703
AD586-SPECIFICATIONS (@ T = + 25C, V
A
IN
= +15 V unless otherwise noted)
AD586M AD586S Min Typ Max Min Typ Max 5.002 4.990 AD586T Min Typ Max
Model Output Voltage Output Voltage Drift 0C to +70C -55C to +125C Gain Adjustment Line Regulation 1 10.8 V < +VIN < 36 V TMIN to TMAX 11.4 V < +V IN < 36 V TMIN to TMAX Load Regulation l Sourcing 0 < IOUT < 10 mA 25C TMIN to TMAX Sinking -10 < I OUT < 0 mA 25C Quiescent Current Power Consumption Output Noise 0.1 Hz to 10 Hz Spectral Density, 100 Hz Long-Term Stability Short-Circuit Current-to-Ground Temperature Range Specified Performance 2 Operating Performance 3
l
AD586J AD586K/A Min Typ Max Min Typ Max 4.980 5.020 4.995
AD586L/B Min Typ Max
Units
5.005 4.9975
5.0025 4.998
5.010 4.9975
5.0025 V
25
15
5
2 20 10 +6 -2
ppm/C
+6 -2
+6 -2
+6 -2
+6 -2
+6 -2
%
100
100
100
100 150 150
V/V
100 100 400 2 30 3 2 30
100 100 400 3 2 30
100 100 400 3 2 30
100 100 400 3 2 30
150 150 400 3 2 30
150 150 400 3
V/mA
mA mW V p-p nV/Hz ppm/1000 Hr mA C
4 100 15 45 60
4 100 15 45 60
4 100 15 45 60
4 100 15 45 60
4 100 15 45 60
4 100 15 45 60
0 -40
+70 +85
0 -40 -40
+70 +85 +85
0 -40 -40
+70 +85 +85
0 -40
+70 +85
-55 -55
+125 -55 +125 -55
+125 +125
NOTES 1 Maximum output voltage drift is guaranteed for all packages and grades. Cerdip packaged parts are also 100C production tested. 2 Lower row shows specified performance for A and B grades. 3 The operating temperature range is defined as the temperatures extremes at which the device will still function. Parts may deviate from their specified performance outside their specified temperature range. Specifications subject to change without notice. Specifications in boldface are rested 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 unless otherwise specified.
ABSOLUTE MAXIMUM RATINGS *
VIN to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 V Power Dissipation (25C) . . . . . . . . . . . . . . . . . . . . . 500 mW Storage Temperature . . . . . . . . . . . . . . . . . . -65C to +150C Lead Temp (Soldering, 10 sec) . . . . . . . . . . . . . . . . . . +300C Package Thermal Resistance JC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22C/W JA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110C/W Output Protection: Output safe for indefinite short to ground or VIN.
*Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and 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.
CONNECTION DIAGRAM (Top View)
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AD586 DlE SPECIFlCATIONS only. (T = +25 C, V
Parameter Output Voltage Gain Adjustment Line Regulation 10.8 V < + VIN < 36 V Load Regulation Sourcing 0 < IOUT < 10 mA Sinking -10 < IOUT < 0 mA Quiescent Current Short-Circuit Current-to-Ground 4.980 +6 -2
The following specifications are tested at the die level for AD586JCHIPS. These die are probed at 25 C A IN = +15 V unless otherwise noted)
AD586JCHIPS Min Typ Max 5.020 Units V % % V/V V/mA V/mA mA mA
100 100 400 3 60
NOTES 1 Both V OUT pads should be connected to the output. Die Thickness: The standard thickness of Analog Devices Bipolar dice is 24 mils 2 mils. Die Dimensions: The dimensions given have a tolerance of 2 mils. Backing: The standard backside surface is silicon (not plated). Analog Devices does not recommend gold-backed dice for most applications. Edges: A diamond saw is used to separate wafers into dice thus providing perpendicular edges half-way through the die. In contrast to scribed dice, this technique provides a more uniform die shape and size. The perpendicular edges facilitate handling (such as tweezer pick-up) while the uniform shape and size simplifies substrate design and die attach. Top Surface: The standard top surface of the die is covered by a layer of glassivation. All areas are covered except bonding pads and scribe lines. Surface Metalization: The metalization to Analog Devices bipolar dice is aluminum. Minimum thickness is 10,000A. Bonding Pads: All bonding pads have a minimum size of 4 mils by 4 mils. The passivation windows have 3.5 mils by 3.5 mils minimum.
ORDERING GUIDE
Model1 AD586JN AD586JQ AD586JR AD586KN AD586KQ AD586KR AD586LN AD586LR AD586MN AD586AR AD586BR AD586LQ AD586SQ AD586TQ AD586JCHIPS
Initial Error 20 mV 20 mV 20 mV 5 mV 5 mV 5 mV 2.5 mV 2.5 mV 2 mV 5 mV 2.5 mV 2.5 mV 10 mV 2.5 mV 20 mV
Temperature Coefficient 25 ppm/C 25 ppm/C 25 ppm/C 15 ppm/C 15 ppm/C 15 ppm/C 5 ppm/C 5 ppm/C 2 ppm/C 15 ppm/C 5 ppm/C 5 ppm/C 20 ppm/C 10 ppm/C 25 ppm/C
Temperature Range 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C 0C to +70C -55C to +125C -55C to +125C 0C to +70C
Package Option2 N-8 Q-8 SO-8 N-8 Q-8 SO-8 N-8 SO-8 N-8 SO-8 SO-8 Q-8 Q-8 Q-8
NOTES 1 For details on grade and package offerings screened in accordance with MIL-STD-883, r efer to the Analog Devices Military Products Databook or current AD586/883B data sheet. 2 N = Plastic DIP; Q = Cerdip; SO = Small Outline IC (SOIC).
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 AD586 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
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AD586
THEORY OF OPERATION NOISE PERFORMANCE AND REDUCTION
The AD586 consists of a proprietary buried Zener diode reference, an amplifier to buffer the output and several high stability thin-film resistors as shown in the block diagram in Figure 1. This design results in a high precision monolithic 5 V output reference with initial offset of 2.0 mV or less. The temperature compensation circuitry provides the device with a temperature coefficient of under 2 ppm/C. Using the bias compensation resistor between the Zener output and the noninverting input to the amplifier, a capacitor can be added at the NOISE REDUCTION pin (Pin 8) to form a lowpass filter and reduce the noise contribution of the Zener to the circuit.
The noise generated by the AD586 is typically less than 4 V p-p over the 0.1 Hz to 10 Hz band. Noise in a 1 MHz bandwidth is approximately 200 V p-p. The dominant source of this noise is the buried Zener which contributes approximately 100 nV/Hz. In comparison, the op amp's contribution is negligible. Figure 3 shows the 0.1 Hz to 10 Hz noise of a typical AD586. The noise measurement is made with a bandpass filter made of a 1-pole high-pass filter with a corner frequency at 0.1 Hz and a 2-pole low-pass filter with a corner frequency at 12.6 Hz to create a filter with a 9.922 Hz bandwidth. If further noise reduction is desired, an external capacitor may be added between the NOISE REDUCTION pin and ground as shown in Figure 2. This capacitor, combined with the 4 k RS and the Zener resistances form a low-pass filter on the output of the Zener cell. A 1 F capacitor will have a 3 dB point at 12 Hz, and it will reduce the high frequency (to 1 MHz) noise to about 160 V p-p. Figure 4 shows the 1 MHz noise of a typical AD586 both with and without a 1 F capacitor.
Figure 1. AD586 Functional Block Diagram
APPLYING THE AD586
The AD586 is simple to use in virtually all precision reference applications. When power is applied to Pin 2 and Pin 4 is grounded, Pin 6 provides a 5 V output. No external components are required; the degree of desired absolute accuracy is achieved simply by selecting the required device grade. The AD586 requires less than 3 mA quiescent current from an operating supply of +12 V or +15 V. An external fine trim may be desired to set the output level to exactly 5.000 V (calibrated to a main system reference). System calibration may also require a reference voltage that is slightly different from 5.000 V, for example, 5.12 V for binary applications. In either case, the optional trim circuit shown in Figure 2 can offset the output by as much as 300 mV, if desired, with minimal effect on other device characteristics.
Figure 3. 0.1 Hz to 10 Hz Noise
Figure 4. Effect of 1 F Noise Reduction Capacitor on Broadband Noise
TURN-ON TIME
Figure 2. Optional Fine Trim Configuration
Upon application of power (cold start), the time required for the output voltage to reach its final value within a specified error band is defined as the turn-on settling time. Two components normally associated with this are: the time for the active circuits to settle, and the time for the thermal gradients on the chip to stabilize. Figure 5 shows the turn-on characteristics of the AD586. It shows the settling to be about 60 sec to 0.01%. Note the absence of any thermal tails when the horizontal scale is expanded to l ms/cm in Figure 5b.
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AD586
Output turn-on time is modified when an external noise reduction capacitor is used. When present, this capacitor acts as an additional load to the internal Zener diode's current source, resulting in a somewhat longer turn-on time. In the case of a 1 F capacitor, the initial turn-on time is approximately 400 ms to 0.01% (see Figure 5c).
DYNAMIC PERFORMANCE
The output buffer amplifier is designed to provide the AD586 with static and dynamic load regulation superior to less complete references. Many A/D and D/A converters present transient current loads to the reference, and poor reference response can degrade the converter's performance. Figure 6 displays the characteristics of the AD586 output amplifier driving a 0 mA to 10 mA load.
Figure 5. Turn-On Characteristics
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AD586
In some applications, a varying load may be both resistive and capacitive in nature, or the load may be connected to the AD586 by a long capacitive cable. Figure 7 displays the output amplifier characteristics driving a 1000 pF, 0 to 10 mA load. Centigrade; i.e., ppm/C. However, because of nonlinearities in temperature characteristics which originated in standard Zener references (such as "S" type characteristics), most manufacturers have begun to use a maximum limit error band approach to specify devices. This technique involves the measurement of the output at three or more different temperatures to specify an output voltage error band. Figure 9 shows the typical output voltage drift for the AD586L and illustrates the test methodology. The box in Figure 9 is bounded on the sides by the operating temperature extremes, and on the top and the bottom by the maximum and minimum output voltages measured over the operating temperature range. The slope of the diagonal drawn from the lower left to the upper right corner of the box determines the performance grade of the device.
Figure 7a. Capacitive Load Transient Response Test Circuit
Figure 7b. Output Response with Capacitive Load
LOAD REGULATION
Figure 9. Typical AD586L Temperature Drift
The AD586 has excellent load regulation characteristics. Figure 8 shows that varying the load several mA changes the output by a few V. The AD586 has somewhat better load regulation performance sourcing current than sinking current.
Each AD586J, K and L grade unit is tested at 0C, +25C and +70C. Each AD586SQ and TQ grade unit is tested at -55C, +25C and +125C. This approach ensures that the variations of output voltage that occur as the temperature changes within the specified range will be contained within a box whose diagonal has a slope equal to the maximum specified drift. The position of the box on the vertical scale will change from device to device as initial error and the shape of the curve vary. The maximum height of the box for the appropriate temperature range and device grade is shown in Figure 10. Duplication of these results requires a combination of high accuracy and stable temperature control in a test system. Evaluation of the AD586 will produce a curve similar to that in Figure 9, but output readings may vary depending on the test methods and equipment utilized.
DEVICE GRADE MAXIMUM OUTPUT CHANGE (mV) 0 C TO +70 C AD586J AD586K AD586L AD586M AD586A AD586B AD586S AD586T 8.75 5.25 1.75 0.70 3.12 9.37 18.00 9.00 -40 C TO +85 C -55 C TO +125 C
Figure 8. Typical Load Regulation Characteristics
TEMPERATURE PERFORMANCE
The AD586 is designed for precision reference applications where temperature performance is critical. Extensive temperature testing ensures that the device's high level of performance is maintained over the operating temperature range. Some confusion exists in the area of defining and specifying reference voltage error over temperature. Historically, references have been characterized using a maximum deviation per degree -6-
Figure 10. Maximum Output Change in mV
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AD586
NEGATIVE REFERENCE VOLTAGE FROM AN AD586
The AD586 can be used to provide a precision -5.000 V output as shown in Figure 11. The VIN pin is tied to at least a +6 V supply, the output pin is grounded, and the AD586 ground pin is connected through a resistor, RS, to a -15 V supply. The -5 V output is now taken from the ground pin (Pin 4) instead of VOUT. It is essential to arrange the output load and the supply resistor RS so that the net current through the AD586 is between 2.5 mA and 10.0 mA. The temperature characteristics and long-term stability of the device will be essentially the same as that of a unit used in the standard +5 V output configuration.
Figure 13. AD586 as a 5 V Reference for a CMOS Dual DAC
STACKED PRECISION REFERENCES FOR MULTIPLE VOLTAGES
Figure 11. AD586 as a Negative 5 V Reference
USING THE AD586 WITH CONVERTERS
The AD586 is an ideal reference for a wide variety of 8-, 12-, 14- and 16-bit A/D and D/A converters. Several representative examples follow.
5 V REFERENCE WITH MULTIPLYING CMOS D/A OR A/D CONVERTERS
Often, a design requires several reference voltages. Three AD586s can be stacked, as shown in Figure 14, to produce +5.000 V, +10.000 V, and +15.000 V outputs. This scheme can be extended to any number of AD586s as long as the maximum load current is not exceeded. This design provides the additional advantage of improved line regulation on the +5.0 V output. Changes in VIN of +18 V to +50 V produces an output change that is below the noise level of the references.
The AD586 is ideal for applications with 10- and 12-bit multiplying CMOS D/A converters. In the standard hookup, as shown in Figure 12, the AD586 is paired with the AD7545 12-bit multiplying DAC and the AD711 high-speed BiFET Op Amp. The amplifier DAC configuration produces a unipolar 0 V to -5 V output range. Bipolar output applications and other operating details can be found on the individual product data sheets.
Figure 14. Multiple AD586s Stacked for Precision 5 V, 10 V and 15 V Outputs Figure 12. Low-Power 12-Bit CMOS DAC Application
The AD586 can also be used as a precision reference for multiple DACs. Figure 13 shows the AD586, the AD7628 dual DAC and the AD712 dual op amp hooked up for single supply operation to produce 0 V to -5 V outputs. Because both DACs are on the same die and share a common reference and output op amps, the DAC outputs will exhibit similar gain TCs.
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AD586
PRECISION CURRENT SOURCE
PRECISION HIGH CURRENT SUPPLY
Figure 15. Precision Current Source
For higher currents, the AD586 can easily be connected to a power PNP or power Darlington PNP device. The circuit in Figure 16 can deliver up to 4 amps to the load. The 0.1 F
capacitor is required only if the load has a significant capacitive component. If the load is purely resistive, improved highfrequency supply rejection results can be obtained by removing the capacitor.
Figure 16a. Precision High-Current Current Source
Figure 16b. Precision High-Current Voltage Source
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm.)
Mini-DIP (N-8) Package
Cerdip (Q-8) Package
Small Outline (R-8) Package
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PRINTED IN U.S.A.
C1069b-2-10/93
The design of the AD586 allows it to be easily configured as a current source. By choosing the control resistor RC in Figure 15, you can vary the load current from the quiescent current (2 mA typically) to approximately 10 mA. The compliance voltage of this circuit varies from about +5 V to +21 V depending upon the value of VIN.

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