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Details, datasheet, quote on part number:AD584JN
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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
Pin Programmable Precision Voltage Reference AD584*
PIN CONFIGURATIONS
8-Pin TO-99
8-Pin DIP GENERAL DESCRIPTION
The AD584 is an eight-terminal precision voltage reference offering 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 and 30 volts. 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, lowpower 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 typically 750 µA 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 converters 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-pin plastic DIP.
*Protected by U.S. Patent No. 3,887,863; RE 30,586
PRODUCT HIGHLIGHTS
1. The flexibility of the AD584 eliminates the need to designin and inventory several different voltage references. Furthermore one AD584 can serve as several references simultaneously when buffered properly. 2. Laser trimming of both initial accuracy and temperature coefficient results in very low errors over temperature without the use of external components. The AD584LH has a maximum deviation from 10.000 volts of ± 7.25 mV from 0°C to + 7 0° 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" 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 tolerated 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 MILSTD-883. Refer to the Analog Devices Military Products Databook or current AD584/883B 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
AD584SPECIFICATIONS (@ V
Model Min OUTPUT VOLTAGE TOLERANCE Maximum Error1 for Nominal Outputs of: 10.000 V 7.500 V 5.000 V 2.500 V OUTPUT VOLTAGE CHANGE Maximum Deviation from +25°C Value, TMIN to TMAX2 10.000 V, 7.500 V, 5.000 V Outputs 2.500 V Output Differential Temperature Coefficients Between Outputs QUIESCENT CURRENT Temperature Variation TURN-ON SETTLING TIME TO 0.1% NOISE (0.1 Hz to 10 Hz) LONG-TERM STABILITY SHORT-CIRCUIT CURRENT LINE REGULATION (No Load) 15 V VIN 30 V (VOUT +2.5 V) VIN 15 V LOAD REGULATION 0 IOUT 5 mA, All Outputs OUTPUT CURRENT VIN VOUT +2.5 V Source @ +25°C Source TMIN to TMAX Sink TMIN to TMAX TEMPERATURE RANGE Operating Storage PACKAGE OPTION3 TO-99 (H-08A) Plastic (N-8)
IN
= +15 V and 25 C)
Min AD584K Typ Max Min AD584L Typ Max Units
AD584J Typ Max
30 20 15 7.5
10 8 6 3.5
5 4 3 2.5
mV mV mV mV
30 30 5 0.75 1.5 200 50 25 30 0.002 0.005 20 50 20 3 0.75 1.5 200 50 25 30
15 15 3 0.75 1.5 200 50 25 30 0.002 0.005 50 20
5 10
p p m /° C p p m /° C ppm/ °C mA µA/°C µs µV p-p ppm/1000 Hrs mA
1.0
1.0
1.0
0.002 0.005 50
%/V %/V ppm/mA
10 5 5 0 65 AD584JH AD584JN +70 +175
10 5 5 0 65 +70 +175 AD584KH AD584KN
10 5 5 0 65 +70 +175 AD584LH
mA mA mA °C °C
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.
METALIZATION PHOTOGRAPH
Dimensions shown in inches and (mm).
ABSOLUTE MAXIMUM RATINGS
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
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AD584
Model Min OUTPUT VOLTAGE TOLERANCE Maximum Error1 for Nominal Outputs of: 10.000 V 7.500 V 5.000 V 2.500 V OUTPUT VOLTAGE CHANGE Maximum Deviation from +25°C Value, TMIN to TMAX2 10.000 V, 7.500 V, 5.000 V Outputs 2.500 V Output Differential Temperature Coefficients Between Outputs QUIESCENT CURRENT Temperature Variation TURN-ON SETTLING TIME TO 0.1% NOISE (0.1 Hz to 10 Hz) LONG-TERM STABILITY SHORT-CIRCUIT CURRENT LINE REGULATION (No Load) 15 V VIN 30 V (VOUT +2.5 V) VIN 15 V LOAD REGULATION 0 IOUT 5 mA, All Outputs OUTPUT CURRENT VIN VOUT +2.5 V Source @ +25°C Source TMIN to TMAX Sink TMIN to TMAX TEMPERATURE RANGE Operating Storage PACKAGE OPTION TO-99 (H-08A) 20 AD584S Typ Max Min AD584T Typ Max Units
30 20 15 7.5
10 8 ±6 3.5
mV mV mV mV
30 30 5 0.75 1.5 200 50 25 30 0.002 0.005 50 20 1.0 3 0.75 1.5 200 50 25 30
15 20
p p m /° C p p m /° C ppm/°C
1.0
mA µA/°C µs µV p-p ppm/1000 Hrs mA
0.002 0.005 50
%/V %/V ppm/mA
10 5 5 55 65 AD584SH +125 +175
10 5 5 55 65 +125 +175 AD584TH
mA mA mA °C °C
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.
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AD584
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 programming pins as follows: Output Voltage 7.5 V 5.0 V 2.5 V
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. 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 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.
Pin Programming 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 additional 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 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 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 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 adjustment (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, the upper limit of the output
Figure 3. Schematic Diagram
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AD584
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 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 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 guaranteed to be 10.000 volts ± 25 mV from 55°C to +125°C.
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 µs, and there is no long thermal tail appearing after the point.
Figure 6. Output Settling Characteristic
NOISE FILTERING
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 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 output) is about 28 mA; when shorted to +15 volts, the sink current goes to about 20 mA.
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 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 increasingly concerned with the turn-on characteristics of the components being used in their systems. Fast turn-on components often enable the end user to keep power off when not REV. A
Figure 8. Spectral Noise Density and Total rms Noise vs. Frequency
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