Micropower, Precision Series Mode Voltage References AD1582/AD1583/AD1
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FEATURES Series Reference (2.5 4.096 Initial Accuracy: 0.1% Temperature Drift: ppm/ Quiescent Current: Current Output Capability: Wide Supply Range: VOUT Wideband Noise Hz-10 kHz): Operating Temperature Range: Compact, Surface-Mount, SOT-23 Package
Micropower, Precision Series Mode Voltage References AD1582/AD1583/AD1584/AD1585
VOUT
AD1582/3/4/5
VIEW
GENERAL DESCRIPTION
TARGET APPLICATIONS
AD1582, AD1583, AD1584 AD1585 family cost, power, dropout, precision bandgap references. These designs available three-terminal (series) devices packaged compact SOT-23, 3-pin, surface mount package. versatility these references makes them ideal battery powered systems where there wide variations supply voltage need minimize power dissipation. superior accuracy temperature stability AD1582/ AD1583/AD1584/AD1585 made possible precise matching thermal tracking on-chip components. Patented temperature drift curvature correction design techniques have been used minimize nonlinearities voltage output temperature characteristic. These series mode devices (AD1582/AD1583/AD1584/AD1585) will source sink load current operate efficiently with only required headroom. This family will draw maximum quiescent current with only µA/V variation with supply voltage. advantage these designs over conventional shunt devices extraordinary. Valuable supply current longer wasted through input series resistor maximum power efficiency achieved input voltage levels. AD1582, AD1583, AD1584 AD1585 available grades, both which provided smallest available package market, SOT-23. Both grades specified over industrial temperature range -40°C +85°C.
Portable, Battery Powered Equipment. Notebook Computers, Cellular Phones, Pagers, PDAs, GPSs DMMs. Computer Workstations. Suitable with wide range video RAMDACs. Smart Industrial Transmitters. PCMCIA Cards. Automotive. Hard Disk Drives. 8-Bit-12-Bit Data Converters.
SHUNT REFERENCE*
ISUPPLY
AD1582 SERIES REFERENCE
VSUPPLY *3.076k SOURCE RESISTOR
Figure Supply Current Supply Voltage
REV.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Analog Devices. Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Site: http://www.analog.com Fax: 617/326-8703 Analog Devices, Inc., 1997
AD1582/AD1583/AD1584/AD1585
AD1582-SPECIFICATIONS
MIN-TMAX,
unless otherwise noted)
2.52 2.498 AD1582B 2.500 2.502 Units ppm/°C µV/mA µV/mA mV/mA
Model OUTPUT VOLTAGE +25°C) OUTPUT VOLTAGE TEMPERATURE DRIFT MINIMUM SUPPLY HEADROOM (VIN-VOUT) With IOUT LOAD REGULATION IOUT IOUT LOAD REGULATION -100 IOUT LINE REGULATION VOUT +200 IOUT RIPPLE REJECTION (VOUT/VIN) Hz)2 QUIESCENT CURRENT SHORT CIRCUIT CURRENT GROUND NOISE VOLTAGE +25°C) TURN-ON SETTLING TIME 0.1%3 LONG-TERM STABILITY 1000 Hours +25°C4 OUTPUT VOLTAGE HYSTERESIS5 TEMPERATURE RANGE Specified Performance Operating Performance
AD1582A 2.50
2.48
+125
µV/V
ppm/1000 hrs.
NOTES Maximum output voltage drift guaranteed grades. Ripple Rejection over wide frequency spectrum shown Figure Measured with capacitance load Long-term stability +125°C 1600 ppm/1000 hours. Hysteresis defined change 25°C output voltage, caused bringing device +85°C, taking 25°C measurement then bringing -40°C, followed another 25°C measurement. Refer Figure operating temperature range defined temperature extremes which device will still function. Parts deviate from their specified performance outside specified temperature range. Specifications subject change without notice.
REV.
AD1582/AD1583/AD1584/AD1585
AD1583-SPECIFICATIONS
MIN-TMAX,
unless otherwise noted)
3.03 AD1583B 3.000 3.003 Units ppm/°C µV/mA µV/mA mV/mA
Model OUTPUT VOLTAGE +25°C) OUTPUT VOLTAGE TEMPERATURE DRIFT1 MINIMUM SUPPLY HEADROOM (VIN-VOUT) With IOUT LOAD REGULATION IOUT IOUT LOAD REGULATION -100 IOUT LINE REGULATION VOUT +200 IOUT RIPPLE REJECTION (VOUT/VIN) Hz)2 QUIESCENT CURRENT SHORT CIRCUIT CURRENT GROUND NOISE VOLTAGE +25°C) TURN-ON SETTLING TIME 0.1%3 LONG-TERM STABILITY 1000 Hours +25°C OUTPUT VOLTAGE HYSTERESIS4 TEMPERATURE RANGE Specified Performance Operating Performance 2.97
AD1583A 3.00
2.997
+125
µV/V
ppm/1000 hrs.
NOTES Maximum output voltage drift guaranteed grades. Ripple Rejection over wide frequency spectrum shown Figure Measured with capacitance load Hysteresis defined change 25°C output voltage, caused bringing device +85°C, taking 25°C measurement then bringing -40°C, followed another 25°C measurement. Refer Figure operating temperature range defined temperature extremes which device will still function. Parts deviate from their specified performance outside specified temperature range. Specifications subject change without notice.
REV.
AD1582/AD1583/AD1584/AD1585
AD1584-SPECIFICATIONS
MIN-TMAX,
unless otherwise noted)
4.136 AD1584B 4.096 4.100 Units ppm/°C µV/mA µV/mA mV/mA
Model OUTPUT VOLTAGE +25°C) OUTPUT VOLTAGE TEMPERATURE DRIFT MINIMUM SUPPLY HEADROOM (VIN-VOUT) With IOUT LOAD REGULATION IOUT IOUT LOAD REGULATION -100 IOUT LINE REGULATION VOUT +200 IOUT RIPPLE REJECTION (VOUT/VIN) Hz)2 QUIESCENT CURRENT SHORT CIRCUIT CURRENT GROUND NOISE VOLTAGE +25°C) TURN-ON SETTLING TIME 0.1%3 LONG-TERM STABILITY 1000 Hours +25°C OUTPUT VOLTAGE HYSTERESIS4 TEMPERATURE RANGE Specified Performance Operating Performance
AD1584A 4.096
4.056
4.092
+125
µV/V
ppm/1000 hrs.
NOTES Maximum output voltage drift guaranteed grades. Ripple Rejection over wide frequency spectrum shown Figure Measured with capacitance load Hysteresis defined change 25°C output voltage, caused bringing device +85°C, taking 25°C measurement then bringing -40°C, followed another 25°C measurement. Refer Figure operating temperature range defined temperature extremes which device will still function. Parts deviate from their specified performance outside specified temperature range. Specifications subject change without notice.
REV.
AD1582/AD1583/AD1584/AD1585
AD1585-SPECIFICATIONS
MIN-TMAX,
unless otherwise noted)
5.05 4.995 AD1585B 5.000 5.005 Units ppm/°C µV/mA µV/mA mV/mA
Model OUTPUT VOLTAGE +25°C) OUTPUT VOLTAGE TEMPERATURE DRIFT MINIMUM SUPPLY HEADROOM (VIN-VOUT) With IOUT LOAD REGULATION IOUT IOUT LOAD REGULATION -100 IOUT LINE REGULATION VOUT +200 IOUT RIPPLE REJECTION (VOUT/VIN) Hz)2 QUIESCENT CURRENT SHORT CIRCUIT CURRENT GROUND NOISE VOLTAGE +25°C) TURN-ON SETTLING TIME 0.1%3 LONG-TERM STABILITY 1000 Hours +25°C OUTPUT VOLTAGE HYSTERESIS4 TEMPERATURE RANGE Specified Performance Operating Performance
AD1585A 5.00
4.95
+125
µV/V
ppm/1000 hrs.
NOTES Maximum output voltage drift guaranteed grades. Ripple Rejection over wide frequency spectrum shown Figure Measured with capacitance load Hysteresis defined change 25°C output voltage, caused bringing device +85°C, taking 25°C measurement then bringing -40°C, followed another 25°C measurement. Refer Figure operating temperature range defined temperature extremes which device will still function. Parts deviate from their specified performance outside specified temperature range. Specifications subject change without notice.
REV.
AD1582/AD1583/AD1584/AD1585
ABSOLUTE MAXIMUM RATINGS PACKAGE BRANDING INFORMATION
Ground Internal Power Dissipation2 SOT-23 (RT) Storage Temperature Range -65°C +125°C Operating Temperature Range AD1582/AD1583/AD1584/AD1585RT -40°C +85°C Lead Temperature, Soldering Vapor Phase sec) +215°C Infrared sec) +220°C
NOTES Stresses above those listed under Absolute Maximum Ratings cause permanent damage device. This stress rating only; functional operation device these other conditions above those indicated operational section this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability. Specification device free 25°C: SOT-23 Package: 300°C/W.
Four marking fields identify device generic, grade date processing. first field product identifier. "2/3/4/5" identifies generic AD1582/3/4/5. second field indicates device grade; "B." third field numeral letter indicates calendar year; 1997. 2001. fourth field uses letters represent week window within calendar year, starting with first weeks January.
ORDERING GUIDE
Model1 AD1582/AD1583/AD1584/AD1585ART AD1582/AD1583/AD1584/AD1585BRT
NOTES Package Option Models; Surface Mount, SOT-23. Provided 13-inch reel containing 10,000 pieces. Provided 7-inch reel containing 3,000 pieces.
Initial Output Error 1.0% 1.0% 1.0% 0.1% 0.1% 0.1%
Temperature Coefficient ppm/°C ppm/°C ppm/°C ppm/°C ppm/°C ppm/°C
CAUTION (electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although AD1582/AD1583/AD1584/AD1585 feature proprietary protection circuitry, permanent damage occur devices subjected high energy electrostatic discharges. Therefore, proper precautions recommended avoid performance degradation loss functionality.
WARNING!
SENSITIVE DEVICE
REV.
Typical Performance Characteristics- AD1582/AD1583/AD1584/AD1585
0.40
PARTS 0.35 0.30 1585 0.25
mV/mA
0.20 0.15 0.10 0.05
1582
ppm/°C
Volts
Figure Typical Output Voltage Temperature Drift Distribution
Figure Load Regulation
PARTS
-100% -0.60% -0.20% 0.20% VOUT ERROR 0.60% 1.00%
1585
µV/V
1582
IOUT
Figure Typical Output Voltage Error Distribution
Figure Line Regulation ILOAD
2.510 2.508 2.506 2.504
1E+04
IOUT
nV/Hz
VOUT
2.502 2.500 2.498 2.496 2.494 2.492
1E+03
IOUT
TEMPERATURE
1E+02 1E+01
1E+02
1E+03 FREQUENCY
1E+04
1E+05
Figure Typical Temperature Drift Characteristic Curves
Figure Noise Spectral Density
REV.
AD1582/AD1583/AD1584/AD1585
THEORY OPERATION
AD1582/AD1583/AD1584/AD1585 family uses "bandgap" concept produce stable, temperature coefficient voltage references suitable high accuracy data acquisition components systems. This family precision references makes underlying temperature characteristics silicon transistor's base-emitter voltage forward biased operating region. Under this condition, such transistors have mV/°C temperature coefficient (TC) that, when extrapolated absolute zero, 0°K, (with collector current proportional absolute temperature) approximates silicon bandgap voltage. summing voltage that equal opposite temperature coefficient mV/°C with forwardbiased transistor, zero reference developed. AD1582/AD1583/AD1584/AD1585 simplified circuit diagram shown Figure such compensating voltage, derived driving transistors different current densities amplifying resultant difference (VBE-which positive TC). (VBG) then buffered amplified produce stable reference voltage outputs 4.096
VOUT
4.7µF
Figure Typical Connection Diagram
TEMPERATURE PERFORMANCE
AD1582/AD1583/AD1584/AD1585 family references designed applications where temperature performance important. Extensive temperature testing characterization ensures that device's performance maintained over specified temperature range. Some confusion exists, however, area defining specifying reference voltage error over temperature. Historically, references have been characterized using maximum deviation degree centigrade, i.e., ppm/°C. However, because inconsistent nonlinearities standard zener references (such type characteristics), most manufacturers maximum limit error band approach characterize their references. Using this technique, voltage reference output voltage error band specified taking output voltage measurements three more different temperatures. error band guaranteed with AD1582/AD1583/AD1584/ AD1585 family maximum deviation from initial value +25°C; this method more designer than which simply guarantees maximum error band over entire temperature change. Thus, given grade AD1582/AD1583/AD1584/AD1585, designer easily determine maximum total error summing initial accuracy temperature variation (e.g., AD1582BRT, initial tolerance temperature error band thus reference guaranteed from -40°C +85°C). Figure shows typical output voltage drift AD1582 illustrates methodology. Figure bounded x-axis operating temperature extremes, yaxis maximum minimum output voltages observed over operating temperature range. slope diagonal drawn from initial output value +25°C output values +85°C -40°C determines performance grade device. Duplication these results requires test system that highly accurate with stable temperature control. Evaluation AD1582 will produce curves similar those Figures output readings vary depending upon test methods test equipment utilized.
VOUT
Figure Simplified Schematic
APPLYING AD1582/AD1583/AD1584/AD1585
AD1582/AD1583/AD1584/AD1585 family series references that utilized many applications. achieve optimum performance with these references, only external components required. Figure shows AD1582 configured operation under loading conditions. With simple capacitor attached input capacitor applied output, devices will achieve specified performance input voltage output current requirements. best transient response, capacitor parallel with While output capacitor will provide stable performance loading conditions, AD1582 operate under (-100 current conditions with just output capacitor. capacitor input reduced this condition. Unlike conventional shunt reference designs, AD1582/ AD1583/AD1584/AD1585 family provides stable output voltages constant operating current levels. When properly decoupled, shown Figure these devices applied circuit provide superior power solutions.
REV.
AD1582/AD1583/AD1584/AD1585
2.510 2.509 2.508 2.507
VOUT Volts
quantified measuring change +25°C output voltage after temperature excursions from +85°C +25°C, -40°C +25°C. Figure displays distribution AD1582 output voltage hysteresis.
2.506
2.505 2.504 PARTS TEMPERATURE 2.503 2.502 2.501
-700
Figure Output Voltage Temperature
VOLTAGE OUTPUT NONLINEARITY TEMPERATURE
-450
-200
When using voltage reference with data converters, important understand impact that temperature drift have converter's performance. nonlinearity reference output drift represents additional error that cannot easily calibrated overall system. better understand impact such drift have data converter, refer Figure where measured drift characteristic normalized point average drift. residual drift error AD1582 approximately demonstrates that this family references compatible with systems that require 12-bit accurate temperature performance.
Figure Output Voltage Hysteresis Distribution
SUPPLY CURRENT TEMPERATURE
quiescent current AD1582/AD1583/AD1584/ AD1585 family references will vary slightly over temperature input supply range. Figure demonstrates typical performance AD1582 reference when varying both temperature supply voltage. evident from graph, AD1582 supply current increases only µA/V, making this device extremely attractive applications where there wide variations supply voltage need minimize power dissipation.
VOUT
85°C 25°C
-40°C TEMPERATURE Volts
Figure Residual Drift Error
OUTPUT VOLTAGE HYSTERESIS
High performance industrial equipment manufacturers require AD1582/AD1583/AD1584/AD1585 family maintain consistent output voltage error +25°C after references operated over full temperature range. While references exhibit characteristic known output voltage hysteresis, AD1582/AD1583/AD1584/AD1585 family designed minimize this characteristic. This phenomenon
Figure Typical Supply Current over Temperature
REV.
AD1582/AD1583/AD1584/AD1585
PERFORMANCE
1582 PSSR 1585 1.E+00 1.E+01 1.E+02 1.E+03 1.E+04 FREQUENCY 1.E+05 1.E+06
successfully apply AD1582/AD1583/AD1584/AD1585 family references, important understand effects dynamic output impedance power supply rejection. Figure 14a, voltage divider formed AD1582's output impedance external source impedance. Figure shows effect varying load capacitor reference output. Power supply rejection ratio (PSRR) should determined when characterizing performance series voltage reference. Figure shows test circuit used measure PSRR, Figure demonstrates AD1582's ability attenuate line voltage ripple.
VLOAD VOUT ±100µA
Figure 15b. Ripple Rejection Frequency
NOISE PERFORMANCE REDUCTION
Figure 14a. Output Impedance Test Circuit
1585 1582
noise generated AD1582 typically less then over frequency band. Figure shows noise typical AD1582. noise measurement made with high gain bandpass filter. Noise region approximately rms. Figure shows broadband noise typical AD1582. further noise reduction desired, 1-pole low-pass filter added between output ground. time constant will have point roughly will reduce high frequency noise about rms. should noted, however, that while additional filtering output improve noise performance AD1582/AD1583/AD1584/AD1585 family, added output impedance could degrade performance references.
10µV
1E+01
1E+02
1E+03 1E+04 FREQUENCY
1E+05
1E+06
Figure 14b. Output Impedance Frequency
±200mV 0.22µF 0.22µF ±100mV VOUT
Figure 0.1-10 Voltage Noise Figure 15a. Ripple Rejection Test Circuit
100µV
10ms
Figure Wideband Noise
-10-
REV.
AD1582/AD1583/AD1584/AD1585
TURN-ON TIME DYNAMIC PERFORMANCE
Many power instrument manufacturers becoming increasingly concerned with turn-on characteristics components being used their systems. Fast turn-on components often enable user save power keeping power when needed. Turn-on settling time defined time required, after application power (cold start), output voltage reach final value within specified error. major factors affecting this active circuit settling time time required thermal gradients chip stabilize. Figure shows turn-on settling transient response test circuit. Figure displays turn-on characteristic AD1582. This characteristic generated from coldstart operation represents true turn-on waveform after power Figure shows fine settling characteristics AD1582. Typically, reference settles within 0.1% final value about device momentarily draw excessive supply current when VSUPPLY slightly below minimum specified level. Power supply resistance must enough ensure reliable turn-on. Fast power supply edges minimize this effect.
0.22µF 0.22µF VOUT
Many converters present transient current loads reference, poor reference response degrade converter's performance. AD1582/3/4/5 family references been designed provide superior static dynamic line load regulation. Since these series references capable both sourcing sinking large current loads, they exhibit excellent settling characteristics. Figure displays line transient response AD1582. circuit utilized perform such measurement displayed Figure 18a, where input supply voltage toggled from input output capacitors each 0.22 Figures show load transient settling characteristics AD1582 when load current steps applied. input supply voltage remains constant input decoupling output load capacitors respectively, output current toggled. both positive negative current loads, reference responses settle very quickly exhibit initial voltage spikes less than
50µs
Figure 18a. Turn-On/Transient Response Test Circuit
200mV 20µs
50µs
Figure Line Transient Response
20µs
20µs
Figure 18b. Turn-On Characteristics
20µs
20µs
Figure Load Transient Response Load)
20µs
20µs
Figure 18c. Turn-On Settling
20µs
Figure Load Transient Response Load)
REV.
-11-
AD1582/AD1583/AD1584/AD1585
OUTLINE DIMENSIONS
Dimensions shown inches (mm).
Surface Mount Package SOT-23
0.1200 (3.048) 0.1102 (2.799)
0.055 (1.397) 0.0470 (1.194) 0.0236 (0.599) 0.0177 (0.450) 0.0807 (2.050) 0.0701 (1.781)
0.1040 (2.642) 0.0827 (2.101)
0.0413 (1.049) 0.0374 (0.950) 0.0059 (0.150) 0.0440 (1.118) 0.0034 (0.086) 0.0320 (0.813) 0.0210 (0.533) 0.0146 (0.371) 0.0100 (0.254) 0.0050 (0.127) 0.027 (0.686)
0.0040 (0.102) 0.0005 (0.013) SEATING PLANE
TAPE REEL DIMENSIONS
Dimensions shown millimeters.
0.30 0.05
14.4
+0.05 -0.00
0.10 0.05
1.75 0.10
0.30
13.0 (7"REEL) (13"REEL)
0.05
(7") (13")
20.2
DIRECTION UNREELING 0.75
+1.5 -0.0
-12-
REV.
PRINTED U.S.A.
C2976-12-3/97
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