ANALOG DEVICES AD1403/AD1403A* Low Cost Precision 2.5 V IC References handbook
Contents
1. MAXIMUM RATINGS T 25 C unless otherwise noted ORDERING GUIDE Symbol Value vn 49 Cw ss j Specifications subject to change without notice Initial Model Tolerance AD1403 25mV 10mV AD1403A N Plastic DIP For outline information see Package Information section ze Storage Temperature junction Temperature Operating Ambient Temperature Range Vin COM Figure 1 Simplified AD1403 Schematic pudet eese REV A WWW dzsc Typical Performance Curves AD1403 AD1403A 4ANVour CHANGE IN Vour mV AVour CHANGE IN Vout mV TA TEMPERATURE C Vin INPUT VOLTAGE Volts Figure 5 Change in Vou vs Temperature Figure 2 Typical Change in VOUT vs VIN Normalized to VouT Vin 15V Normalized ta VoUT Vin 15V Tc 25 C gt E i g 3 Z z w lt T E E d 3 2 lour OUTPUT CURRENT mA Ta TEMPERATURE C Figure 3 Change in Output Voltage vs Load Current Figure 6 Change in VouT vs Temperature Normalized to VouT VIN 15V IOUT OMA Normalized to VouT Vin 15V IOUT OMA 1 15 FT oad De Pet eT E 1 05 S O 1 00 SERRE E w 0 95 8 LLLI 0 10 20 30 40 50 60 70 80 Ta TEMPERATURE C Figure 4 Quiescent Current vs Temperature Vin 15V IOUT OMA REV z VOLTAGE REFERENCES 6 73 www dzsc amp i Applying the AD1403 AD1403A VOLTAGE VARIATION VS2. TEMPERATURE COEFFICIENT OF Isour e ppm C Figure 8b Source REV A
3. AD14034A has a number of features that make it ideally suited for use with A D and D A data converters used in com plex microprocessor based systems The calibrated 2 500 volt output minimizes user trim requirements and allows operation from a single low voltage supply Low power consumption 1 5mA quiescent current is commensurate with that of CMOS type devices while the low cost and small package complements the decreasing cost and size of the latest converters DECODED MEMW v Device o a CY system ADDRESS 5a DATA BUS AD7524 DAC 2 OUTPUT Figure 7 Low Power Low Voltage Reference for the AD7524 Microprocessor Compatible 8 Bit DAC WWW dzsc Figure 9 shows the AD1403A used as a reference for the AD7524 low cost 8 bit CMOS DAC with complete micro processor interface The AD1403A and the AD7524 are specified to operate from a single 5 volt supply this elimi nates the need to provide a 15 volt power supply for the sole purpose of operating a reference The AD7524 includes an 8 bit data register and address decoding logic it may thus be interfaced directly to an 8 or 16 bit data bus Only 3004A of quiescent current from the single 5 volt supply is required to operate the AD7524 which is packaged in a small 16 pin DIP The AD542 output amplifier is also low power requiring only 1 5mA quiescent current Its laser trimmed offset voltage preserves the 1 2LSB linearity of the AD7524KN without user trims and it typica
4. TEMPERATURE AND LINE Some confusion exists in the area of defining and specifying reference voltage error over temperature Historically refer ences are characterized using a maximum deviation per degree Centigrade i e 10ppm C However because of the inconsis tent nonlinearities in zener references butterfly or S type characteristics most manufacturers use a maximum limit error band approach to characterize their references This tech nique measures the output voltage at 3 to 5 different tempera tures and guarantees that the output voltage deviation will fall within the guaranteed error band at these discrete tempera tures This approach of course makes no mention or guarantee of performance at any other temperature within the operating temperature range of the device The consistent Voltage vs Temperature performance of a typi cal AD1403 is shown in Figure 6 Note that the characteristic is quasi parabolic not the possible S type characteristics of classical zener references This parabolic characteristic permits a maximum output deviation specification over the device s full operating temperature range rather than just at 3 to 5 discrete temperatures The AD1403 exhibits a worst case shift of 7 5mV over the en tire range of operating input voltage 4 5 volts to 40 volts Typically the shift is less than 1mV as shown in Figure 3 THE AD1403A AS A LOW POWER LOW VOLTAGE PRECISION REFERENCE FOR DATA CONVERTERS The
5. 1403 or AD1403A is recommended as a stable refer supply ence for all 8 10 and 12 bit D to A converters that require 4 Thin film resistor technology and tightly controlled bipolar an external reference In addition the wide input range of the processing provide the AD1403A with temperature stabili AD1403 AD1403A allows operation with 5 volt logic supplies ties of 25ppm C making these devices ideal for digital panel meter applications 5 The low 1 5mA maximum quiescent current drain of the and when only a single logic supply is available AD1403 and AD1403A makes them ideal for CMOS and The AD1403 and AD1403A are specified for operation over other low power applications the 0 to 70 C temperature range The AD580 series of 2 5 volt precision IC references is recommended for applications where operation over the 55 C to 125 C range is required Covered by Patent Numbers 3 887 863 RE30 5B6 REV VOLTAGE REFERENCES 6 771 WWW dzsc ADT 403 ADT 403A SPECIFICATIONS Vy 15V T 25 C unless otherwise noted Output Voitage Io OmA Vo AD1403 2 475 2 525 V AD1403A 2 490 2 510 Temperature Coefficient of Output Voltage AVo AT ppm c AD1403 40 AD1403A 25 Output Voltage Change 0 to 70 C AVo mV AD1403 7 0 AD1403A 4 4 Line Regulation Regin mV 15V amp Vixg S40V 1 2 4 5 4 5 Vj 4 amp 15V 0 6 3 0 Load Regulation Regioad 10 mV OmA lt Ig lt 10mA Quiescent Current 1 2 1 5 mA Io OmA
6. AHAD 1403A NEA R3 ANALOG Low Cost Precision DEVICES 2 9V IC References AD1403 AD1403A FEATURES FUNCTIONAL BLOCK DIAGRAM Improved Lower Cost Replacements for Standard 1403 1403A 3 Terminal Device Voltage In Voltage Out Laser Trimmed to High Accuracy 2 500V 10mV AD1403A Excellent Temperature Stability 25ppm C AD1403A Low Quiescent Current 1 5mA max 10mA Current Output Capability Low Cost Convenient Mini DIP Package 8 PIN MINI DIP PRODUCT DESCRIPTION PRODUCT HIGHLIGHTS The AD1403 and AD14034A are improved three terminal low 1 The AD1403A offers improved initial tolerance over the cost temperature compensated bandgap voltage references industry standard 1403A 10mV versus 25mV ata that provide a fixed 2 5V output voltage for inputs between lower cost mI 4 5V and 40V A unique combination of advanced circuit de 2 The three terminal voltage in voltage out operation of the sign and laser wafer trimmed thin film resistors provides the AD1403 AD1403A provides a regulated output voltage AD1403 AD1403A with an initial tolerance of x10mV and a without any external components temperature stability of better than 25ppm C In addition 3 The AD1403 AD1403A provides a stable 2 5V output the low quiescent current drain of 1 5mA max offers a clear voltage for input voltages between 4 5V and 40V making advantage over classical Zener techniques these devices ideal for systems that contain a single logic The AD
7. lly settles to 1 2LSB in less than 5 microseconds It will provide the 0 volt to 2 5 volt output swing from 5 volt supplies THE AD1403 AS A PRECISION PROGRAMMABLE CURRENT SOURCE The AD1403 is an excellent building block for precision current sources Its wide range of operating voltages 4 5V to 40V along with excellent line regulation over that range 7 5mV result in high insensitivity to varying load impedances The low quiescent current 1j of 1 5mA max and the maxi mum specified maximum load current of 10mA allows the user to program current to any value between 1 5m A and 10mA Figure 10a shows the AD1403 connected as a current source Total current is equal to the quiescent current plus the load current Most of the temperature coefficient comes from the quiescent current term Ij which has a typical TC of 0 43 C 1300ppm C The load voltage and hence current TC is much lower at 40ppm C max AD1403 Therefore the over all temperature coefficient decreases rapidly as the load cur rent is increased Figure 10b shows the typical temperature coefficient for currents between 1 5mA and 10mA Use of an AD1403A will not improve the TC appreciably 15 0 V 40V IL 0 TO 10mA h i _ 2 50V 1 0mA typ Rset si l i SOURCE gt Toma d Figure 8a The AD1403 as a Precision Programmable Current Source 1500 1000 Te 3990 OL Comite URCE 5 10 ISOURCE JA Typical Temperature Coefficient of Current
Download Pdf Manuals
Related Search
ANALOG DEVICES AD1403/AD1403A* Low Cost Precision 2.5 V IC References handbook