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FEATURES Improved, Lower Cost, Replacements for Standard 1403, 1403A 3-Terminal Device: Voltage In/Voltage Out Laser Trimmed to High Accuracy: 2.500 V 10 mV (AD1403A) Excellent Temperature Stability: 25 ppm/ C (AD1403A) Low Quiescent Current: 1.5 mA max 10 mA Current Output Capability Low Cost Convenient Mini-DIP Package
Low Cost, Precision 2.5 V IC References AD1403/AD1403A*
FUNCTIONAL BLOCK DIAGRAM
PRODUCT DESCRIPTION
PRODUCT HIGHLIGHTS
The AD1403 and AD1403A are improved three-terminal, low cost, temperature compensated, bandgap voltage references that provide a fixed 2.5 V output voltage for inputs between 4.5 V and 40 V. A unique combination of advanced circuit design and laser-wafer-trimmed thin-film resistors provides the AD1403/ AD1403A with an initial tolerance of 10 mV and a temperature stability of better than 25 ppm/C. In addition, the low quiescent current drain of 1.5 mA (max) offers a clear advantage over classical Zener techniques. The AD1403 or AD1403A is recommended as a stable reference for all 8-, 10- and 12-bit D-to-A converters that require an external reference. In addition, the wide input range of the AD1403/AD1403A allows operation with 5 volt logic supplies, making these devices ideal for digital panel meter applications and when only a single logic supply is available. The AD1403 and AD1403A are specified for operation over the 0C to +70C temperature range. The AD580 series of 2.5 volt precision IC references is recommended for applications where operation over the -55C to +125C range is required.
1. The AD1403A offers improved initial tolerance over the industry-standard 1403A: 10 mV versus 25 mV at a lower cost. 2. The three-terminal voltage in/voltage out operation of the AD1403/AD1403A provides a regulated output voltage without any external components. 3. The AD1403/AD1403A provides a stable 2.5 V output voltage for input voltages between 4.5 V and 40 V making these devices ideal for systems that contain a single logic supply. 4. Thin film resistor technology and tightly controlled bipolar processing provide the AD1403A with temperature stabilities of 25 ppm/C. 5. The low 1.5 mA maximum quiescent current drain of the AD1403 and AD1403A makes them ideal for CMOS and other low power applications.
*Protected by U.S. Patent Numbers: 3,887,863, RE30,586.
REV. A
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
AD1403/AD1403A-SPECIFICATIONS (V
Characteristic Output Voltage (IO = 0 mA) AD1403 AD1403A Temperature Coefficient of Output Voltage AD1403 AD1403A Output Voltage Change, 0C to +70C AD1403 AD1403A Line Regulation (15 V VIN 40 V) (4.5 VIN 15 V) Load Regulation (0 mA < IO < 10 mA) Quiescent Current (IO = 0 mA)
Specifications subject to change without notice.
IN
= 15 V, TA = +25 C unless otherwise noted.)
Typ Max Unit
Symbol VO
Min
2.475 2.490 VO/T
2.500 2.500 10 10
2.525 2.510 40 25
V ppm/C
VO 7.0 4.4 Regin 1.2 0.6 Regload II 1.2 4.5 3.0 10 1.5
mV
mV
mV mA
MAXIMUM RATINGS (TA = +25C unless otherwise noted)
ORDERING GUIDE
Rating Input Voltage Storage Temperature Junction Temperature Operating Ambient Temperature Range
Symbol VIN TSTG TJ TA
Value 40 -25 to 100 +175 0 to +70
Unit V C C C Model AD1403 AD1403A
*N Plastic DIP.
Initial Tolerance 25 mV 10 mV
Package Option* N-8 N-8
Figure 1. AD1403/AD1403A Connection Diagram
Figure 2. Simplified AD1403 Schematic
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REV. A
Typical Performance Curves- AD1403/AD1403A
Figure 3. Typical Change in VOUT vs. VIN (Normalized to VOUT @ VlN = 15 V @ TC = 25C)
Figure 6. Change in VOUT vs. Temperature (Normalized to VOUT @ VIN = 15 V)
Figure 4. Change in Output Voltage vs. Load Current (Normalized to VOUT @ VIN = 15 V, lOUT = 0 mA)
Figure 7. Change in VOUT vs. Temperature (Normalized to VOUT @ VlN = 15 V, IOUT = 0 mA)
VOLTAGE VARIATION VS. TEMPERATURE AND LINE
Some confusion exists in the area of defining and specifying reference voltage error over temperature. Historically, references are characterized using a maximum deviation per degree Centigrade; i.e., 10 ppm/C. However, because of the inconsistent nonlinearities in Zener references (butterfly or "S" type characteristics), most manufacturers use a maximum limit error band approach to characterize their references. This technique measures the output voltage at 3 to 5 different temperatures and guarantees that the output voltage deviation will fall within the guaranteed error band at these discrete temperatures. 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 typical 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.
Figure 5. Quiescent Current vs. Temperature (VIN = 15 V, IOUT = 0 mA)
REV. A
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Applying the AD1403/AD1403A AD1403/AD1403A
The AD1403 exhibits a worst-case shift of 7.5 mV over the entire range of operating input voltage, 4.5 volts to 40 volts. Typically, the shift is less than 1 mV as shown in Figure 3.
THE AD1403A AS A LOW POWER, LOW VOLTAGE PRECISION REFERENCE FOR DATA CONVERTERS
The AD1403A has a number of features that make it ideally suited for use with A/D and D/A data converters used in complex 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 (1.5 mA quiescent current) is commensurate with that of CMOStype devices, while the low cost and small package complements the decreasing cost and size of the latest converters. Figure 8 shows the AD1403A used as a reference for the AD7524 low-cost 8-bit CMOS DAC with complete micro-
Figure 9a. The AD1403 as a Precision Programmable Current Source
Figure 8. Low Power, Low Voltage Reference for the AD7524 Microprocessor-Compatible 8-Bit DAC
processor interface. The AD1403A and the AD7524 are specified to operate from a single 5 volt supply; this eliminates 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 300 A 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 1.5 mA quiescent current. Its laser-trimmed offset voltage preserves the 1/2 LSB linearity of the AD7524KN without user trims and it typically settles to 1/2 LSB 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
Figure 9b. Typical Temperature Coefficient of Current Source OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
8-Pin Mini-DIP (N)
The AD1403 is an excellent building block for precision current sources. Its wide range of operating voltages, 4.5 V to 40 V, along with excellent line regulation over that range (7.5 mV) result in high insensitivity to varying load impedances. The low quiescent current (II) of 1.5 mA (max) and the maximum specified maximum load current of 10 mA allows the user to program current to any value between 1.5 mA and 10 mA. -4- REV. A
PRINTED IN U.S.A.
C551a-9-7/82
Figure 9a 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 II, which has a typical TC of 0.13%/C (1300 ppm/C). The load voltage (and hence current) TC is much lower at 40 ppm/C max (AD1403). Therefore, the overall temperature coefficient decreases rapidly as the load current is increased. Figure 9b shows the typical temperature coefficient for currents between 1.5 mA and 10 mA. Use of an AD1403A will not improve the TC appreciably.

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