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AD589JR Datasheet(PDF) 4 Page - Analog Devices |
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AD589JR Datasheet(HTML) 4 Page - Analog Devices |
4 / 4 page AD589 REV. B –4– APPLICATION INFORMATION The AD589 functions as a two-terminal shunt-type regulator. It provides a constant 1.23 V output for a wide range of input current from 50 µA to 5 mA. Figure 5 shows the simplest configuration for an output voltage of 1.2 V or less. Note that no frequency compensation is required. If additional filtering is desired for ultralow noise applications, minimum recommended capacitance is 1000 pF. 6.8k Ω 10k Ω AD589 V OUT +5V Figure 5. Basic Configuration for 1.2 V or Less The AD589 can also be used as a building block to generate other values of reference voltage. Figure 6 shows a circuit which produces a buffered 10 V output. Total supply current for this circuit is approximately 2 mA. AD589 +15V 7 6 8 1 4 3 2 0.01µF AD108A 15k Ω 1k Ω 1k Ω 8.2k Ω 10V Figure 6. Single Supply Buffered 10 V Reference The low power operation of the AD589 makes it ideal for use in battery operated portable equipment. It is especially useful as a reference for CMOS analog-to-digital converters. Figure 7 shows the AD589 used in conjunction with two popular integrating type CMOS A/D converters. AD589 5.6k Ω 6.8k Ω 2k Ω +5V +V 7109 REF+ REF– REF OUT a. With 7109 12-Bit Binary A/D AD589 6.2k Ω 10k Ω 1k Ω +5V +V 7107 REF HI REF LO COMMON b. With 7107 Panel Meter A/D Figure 7. AD589 Used as Reference for CMOS A/D Converters The AD589 also is useful as a reference for CMOS multiplying DACs such as the AD7533. These DACs require a negative reference voltage in order to provide a positive output range. Figure 8 shows the AD589 used to supply an equivalent –1.0 V reference to an AD7533. AD589 2 1 16 RFB OUT1 OUT2 REF GND VDD +15V R2 5k Ω 14 15 3 R1 39k Ω –15V VOUT = 0 TO 1.00V MSB LSB 2 345 67 89 BIT 1 BIT 10 AD7533 SERIES AD542L Figure 8. AD589 as Reference for 10-Bit CMOS DAC OUTLINE DIMENSIONS AND PIN DESIGNATIONS Dimensions shown in inches and (mm). 0.10 (2.54) 45° 0.500 (12.7) MIN DIA 0.195 (4.95) 0.178 (4.52) 0.028 (0.71) 0.048 (1.22) 0.036 (0.91) 0.046 (1.17) DIA 0.209 (5.31) 0.230 (5.84) 0.150 (3.81) 0.125 (3.17) 0.015 (0.38) 0.019 (0.48) |
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