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AD589JR Datasheet(PDF) 5 Page - Analog Devices |
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AD589JR Datasheet(HTML) 5 Page - Analog Devices |
5 / 8 page AD589 –5– APPLICATION INFORMATION The AD589 functions as a 2-terminal shunt-type regulator. It provides a constant 1.23 V output for a wide range of input current from 50 A to 5 mA. Figure 5 shows the simplest con- figuration 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. ����� ���� ���� �� ����� 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 that produces a buffered 10 V output.Total supply current for this circuit is approximately 2 mA. ��� � � � � � � � ������ ���� ��� ��� ����� ��� ������ ����� 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 ADCs. ����� ����� ����� ��� �� �� ���� ���� ���� ��� ��� a. With 7109 12-Bit Binary ADC ����� ����� ���� ��� �� �� ���� ��� �� ��� �� ������ b. With 7107 Panel Meter ADC Figure 7. AD589 Used as Reference for CMOS ADCs 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. ����� � � �� ��� ���� ���� ��� ��� ��� ���� �� ��� �� �� � �� ��� W ���� ���� � � �� ����� ��� ��� � � � � � � � � ��� � ��� �� ������ ������ ������ Figure 8. AD589 as Reference for 10-Bit CMOS DAC REV. C |
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