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AM462 データシート(PDF) 11 Page - Analog Microelectronics |
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AM462 データシート(HTML) 11 Page - Analog Microelectronics |
11 / 20 page Industrial V/I Converter and Protector IC AM462 analog microelectronics December2006 Analog Microelectronics GmbH Phone: +49 (0)6131/91 073 - 0 11/20 An der Fahrt 13, D – 55124 Mainz Fax: +49 (0)6131/91 073 – 30 Rev. 2.4 Internet: http://www.analogmicro.de Email: info@analogmicro.de Using OP2 as a voltage reference In addition to the integrated voltage reference OP2 can also be used to supply voltage to external components, such as A/D converters and microprocessors, for example. Lower voltages can be generated (e.g. 3.3V) which with the increasing miniaturization of devices and need for ever lower levels of power dissipation in digital components is today of growing importance. The additional operational amplifier OP2 can easily be connected up as a voltage reference. Using the circuit in Figure 6 the following applies: + = + = 7 6 7 6 1 V 27 . 1 1 R R R R V V BG CVREF (9) Example : OP2 as voltage reference A voltage of VCVREF = 3.3V is to be set. Using Equation 9 the following ratio is calculated for external resistors R6 and R7: 6 , 1 1 6 , 2 1 7 6 = − ≈ − = BG CVREF V V R R The following example values are produced for the resistors: R7 = 10kΩ R6 = 16kΩ V BG AM462 OP2 1 OP2 connected as voltage reference 2 V CVREF R 6 R 7 µP Figure 6: Using OP2 as a voltage reference |
同様の部品番号 - AM462 |
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同様の説明 - AM462 |
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