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AM400 Scheda tecnica(PDF) 10 Page - Analog Devices |
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AM400 Scheda tecnica(HTML) 10 Page - Analog Devices |
10 / 21 page UNIVERSAL AMPLIFIER IC AM400 analog microelectronics October 2005 Analog Microelectronics GmbH Phone: +49 (0)6131/91 073 – 0 10/21 An der Fahrt 13, D – 55124 Mainz Fax: +49 (0)6131/91 073 – 30 Rev.: 4.2 Internet: http://www.analogmicro.de Email: info@analogmicro.de OPERATING AM400 General information on 2- and 3-wire applications In 3-wire operation (cf. Figure 5, for example) the ground of the IC (pin GND) is connected up to the external mass of the system Ground. The system's supply voltage VS is connected to pin VCC and pin VCC to pin RS+. In 2-wire operation (cf. Figure 7) system supply voltage VS is connected to pin RS+ and pin VCC to RS-. The ground of the IC (pin GND) is connected to the node between resistor R5 and load resistor RL (current output IOUT). IC ground (GND) is not the same as system ground (Ground)!! The output signal is picked up via load resistor RL which connects current output IOUT to the system ground. In 2-wire operation the IC ground is "virtual" (floating), as with a constant load resistance the supply voltage of the device VCC changes according to the current. As a rule, the following equation applies to 2-wire operation: () L IN OUT S CC R V I V V − = (5) The reason for this is that in 2-wire operation the IC is connected in series to the actual load resistor RL. This is illustrated in Figure 3. In 3-wire operation Equation 5 no longer applies as the IC ground is connected to the ground of the system. For 3-wire operation the supply voltage can be expressed thus: S CC V V = (6) In a 2-wire setup the power consumption of the overall system (AM400 and all external components including the adjusting resistors) may not exceed IOUTmin (usually 4mA). R L V S 2-wire system Signal source and conditioning IC GND Ground ≠ V CC ≠ VS Ground R L 3-wire system Signal source and conditioning IC GND Ground = V CC = VS Ground GND = GND V CC I OUT I OUT VV CC S = Figure 3: The difference between 2- and 3-wire operation |
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