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AD5171BRJ100-R2 датащи(PDF) 15 Page - Analog Devices |
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AD5171BRJ100-R2 датащи(HTML) 15 Page - Analog Devices |
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15 / 24 page ![]() AD5171 Rev. D | Page 15 of 24 TERMINAL VOLTAGE OPERATING RANGE POWER-UP/POWER-DOWN SEQUENCES There are also ESD protection diodes between VDD and the RDAC terminals; therefore, the VDD of the AD5171 defines their voltage boundary conditions (see Figure 31). Supply signals present on Terminal A, Terminal B, and Terminal W that exceed VDD are clamped by the internal forward-biased diodes and should be avoided. Similarly, because of the ESD protection diodes, it is important to power VDD first before applying any voltages to Terminal A, Terminal B, and Terminal W. Otherwise, the diode is forward- biased such that VDD is powered unintentionally and can affect the remainder of the users’ circuits. The ideal power-up sequence is the following order: GND, VDD, digital inputs, and VA/VB/VW. The order of powering VA, VB, VW, and the digital inputs is not important as long as they are powered after VDD. Similarly, VDD should be powered down last. GND A W B VDD Figure 31. Maximum Terminal Voltages Set by VDD |
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