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AD5112 Datasheet(PDF) 26 Page - Analog Devices |
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AD5112 Datasheet(HTML) 26 Page - Analog Devices |
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26 / 28 page  AD5110/AD5112/AD5114 Data Sheet Rev. 0 | Page 26 of 28 TERMINAL VOLTAGE OPERATING RANGE The AD5110/AD5112/AD5114 are designed with internal ESD diodes for protection. These diodes also set the voltage boundary of the terminal operating voltages. Positive signals present on Terminal A, Terminal B, or Terminal W that exceed VDD are clamped by the forward-biased diode. There is no polarity constraint between VA, VW, and VB, but they cannot be higher than VDD or lower than GND. GND VDD A W B Figure 49. Maximum Terminal Voltages Set by VDD and GND POWER-UP SEQUENCE Because there are diodes to limit the voltage compliance at Terminal A, Terminal B, and Terminal W (Figure 49), it is important to power VDD first before applying any voltage to Terminal A, Terminal B, and Terminal W. Otherwise, the diode is forward-biased such that VDD is powered unintentionally. The ideal power-up sequence is GND, VDD, VLOGIC, digital inputs, and VA, VB, and VW. The order of powering VA, VB, VW, and digital inputs is not important as long as they are powered after VDD and VLOGIC. Regardless of the power-up sequence and the ramp rates of the power supplies, once VLOGIC is powered, the power-on preset activates, which restores EEPROM values to the RDAC registers. LAYOUT AND POWER SUPPLY BIASING It is always a good practice to use compact, minimum lead length layout design. The leads to the input should be as direct as possible with a minimum conductor length. Ground paths should have low resistance and low inductance. It is also good practice to bypass the power supplies with quality capacitors. Low equivalent series resistance (ESR) 1 μF to 10 μF tantalum or electrolytic capacitors should be applied at the supplies to minimize any transient disturbance and to filter low frequency ripple. Figure 50 illustrates the basic supply bypassing configuration for the AD5110/AD5112/AD5114. VDD VLOGIC VDD + GND C1 0.1µF C2 10µF VLOGIC + C3 0.1µF C4 10µF AD5110/ AD5112/ AD5114 Figure 50. Power Supply Bypassing |
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