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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD9927BBCZ датащи(PDF) 79 Page - Analog Devices |
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AD9927BBCZ датащи(HTML) 79 Page - Analog Devices |
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79 / 100 page  AD9927 Rev. 0 | Page 79 of 100 V-Driver Power Supply Sequencing When powering up the V-driver of the AD9927, it is important to pay attention to the order that the various V-driver power supplies are turned on. Particularly, a bias voltage of 2.3 V or greater must be applied to the V5V pin prior to powering up the VH and VL supplies. V5V is an internal voltage that eventually rises to ~5.4 V after VH and VL are powered up; therefore, it needs to be driven through a diode. A Schottky diode is recommended to maximize the bias voltage on V5V. To ensure proper operation, adhere to the following steps: 1. Connect VDD1 and VDD2 to a 3 V supply and keep V5V low. 2. Perform any necessary writes to Registers 0x25 and 0x26 (VT_STBY12 and VT_STBY3, respectively) to define the polarities of the V-driver outputs prior to powering up the VH and VL supplies. 3. Bring the signal driving the diode to V5V high. (Note that a GPO output can be used for this operation.) 4. After V5V reaches a minimum of 2.3 V, VH and VL can be powered on. There are no restrictions to the order in which VH and VL can be powered on at this time. 0V VDD VL V5V VH Figure 93. Suggested Power-Up Sequence for AD9927 V-Driver Supplies |
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