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AD5290 bảng dữ liệu(PDF) 10 Page - Analog Devices |
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AD5290 bảng dữ liệu(HTML) 10 Page - Analog Devices |
10 / 11 page Preliminary Technical Data AD5290 Rev. Pr C | Page 10 of 11 VA/B/W. The relative order of powering VA, VB, VW, and the digital inputs is not important as long as they are powered after VDD and VSS with respect to GND. LAYOUT AND POWER SUPPLY BYPASSING It is a good practice to employ compact, minimum lead length layout design. The leads to the inputs should be as direct as possible with a minimum conductor length. Ground paths should have low resistance and low inductance. Similarly, it is also a good practice to bypass the power supplies with quality capacitors for optimum stability. Supply leads to the device should be bypassed with disc or chip ceramic capacitors of 0.01 µF to 0.1 µF. Low ESR 1 µF to 10 µF tantalum or electrolytic capacitors should also be applied at the supplies to minimize any transient disturbance and low frequency ripple (see Figure 4). Note that the digital ground should also be joined remotely to the analog ground at one point to minimize the ground bounce. Figure 4. Power Supply Bypassing DAISY CHAIN OPERATION The serial data output pin (SDO) can be used to daisy chain multiple devices for simultaneous operations, see Figure 12. The SDO pin contains an open drain N-Ch FET and requires a pull- up resistor. Users need to tie the SDO pin of one package to the SDI pin of the next package. If many devices are daisy-chained, users may need to increase the clock period to accommodate the time delay introduced by the pull-up resistors and the capacitive loading at the SDO-SDI interface, see Figure 12. If two AD5290 are daisy chained, this requires total 16 bits of data. The first 8 bits goes to U2 and the second 8 bits goes to U1. The CS should be kept low until all 16 bits are clocked into their respective serial registers. The CS is then pulled high to complete the operation. Figure 12. Daisy Chain Configuration AD5290 SDI SDO CS CL K AD5290 SDI SDO CS CL K 2.2K Ω Rp VDD U1 U2 S CLK MO SI S S m uC AD5290 |
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Mô tả tương tự - AD5290 |
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