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AD7538AQ 数据表(PDF) 14 Page - Analog Devices |
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AD7538AQ 数据表(HTML) 14 Page - Analog Devices |
14 / 16 page AD7538 Rev. B | Page 14 of 16 DIGITAL FEEDTHROUGH The digital inputs to the AD7538 are directly connected to the microprocessor bus in the preceding interface configurations. These inputs are constantly changing even when the device is not selected. The high frequency logic activity on the bus can feed through the DAC package capacitance to show up as noise on the analog output. To minimize this digital feedthrough isolate the DAC from the noise source. Figure 13 shows an interface circuit, which uses this technique. All data inputs are latched from the bus by the CS signal. One may also use other means, such as peripheral interface devices, to reduce the digital feedthrough. D0 TO D15 WR A0 TO A15 CS LDAC WR DB0 TO DB13 MICRO- PROCESSOR SYSTEM AD75381 1LINEAR CIRCUITRY OMITTED FOR CLARITY. ADDRESS DECODE 16-BIT LATCH EN Figure 13. AD7538 Interface Circuit Using Latches to Minimize Digital Feedthrough |
类似零件编号 - AD7538AQ |
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类似说明 - AD7538AQ |
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