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AD9984APCBZ データシート(PDF) 41 Page - Analog Devices |
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AD9984APCBZ データシート(HTML) 41 Page - Analog Devices |
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41 / 44 page  AD9984A Rev. 0 | Page 41 of 44 DIGITAL INPUTS Digital inputs on the AD9984A (HSYNC0, HSYNC1, VSYNC0, VSYNC1, SOGIN0, SOGIN1, SDA, SCL, and CLAMP) are designed to work with 3.3 V signals, but are tolerant of 5 V signals. Therefore, no extra components need to be added if using 5 V logic. Any noise that gets onto the Hsync input trace adds jitter to the system. Therefore, minimize the trace length and do not run any digital or other high frequency traces near it. Reference Bypass The AD9984A has two reference voltages that must be bypassed for proper operation of the ADC. REFLO and REFHI are connected to each other through a 10 μF capacitor. These references are used by the ADC circuitry to assure the greatest stability. Place them as close to the AD9984A pin as possible. |
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