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AD9142ABCPZ 数据表(PDF) 29 Page - Analog Devices |
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AD9142ABCPZ 数据表(HTML) 29 Page - Analog Devices |
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29 / 73 page  AD9142A Data Sheet Interface Timing Requirements The following example shows how to calculate the optimal delay at the data source to achieve the best sampling timing in the delay line interface mode: • fDCI = 200 MHz • Delay setting = 0 The shadow area in Figure 38 is the interface setup and hold time window set to 0. To optimize the interface timing, this window must be placed in the middle of the data transitions. Because the input is double data rate, the available data period is 2.5 ns. Therefore, the optimal data bus delay, with respect to the DCI at the data source, can be calculated as ns 13 . 0 25 . 1 38 . 1 2 2 |) | | (| = − = − + = PERIOD DATA H S DELAY t t t t SPI Sequence to Enable Delay Line Interface Mode Use the following SPI sequence to enable the delay line interface mode: 1. 0x5E → 0x00 /* Configure the delay setting */ 2. 0x5F → 0x60 3. 0x0D → 0x16 /* DC couple DCI */ 4. 0x0A → 0x00 /* Turn off DLL and duty cycle correction */ Rev. A | Page 28 of 72 |
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