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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DAC5687IPZP датащи(PDF) 39 Page - Texas Instruments |
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DAC5687IPZP датащи(HTML) 39 Page - Texas Instruments |
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39 / 79 page  www.ti.com Σ Q(t) I(t) 11 11 10 qmc_gain_a/210 {0, 1/210, ..., 2 – 1/210} X X X qmc_phase/210 {–1/2, –1/2 + 1/210, ..., 1/2 – 1/210} qmc_gain_b/210 {0, 1/210, ..., 2 – 1/210} B0164−01 L- O L- O side- band side- band Uncorrected Corrected C003 DAC Offset Control DAC5687 SLWS164E – FEBRUARY 2005 – REVISED SEPTEMBER 2006 Figure 40. QMC Block Diagram Figure 41. Example of Sideband Optimization Using QMC Phase and Gain Adjustments Registers daca_offset and dacb_offset control the I and Q path offsets and are 13-bit values with a range of –4096 to 4095. The DAC offset value adds a digital offset to the digital data before digital-to-analog conversion. The qmc_gain_a and qmc_gain_b registers can be used to back off the signal before the offset to prevent saturation when the offset value is added to the digital signal. The offset values are in 2s-complement format. It takes four DAC clock cycles to update the 14-bit DAC5687 offset registers. During the first clock cycle, the two MSBs, daca_offset(13:12) and dacb_offset(13:12), are updated, followed by daca_offset(11:8) and dacb_offset(11:8) on the second clock cycle, daca_offset(7:4) and dacb_offset(7:4) on the third clock cycle, and daca_offset(3:0) and dacb_offset(3:0) on the fourth clock cycle. Copyright © 2005–2006, Texas Instruments Incorporated Submit Documentation Feedback 39 Product Folder Link(s): DAC5687 |
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