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ADC12J1600 Datasheet(PDF) 80 Page - Texas Instruments |
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ADC12J1600 Datasheet(HTML) 80 Page - Texas Instruments |
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80 / 98 page  ADC12J1600, ADC12J2700 SLAS969C – JANUARY 2014 – REVISED JULY 2015 www.ti.com 7.6.1.7.13 NCO Frequency (Preset x) Register (address = see Table 71) [reset = see Table 71] Figure 106. NCO Frequency (Preset x) Register (NCO_FREQ_x) 31 30 29 28 27 26 25 24 NCO_FREQ_x R/W-0xC0h 23 22 21 20 19 18 17 16 NCO_FREQ_x R/W-0x00h 15 14 13 12 11 10 9 8 NCO_FREQ_x R/W-0x00h 7 6 5 4 3 2 1 0 NCO_FREQ_x R/W-0x00h Table 84. NCO_FREQ_x Field Descriptions Bit Field Type Reset Description 31-0 NCO_FREQ_x R/W 0xC00000 Changing this register after the JESD204B interface is running 00h results in non-deterministic NCO phase. If deterministic phase is required, the JESD204B interface must be re-initialized after changing this register. The NCO frequency (ƒ(NCO)) is: ƒ(NCO) = NCO_FREQ_x × 2 –32 × ƒ S where • ƒS is the sampling frequency of the ADC • NCO_FREQ_x is the integer value of this register (12) This register can be interpreted as signed or unsigned. Use this equation to determine the value to program: NCO_FREQ_x = 2 32 × ƒ (NCO) / ƒS (13) If the equation does not result in an integer value, you must choose an alternate frequency step (ƒ(STEP) ) and program the NCO_RDIV register. Then use one of the following equations to compute NCO_FREQ_x: NCO_FREQ_x = round(2 32 × ƒ (NCO) / ƒS) (14) NCO_FREQ_x = round(2 25 × ƒ (NCO) / ƒ(STEP) / NCO_RDIV) (15) 80 Submit Documentation Feedback Copyright © 2014–2015, Texas Instruments Incorporated Product Folder Links: ADC12J1600 ADC12J2700 |
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