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AD9174 Datasheet(PDF) 108 Page - Analog Devices |
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AD9174 Datasheet(HTML) 108 Page - Analog Devices |
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108 / 164 page  AD9174 Data Sheet Rev. A | Page 108 of 164 Addr. Name Bits Bit Name Settings Description Reset Access 0x12B DDSM_ACC_DELTA1 [7:0] DDSM_ACC_ DELTA[15:8] Sets DDSM_ACC_DELTA. If DDSM_ MODULUS_EN is high, main datapath NCO frequency = fDAC × (DDSM_FTW + DDSM_ ACC_DELTA/DDSM_ACC_MODULUS)/248. DDSM_ACC_DELTA must be > 0. DDSM_ ACC_DELTA must be > DDSM_ACC_ MODULUS. This control is paged by the MAINDAC_PAGE bits in Register 0x008. 0x0 R/W 0x12C DDSM_ACC_DELTA2 [7:0] DDSM_ACC_ DELTA[23:16] Sets DDSM_ACC_DELTA. If DDSM_ MODULUS_EN is high, main datapath NCO frequency = fDAC × (DDSM_FTW + DDSM_ ACC_DELTA/DDSM_ACC_MODULUS)/248. DDSM_ACC_DELTA must be > 0. DDSM_ ACC_DELTA must be > DDSM_ACC_ MODULUS. This control is paged by the MAINDAC_PAGE bits in Register 0x008. 0x0 R/W 0x12D DDSM_ACC_DELTA3 [7:0] DDSM_ACC_ DELTA[31:24] Sets DDSM_ACC_DELTA. If DDSM_ MODULUS_EN is high, main datapath NCO frequency = fDAC × (DDSM_FTW + DDSM_ ACC_DELTA/DDSM_ACC_MODULUS)/248. DDSM_ACC_DELTA must be > 0. DDSM_ ACC_DELTA must be > DDSM_ACC_ MODULUS. This control is paged by the MAINDAC_PAGE bits in Register 0x008. 0x0 R/W 0x12E DDSM_ACC_DELTA4 [7:0] DDSM_ACC_ DELTA[39:32] Sets DDSM_ACC_DELTA. If DDSM_ MODULUS_EN is high, main datapath NCO frequency = fDAC × (DDSM_FTW + DDSM_ ACC_DELTA/DDSM_ACC_MODULUS)/248. DDSM_ACC_DELTA must be > 0. DDSM_ ACC_DELTA must be > DDSM_ACC_ MODULUS. This control is paged by the MAINDAC_PAGE bits in Register 0x008. 0x0 R/W 0x12F DDSM_ACC_DELTA5 [7:0] DDSM_ACC_ DELTA[47:40] Sets DDSM_ACC_DELTA. If DDSM_ MODULUS_EN is high, main datapath NCO frequency = fDAC × (DDSM_FTW + DDSM_ ACC_DELTA/DDSM_ACC_MODULUS)/248. DDSM_ACC_DELTA must be > 0. DDSM_ ACC_DELTA must be > DDSM_ACC_ MODULUS. This control is paged by the MAINDAC_PAGE bits in Register 0x008. 0x0 R/W 0x130 DDSC_DATAPATH_ CFG 7 RESERVED Reserved. 0x0 R 6 DDSC_NCO_EN Channel datapath modulation enable. If the JESD204B mode chosen is a complex mode (channel interpolation >1×), this bit must be set to 1 for each channel datapath being used. If no modulation is desired, set the FTW to 0. This control is paged by the CHANNEL_PAGE bits in Register 0x008. 0x0 R/W 0 Disable channel NCO. 1 Enable channel NCO. [5:3] RESERVED Reserved. 0x0 R/W 2 DDSC_MODULUS_ EN Enable channel modulus DDS. This control is paged by the CHANNEL_PAGE bits in Register 0x008. 0x0 R/W 0 Disable modulus DDS. 1 Enable modulus DDS. |
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