AD9174 datasheet(79/164 Pages) AD

79 / 164 page

Data Sheet

AD9174

Rev. A | Page 79 of 164

Table 57 lists optional registers to configure the main DAC datapaths if they are being configured for a specific application. If the main

DAC datapaths are bypassed (DP_INTERP_MODE = 1 for 1× channel interpolation), Table 57 can be skipped in the start-up sequence.

Table 57. Main DAC Datapath Setup: PA Protect and Main NCOs

R/W

Bits

Value

Description

0x008

[7:6]

MAINDAC_PAGE. Select the main DAC datapath to be programmed at the same time (or repeat this

block for each DAC datapath to independently program values). Bit x of this control corresponds to the

DAC x datapath.

0x112

Enable NCO for selected channels in paging Register 0x008.

0b0 = disable NCO.

0b1 = enable NCO.

Enable NCO modulus for selected channels in paging Register 0x008.

0b0 = disable NCO modulus.

0b1 = enable NCO modulus.

Select sideband from modulation result.

0b0 = upper sideband.

0b1 = lower sideband (spectral flip).

Set this bit to 0.

Integer NCO mode calculation: DDSM_FTW = (fCARRIER/fDAC) × 248.

0x114

[7:0]

Write DDSM_FTW[7:0].

0x115

[7:0]

Write DDSM_FTW[15:8].

0x116

[7:0]

Write DDSM_FTW[23:16].

0x117

[7:0]

Write DDSM_FTW[31:24].

0x118

[7:0]

Write DDSM_FTW[39:32].

0x119

[7:0]

Write DDSM_FTW[47:40].

0x11C

[7:0]

Write DDSM_NCO_PHASE_OFFSET[7:0]. Calculation: DDSM_NCO_PHASE_OFFSET = (degrees offset/180) ×

215.

0x11D

[7:0]

Write DDSM_NCO_PHASE_OFFSET[15:8].

If using NCO modulus mode, also program modulus parameters. If not, skip this section. For modulus

NCO mode: (fCARRIER/fDAC) = (X + (A/B))/248, where DDSM_ACC_DELTA = A, DDSM_ACC_MODULUS = B,

and DDSM_FTW = X.

0x124

[7:0]

Write DDSM_ACC_MODULUS[7:0].

0x125

[7:0]

Write DDSM_ACC_MODULUS[15:8].

0x126

[7:0]

Write DDSM_ACC_MODULUS[23:16].

0x127

[7:0]

Write DDSM_ACC_MODULUS[31:24].

0x128

[7:0]

Write DDSM_ACC_MODULUS[39:32].

0x129

[7:0]

Write DDSM_ACC_MODULUS[47:40].

0x12A

[7:0]

Write DDSM_ACC_DELTA[7:0].

0x12B

[7:0]

Write DDSM_ACC_DELTA[15:8].

0x12C

[7:0]

Write DDSM_ACC_DELTA[23:16].

0x12D

[7:0]

Write DDSM_ACC_DELTA[31:24].

0x12E

[7:0]

Write DDSM_ACC_DELTA[39:32].

0x12F

[7:0]

Write DDSM_ACC_DELTA[47:40].

0x113

0b1

Update all NCO phase and FTW words.

AD9174 Datasheet(PDF) 79 Page - Analog Devices

AD9174 Datasheet(HTML) 79 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL