AD9173 datasheet(70/144 Pages) AD

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Data Sheet

AD9173

START-UP SEQUENCE

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Rev. C | 70 of 144

Table 54. Channel Datapath Setup: Digital Gain and Channel NCOs

R/W

Bits

Value

Description

0b0 = upper sideband.

0b1 = lower sideband (spectral flip).

If dc test mode or NCO test mode is desired, set this bit to 1 to enable the test tone generation. Otherwise, set this bit to the

default value of 0.

Integer NCO mode calculation: DDSC_FTW = (fCARRIER/fNCO) × 248, where fNCO = fDATA/CH_INTERP_MODE.

0x132

[7:0]

Write DDSC_FTW[7:0].

0x133

[7:0]

Write DDSC_FTW[15:8].

0x134

[7:0]

Write DDSC_FTW[23:16].

0x135

[7:0]

Write DDSC_FTW[31:24].

0x136

[7:0]

Write DDSC_FTW[39:32].

0x137

[7:0]

Write DDSC_FTW[47:40].

0x138

[7:0]

Write DDSC_NCO_PHASE_OFFSET[7:0]. Calculation: DDSC_NCO_PHASE_OFFSET = (Degrees Offset/180) × 215.

0x139

[7:0]

Write DDSC_NCO_PHASE_OFFSET[15:8].

If using NCO modulus mode, also program modulus parameters. If not, skip this section. For modulus NCO mode: (fCARRIER/

fNCO) = (X + (A/B))/248 where DDSC_ACC_DELTA = A, DDSC_ACC_MODULUS = B, and DDSC_FTW = X.

0x13A

[7:0]

Write DDSC_ACC_MODULUS[7:0].

0x13B

[7:0]

Write DDSC_ACC_MODULUS[15:8].

0x13C

[7:0]

Write DDSC_ACC_MODULUS[23:16].

0x13D

[7:0]

Write DDSC_ACC_MODULUS[31:24].

0x13E

[7:0]

Write DDSC_ACC_MODULUS[39:32].

0x13F

[7:0]

Write DDSC_ACC_MODULUS[47:40].

0x140

[7:0]

Write DDSC_ACC_DELTA[7:0].

0x141

[7:0]

Write DDSC_ACC_DELTA[15:8].

0x142

[7:0]

Write DDSC_ACC_DELTA[23:16].

0x143

[7:0]

Write DDSC_ACC_DELTA[31:24].

0x144

[7:0]

Write DDSC_ACC_DELTA[39:32].

0x145

[7:0]

Write DDSC_ACC_DELTA[47:40].

0x131

0b1

Update all NCO phase and FTW words.

Table 55 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 55 can be skipped in the start-up sequence.

Table 55. 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].

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