AD9174 datasheet(104/164 Pages) AD

104 / 164 page

AD9174

Data Sheet

Rev. A | Page 104 of 164

Addr.

Name

Bits

Bit Name

Settings

Description

Reset

Access

0x112

DDSM_DATAPATH_

CFG

RESERVED

Reserved.

0x0

EN_CMPLX_MOD

Modulator switch mode selection. This

control allows modifying Configuration 3 of

the modulator switch to allow complex (I/Q)

data from each NCO to pass to DACx. This

function depends on the settings applied to

Bits[5:4] in this register, Register 0x112. When

this bit is set high, Bits[5:4] of this register are

set to 0b11 (Modulator Switch Configuration

3). This control is paged by the MAINDAC_

PAGE bits in Register 0x008.

Switch configuration is as defined by

Bits[5:4].

With Bits[5:4] = 0b11 and the DAC1 main

NCO enabled, DAC0 = I0_NCO + I1_NCO,

DAC1 = Q0_NCO + Q1_NCO. With Bits[5:4] =

0b11 and the DAC1 main NCO disabled,

DAC0 = I0_NCO, DAC1 = Q0_NCO.

[5:4]

DDSM_MODE

Modulator switch mode selection. This

control chooses the mode of operation for

the main datapath NCO being configured.

This control is paged by the MAINDAC_

PAGE bits in Register 0x008.

0x0

R/W

DAC0 = I0; DAC1 = I1.

DAC0 = I0 + I1; DAC1 = Q0 + Q1.

DAC0 = I0; DAC1 = Q0.

DAC0 = I0 + I1; DAC1 = 0.

DDSM_NCO_EN

Main datapath modulation enable. If the

JESD204B mode chosen is a complex

mode (main datapath interpolation >1×),

this bit must be set to 1 for each main

datapath being used. If no modulation is

desired, set the FTW to be 0. This control is

paged by the MAINDAC_PAGE bits in

0x0

R/W

Disable main datapath NCO.

Enable main datapath NCO.

DDSM_

MODULUS_EN

Enable main datapath modulus DDS. This

control is paged by the MAINDAC_PAGE

bits in Register 0x008.

0x0

R/W

Disable modulus DDS.

Enable modulus DDS.

DDSM_SEL_

SIDEBAND

Selects upper or lower sideband from

modulation result. This control is paged by

the MAINDAC_PAGE bits in Register 0x008.

0x0

R/W

Use upper sideband.

Use lower sideband = spectral flip.

EN_SYNC_ALL_

CHNL_NCO_RESETS

Selects the signal channel NCOS used for

resets and FTW updates. This control is

paged by the MAINDAC_PAGE bits in

0x1

R/W

Channel NCOs reset or update their FTW

based on channel NCO update requests.

Channel NCOs reset or update their FTW

based on main datapath NCO update

requests.

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