AD9175 datasheet(99/150 Pages) AD

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Data Sheet

AD9175

Rev. A | Page 99 of 150

Addr.

Name

Bits

Bit Name

Settings

Description

Reset

Access

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 Register 0x008.

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.

0x113

DDSM_FTW_

UPDATE

RESERVED

Reserved.

0x0

[6:4]

DDSM_FTW_REQ_

MODE

Frequency tuning word automatic update

mode. This control is paged by the

MAINDAC_PAGE bits in Register 0x008.

0x0

R/W

000

No automatic requests are generated when

the FTW registers are written.

001

Automatically generates a DDSM_FTW_

LOAD_REQ after DDSM_FTW Bits[7:0] are

written.

010

Automatically generates a DDSM_FTW_

LOAD_REQ after DDSM_FTW Bits[15:8] are

written.

011

Automatically generates a DDSM_FTW_

LOAD_REQ after DDSM_FTW Bits[23:16] are

written.

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