AD9174 datasheet(109/164 Pages) AD

109 / 164 page

Data Sheet

AD9174

Rev. A | Page 109 of 164

Addr.

Name

Bits

Bit Name

Settings

Description

Reset

Access

DDSC_SEL_

SIDEBAND

Selects upper or lower sideband from

modulation result. This control is paged by

the CHANNEL_PAGE bits in Register 0x008.

0x0

R/W

Use upper sideband.

Use lower sideband = spectral flip.

DDSC_EN_DC_

INPUT

Enable test tone generation by sending dc

to input level to channel DDS. Set the

amplitude in the DC_TEST_INPUT_

AMPLITUDE control (Register 0x148 and

the CHANNEL_PAGE bits in Register 0x008.

0x0

R/W

Disable test tone generation.

Enable test tone generation.

0x131

DDSC_FTW_UPDATE

[7:3]

RESERVED

Reserved.

0x0

DDSC_FTW_

LOAD_SYSREF

Use next rising edge of SYSREF± to trigger

FTW load and reset. This control is paged by

the CHANNEL_PAGE bits in Register 0x008.

0x0

R/W

DDSC_FTW_

LOAD_ACK

Frequency tuning word update acknow-

ledge bit. This bit reads back 1 if the FTW

and phase offset word is loaded properly.

This control is paged by the CHANNEL_

PAGE bits in Register 0x008.

0x0

FTW is not loaded.

FTW is loaded.

DDSC_FTW_

LOAD_REQ

Frequency tuning word update request

from the SPI. This control is paged by the

CHANNEL_PAGE bits in Register 0x008.

0x0

R/W

No FTW update.

0 to 1 transition loads the FTW.

0x132

DDSC_FTW0

[7:0]

DDSC_FTW[7:0]

Sets the channel datapath NCO FTW. If

DDSC_MODULUS_EN is low, the main

datapath NCO frequency = fDAC × (DDSC_

FTW/248). If DDSC_MODULUS_EN is high,

main datapath NCO frequency = fDAC ×

(DDSC_FTW + DDSC_ACC_DELTA/DDSC_

ACC_MODULUS)/248. DDSC_ACC_DELTA

must be > 0. DDSC_ACC_DELTA must be >

DDSC_ACC_MODULUS. This control is

paged by the CHANNEL_PAGE bits in

0x0

R/W

0x133

DDSC_FTW1

[7:0]

DDSC_FTW[15:8]

Sets the channel datapath NCO FTW. If

DDSC_MODULUS_EN is low, the main

datapath NCO frequency = fDAC × (DDSC_

FTW/248). If DDSC_MODULUS_EN is high,

main datapath NCO frequency = fDAC ×

(DDSC_FTW + DDSC_ACC_DELTA/DDSC_

ACC_MODULUS)/248. DDSC_ACC_DELTA

must be > 0. DDSC_ACC_DELTA must be >

DDSC_ACC_MODULUS. This control is

paged by the CHANNEL_PAGE bits in

0x0

R/W

AD9174 Datasheet(PDF) 109 Page - Analog Devices

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