AD9174 datasheet(105/164 Pages) AD

105 / 164 page

Data Sheet

AD9174

Rev. A | Page 105 of 164

Addr.

Name

Bits

Bit Name

Settings

Description

Reset

Access

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.

100

Automatically generates a DDSM_FTW_

LOAD_REQ after DDSM_FTW Bits[31:24]

are written.

101

Automatically generate a DDSM_FTW_

LOAD_REQ after DDSM_FTW Bits[39:32] is

written.

110

Automatically generates a DDSM_FTW_

LOAD_REQ after DDSM_FTW Bits[47:40]

are written.

RESERVED

Reserved.

0x0

DDSM_FTW_

LOAD_SYSREF

Uses the next rising edge of SYSREF± to

trigger FTW load and reset. This bit also

loads the calibration tone FTW, as well as

the main NCO FTW on a rising edge

detection. This control is paged by the

MAINDAC_PAGE bits in Register 0x008.

0x0

R/W

DDSM_FTW_

LOAD_ACK

Frequency tuning word update acknow-

ledge. This bit reads back 1 if the FTW and

phase offset word is loaded properly. This

control is paged by the MAINDAC_PAGE bits

in Register 0x008.

0x0

FTW is not loaded.

FTW is loaded.

DDSM_FTW_

LOAD_REQ

Frequency tuning word update request

from the SPI. This bit also loads the calibra-

tion tone FTW, as well as the main NCO

FTW on a rising edge detection. This control

is paged by the MAINDAC_PAGE bits in

0x0

R/W

Clear DDSM_FTW_LOAD_ACK.

0 to 1 transition loads the FTW.

0x114

DDSM_FTW0

[7:0]

DDSM_FTW[7:0]

Sets the main datapath NCO FTW. If

DDSM_MODULUS_EN is low, the main

datapath NCO frequency = fDAC × (DDSM_

FTW/248). If DDSM_MODULUS_EN is high,

the main datapath NCO frequency = fDAC ×

(DDSM_FTW + DDSM_ACC_DELTA/DDSM_

ACC_MODULUS)/248. DDSM_ACC_DELTA

must be >0. DDSM_ACC_DELTA must be

>DDSM_ACC_MODULUS. This control is

paged by the MAINDAC_PAGE bits in

0x0

R/W

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