AD9173 datasheet(96/144 Pages) AD

96 / 144 page

Data Sheet

AD9173

analog.com

Rev. C | 96 of 144

Table 60. Register Details

Addr.

Name

Bits

Bit Name

Settings

Description

Reset

Access

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 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

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 Register 0x008.

0x0

R/W

0x115

DDSM_FTW1

[7:0]

DDSM_FTW[15:8]

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 Register 0x008.

0x0

R/W

0x116

DDSM_FTW2

[7:0]

DDSM_FTW[23:16]

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

0x0

R/W

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