AD9173 datasheet(49/142 Pages) AD

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Data Sheet

AD9173

Rev. 0 | Page 49 of 142

This mode can also be used in applications where a sine wave is

all that is required, such as in a local oscillator application.

There is an additional optional calibration NCO block that can

be used as part of the initial system calibration without needing

to reprogram the final main datapath NCO to the final system

configuration. This feature is discussed in more detail in the

Calibration NCO section.

When the NCO test mode is enabled, the data source of the

digital datapath is the dc test data word, meaning that the

JESD204B link can be brought up and data can be transferred

to the device over the link, but the data is not presented to the

DAC when in this test mode. Connection to the SERDES data

source is only achieved by disabling this test mode. The SPI

control bit for this test mode can be set on the fly, but because

disabling the mode and switching to the SERDES datapath

normally requires the lanes and/or interpolation mode to also

be set, on the fly setting or resetting of the NCO only mode

control bit is normally not practical.

DAC

CORE

PA PROTECT

RAMP

UP/DOWN

GAIN

NCO

CALIBRATION

32-BIT NCO

REG 0x1E2 TO REG 0x1E5

MAIN 48-BIT

NCO

REG 0x114 TO REG 0x119

NCO

DDSC_EN_DC_INPUT

REG 0x130, BIT 0

NCO

DC AMPLITUDE LEVEL

(REG 0x148 TO REG 0x149)

CHANNEL

GAIN

CHANNEL

GAIN

CHANNEL

GAIN

DDSM_EN_CAL_DC_INPUT

REG 0x1E6, BIT 1

DDSM_EN_CAL_ACC

REG 0x1E6, BIT 2

DDSM_EN_CAL_FREQ_TUNING

REG 0x1E6, BIT 0

DDSC_EN_DC_INPUT

REG 0x130, BIT 0

DDSC_EN_DC_INPUT

REG 0x130, BIT 0

Figure 69. DC Amplitude Injection for NCO Only Mode Block Diagram

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