Figure 3-4. Nco Tab Controls; Table 3-2. Supported Interpolation Factors Vs Number Of Ducs Enabled - Texas Instruments DAC39RF10EVM User Manual

Evaluation module

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Table Of Contents

Table of Contents

Setup Procedure

Table 3-2. Supported Interpolation Factors vs Number of DUCs Enabled

Number of Streams

With the EVM gui open on the PC, navigate to NCO tab on upper left side of the GUI.

1. To set the NCO uncheck the DP Enable

2. Unchek the JESD Enable

3. Check the NCO Enable

4. In this example, JMODE was set to 1 and number of stream is set to 2. The interpolation factor is set to 2.

Supported Interpolation Factors vs Number of DUCs Enabled

have been grayed out. The data from DUC0 is routed to DAC0 and DAC1

5. Enter the Frequency in MHz

6. Check the JESD Enable

7. Check the DP Enable.

3.10.1 SPIDAC( NCO only) Operation

The DAC can also be configured in SPIDAC Operation (NCO only mode). In NCO only mode, data streamed

from JESD is ignored and DUCs inputs are driven by SPIDAC I and SPIDAC Q. This mode can be enabled

when JESD Enable is set to 0, interpolaton factor is greater than or equal to 2 and DP Enable is set to 1, the

DAC is configured in NCO only mode. Following

interpolation factor should be selected to enable the desired number of DUCs and setting the desired outputs

from respective DACs.

In the Example, all the four DUCs are enabled. DUC0 and DUC1 are routed to DAC0 and DUC2 and DUC3 are

routed to DAC1. If more than one DUC is routed per DAC, the DUC data into the DAC must be attenuated to

prevent the DAC from saturating.

DAC39RF10EVM Evaluation Module

Interpolation Factors

2-256x

4-256x

8-256x