Evaluation Board User Guide

UG-272

Rev. A | Page 7 of 12

RESET AND SWEEP

The reset software command is set using the button shown in

Figure 11. To set up a DDS sweep, click Sweep.

Figure 11. Software Reset and Sweep Select

The sweep function allows users to load a start frequency, stop

frequency, increment size, number of loops, and delay between

each frequency increment. These commands are then loaded to

the part automatically from the EVAL-SDP-CB1Z board.

Figure 12. Sweep Functionality

EXAMPLE OF OPERATION

An example of configuring the AD9833 to output 10 kHz follows:

1. Plug the EVAL-SDP-CB1Z board into the EVAL-

AD9833SDZ board and connect to the USB port.

2. Start up the software located at Start/All Programs/

Analog Devices/AD9833/AD9833 Eval Board. You should

see the SDP board communicating with the PC.

3. Select connectorA or connectorB; this must match what

the AD9837 test chip is connected to.

4. Define MCLK; the default is an on-board 25 MHz

oscillator.

5. Ensure that all links are in the correct locations (see Table 1).

6. Select the FREQ 1 register.

7. Load a 10 kHz excitation frequency and click Enter.

The output should appear on the IOUT and IOUTB outputs on

the evaluation board.

For the FREQ 0 register,

•

Select the FREQ 0 register.

•

Load the FREQ 0 register with 20 kHz and click Enter.

For the FREQ 1 register,

•

Select the FREQ 1 register to load the 10 kHz associated

with this register.

M20µs

A CH1

182mV

1

T

0s

CH1 FREQ

10kHz

CH1 p-p

596mV

Figure 13. 10 kHz Output Signals on an IOUT Test Point