Evaluation Board User Guide
RESET AND SWEEP
The reset software command is set using the button shown in
UG-272
EXAMPLE OF OPERATION
An example of configuring the AD9833 to output 10 kHz follows:
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.
1.
2.
3.
4.
5.
6.
7.
Plug the EVAL-SDP-CB1Z board into the EVAL-
AD9833SDZ board and connect to the USB port.
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.
Select connectorA or connectorB ; this must match what
the AD9837 test chip is connected to.
Define MCLK; the default is an on-board 25 MHz
oscillator.
Ensure that all links are in the correct locations (see Table 1).
Select the FREQ 1 register.
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.
Figure 12. Sweep Functionality
CH1 FREQ
10kHz
CH1 p-p
596mV
1
CH1 100mV
M20μs
T
0s
A CH1
182mV
Figure 13. 10 kHz Output Signals on an IOUT Test Point
Rev. A | Page 7 of 12
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