UG-272 Datasheet, PDF (7/12 Pages) Analog Devices – Evaluation Board User Guide

Evaluation Board User Guide
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
UG-272
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.
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
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