Analog Devices EVAL-AD9959 User Manual page 11

User Guide
EVALUATION BOARD SOFTWARE
CHANNEL CONTROL
The Channel Control window provides control of the features
that affect the AD9959 at a channel-specific level. The following
describes the sections of the Channel Control window as they are
numerically indexed in Figure
1. Channel Select
Use the Channel Select tabs to select which specific channel
options to configure. The AD9959 has four independent channels:
Channel <0:3>. The default channel select tab setting is Channel 0.
2. Pwr Down
Use the Pwr Down section to power down the digital logic (check
Digital box) or the DAC circuitry (check DAC box). Upon default,
both of these boxes are unchecked, indicating that the digital logic
and the DAC circuitry of that channel are enabled (powered up).
3. Modulation Output Type
The Modulation Output Type box controls what type of modulation
is performed on the channel's output. Select Phase, Frequency,
Amplitude, or None (Single Tone) depending upon which type of
modulation you want. The level of modulation for the channel is
set using the Chip Level Control window under the Modulation
Configuration section in the Level box.
4. Linear Sweep Options
Use the Linear Sweep Options section to control the linear sweep
features. Select Enable Linear Sweep to turn on the linear sweep
function and the additional associated options (see
analog.com
1
2
3
4
Figure 21. Channel Control Window
21.
Figure 22).
5
6
7
8
Figure 22.
Select Linear Sweep No Dwell to enable this feature, see the
Linear Sweep No Dwell Mode section of the AD9959 data sheet for
more information regarding the no dwell feature.
When you select Load SRR @ I/O Update, the contents of the
sweep ramp rate register are loaded into the sweep ramp rate timer
every time an I/O_UPDATE is sent to the device.
The Clear Sweep Accumulator and Auto Clear Sweep Accumu-
lator have the same basic functionality as described in the
Channel Accumulator Control
window. The difference is that here the function is channel-specific.
See the Linear Sweep (Shaped) Modulation Mode section of the
AD9959 data sheet for a detailed explanation of this mode.
5. Pipe-Line Latency Control
When you check the Match Pipe Delays box in the Pipe Latency
Control section, the pipeline delay for updates to frequency, ampli-
tude, and phase will be equal, but only for the channels operating
in single tone mode. The default setting of this box is unchecked,
EVAL-AD9959
3. All
section of the Chip Level Control
Rev. A | 11 of 27