UG-293
AD9643/AD9613/AD6649/AD6643 User Guide
Rev. A | Page 10 of 26
0
994
0-
0
13
Figure 13. SPI Controller,
AD6649
ADC A Tab—95 MHz FIR Filter and Fixed-Frequency NCO Mode
09
94
0-
0
14
Figure 14. SPI Controller, Example ADC A Tab—NSR Settings for the
AD6643
6.
If using the noise shaping requantizer (NSR) feature of
the
AD6643
, the settings in the
ADC A
and/or
ADC B
pages must be changed (see Figure 14). The
NSR Enable
checkbox must be selected under the
NOISE SHAPED
REQUANTIZER 1(3C)
section. This enables the circuitry
in the
AD6643
. To select the bandwidth mode, select 0 for
22% and 1 for 33% under the
NSR Mode
drop-down box
in the
NOISE SHAPED REQUANTIZER 1(3C)
section.
Upon selecting the bandwidth mode, select the desired
tuning word in the
NSR Tuning
drop-down box under the
NOISE SHAPED REQUANTIZER TUNING(3E)
section.
7.
Click the
Run
button in the
VisualAnalog
toolbar (see
Figure 15).
09940-
015
Figure 15. Run Button (Encircled in Red) in VisualAnalog Toolbar,
Collapsed Display
