User Guide
UG-1283
Rev. A | Page 11 of 24
SPI Control, Enabling Receive, and Receive Mode
To operate in receive mode, take the following steps:
1.
Click the
T/R Control
tab (see Figure 17).
2.
Select the
RX EN
check box to enable the receive subcircuits
in SPI control. Note that the RX_EN bit is AND’ed together
with the receive enable bits in Register 0x2E such that the
receive paths and subcircuits do not enable until the
RX_EN bit is asserted high.
3.
Leave the
TR SPI
check box cleared to place the device in
receive mode.
4.
Click
Write Switch
.
Note that leaving the
TR SOURCE
check box cleared places the
device in SPI control mode, which is the default mode.
1
678
8-
21
7
Figure 17. SPI Control, Receive Enable, and Receive Mode
Receive Gain Control
To set Receive Channel 1 to maximum gain, take the following
steps:
1.
Click the
RX Registers
tab (see Figure 18).
2.
Select the
CH1 RX ATTN
check box to bypass the
attenuator on Channel 1.
3.
Set the
RX VGA CH1
value to 127 to set the VGA to
maximum gain on Channel 1.
4.
Click
Write Gain Values
.
16
78
8-
21
8
Figure 18. Setting Receive Channel 1 to Maximum Gain in Receive Gain
Control with All Other Channels at Minimum Gain
Receive Phase Control
To set Receive Channel 1 to 45°, take the following steps:
1.
Click the
RX Registers
tab (see Figure 19).
2.
Select the inphase (
I
) and quadrature phase (
Q
) check
boxes under
RX VM CH1 POL
to set the polarity bits so
that the vector is in the first quadrant.
3.
Set the
I
and
Q
values under
RX VM CH1 GAIN
to 22 for
a resulting vector of 45°.
4.
Click
Write Phase Values
.
16
788
-21
9
Figure 19. Setting Receive Channel 1 to Maximum Gain in Receive Phase
Control with All Other Channels at Minimum Gain
Receive Load
For the gain and phase changes to take effect, a load receive
override command must be given. To give this command, take
the following steps:
1.
Click the
MISC
tab (see Figure 20).
2.
In the
Over Ride
section, click
LDRX OVR
.
16
788
-22
0
Figure 20. Load Receive Override
CONTROL USING THE MANUAL REGISTER WRITE
GUI allows several registers of data to be
loaded quickly and efficiently in the
Load and Write
section
under the
Manual Register Write
tab. When the user becomes
familiar with the
, this method of writing to the
device saves a significant amount of time. The provided
maximum gain and switch bias settings .txt files can be used, or
the user can generate files containing user defined settings to
control the
