Control Using The Manual Register Write; And Figure 20 - Analog Devices ADAR1000-EVALZ User Manual

ADAR1000-EVALZ
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' e d 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.
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.
Figure 18. Setting Receive Channel 1 to Maximum Gain in Receive Gain
Control with All Other Channels at Minimum Gain
User Guide
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.
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.

CONTROL USING THE MANUAL REGISTER WRITE

The ADAR1000
loaded quickly and efficiently in the Load and Write section
under the Manual Register Write tab. When the user becomes
familiar with the ADAR1000, 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 ADAR1000.
Rev. A | Page 11 of 24
Figure 20. Load Receive Override
GUI allows several registers of data to be
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