Transmit And Receive Startup Using The Gui; Resetting The Registers, Changing To A 4-Wire Spi, And Setting The Ldo Voltage; Transmit Startup; Bypassing The Ram Section, Figure 7, Enabling Transmit Channels Section, And Figure 8; Renumbered Sequentially - Analog Devices ADAR1000-EVALZ User Manual

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TRANSMIT AND RECEIVE STARTUP USING THE GUI

The ADAR1000-EVALZ evaluation software can be used in one
of the following ways:

Operation of the graphical user interface (GUI) to control
the device settings and perform register writes. This
method includes all GUI tabs except for the Manual
Register Write tab and the ReadBack tab.

Use the Manual Register Write tab and the ReadBack tab
to write to a single register, read from a single register, or
write to multiple registers at once using a .txt file that
contains specific registers and data. This method is user
defined and created.
The following sections describe how to operate the ADAR1000-
EVALZ from power-on using the GUI or using .txt files for
quick writes to the necessary registers.
RESETTING THE REGISTERS, CHANGING TO A
4-WIRE SPI, AND SETTING THE LDO VOLTAGE
Perform a soft reset of the device before working with the
ADAR1000 to ensure that the device is in a known state. To
perform a soft reset, write 0x81 to Register 0x000. Next, write
0x18 to Register 0x000 to activate the SDO pin and place the
device in 4-wire SPI mode and read back from the device via the
SPI_MISO line. To write to the LDO regulator trim register to
trim the LDO regulator to approximately 1.8 V, write 0x55 to
Register 0x400.
These commands can only be given in the Manual Register
Write tab, either all at once in the Load and Write section or
individually in the Values to write section (see Figure 6).
Figure 6. Using the Load and Write Feature to Perform Several Writes
When all values are loaded via a .txt file or typed manually, click
Write All to write the data to the device.

TRANSMIT STARTUP

When powering up the device or after performing a soft reset,
the ADAR1000 sources the gain, phase, and bias data from the
on-chip random access memory (RAM), which is accessed via
Register Address 0x1000 through Register Address 0x1FFF.
When operating the device for the first time, use the control
registers (Register 0x0000 to Register 0x0FFF) to set the gain,
phase, and bias. The following procedures bypass the RAM,
enable transmit subcircuits, set SPI control (vs. TR pin control),
place the device in transmit mode, and set transmit Channel 1
to maximum gain and 45° phase.
Bypassing the RAM
To bypass the on-chip RAM and source the gain and phase data
from the configuration registers, take the following steps:
1. Click the MISC tab (see Figure 7).
2. Select the BEAM RAM BYPASS check box and the BIAS
RAM BYPASS check box.
3. Click Write Value.
Figure 7. Placing the Device in RAM Bypass Mode
Enabling Transmit Channels
To enable the transmit channels and associated circuits, take the
following steps:
1. Click the T/R Control tab (see Figure 8).
2. Select all check boxes in the Tx Enable section to enable all
four transmit channels and the corresponding subcircuits.
3. Click Write Enable Values.
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ADAR1000-EVALZ
Figure 8. Enabling Transmit Channels
User Guide