LMS7002M Quick Starter Manual for EVB7 kit
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P a g e
Version: 2.2
Last modified: 29/09/2014
SXT/SXR
7.14
This tab controls the SXT and SXR modules. The table in this chapter describes the control registers of
SXT and SXR modules.
Figure 39 GUI SXT/SXR tab
Most of the SXT/SXR registers are preset to for normal (FDD) operation. To configure Tx/Rx
LO to wanted frequency, do the following:
1.
Select the
A/SXR
(receiver PLL)
or
B/SXT
(transmitter PLL)
in configuration channels
window accordingly which PLL frequency you want to control.
2.
Enable
VCO
(deselect).
3.
Set
Scales VCO bias current
to 255.
4.
Type the wanted frequency in
Frequency, GHz
box. In this case 1950MHz.
5.
Press
Calculate
followed by
Tune
.
A picture of the tab is shown in
. A description of each function available in this tab is
shown below in Table 16.
Table 16 GUI SXT/SXR control description
Parameter
Description
Division ration
Trim duty cycle of DIV2
LOCH
Trims the duty cycle of DIV2 LOCH. Only works when forward divider is dividing
by at least 2 (excluding quadrature block division). If in bypass mode, this does not
work. By default set to 3.
Trim duty cycle of DIV4
LOCH
Trims the duty cycle of DIV4 LOCH. Only works when forward divider is dividing
by at least 4 (excluding quadrature block division). If in bypass mode, this does not
work. By default set to 3.
LOCH_DIV
division Controls the division ratio in the LOCH_DIV. By default set to 2.
