PR
EL
IMI
NA
RY
SW71122
MLX71122 RF Receiver
Programming Software Manual
39011 71122 01
Page 11 of 21
SW71122-Manual
Rev. 004
Aug/11
5
Description of the Control Tabs
The user can select five tabs for different control settings of the SPI-mode.
5.1 Mode Control – Tab
The Mode Control tab displays all dialog fields that are used to change the operating modes of the circuit. On
top are the controls for the
Operation Mode
and the mode of the
Multi Functional Output
(MFO).
5.1.1
Operation Mode
Selections are:
•
Shutdown
all blocks deactivated, only SPI active (default)
•
Receive
receiving data from LNAI at selected frequency
•
RO and bias only
only biasing system and reference oscillator are working
•
Synthesizer only
only biasing system, reference oscillator and PLL are working
The first operation mode consumes virtually no current. The circuit is dead except of the SPI that can listen to
commands. In Receive mode all necessary blocks are turned on to receive data at the programmed
frequency.
The last two operation modes can be used to accelerate the start-up of the circuit after periods of silence.
With
RO and biasing only
, the long start-up time of the reference oscillator (RO) can be circumvented. RO
and biasing consume not as much current as the whole receiver. With
Synthesizer only
the full PLL is
already working and locked in. Current consuming blocks as the LNA, the IF-filter and the FSK-demodulator
are turned off in this state. The last mode is useful if the receiver has to listen in short periods.
