RF60 Datasheet, PDF (47/157 Pages) –

RF60 CRYSTAL-LESS SOC TRANSMITTER v1.0
12. Output Data Serializer (ODS)
12.1. Description
The ODS block is responsible for synchronizing the output data to the required data rate and maintaining a
steady data flow when data is available. The serializer accomplishes the following functions:
Controls the edge rate of the PA on/off transitions.
Schedules PA, DIVIDER, LCOSC on/off power transitions for minimal power consumption.
Controls the serial data rate.
Provides handshake interface and a 1 byte pipeline to allow a software process to maintain steady
dataflow.
Modulates a 7 bit “frequency deviation” bus to the LC oscillator to allow for FSK operation.
Provides test features to force on the power state of the LCOSC, DIVIDER, and PA; recirculating a fixed
pattern; forcing the FSK offset frequency.
The SFR and XREG settings of this block are determined from the desired modulation, data rate, and
encoding method and are automatically set by the ODS API in conjunction with the calculator. Users are
recommended to use the ODS API module functions for setting these registers.
12.2. Timing
P A _ L V L _ N S L IC E [4 :0 ]
LC _E N A
S Y M B O L T IM E
D IV _ E N A
LC _W A R M U P
P A _E N A
D IV _ W A R M U P
PA_W ARM UP
E D G E T IM E
Figure 12.1. OOK Timing Example
P A _ L V L_ N S L IC E [4:0]
LC _E N A
D IV _ E N A
PA_ENA
F S K _ S H IF T [6:0]
Figure 12.2. FSK Timing Example
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