AX5051 Datasheet, PDF (23/44 Pages) ON Semiconductor – Advanced multi-channel single chip UHF transceiver

Circuit Description 23
Registers
Register
Bits
Purpose
PLLLOOP
FLT[1:0]
Synthesizer loop filter bandwidth, recommended usage is to increase the
bandwidth for faster settling time, bandwidth increases of factor 2 and 5 are
possible.
PLLCPI[2:0]
Synthesizer charge pump current, recommended usage is to decrease the
bandwidth (and improve the phase-noise) for low data-rate transmissions.
BANDSEL Switches between 868 MHz/915 MHz and 433 MHz bands
FREQ
Programming of the carrier frequency
IFFREQHI, IFFREQLO
Programming of the IF frequency
PLLRANGING
Initiate VCO auto-ranging and check results
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AX5051