AX5243 datasheet(32/65 Pages) ONSEMI

32 / 65 page

Circuit Description

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AX5243

Registers

Remarks

DECIMATION

This register programs the bandwidth of the digital channel filter.

RXDATARATE2… RXDATARATE0

These registers specify the receiver bit rate, relative to the channel filter

bandwidth.

MAXDROFFSET2…MAXDROFFSET0

These registers specify the maximum possible data rate offset.

MAXRFOFFSET2…MAXRFOFFSET0

These registers specify the maximum possible RF frequency offset.

TIMEGAIN,DRGAIN

These registers specify the aggressiveness of the receiver bit timing

recovery. More aggressive settings allow the receiver to synchronize with

shorter preambles, at the expense of more timing jitter and thus a

higher bit error rate at a given signal-to-noise ratio.

MODULATION

This register selects the modulation to be used by the transmitter and

the receiver, i.e. whether ASK, FSK should be used.

PHASEGAIN, FREQGAINA,

FREQGAINB, FREQGAINC,

FREQGAIND, AMPLGAIN

These registers control the bandwidth of the phase, frequency offset and

amplitude tracking loops.

AGCGAIN

This register controls the AGC (automatic gain control) loop slopes, and

thus the speed of gain adjustments. The faster the bit-rate, the faster

the AGC loop should be.

TXRATE

These registers control the bit rate of the transmitter.

FSKDEV

These registers control the frequency deviation of the transmitter in FSK

mode. The receiver does not explicitly need to know the frequency

deviation, only the channel filter bandwidth has to be set wide enough

for the complete modulation to pass.

AX5243 Datasheet(PDF) 32 Page - ON Semiconductor