AX8052F151 datasheet(38/51 Pages) ONSEMI

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Transceiver

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AX8052F151

Registers

Remarks

AX5051_CICDEC

This register programs the bandwidth of the digital channel filter.

AX5051_DATARATEHI,

AX5051_DATARATELO

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

filter bandwidth.

AX5051_TMGGAINHI, AX5051_TMGGAINLO

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.

AX5051_MODULATION

This register selects the modulation to be used by the transmitter

and the receiver, i.e. whether ASK, PSK , FSK, MSK or OQPSK

should be used.

AX5051_PHASEGAIN, AX5051_FREQGAIN,

AX5051_FREQGAIN2, AX5051_AMPLGAIN

These registers control the bandwidth of the phase, frequency

offset and amplitude tracking loops. Recommended settings are

provided in the AX5051 Programming Manual.

AX5051_AGCATTACK, AX5051_AGCDECAY

These registers control 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. Recommended settings

are provided in the AX5051 Programming Manual.

AX5051_TXRATE

These registers control the bit rate of the transmitter.

AX5051_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.

6.5. Encoder

The encoder is located between the Framing Unit, the Demodulator and the Modulator. It can

optionally transform the bit-stream in the following ways:

•

It can invert the bit stream.

•

It can perform differential encoding. This means that a zero is transmitted as no change in

the level, and a one is transmitted as a change in the level. Differential encoding is useful

for PSK, because PSK transmissions can be received either as transmitted or inverted, due

to the uncertainty of the initial phase. Differential encoding / decoding removes this

uncertainty.

•

It can perform Manchester encoding. Manchester encoding ensures that the modulation

has no DC content and enough transitions (changes from 0 to 1 and from 1 to 0) for the

demodulator bit timing recovery to function correctly, but does so at a doubling of the data

rate.

•

It can perform Spectral Shaping. Spectral Shaping removes DC content of the bit stream,

ensures transitions for the demodulator bit timing recovery, and makes sure that the

transmitted spectrum does not have discrete lines even if the transmitted data is cyclic. It

does so without adding additional bits, i.e. without changing the data rate. Spectral

Shaping uses a self synchronizing feedback shift register.

AX8052F151 Datasheet(PDF) 38 Page - ON Semiconductor

AX8052F151 Datasheet(HTML) 38 Page - ON Semiconductor

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