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AX5243 데이터시트(PDF) 36 Page - ON Semiconductor

부품명 AX5243
상세설명  Advanced high performance ASK
PDF  65 Pages
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제조업체  ONSEMI [ON Semiconductor]
홈페이지  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

AX5243 데이터시트(HTML) 36 Page - ON Semiconductor

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Circuit Description
www.onsemi.com
AX5243
36
5.13. Modulator
Depending on the transmitter settings the modulator generates various inputs for the
PA:
Modulation
Bit = 0
Bit = 1
Main Lobe
Bandwidth
Max. Bitrate
ASK
PA off
PA on
BW=BITRATE
125 kBit/s
FSK/MSK/GFSK/GMSK f=-fdeviation
f=+fdeviation
BW=(1+h) BITRATE
125 kBit/s
PSK
=00
=1800
BW=BITRATE
125 kBit/s
h
= modulation index. It is the ratio of the deviation compared to the bit-
rate; fdeviation = 0.5hBITRATE, AX5243 can demodulate signals with h < 32.
ASK
= amplitude shift keying
FSK
= frequency shift keying
MSK
= minimum shift keying; MSK is a special case of FSK, where h = 0.5, and
therefore fdeviation = 0.25BITRATE; the advantage of MSK over FSK is that it can be
demodulated more robustly.
PSK
= phase shift keying
All modulation schemes, except 4-FSK, are binary.
Amplitude can be shaped using a raised cosine waveform. Amplitude shaping will also be
performed for constant amplitude modulation ((G)FSK, (G)MSK) for ramping up and
down the PA. Amplitude shaping should always be enabled.
Frequency shaping can either be hard (FSK, MSK), or Gaussian (GMSK, GFSK), with
selectable BT=0.3 or BT=0.5.
Modulation
DiBit = 00
DiBit = 01
DiBit = 11
DiBit = 10
Main Lobe
Bandwidth
Max. Bitrate
4-FSK
f=-3fdeviation
f=-fdeviation
f=+fdeviation f=+3fdeviation
BW=(1+3h)
BITRATE
115.2 kBit/s
4-FSK Frequency shaping is always hard.
5.14. Automatic Frequency Control (AFC)
The AX5243 features an automatic frequency tracking loop which is capable of tracking
the transmitter frequency within the RX filter band width. On top of that the AX5243
has a frequency tracking register
TRKRFFREQ to synchronize the receiver frequency to a



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