AX5043-QFN28-TU AXSEM, AX5043-QFN28-TU Datasheet - Page 32

• Manufacturer Part Number: AX5043-QFN28-TU
• Description: RF Transceiver Narrow-Band-IC
• Manufacturer: AXSEM

Specifications of AX5043-QFN28-TU

• Number Of Receivers: 1
• Number Of Transmitters: 1
• Wireless Frequency: 70 MHz to 1050 MHz
• Interface Type: SPI
• Output Power: 18 dBm to 22 dBm
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Maximum Supply Current: 60 mA
• Minimum Operating Temperature: - 40 C
• Modulation: ASK, FSK
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

32
Circuit Description
5.13. Modulator
Depending on the transmitter settings the modulator generates various inputs for the PA:
h
ASK
FSK
MSK
f
robustly.
PSK
OQPSK
compatibility to an existing system is required, MSK should be preferred.
All modulation schemes are binary.
Amplitude can be shaped using a raised cosine waveform.
Frequency shaping can either be hard (FSK, MSK), or Gaussian (GMSK, GFSK), with selectable
BT=0.3 or BT=0.5.
5.14. Automatic Frequency Control (AFC)
The
transmitter frequency within the RX-filter bandwidth. On top of that, the
tracking register
adjustment, the frequency offset can be computed with the following formula:
Version 0.2
deviation
Modulation
ASK
FSK/MSK/GFSK/GMSK "f=-f
PSK
AX5043
= 0.5#h#BIT-RATE,
= 0.25#BIT-RATE; the advantage of MSK over FSK is that it can be demodulated more
features an automatic frequency-tracking loop, which is capable of tracking the
= modulation index. It is the ratio of the deviation compared to the bit-rate; f
= amplitude shift keying
= frequency shift keying
= minimum shift keying; MSK is a special case of FSK, where h = 0.5, and therefore
= phase shift keying
= offset quadrature shift keying. The
TRKRFFREQ
Bit = 0
PA off
"$=0
AX5043
.
deviation
0
to synchronize the receiver frequency to a carrier signal. For AFC
can demodulate signals with h < 32.
Bit = 1
PA on
"f=+f
"$=180
Preliminary
deviation
0
Main Lobe
Bandwidth
BW=BIT-RATE
BW=(1+h) #BIT-RATE
BW=BIT-RATE
AX5043
supports OQPSK. However, unless
AX5043
Max. Bit-rate
75 kBit/s
75 kBit/s
75 kBit/s
Datasheet AX5043
has a frequency
deviation