AX5131-TSSOP20-TU AXSEM, AX5131-TSSOP20-TU Datasheet - Page 23

• Manufacturer Part Number: AX5131-TSSOP20-TU
• Description: RF Transmitter TSSOP-Class-IC
• Manufacturer: AXSEM
• Type: Single Chip Transceiverr

Specifications of AX5131-TSSOP20-TU

• Package / Case: TSSOP-20
• Operating Frequency: 400 MHz to 940 MHz
• Maximum Operating Temperature: + 60 C
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 2.2 V to 3.6 V
• Supply Current: 100 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.9.
Depending on the transmitter settings the modulator generates various inputs for the PA:
h
f
ASK
FSK
MSK
therefore f
demodulated more robustly.
PSK
OQPSK
compatibility to an existing system is required, MSK should be preferred.
4-FSK
symbol
All modulation schemes are binary.
Version 1.0
deviation
Modulation
4-FSK
Modulation
ASK
FSK / MSK
/GFSK
PSK
= 0.5⋅h⋅BITRATE.
Modulator
deviation
= modulation index. It is the ratio of the deviation compared to the bit-rate;
= amplitude shift keying
= frequency shift keying
= minimum shift keying; MSK is a special case of FSK, where h = 0.5, and
= phase shift keying
= offset quadrature shift keying. The
= four frequencies are used to transmit two bits simultaneously during each
Symbol = 00
∆f = -3⋅f
= 0.25⋅BITRATE; the advantage of MSK over FSK is that it can be
Bit = 0
PA off
∆f = -f
∆Φ = 0
deviation
deviation
0
Symbol = 01
∆f = -f
PA on
deviation
Bit = 1
∆f = +f
∆Φ = 180
deviation
0
Symbol = 10
∆f = +f
Main Lobe Bandwidth
BW = BITRATE
BW = (1+h) ⋅BITRATE
BW = BITRATE
deviation
AX5131
Symbol = 11
∆f = +3⋅f
supports OQPSK. However, unless
deviation
Max. Bitrate
2000 kBit/s
200 kBit/s
2000 kBit/s
Max. Bitrate
400 kBit/s
Circuit Description
Datasheet AX5131
23