SI4431-A0-FM Silicon Laboratories Inc, SI4431-A0-FM Datasheet - Page 34
![IC TXRX ISM 930MHZ 3.6V 20-QFN](/photos/14/23/142339/si4431-a0-fm_sml.jpg)
SI4431-A0-FM
Manufacturer Part Number
SI4431-A0-FM
Description
IC TXRX ISM 930MHZ 3.6V 20-QFN
Manufacturer
Silicon Laboratories Inc
Specifications of SI4431-A0-FM
Package / Case
20-QFN
Mfg Application Notes
Transitioning SI4430/31 to Rev B
Frequency
240MHz ~ 930MHz
Data Rate - Maximum
128kbps
Modulation Or Protocol
FSK, GFSK, OOK
Power - Output
13dBm
Sensitivity
-118dBm
Voltage - Supply
1.8 V ~ 3.6 V
Current - Receiving
18.5mA
Current - Transmitting
28mA
Data Interface
PCB, Surface Mount
Antenna Connector
PCB, Surface Mount
Operating Temperature
-40°C ~ 85°C
Number Of Receivers
2
Number Of Transmitters
1
Wireless Frequency
240 MHz to 930 MHz
Output Power
13 dBm
Operating Supply Voltage
1.8 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Maximum Supply Current
28 mA
Minimum Operating Temperature
- 40 C
Modulation
FSK, GFSK, OOK
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Applications
-
Memory Size
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Other names
336-1633-5
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
SI4431-A0-FMR
Manufacturer:
SILICON
Quantity:
3 500
Part Number:
SI4431-A0-FMR
Manufacturer:
SILICONLABS/芯科
Quantity:
20 000
Si4431
4. Modulation Options
4.1. Modulation Type
The Si4431 supports three different modulation options: Gaussian Frequency Shift Keying (GFSK), Frequency
Shift Keying (FSK), and On-Off Keying (OOK). GFSK is the recommended modulation type as it provides the best
performance and cleanest modulation spectrum. Figure 11 demonstrates the difference between FSK and GFSK
for a Data Rate of 64 kbps. The time domain plots demonstrate the effects of the Gaussian filtering. The frequency
domain plots demonstrate the spectral benefit of GFSK over FSK. The type of modulation is selected with the
modtyp[1:0] bits in "Register 71h. Modulation Mode Control 2". Note that it is also possible to obtain an
unmodulated carrier signal by setting modtyp[1:0] = 00.
34
TX Modulation Time Domain Waveforms -- FSK vs. GFSK
-0.5
-1.0
-1.5
-0.5
-1.0
1.5
1.0
0.5
0.0
1.0
0.5
0.0
0
50
100
modtyp[1:0]
150
200
00
01
10
11
time, usec
250
300
Figure 11. FSK vs GFSK Spectrums
GFSK (enable TX Data CLK when direct mode is used)
350
400
450
Preliminary Rev. 0.4
500
Unmodulated Carrier
Modulation Source
-100
-100
TX Modulation Spectrum -- FSK vs GFSK (Continuous PRBS)
-20
-40
-60
-80
-20
-40
-60
-80
-250
OOK
FSK
DataRate
-200
64000.0
-150
-100
TxDev
32000.0
-50
freq, KHz
0
BT_Filter
50
0.5
100
ModIndex
150
1.0
200
250