SI4020-I1-FT Silicon Laboratories Inc, SI4020-I1-FT Datasheet - Page 11

• Manufacturer Part Number: SI4020-I1-FT
• Description: IC TX FSK 915MHZ 5.4V 16-TSSOP
• Manufacturer: Silicon Laboratories Inc

Specifications of SI4020-I1-FT

• Package / Case: 16-TSSOP
• Frequency: 315MHz, 433MHz, 868MHz, and 915MHz
• Modulation Or Protocol: FSK, OOK
• Data Rate - Maximum: 256 kbps
• Current - Transmitting: 14mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2.2 V ~ 5.4 V
• Operating Temperature: -40°C ~ 85°C
• Operating Frequency: 315 MHz to 915 MHz
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 2.2 V to 5.4 V
• Supply Current: 1.5 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Power - Output: -
• Applications: -
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1621-5

Modulated RF Spectrum
The antenna tuning characteristics was recorded in “max-hold” state of the spectrum analyzer. During the measurement, the
transmitters were forced to change frequencies by forcing an external reference signal to the XTL pin. While the carrier was changing
the antenna tuning circuit switched trough all the available states of the tuning circuit. The graph clearly demonstrates that while the
complete output circuit had about a 40 MHz bandwidth, the tuning allows operating in a 220 MHz band. In other words the tuning
circuit can compensate for 25% variation in the resonant frequency due to any process or manufacturing spread.
Ref -10 dBm
#Peak
Log
10
dB/
VAvg
100
W1S2
S3 FC
Center 434 MHz
Res BW 10 kHz
Ref 0 dBm
#Peak
Log
10
dB/
W1S2
S3 FC
Center 434.8 MHz
#Res BW 3 kHz
With 10 MHz CLK Output Enabled at 433 MHz
AA
AA
Marker ∆
20.000000 MHz
-55.11 dB
15:46:09 Oct 29, 2003
16:29:03 Jun 17, 2003
180 kHz Deviation at 64 kbps
Spurious RF Spectrum
At 433 MHz with
Atten 10 dB
Atten 5 dB
VBW 100 kHz
#VBW 300 Hz
p
1R
Sweep 20.07 ms (2001 pts)
Sweep 45.47 s (401 pts)
Mkr1 ∆ 20.0 MHz
Span 50 MHz
Span 2 MHz
-55.11 dB
1
Ref -10 dBm
#Peak
Log
10
dB/
VAvg
100
W1S2
S3 FC
Center 868 MHz
Res BW 10 kHz
Ref -36 dBm
Peak
Log
1
dB/
V1 M2
S3 FC
Start 700 MHz
#Res BW 1 MHz
AA
AA
Marker
915.000000 MHz
-37.62 dBm
15:43:45 Oct 29, 2003
16:54:54 Mar 11, 2003
Antenna Tuning Characteristics
180 kHz Deviation at 64 kbps
#Atten 0 dB
Atten 5 dB
At 868 MHz with
750–970 MHz
VBW 100 kHz
VBW 1 MHz
1
Sweep 20.07 ms (2001 pts)
Sweep 50 ms (401 pts)
Mkr1 915.0 MHz
Stop 1.05 GHz
Si4020
-37.62 dBm
Span 2 MHz
*
11