4021-DKDB14 Silicon Laboratories Inc, 4021-DKDB14 Datasheet - Page 11

• Manufacturer Part Number: 4021-DKDB14
• Description: KIT DEV TEST EZRADIO SI4021 TX
• Manufacturer: Silicon Laboratories Inc

Specifications of 4021-DKDB14

• Accessory Type: Test Card, Transmitter, 434MHz
• Wireless Frequency: 434 MHz
• Interface Type: SPI
• Modulation: FSK, OOK
• For Use With/related Products: EZRadio®
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

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
#Samp
Log
10
dB/
VAvg
24
W1 S2
S3 FC
Center 434 MHz
#Res BW 1 kHz
Ref 10 dBm
#Peak
Log
10
dB/
VAvg
3
W1 S2
S3 FC
Center 434 MHz
#Res BW 3 kHz
AA
AA
With 10 MHz CLK Output Enabled at 433 MHz
17:11:41 Dec 7, 2005
17:18:23 Dec 7, 2005
180 kHz Deviation at 64 kbps
Spurious RF Spectrum
Atten 20 dB
Atten 20 dB
At 433 MHz with
#VBW 300 Hz
#VBW 1 kHz
1R
Sweep 4.074 s (2000 pts)
Sweep 45.47 s (2000 pts)
Mkr1

Span 50 MHz
Span 2 MHz
-44.23 dB
19.98 MHz
1
Ref 10 dBm
#Samp
Log
10
dB/
VAvg
50
W1 S2
S3 FC
Center 868 MHz
#Res BW 1 kHz
AA
17:26:17 Dec 7, 2005
Antenna Tuning Characteristics
180 kHz Deviation at 64 kbps
Atten 20 dB
At 868 MHz with
750–970 MHz
#VBW 1 kHz
Sweep 4.074 s (2000 pts)
Si4021
Span 2 MHz
11