SI4012 Silicon Laboratories, SI4012 Datasheet - Page 5

• Manufacturer Part Number: SI4012
• Description: CRYSTAL-LESS RF TRANSMITTER
• Manufacturer: Silicon Laboratories

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Table 3. Si4012 RF Transmitter Characteristics
(TA = 25° C, VDD = 3.3 V, RL = 550 , unless otherwise noted)
Parameter
Frequency Range
Frequency Noise (rms)
Phase Noise @ 915 MHz
Frequency Tuning Time
Selected Frequencies in
Range of 27–960 MHz
Carrier Frequency Accuracy
Notes:
Frequency Error
Contribution with External
Crystal
1. The frequency range is continuous over the specified range.
2. The frequency step size is limited by the frequency noise.
3. Optimum differential load is equal to 4 V/(11.5mA/2 * 4/PI) = 550 Therefore the antenna load resistance in parallel
with the Si4012 differential output resistance should equal 600 
1
2
Symbol
F
RF
Allen deviation, measured
Discrete frequencies
across 1 ms interval
–40°C ≤ T
–40°C ≤ T
–40°C ≤ T
–40°C ≤ T
–40°C ≤ T
–40°C ≤ T
F
F
0°C ≤ T
0°C ≤ T
0°C ≤ T
0°C ≤ T
0°C ≤ T
0°C ≤ T
RF
RF
Test Condition
F
F
F
F
F
F
F
F
100 kHz offset
10 kHz offset
1 MHz offset
RF
RF
RF
RF
RF
RF
RF
RF
= 433.92 MHz
= 433.92 MHz
Rev 0.1
= 100 MHz
= 100 MHz
= 315 MHz
= 315 MHz
= 868 MHz
= 868 MHz
= 915 MHz
= 915 MHz
A
A
A
A
A
A
A
A
A
A
A
A
≤ 70° C
≤ 70° C
≤ 70° C
≤ 70° C
≤ 70° C
≤ 70° C
≤ 85° C
≤ 85° C
≤ 85° C
≤ 85° C
≤ 85° C
≤ 85° C
–47.3
–78.8
–65.1
–150
–250
–108
–130
–217
–137
–229
Min
–15
–25
–10
27
—
—
—
—
—
—
—
—
—
—
433.92
–100
–105
Typ
–70
315
390
868
915
0.3
—
—
—
—
—
—
—
—
—
—
—
—
5
+150
+250
Max
47.3
78.8
65.1
960
108
130
217
137
229
+10
—
—
—
15
25
—
—
—
—
—
—
—
Si4012
dBc/Hz
dBc/Hz
dBc/Hz
MHz
MHz
MHz
MHz
MHz
MHz
Unit
ppm
ppm
ppm
ppm
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
ms
5
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