SI4012 查看數據表（PDF） - Silicon Laboratories
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SI4012 Datasheet PDF : 50 Pages
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Si4012
Table 3. Si4012 RF Transmitter Characteristics1
(TA = 25 °C, VDD = 3.3 V, RL = 550 , unless otherwise noted)
Parameter
Frequency Range (FRF)2
Frequency Noise (rms)3
Phase Noise @ 915 MHz
Frequency Tuning Time
Carrier Frequency Accuracy
Frequency Error Contribution
with External Crystal
Transmit Power4
PA Edge Ramp Rate
Programmable Range
Data Rate
FSK Deviation
OOK Modulation Depth
Antenna Tuning Capacitive
Range (Differential)
Test Condition
Allen deviation, measured across
1 ms interval
10 kHz offset
100 kHz offset
1 MHz offset
0 °C ≤ TA ≤ 70 °C
–40 °C ≤ TA ≤ 85 °C
Min
27
—
—
—
—
—
–150
–250
–10
Typ
—
0.3
–70
–100
–105
5
—
Max
960
—
—
—
—
—
+150
+250
+10
Maximum programmed Tx power,
with optimum differential load, VDD
—
10
—
> 2.2 V
Minimum programmed TX power,
with optimum differential load,
—
–13
—
VDD > 2.2 V
Power variation vs temp and supply,
with optimum differential load,
–1.0
—
0.5
VDD > 2.2 V
Power variation vs temp and supply,
with optimum differential load,
–2.5
—
0.5
VDD > 1.8 V
Transmit power step size
from –13 to 6.5 dBm
—
0.25
—
OOK mode
0.34
—
10.7
OOK
FSK
Max frequency deviation
Deviation resolution
Deviation accuracy
0.1
—
50
0.1
—
100
—
275
—
—
2
—
±(4 ppm + 2% pk-pk target FSK
deviation in ppm)
60
—
—
315 MHz
2.4
—
12.5
Unit
MHz
ppm
dBc/Hz
dBc/Hz
dBc/Hz
ms
ppm
ppm
ppm
dBm
dBm
dB
dB
dB
us
kbaud
kbaud
ppm
ppm
ppm
dB
pF
Notes:
1. All specifications guaranteed by production test unless otherwise noted. Production test conditions and max limits are
listed in "1.1. Definition of Test Conditions" on page 7.
2. The frequency range is continuous over the specified range.
3. The frequency step size is limited by the frequency noise.
4. Optimum differential load is equal to 4 V/(11.5 mA/2 x 4/PI) = 550 Therefore the antenna load resistance in parallel
with the Si4012 differential output resistance should equal 600
Rev 1.1
5
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