SX1211 Просмотр технического описания (PDF) - Semtech Corporation
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SX1211 Datasheet PDF : 92 Pages
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ADVANCED COMMUNICATIONS & SENSING
SX1211
2.4.2. Frequency Synthesis
Table 6: Frequency Synthesizer Specification
Symbol
FR
BR_F
BR_O
FDA
XTAL
FSTEP
TS_OSC
TS_FS
Description
Conditions
Min
Frequency ranges
Programmable but requires
specific BOM
863
902
950
Bit rate (FSK)
NRZ
1.56
Bit rate (OOK)
NRZ
1.56
Frequency deviation (FSK)
33
Crystal oscillator frequency
9
Frequency synthesizer
step
Variable, depending on the
frequency.
-
Oscillator wake-up time
From Sleep mode(1)
-
Frequency synthesizer
wake-up time at most
10 kHz away from the
From Stby mode
-
target
200 kHz step
-
1 MHz step
-
Frequency synthesizer hop 5 MHz step
-
TS_HOP
time at most 10 kHz away 7 MHz step
-
from the target
12 MHz step
-
20 MHz step
-
27 MHz step
-
(1) Guaranteed by design and characterization
2.4.3. Transmitter
Table 7: Transmitter Specification
Symbol
Description
Conditions
Min
RFOP
RF output power,
Maximum power setting
-
programmable with 8 steps
of typ. 3dB
Minimum power setting
-
Measured with a 600 kHz
PN
Phase noise
offset, at the transmitter
-
output.
At any offset between
SPT
Transmitted spurious
200 kHz and 600 kHz,
unmodulated carrier, Fdev
-
= 50 kHz.
TS_TR(1)
Transmitter wake-up time From FS to Tx ready.
-
TS_TR2(1)
Transmitter wake-up time From Stby to Tx ready.
-
(1) Guaranteed by design and characterization
Typ
-
-
-
-
-
50
12.8
2
1.5
500
180
200
250
260
290
320
340
Typ
+12.5
-8.5
-112
-
120
600
Max
870
928
960
200
32
200
15
-
5
Unit
MHz
MHz
MHz
Kb/s
Kb/s
kHz
MHz
kHz
ms
800 µs
-
µs
-
µs
-
µs
-
µs
-
µs
-
µs
-
µs
Max
-
-
-
Unit
dBm
dBm
dBc/Hz
-47
dBc
500 µs
900 µs
Rev 7 – Sept 2nd, 2008
Page 9 of 92
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