RFM31B
Table 2. Synthesizer AC Electrical Characteristics
Parameter
Synthesizer Frequency
Range
Symbol
F
SYN
Conditions
433MHz band
868MHz band
915MHz band
Synthesizer Frequency
Resolution
Reference Frequency
Input Level
Synthesizer Settling Time
F
RES-LB
F
RES-HB
f
REF_LV
433MHz Band
868/915MHz Band
When using external reference signal
driving XOUT pin, instead of using
crystal. Measured peak-to-peak (V
PP
)
Measured from exiting Ready mode with
XOSC running to any frequency.
Including VCO calibration.
Integrated over
250
kHz bandwidth
(500 Hz lower bound of integration)
F
= 10 kHz
F
= 100 kHz
F
= 1 MHz
F
= 10 MHz
Min
413
848
901
—
—
0.7
156.25
312.5
—
Typ
Max
453
888
929
—
—
1.6
Units
MHz
MHz
MHz
Hz
Hz
V
t
LOCK
—
200
—
µs
Residual FM
Phase Noise
F
RMS
L(f
M
)
—
—
—
—
—
2
–80
–90
–115
–130
4
—
—
—
—
kHz
RMS
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
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