RFM22
Table 2. Synthesizer AC Electrical Characteristics1
Parameter
Synthesizer Frequency
Range
Symbol
FSYNTH-LB
FSYNTH-HB
FRES-LB
FRES-HB
fREF
Conditions
Low Band
Min
240
480
—
Typ
—
Max
480
930
—
Units
MHz
MHz
Hz
High Band
—
Low Band
156.25
312.5
10
Synthesizer Frequency
Resolution2
High Band
—
—
Hz
Reference Frequency
fcrystal /3
—
—
MHz
When using reference frequency
instead of crystal. Measured
peak-to-peak (VPP)
Measured from leaving Ready mode
with XOSC running to any frequency
includ-ing VCO Calibration
Integrated over ±250 kHz bandwidth
(500 Hz lower bound of integration)
△F = 10 kHz
Reference Frequency
Input Level2
0.7
—
1.6
V
fREF_LV
Synthesizer Settling
Time2
—
—
—
200
2
μs
tLOCK
Residual FM2
4
△FRMS
Lφ (fM)
kHzRMS
—
—
—
—
—
—
—
—
–80
–90
dBc/Hz
dBc/Hz
dBc/Hz
dBc/Hz
△F = 100 kHz
Phase Noise2
△F = 1 MHz
–115
–130
△F = 10 MHz
Notes:
1. All specification guaranteed by production test unless otherwise noted.
2. Guaranteed by qualification.
5
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