RFM219SW Datasheet, PDF (6/35 Pages) List of Unclassifed Manufacturers – Wireless Alarm and Security Systems

RFM219SW
1.4 Crystal Oscillator
Table 5. Crystal Oscillator Specifications
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Crystal Frequency^[1]
Crystal Tolerance^[2]
FXTAL
26
26
26
MHz
±20
ppm
Load Capacitance
CLOAD
10
15
20
pF
Crystal ESR
Rm
XTAL Startup Time^[3]
tXTAL
60
Ω
400
us
Notes:
[1]. The RFM219SW can directly work with external 26 MHz reference clock input to XIN pin (a coupling capacitor is required)
with peak-to-peak amplitude of 0.3 to 0.7 V.
[2]. This is the total tolerance including (1) initial tolerance, (2) crystal loading, (3) aging, and (4) temperature dependence.
The acceptable crystal tolerance depends on RF frequency and channel spacing/bandwidth.
[3]. This parameter is to a large degree crystal dependent.
1.5 LPOSC
Table 6. LPOSC Specifications
Parameter
Calibrated Frequency^[1]
Symbol
FLPOSC
Conditions
Min
Typ
Max
Unit
1
kHz
Frequency Accuracy
Temperature Coefficient^[2]
Supply Voltage Coefficient^[3]
After calibration
1
-0.02
+0.5
%
%/°C
%/V
Initial Calibration Time
tLPOSC-CAL
4
ms
Notes:
[1]. The LPOSC is automatically calibrated to the crystal oscillator during the PUP state, and is periodically calibrated since
then.
[2]. Frequency drifts when temperature changes after calibration.
[3]. Frequency drifts when supply voltage changes after calibration.
E-mail:[e-mail]
Rev 1.0 | Page 6/35
www.hoperf.com