RFM12B_15 Datasheet, PDF (12/41 Pages) List of Unclassifed Manufacturers – Universal ISM Band FSK Transceiver

RFM12B
Note 1: Measured with disabled clock output buffer
Note 2: Not using a 10 MHz crystal is allowed but not recommended because all crystal referred timing and frequency parameters
will change accordingly
Note 3: See the BER diagrams in the measurement results section for detailed information
Note 4: See reference design with 50 Ohm Matching Network for details
Note 5: See reference design with Resonant PCB Antenna (BIFA) for details
Note 6: Optimal antenna admittance/impedance:
RFM12B
433 MHz
868 MHz
915 MHz
Y _antenna [mS]
2 – j5.9
1.2 - j11.9
1.49 - j12.8
Z_antenna [Ohm]
52 + j152
7.8 + j83
9 + j77
L _antenna [nH]
62
15.4
13.6
Note 7: Adjustable in 8 steps
Note 8: During the Power-On Reset period, commands are not accepted by the chip. In case of software reset (see Wake-Up Timer
Command) the reset timeout is 0.25ms typical.
Note 9: The crystal oscillator start up time strongly depends on the capacitance seen by the oscillator. Low capacitance and low
ESR crystal is recommended with low parasitic PCB layout design.
Note 10: By design
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