RFM01 Datasheet, PDF (9/31 Pages) List of Unclassifed Manufacturers – Universal ISM Band FSK Receiver

RFM01
AC Characteristics (continued)
Symbol
f_ref
f_res
t_lock
t_{st, P}
C_xl
t_POR
t_sx
t_PBt
t_wake-up
C_{in, D}
t_{r, f}
Parameter
PLL reference frequency
PLL frequency resolution
PLL lock time
PLL startup time
Crystal load capacitance,
see crystal selection guide
Internal POR pulse width (Note 4)
Crystal oscillator startup time
Wake-up timer accuracy
Programmable wake-up time
Digital input capacitance
Digital output rise/fall time
Conditions/Notes
(Note 3)
Depends on selected bands
Frequency error < 1kHz after 10 MHz
step
With running crystal oscillator
Min
Typ
Max Units
8
10
12
MHz
2.5
7.5
kHz
20
µs
250
µs
Programmable in 0.5 pF steps, tolerance
+/- 10%
8.5
16
pF
After V_dd has reached 90% of final value
Crystal ESR < 100 Ohms (Note 5)
Crystal oscillator must be enabled to
ensure proper calibration at startup
(Note 5)
15 pF pure capacitive load
50
150
ms
1
5
ms
+/-10
%
1
5·10¹¹
ms
2
pF
10
ns
Note 3: Using other than a 10 MHz crystal is not recommended because the crystal referred timing and frequency parameters will change
accordingly.
Note 4: During this period, commands are not accepted by the chip. For detailed information see the Reset modes section.
Note 5: The crystal oscillator start-up time strongly depends on the capacitance seen by the oscillator. Using low capacitance and low ESR
crystal is recommended. When designing the PCB layout keep the trace connecting to the crystal short to minimize stray
capacitance.
9