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Micrel
MICRF218
Symbol
Parameter
Condition
Min
Typ
Max
Units
Digital / Control Functions
Input High Voltage
Input Low Voltage
DO pin output current
Output rise and fall
times
Pins DO (As input), SHDN
Pins DO (As input), SHDN
Source @ 0.8 Vdd
Sink @ 0.2 Vdd
CI = 15 pF, pin DO, 10-90%
0.8V DD
260
600
2
0.2V DD
V
V
μA
μsec
RSSI
RSSI DC Output
Voltage Range
0.22
to 2
V
RSSI response slope
RSSI Output Current
RSSI Output
Impedance
RSSI Response Time
-90 dBm to -40 dBm
50% data duty cycle, input power to
Antenna = -20 dBm
35
±1.5
200
0.3
mV/
dBm
mA
?
Sec
Notes:
1.
2.
3.
4.
5.
6.
7.
8.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Device are ESD sensitive. Use appropriate ESD precaution. Exceeding the absolute maximum rating may damage the device.
Sensitivity is defined as the average signal level measured at the input necessary to achieve 10-2 BER (bit error rate). The input signal is
defined as a return-to-zero (RZ) waveform with 50% average duty cycle (Manchester encoded) at a data rate of 1kBPS. Conductive
measurement is performed using 50 ohm test circuit .
Spurious reverse isolation represents the spurious component that appear on the RF input pin (ANT) measured into 50 Ohms with an input RF
matching network.
When data burst does not contain preamble, the duty cycle is then defined as total duty cycle, including any “quiet” time between data bursts.
When data bursts contain preamble sufficient to charge the slice level on capacitor Cth, then duty cycle is the effective duty cycle of the burst
alone. [For example, 100msec burst with 50% duty cycle, and 100msec “quiet” time between bursts. If burst includes preamble, duty cycle is
T ON /(T ON + t OFF ) = 50%; without preamble, duty cycle is T ON /(T ON + T OFF + T QUIET ) = 50msec/(200msec) = 25%. T ON is the (Average number of
1’s/burst) × bit time, and T OFF = T BURST – T ON .)
Parameter scales linearly with reference oscillator frequency f T . For any reference oscillator frequency other than one of the tabulated
frequencies (called F TAB ), compute new parameter value as the ratio:
Parameter at f REFOSC MHz = ( f REFOSC MHz /F TAB ) × ( parameter at F TAB MHz )
Parameter scales inversely with reference oscillator frequency fT. For any reference oscillator frequency other than one of the tabulated
frequencies (called F TAB ), compute new parameter value as the ratio:
Parameter at f REFOSC MHz = ( F TAB / f REFOSC MHz ) × ( parameter at F TAB MHz )
November 2011
5
M9999-111111
(408) 944-0800
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