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Micrel
Slicer and Slicing Level
The signal, prior to the slicer, is still AM. The data sli cer
MICRF219
The de-sense function is accessible only through serial
programming.
converts the AM signal into ones and ze ros based on
the threshold voltage built up in the CTH cap ac itor.
After the slicer, the signal is ASK or OOK digi tal da ta .
The slicing threshold is default at 50%. The slic ing
threshold ca n b e set via serial programming through
register D5 and D6.
D5
D 6
Slicing Level
D 0
0
1
1
1
1
D1
X
0
1
0
1
D2
X
0
0
1
1
MODE: Desense
No Desense - default
6dB Desense
16dB Desense
30dB Desense
42dB Desense
1
0
0
1
Slice Leve l 30%
Slice Level 40%
Reference Control
There are 2 components in Referen ce and Control sub-
1
0
1
0
Slice Level 50%
Slice Level 60%
- default
block: 1) Reference Oscillator and 2) Control Logic
through parallel Inputs: SEL0, SEL 1, SHDN
AGC Comparator
The AGC comparator monitors the signal amplitude
from the output of the programmable low -p ass filter.
When the output signal is less than 750mV th resh-hold,
1.5μA current is sourced into the external CAGC
capaci tor. When the output signal is greater th an
750mV, a 15μA current sink discharges th e CAGC
capacitor. The voltage developed on t he CA GC
capacitor acts to adjust the gain of the mixer a nd the IF
amplifier to compensate for RF input s ig nal level
variation.
Desense
Desense is a function designed to reduce the se nsitivity
of the MICRF219 receiver to a maximum of 45dB for
training the MICRF219 receiver. This is done in order to
recognize an intended transmitter. Very often, a receiver
needs to learn how to recognize a particular transmitter.
It is important for the receiver not to learn the signal of a
stray transmitter near by. The simplest solution is to turn
down the receiver gain, so the receiver only recognizes
the transmitter at close range.
Reference Oscillator
The reference oscillator in the MICRF219 (Figure 2)
uses a b asic Pierce crystal oscillator configuration with
MOS transconductor to provide negative resistance.
Though the MICRF219 has build-in load capacitors for
the crystal oscill ator, the external load capacitors are still
required for tuning it to the right frequency. R01 and R02
are external pins of the MICRF 219 to connect the crystal
to the reference oscillator.
Reference oscillator crystal freque ncy can be calculated:
F REF OSC = F RF /(32 + 1.1/12)
For 433.92 MHz, F REF OSC = 13.52127 MHz.
To operate the MICRF219 with minimum offset, crystal
frequencies should be specified with 10pF loading
capacitance.
June 2011
8
M9999-060811
(408) 944-0800
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