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MICRF219 数据表(PDF) 16 Page - Micrel Semiconductor

部件名 MICRF219
功能描述  300MHz to 450MHz ASK Receiver with RSSI, Auto-Poll, Bit-Che
PDF  23 Pages
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制造商  MICREL [Micrel Semiconductor]
网页  http://www.micrel.com
标志 MICREL - Micrel Semiconductor

MICRF219 数据表(HTML) 16 Page - Micrel Semiconductor

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Micrel
MICRF219
June 2011
16
M9999-060811
(408) 944-0800
Figure 8. Example of a Data Profile
For best results, they should always be optimiz d for
the data pattern u
the baud rate increases,
c
itor
s de
se.
e 8
s sugg ted
values for Manches
ncoded data, 50% duty cycle.
L0
1
SEL
JP2
De
(Hz)
Cagc
e
sed. As
crea
ter E
the
apac
value
Tabl
show
es
SE
JP
1
mod.
BW
Cth
Short
Short
1625
100nF
4.7µF
Open
Short
3250
47nF
2.2µF
Short
Open
6500
22nF
1µF
Open
Open
13000
10nF
0.47µF
Table 8. Suggested CTH and CAGC Val
JP3 and JP4 are jumpers selectable to h
and used to configure the digital squelch
When it is tied to high, there is no squelch ap
the digital circuits and the DO (data out)
hash signal. When the pin is low, the DO pi
considerably reduced. It will have more or
shown in the figure below depending upon
ues
igh or lo
fun tio
p
pin
n act
les
the o
band noise. The penalty for using squelch is a d
getting a good signal in the DO pin. This means
takes longer for the data to show up. The de
dependent upon many factors such as RF
intensity, data profile, data rate, CTH and
AGC
capacitor values, and outside band noise See Figure
9 and Figure 10. Please note that Squelch action is
based on the Bitcheck operation and may be
optimized using the Bitcheck Window serial register
w
n.
c
lied to
has a
ivity is
s than
utside
elay in
that it
lay is
signal
C
setting.
Figure 9. Data Out Pin with No Squelch (SQ = 1)
Figure 10. Data Out Pin with
Other compo
Squelch (SQ = 0)
nents used are C5, which is a decoupling
capacitor for the VDD line; R3 for the shutdown pin
(SHDN = 0, device is operation), which can be
removed if that pin is connected to a microcontroller or
an external switch; and R1 and R2 which form a
voltage divider for the
pin. One can force a
voltage in this AGC pin to purposely decrease the
device sensitivity. Special care is needed when doing
this operation, as an external control of the AGC
voltage may vary from lot to lot and may not work the
same in several devices.
AGC



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