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PDF MICRF218 Data sheet ( Hoja de datos )
| Número de pieza | MICRF218 | |
| Descripción | QwikRadio 300 MHz to 450 MHz Receiver | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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MICRF218
3.3V, QwikRadio® 300 MHz to 450 MHz Receiver
General Description
Micrel’s MICRF218 is the world’s first integrated ASK /
OOK receiver with selectable dual IF bandwidths for
300~450 MHz operation. The receiver architecture is
super-heterodyne. The MICRF218 has fully integrated
IF section with image rejection to bring performance,
simplicity and ease of implementation to the receiver
portion of RF actuation.
The MICRF218 is a true RF in, data out receiver. IF
filter and image rejection functions are built-in. Dual IF
bandwidths enable the MICRF218 to capture signals
from either high performance or low cost transmitters.
In addition, all post-detection data filtering is provided on
the MICRF218. The user has a choice of four filter
bandwidths that may be selected externally in binary
steps, from 1.25 kHz to 10 kHz. The user only needs to
program the device with a set of easily determined
values, based upon data rate, code modulation format,
and desired duty-cycle operation. The MICRF218 has a
shutdown control for duty-cycle operation to reduce
average current consumption. It has analog RSSI
output, indicating the strength of incoming signal.
The device is unique for its ability to “escape” from a
jamming source and move to an alternate frequency.
Dual IF bandwidths function plus fast response time
provide easy implementation of dual frequency
operations. It can accommodate two reference crystals
with the use of an external switch. Once the system
detects a strong jamming signal on one frequency, the
MICRF218 can switch to another frequency via a
switching crystal. This is the ideal receiver for “Jam
Avoidance”.
Features
• Complete receiver on a chip
• 300 MHz to 450 MHz frequency range
• Selectable IF frequency and bandwidth
• -108 dBm sensitivity, 550kHz IF BW, 1.0 Kbps BER
10 E-2 @ 433.92MHz
• -106 dBm sensitivity, 1500kHz IF BW, 1.0 Kbps BER
10 E-2 @ 433.92MHz
• Built-in Image Rejection Mixer
• Low Power, 4 mA @ 315 MHz, continuous on
• Data Rates to 10 kbps (Manchester Encoded) @
433.92 MHz
• Duty Cycling Capable > 100:1 (shut down mode)
• Analog RSSI Output
• No IF filter required
• Excellent selectivity and noise rejection
• Low external part count
Ordering Information
Part Number
MICRF218AYQS
Temperature Range Package
–40° to +85°C
16-Pin QSOP
QwikRadio is a registered trademark of Micrel, Inc.
MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 2007
M9999-090607
(408) 944-0800
1 page  
Micrel
www.DataSheet4U.com
Symbol
Parameter
AGC Attack / Decay
Ratio
AGC pin leakage
current
AGC Dynamic Range
@ fRX = 433.92MHz
Reference Oscillator
Frequency
Input Impedance
Input Range
Source Current
Demodulator
CTH Source
Impedance
CTH Leakage Current
Demodulator Filter
Bandwidth @ 315
MHz
CTH Source
Impedance
CTH Leakage Current
Demodulator Filter
Bandwidth @ 433.92
MHz
Condition
tATTACK / tDECAY
TA = 25ºC
TA = +85ºC
RFIN @ -50dBm
RFIN @ -110dBm
fRX = 315 MHz, Narrow IF, IF_BW = VSS
Crystal Load Cap = 10pF
fRX = 315 MHz, Wide IF, IF_BW = VDD
Crystal Load Cap = 10pF
fRX = 433.92 MHz Narrow IF, IF_BW = VSS
Crystal Load Cap = 10pF
fRX = 433.92 MHz Wide IF , IF_BW = VDD
Crystal Load Cap = 10pF
V(REFOSC) = 0V
fREFOSC = 9.8131MHz, 315MHz, Note 8
TA = 25ºC
TA = +85ºC
SEL0=0, SEL1=0
SEL0=0, SEL1=1
SEL0=1, SEL1=0
SEL0=1, SEL1=1
fREFOSC = MHz, 433.92MHz, note 8
TA = 25ºC
TA = +85ºC
SEL0=0, SEL1=0
SEL0=0, SEL1=1
SEL0=1, SEL1=0
SEL0=1, SEL1=1
MICRF218
Min Typ Max Units
0.1
±2
± 800
1.13
1.70
nA
nA
V
V
9.8131
MHz
9.78823
MHz
13.5178
MHz
13.48352
MHz
300 kΩ
0.2 1.5 Vp-p
3.5 µA
165
±2
± 800
1180
2360
4720
9420
120
±2
± 800
1625
3250
6500
13000
kΩ
nA
Hz
Hz
Hz
Hz
kΩ
nA
Hz
Hz
Hz
Hz
September 2007
5
M9999-090607
(408) 944-0800
5 Page 
Micrel
www.DataSheet4U.com
passes through a third order band pass filter. The IF
Band-Pass filters are fully integrated inside the
MICRF218. After filtering, four active gain controlled
amplifier stages enhance the IF signal to proper level
for demodulation.
IF Bandwidth General Description
The MICRF218 has IF filters which may be configured
for operation in a narrow band or wide band mode
using the IF_BW pin. This pin must not be left floating;
it must be tied to VDD or VSS. With the use of a
13.4835MHz crystal and the IF_BW = VDD (wide
mode) the IF frequency is set to 2.4MHz with a
bandwidth of 1500kHz. With the use of a 13.5178MHz
crystal and the IF_BW = VSS (narrow mode) the IF
frequency is set to 1.4MHz with a bandwidth of
550kHz at 433.92MHz.
The crystal frequency for Wide Bandwidth IF
operation is given by:
REFOSC
=
Operating Freq
(32 + 2.178 )
MHz
12
(1)
The crystal frequency for Narrow Bandwidth IF
operation is given by:
REFOSC
=
Operating Freq
(32 + 1.198 )
MHz
12
(2)
Note: The IF frequency, IF bandwidth, and IF
separation between IF_BW modes using a single
crystal will scale linearly and can be calculated as
follows:
IF_Parameter = IF_Parameter @ 433.92 MHz
*
⎜⎜⎝⎛
Operating Freq (MHz)
433.92(MHz)
⎟⎟⎠⎞
Switched Crystal Application
Operation
(3)
Appropriate choice of two crystal frequencies and
IF_BW mode switching allows operation at two
different frequencies; one with low bandwidth
operation and the other with high bandwidth
operation. Either the lower or higher reception
frequency may use the wider IF bandwidth by utilizing
MICRF218
the appropriate equation (1) or (2) for each crystal
frequency.
The following circuit, Figure 4, is an example of
switched crystal operation. The IF Bandwidth Control
and REF-OSC Control allow switching between two
operating frequencies with either a narrow bandwidth
or a wide bandwidth. In this case, the logic control
switches between 390MHz in Wide Band Mode and
315MHz in Narrow Bandwidth Mode. The advantage
of this circuit is when a RF interferer is at one
frequency, the receiver can go to another frequency to
get clear reception.
Figure 5 shows PCB layout for MICRF218 with
switched crystal operation. Please contact the Micrel
RF Application Group for detailed document.
Dual Frequency Configuration Examples:
Scenario 1:
• Frequency 1 - 315MHz Narrow Bandwidth
• Frequency 2 - 433.92MHz Wide Bandwidth
A 9.81314MHz crystal switched in circuit during
narrow IF mode, combined with a 13.48352MHz
crystal, allows operation at 315MHz with 400kHz IF
bandwidth, and at 433.92MHz with 1500kHz
bandwidth.
Scenario 2:
• Frequency 1 - 315MHz Wide Bandwidth
• Frequency 2 - 433.92MHz Narrow Bandwidth
A 9.78823MHz crystal switched in circuit during Wide
IF mode, combined with a 13.51783MHz crystal,
allows operation at 315MHz with 1000kHz IF
bandwidth, and 433.92MHz with 550kHz IF
bandwidth.
Scenario 3:
• Frequency 1 - 315MHz Narrow Bandwidth
• Frequency 2 - 433.92MHz Narrow Bandwidth
A 9.8131MHz crystal switched in circuit, combined
with a 13.51783MHz crystal during narrow IF mode,
allows operation at 315MHz with 400kHz IF
bandwidth, and at 433.92MHz with 550kHz
bandwidth.
September 2007
11
M9999-090607
(408) 944-0800
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MICRF218.PDF ] | |
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