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Micrel Semiconductor

MICRF218 Datasheet Preview

MICRF218 Datasheet

QwikRadio 300 MHz to 450 MHz Receiver

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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




Micrel Semiconductor

MICRF218 Datasheet Preview

MICRF218 Datasheet

QwikRadio 300 MHz to 450 MHz Receiver

No Preview Available !

Micrel
www.DataSheet4U.com
Application Example
ANT
PCB Pattern
C2
1.5pF 50V
L1
39nH
C1 L2
6.8pF 68nH
+3V
C3
0.1µF 16V
MICRF218
Y1
9.8131MHz
U1 MICRF218AYQS
1 RO1
RO2 16
2 GNDRF
NC 15
3 ANT
RSSI 14
4 GNDRF
CAGC 13
5 VDD
CTH 12
6 IF_BW
SEL1 11
7 SEL0
DO 10
8 SHDN
GND 9
RSSI
DO
C4
0.1µF
16V
C5
4.7µF
6.3V
IF_BW CONTROL
Pin Configuration
315MHz/315.802, 900Hz Baud Rate Example
RO1 1
GNDRF 2
ANT 3
GNDRF 4
Vdd 5
IF_BW 6
SEL0 7
SHDN 8
16 RO2
15 NC
14 RSSI
13 CAGC
12 CTH
11 SEL1
10 DO
9 GND
MICRF218AYQS
Pin Description
16-Pin
QSOP
1
2
3
4
5
6
7
8
9
Pin
Name
RO1
GNDRF
ANT
GNDRF
VDD
IF_BW
SEL0
SHDN
GND
Pin Function
Reference resonator input connection to Colpitts oscillator stage. May also be driven by external
reference signal of 1.5V p-p amplitude maximum.
Negative supply connection associated with ANT RF input.
RF signal input from antenna. Internally AC-Coupled. It is recommended that a matching network
with an inductor to RF ground is used to improve ESD protection.
Negative supply connection associated with ANT RF input.
Positive supply connection for all chip functions.
IF bandwidth control logic input. Use VDD for Wide IF Bandwidth or VSS for Narrow IF Bandwidth.
This pin must not be left floating, must be tied to VDD or VSS.
Logic control input with active internal pull-up. Used in conjunction with SEL1 to control the
demodulator low pass filter bandwidth. (See filter table for SEL0 and SEL1 in application
subsection)
Shutdown logic control input. Active internal pull-up and must be pulled low for Normal Operation.
Negative supply connection for all chip functions except RF input.
September 2007
2
M9999-090607
(408) 944-0800


Part Number MICRF218
Description QwikRadio 300 MHz to 450 MHz Receiver
Maker Micrel Semiconductor
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MICRF218 Datasheet PDF






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