MICRF218 Datasheet, PDF (1/24 Pages) Micrel Semiconductor – 3.3V, QwikRadio® 300 MHz to 450 MHz Receiver

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 [phone] • fax + 1 [phone] • http://www.micrel.com
September 2007
M9999-090607
[phone]