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MICRF218
3.3V, 315/433MHz Wide-IF Bandwidth ASK Receiver
General Description
The MICRF218 is a 3.0V to 3.6V, 300MHz to 450MHz
ASK/OOK super-heterodyne receiver with user
selectable Intermediate Frequency (IF) Bandwidths of
550kHz or 1500kHz at 433.92MHz, making it an
excellent solution for use with low-cost SAW-based
transmitters or transmitters which use low-cost, medium-
grade (~30ppm) crystals. The device requires a single,
low-cost crystal to select the proper RF frequency,
integrated Automatic Gain Control (AGC), data slicer,
and programmable baseband filter bandwidths of
1.6kHz to 13kHz allowing the device to support bit-rates
up to 20kbps at 433.92MHz.
The MICRF218 consumes 4.0mA of supply current at
315MHz and 5.5mA of supply current at 433.92MHz.
The device also features a low-power shutdown mode
where the device consumes 1 ? A of supply current. The
device achieves a sensitivity of -108dBm at 1kbps. For
transmitters using higher-quality (~10ppm) crystals, the
MICRF219A/MICRF220 offer an IF-bandwidth of
330kHz and a sensitivity of -110dBm at 1kbps, which
can provide better sensitivity and longer range
performance.
Features
? Fully integrated 300 to 450MHz ASK/OOK Receiver
? No external IF Filter Required
? Wide IF-Bandwidth filter supports reception of SAW
based and medium-grade (~30ppm) transmitter
? Sensitivity at 433.92MHz at 1kbps with 0.1% BER
o -108dBm sensitivity with 550kHz IF Bandwidth
o -106dBm sensitivity with 1500kHz IF Bandwidth
? Low-Supply Current
o 4.0mA at 315MHz
o 5.5mA at 433.92MHz
o 1μA low-power shutdown mode
? Data Rates to 10 kbps (Manchester Encoded) @
433.92 MHz
? Duty Cycling Capable > 100:1 (shut down mode)
? 60dB Analog Received Signal Strength Indicator
? 16-pin QSOP (4.9mm x 6.0mm) package
Ordering Information
Application Example
ANT
PCB Pattern
Part Number
MICRF218AYQS
Y1
9.8131MHz
U1 MICRF218AYQS
Temperature Range
–40° to +85°C
Package
16-Pin QSOP
C2
1.5pF 50V
1
2
RO1
GNDRF
RO2
NC
16
15
3
4
ANT
GNDRF
RSSI
CAGC
14
13
RSSI
+3V
5
VDD
CTH
12
L1
39nH
C1
6.8pF
L2
68nH
C3
0.1μF 16V
6
7
8
IF_BW SEL1
SEL0 DO
SHDN GND
11
10
9
DO
C4
0.1μF
16V
C5
4.7μF
6.3V
IF_BW CONTROL
QwikRadio is a registered trademark of Micrel, Inc.
MLF and Micro LeadFrame 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
November 2011
M9999-111111
(408) 944-0800
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