MICRF218_11 Datasheet, PDF (1/23 Pages) Micrel Semiconductor – 3.3V, 315/433MHz Wide-IF Bandwidth ASK Receiver

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
Part Number
MICRF218AYQS
Temperature Range
–40° to +85°C
Package
16-Pin QSOP
Application Example
ANT
PCB Pattern
C2
1.5pF 50V
L1
39nH
C1
L2
6.8pF 68nH
+3V
C3
0.1µF 16V
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
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
November 2011
M9999-111111
[phone]