MICRF219
300MHz to 450MHz ASK Receiver w ith
RSSI, Auto-Poll, Bit-Che ck and Squelch
NOT RECOMMENDED
REFER TO MICRF219A FOR NEW DESIGNS
General Description
Features
The MICRF219 is a 300MHz to 450MH z super-
heterodyne, image-reject, RF receiver with Automatic
Gain Control, OOK/ASK demodulator and a nalog RSSI
output. The device integrates Auto-Poll, Valid Bit-Check,
Squelch, and Desense features. It only requires a
crystal and a minimum number of external c omponents
to implement. It is ideal for low-cost, low-po wer, RKE,
TPMS, and remote actuation applications.
The MICRF219 achieves ? 110dBm sensitivit y at a data
rate of 1kbps (Manchester encoded). Four d emodulator
filter bandwidths are selectable in binary steps from
1625Hz to 13kHz at 433MHz, allowing the device to
support data rates to 10kbps. The device ope rates from
a supply voltage of 3.0V to 3.6V, and consum es 4.0mA
of supply current at 315MHz and 6.0mA at 4 3 3.92MHz.
A shutdown mode reduces supply current to 0 .5 uA. The
Auto-Polling feature allows the MICRF219 to s leep and
poll for user defined periods, thus furthe r reducing
supply current. The Valid Bit-Check feature, when
enabled in Auto-Pol l mode, fully awakes the receiver
and sends bits to the microcontroller once a valid
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–110 dBm sensitivity at 1kbps with 1% BER
Supports data rates up to 10kbps at 433.92MHz
25dB Image-Re ject Mixer
No IF Filter Required
60dB Analog RSSI Output
3.0V to 3.6V Supply Voltage R ange
4.0mA supply current at 315MHz (continuous receive)
6.0mA supply current at 434M Hz (continuous receive)
0.5uA supply current in Shutdown Mode
Optional Auto-Pol ling (sleep mode, current < 0.1mA)
Optio nal Valid Bit-Che ck in Auto-Poll Mode
Optional Programm able 6dB to 42dB Desense
Optional Data Output Squelch until valid bits detected
1 6-pin QSOP Pac kag e (4.9m m x 6.0mm)
? 40 ° C to +105 ° C Te mperature Rang e
2kV HBM ESD Rating
Evaluation board QR219BPF Available
number of bits are detected. During normal operation an
optional Squelch feature disables the data output until
valid bits are detected. An optional Desense feature
Ordering Information
Part Number Temperature Range Package
reduces gain by 6dB to 42dB, distancing the receiver
from distantly placed, undesired transmitters.
MICRF219AYQS
? 40 ° C to +105 ° C
16-Pin QSOP
_______________________________________________________________________________________________
Typical Application
QwikRadio is a registered trademark of Micrel, 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
June 2011
M9999-060811
(408) 944-0800
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