MICRF219 Datasheet, PDF (1/24 Pages) Micrel Semiconductor – 300MHz to 450MHz ASK Receiver with RSSI, Auto-Poll, Bit-Check and Squelch

MICRF219
300MHz to 450MHz ASK Receiver with
RSSI, Auto-Poll, Bit-Check and Squelch
General Description
Features
The MICRF219 is a 300MHz to 450MHz super-
heterodyne, image-reject, RF receiver with Automatic
Gain Control, OOK/ASK demodulator and analog 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 components to
implement. It is ideal for low-cost, low-power, RKE,
TPMS, and remote actuation applications.
The MICRF219 achieves -110dBm sensitivity at a data
rate of 1kbps (Manchester encoded). Four demodulator
filter bandwidths are selectable in binary steps from
1625Hz to 13kHz at 433MHz, allowing the device to
support data rates to 10kbps. The device operates from
a supply voltage of 3.0V to 3.6V, and consumes 4.0mA
of supply current at 315MHz and 6.0mA at 433.92MHz.
A shutdown mode reduces supply current to 0.5uA. The
Auto-Polling feature allows the MICRF219 to sleep and
poll for user defined periods, thus further reducing
supply current. The Valid Bit-Check feature, when
enabled in Auto-Poll mode, fully awakes the receiver
and sends bits to the microcontroller once a valid
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
reduces gain by 6dB to 42dB, distancing the receiver
from distantly placed, undesired transmitters.
• –110dBm sensitivity at 1kbps with BER 10E-02
• Supports data rates up to 10kbps at 433.92MHz
• 25dB Image-Reject Mixer
• No IF Filter Required
• 60dB Analog RSSI Output
• 3.0V to 3.6V Supply Voltage Range
• 4.0mA supply current at 315MHz (continuous receive)
• 6.0mA supply current at 434MHz (continuous receive)
• 0.5uA supply current in Shutdown Mode
• Optional Auto-Polling (sleep mode, current < 0.1mA)
• Optional Valid Bit-Check in Auto-Poll Mode
• Optional Programmable 6dB to 42dB Desense
• Optional Data Output Squelch until valid bits detected
• 16-pin QSOP Package (4.9mm x 6.0mm)
• -40˚C to +105˚C Temperature Range
• 2kV HBM ESD Rating
• Evaluation board QR219BPF Available
Ordering Information
Part Number
Temperature Range
MICRF219AYQS
–40°C to +105°C
Package
16-Pin QSOP
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Typical Application
QwikRadio is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
January 2009
M9999-011509
[phone]