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Micrel Semiconductor

MICRF219 Datasheet Preview

MICRF219 Datasheet

300MHz to 450MHz ASK Receiver

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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
MICRF219AYQS
Temperature Range
–40°C to +105°C
Package
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
January 2009
M9999-011509
(408) 944-0800




Micrel Semiconductor

MICRF219 Datasheet Preview

MICRF219 Datasheet

300MHz to 450MHz ASK Receiver

No Preview Available !

Micrel
www.DataSheet4U.com
Pin Configuration
MICRF219
RO1 1
GNDRF 2
ANT 3
GNDRF 4
Vdd 5
SQ 6
SEL0 7
SHDN 8
16 RO2
15 SCLK
14 RSSI
13 CAGC
12 CTH
11 SEL1
10 DO
9 GND
MICRF219AYQS
Pin Description
16-Pin
QSOP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin
Name
RO1
GNDRF
ANT
GNDRF
VDD
SQ
SEL0
SHDN
GND
DO
SEL1
CTH
CAGC
RSSI
SCLK
RO2
Pin Function
Reference Oscillator Input: Reference resonator input connection to pierce oscillator stage. May also be
driven by external reference signal of 200mVp-p to 1.5V p-p amplitude maximum. Internal capacitance of
7pF to GND during normal operation.
Negative supply connection associated with ANT RF input.
Antenna Input: RF signal input from antenna. Internally AC coupled. It is recommended a matching network
with an inductor-to-RF ground be used to improve ESD protection.
Ground connection for ANT RF input.
Positive supply connection for all chip functions. Bypass with 0.1uF capacitor located as close to the VDD pin
as possible.
Squelch Control Logic-Level Input. An internal pull-up pulls the logic-input HIGH when the device is enabled.
Bit D17 sets whether squelch is enabled or disabled when a logic-level signal is applied the SQ pin. See
Squelch Enable Truth-Table on page
Demodulator Filter Bandwidth Select Logic-Level Input:) Internal pull-up (3uA typical) when not in shutdown
or SLEEP mode. Used in conjunction with SEL1 to control D3 bandwidth LSB when serial interface contains
default setting. It does not need to be defined in SLEEP mode.
Shutdown control Logic-Level Input. A logic-level LOW enables the device. A logic-level HIGH places the
device in low-power shutdown mode. An internal pull-up pulls the logic input HIGH.
Negative supply connection for all chip functions except for RF input.
Data Input and Output. Demodulated data output. May be blanked until bit checking test is acceptable. A
current limited CMOS output during normal operation this pin is also used as a CMOS Schmitt input for serial
interface data. A 25kpull-down is present when device is in shutdown and sleep modes.
Demodulator Filter Bandwidth Select Logic-Level Input: Internal (3uA typical) pull-up when not in shutdown or
SLEEP mode. Used in conjunction with SEL0, to control D4 bandwidth MSB, when serial interface contains
default setting. It does not need to be defined in SLEEP mode.
Demodulation threshold voltage integration capacitor. Capacitor-to-GND sets the settling time for the
demodulation data slicing level. Values above 1nF are recommended and should be optimized for data rate
and data profile.
AGC filter capacitor. A capacitor, normally greater than 0.47μF, is connected from this pin-to-GND
Received signal strength indication (output): Output is from a switched capacitor integrating op amp with
220typical output impedance.
Serial interface input clock. CMOS Schmitt input. A 25kpull-down is present when device is in shutdown
mode.
Reference resonator connection. Internal capacitance of 7pF to GND during normal operation.
January 2009 2 M9999-011509
(408) 944-0800


Part Number MICRF219
Description 300MHz to 450MHz ASK Receiver
Maker Micrel Semiconductor
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MICRF219 Datasheet PDF





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