MICRF211
3V, QwikRadio
®
433.92 MHz Receiver
General Description
The MICRF211 is a general purpose, 3V QwikRadio
Receiver that operates at 433.92MHz with typical
sensitivity of -110dBm.
The MICRF211 functions as a super-heterodyne
receiver for OOK and ASK modulation up to 10kbps.
The down-conversion mixer also provides image
rejection. All post-detection data filtering is provided on
the MICRF211. Any one-of-four filter bandwidths may
be selected externally by the user in binary steps, from
1.25kHz to 10kHz. The user need only configure the
device with a set of easily determined values, based
upon data rate, code modulation format, and desired
duty-cycle operation.
Features
•
•
•
•
•
•
•
•
–110 dBm sensitivity, 1kbps and BER 10E-02
Image Rejection Mixer
Frequency from 380MHz to 450MHz
Low power, 6.0mA @ 433.92MHz, continuous on
data rates to 10kbps (Manchester Encoded)
Analog RSSI Output
No IF filter required
Excellent selectivity and noise rejection
Low external part count
Ordering Information
Part Number
MICRF211AYQS
Temperature Range
–40° to +105°C
Package
16-Pin QSOP
_______________________________________________________________________________________________
Typical Application
433.92 MHz, 1kHz Baud Rate Example
QwikRadio is a registered trademark of Micrel, Inc.
Certain of the QwikRadio ICs were developed under a development agreement with AIT of Orlando, FL.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
March 2007
M9999-030107
(408) 944-0800
Micrel
MICRF211
Pin Configuration
MICRF211AYQS
Pin Description
16-Pin
QSOP
1
2
3
4
5
6
7
8
9
10
11
12
Pin
Name
RO1
GNDRF
ANT
GNDRF
VDD
SQ
SEL0
SHDN
GND
DO
SEL1
CTH
Pin Function
Reference resonator input connection to Colpitts oscillator stage. May also be driven by external reference
signal of 1.5V p-p amplitude maximum.
Negative supply connection associated with ANT RF input.
RF signal input from antenna. Internally AC coupled. It is recommended that a matching network with an
inductor -to-RF ground is used to improve ESD protection.
Negative supply connection associated with ANT RF input.
Positive supply connection for all chip functions.
Squelch control logic input with an active internal pull-up when not shut down.
Logic control input with active internal pull-up. Used in conjunction with SEL1 to control the demodulator low
pass filter bandwidth. (See filter table for SEL0 and SEL1 in application section)
Shutdown logic control input. Active internal pull-up.
Negative supply connection for all chip functions except RF input.
Demodulated data output.
Logic control input with active internal pull-up. Used in conjunction with SEL0 to control the demodulator low
pass filter bandwidth. (See filter table for SEL0 and SEL1 in application section)
Demodulation threshold voltage integration capacitor connection. Tie an external capacitor across CTH pin
and GND to set 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 connection. CAGC capacitor, normally greater than 0.47µF, is connected from this pin to
GND
Received signal strength indication output. Output is from a buffer with 200Ω typical output impedance.
Not Connected (Connect to Ground)
Reference resonator input connection to Colpitts oscillator stage, 7pF, in parallel with low resistance MOS
switch-to-GND, during normal operation. Driven by startup excitation circuit during the internal startup control
sequence.
13
14
15
16
CAGC
RSSI
NC
RO2
March 2007
2
M9999-030107
(408) 944-0800
Micrel
MICRF211
Absolute Maximum Ratings
(1)
Supply Voltage (V
DD
) .................................................+5V
Input Voltage .............................................................+5V
Junction Temperature ......................................... +150ºC
Lead Temperature (soldering, 10sec.) .................. 260°C
Storage Temperature (T
S
) .....................-65ºC to +150°C
Maximum Receiver Input Power ........................+10dBm
ESD Rating
(3)
.................................................. 2KV CDM
...................................................200V HBM
................................ 100V Machine Model
Operating Ratings
(2)
Supply voltage (V
DD
) ..............................+3.0V to +3.6V
Ambient Temperature (T
A
) ................. –40°C to +105°C
Input Voltage (V
IN
)........................................ 3.6V (Max)
Maximum Input RF Power................................ –20dBm
Electrical Characteristics
(4)
Specifications apply for 3.0V < V
DD
< 3.6V, V
SS
= 0V, C
AGC
= 4.7µF, C
TH
= 0.1µF, f
RX
= 433.92 MHz, unless otherwise
noted.
Bold
values indicate –40°C – T
A
– 105°C. 1kbps data rate (Manchester encoded), reference oscillator
frequency = 13.52127MHz.
Symbol
I
SS
I
SHUT
Parameter
Operating Supply
Current
Shut down Current
Image Rejection
1 IF Center
Frequency
Receiver Sensitivity @
1kbps
IF Bandwidth
Antenna Input
Impedance
Receive Modulation
Duty Cycle
AGC Attack / Decay
Ratio
AGC pin leakage
current
AGC Dynamic Range
Reference Oscillator
Reference Oscillator
Frequency
Reference Oscillator
Input Impedance
Reference Oscillator
Input Range
Reference Oscillator
Source Current
f
RX
= 433.92 MHz
Crystal Load Cap = 10pF
13.52127
st
Condition
Continuous Operation, f
RX
= 433.92MHz
Min
Typ
6.0
0.5
20
Max
Units
mA
µA
dB
MHz
dBm
kHz
Ω
RF/IF Section
f
RX
= 433.92MHz
f
RX
= 433.92MHz (matched to 50
Ω)
BER=10
-2
f
RX
= 433.92MHz
f
RX
= 433.92MHz
Note 5
t
ATTACK
/ t
DECAY
T
A
= 25ºC
T
A
= +105ºC
RF
IN
@ -40dBm
RF
IN
@ -100dBm
20
1.2
-110
330
19 –
j174
80
0.1
±2
± 800
1.15
1.70
%
nA
nA
V
V
MHz
kΩ
1.5
Vp-p
µA
300
0.2
V(REFOSC) = 0V
3.5
March 2007
3
M9999-030107
(408) 944-0800
Micrel
MICRF211
Demodulator
Symbol
Parameter
CTH Source
Impedance
CTH Leakage Current
Demodulator Filter
Bandwidth @ 434MHz
Digital / Control Functions
DO pin output current
Output rise and fall
times
RSSI
RSSI DC Output
Voltage Range
RSSI response slope
RSSI Output Current
RSSI Output
Impedance
RSSI Response Time
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Condition
F
REFOSC
= 13.52127MHz
T
A
= 25ºC
T
A
= +105ºC
Programmable, see application section
Min
Typ
120
±2
± 800
Max
Units
kΩ
nA
nA
Hz
1625
13000
source @ 0.8 Vdd
sink @ 0.2 Vdd
CI = 15pF, pin DO, 10-90%
As output
260
600
2
µA
µsec
0.4 to 2
-110dBm to -40dBm
25
400
200
50% data duty cycle, input power to
Antenna = -20dBm
0.3
V
mV/dB
µA
Ω
sec
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside of its operating rating.
Device is ESD sensitive. Use appropriate ESD precautions. Exceeding the absolute maximum rating may damage the device.
Sensitivity is defined as the average signal level measured at the input necessary to achieve 10
-2
BER (bit error rate). The input signal is
defined as a return-to-zero (RZ) waveform with 50% average duty cycle (Manchester encoded) at a data rate of 1kbps.
When data burst does not contain preamble, duty cycle is defined as total duty cycle, including any “quiet” time between data bursts. When
data bursts contain preamble sufficient to charge the slice level on capacitor C
TH
, then duty cycle is the effective duty cycle of the burst
alone. [For example, 100msec burst with 50% duty cycle, and 100msec “quiet” time between bursts. If burst includes preamble, duty
cycle is T
ON
/(T
ON
+t
OFF
)= 50%; without preamble, duty cycle is T
ON
/(T
ON
+ T
OFF
+ T
QUIET
) = 50msec/(200msec)=25%. T
ON
is the (Average
number of 1’s/burst) × bit time, and T
OFF
= T
BURST
– T
ON
.)
March 2007
4
M9999-030107
(408) 944-0800
Micrel
MICRF211
Typical Characteristics
Sensitivity Graphs
March 2007
5
M9999-030107
(408) 944-0800
测试/测量
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