MICRF002/RF022
Micrel
MICRF002/RF022
300-440MHz QwikRadio™ASK Receiver
Final Information
General Description
The MICRF002 is a single chip ASK/OOK (ON-OFF Keyed)
RF receiver IC. This device is a true “antenna-in to data-out”
monolithic device. All RF and IF tuning is accomplished
automatically within the IC which eliminates manual tuning
and reduces production costs. The result is a highly reliable
yet low cost solution.
The MICRF002 is a fully featured part in 16-pin packaging,
the MICRF022 is the same part packaged in 8-pin packaging
with a reduced feature set (see “Ordering Information” for
more information).
The MICRF002 is an enhanced version of the MICRF001
and MICRF011. The MICRF002 provides two additional
functions over the MICRF001/011, (1) a Shutdown pin, which
may be used to turn the device off for duty-cycled operation,
and (2) a “Wake-up” output, which provides an output flag
indicating when an RF signal is present. These features make
the MICRF002 ideal for low and ultra-low power applications,
such as RKE and remote controls.
All IF filtering and post-detection (demodulator) data filtering
is provided within the MICRF002, so no external filters are
necessary. One of four demodulator filter bandwidths may be
selected externally by the user.
The MICRF002 offer two modes of operation; fixed-mode
(FIX) and sweep-mode (SWP). In fixed mode the MICRF002
functions as a conventional superhet receiver. In sweep
mode the MICRF002 employs a patented sweeping function
to sweep a wider RF spectrum. Fixed-mode provides better
selectivity and sensitivity performance and sweep mode
enables the MICRF002 to be used with low cost, imprecise
transmitters.
QwikRadio™
Features
• 300MHz to 440MHz frequency range
• Data-rate up to 10kbps (fixed-mode)
• Low Power Consumption
• 2.2mA fully operational (315MHz)
• 0.9µA in shutdown
• 220µA in polled operation (10:1 duty-cycle)
• Wake-up output flag to enable decoders and micropro-
cessors
• Very low RF reradiation at the antenna
• Highly integrated with extremely low external part count
Applications
•
•
•
•
Automotive Remote Keyless Entry (RKE)
Remote controls
Remote fan and light control
Garage door and gate openers
Typical Application
1/4 Wave Monopole
MICRF002
SEL0
SEL0
SWEN
REFOSC
SEL1
CAGC
WAKEB
SHUT
DO
VSSBB
Data
Output
4.7uF
4.8970MHz
12pF
68nH
+5V
VSSRF
VSSRF
ANT
VDDRF
VDDBB
CTH
12nH
0.047uF
NC
315MHz 800bps On-Off Keyed Receiver
QwikRadio is a trademark of Micrel, Inc. The QwikRadio ICs were developed under a partnership agreement with AIT of Orlando, Florida.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
March 2003
1
MICRF002/RF022
MICRF002/RF022
Micrel
Ordering Information
Part Number
MICRF002BM
MICRF022BM-SW48
MICRF022BM-FS12
MICRF022BM-FS24
MICRF022BM-FS48
Demodulator
Bandwidth
User Programable
5000Hz
1250Hz
2500Hz
5000Hz
Operating Mode
Fixed or Sweep
Sweep
Fixed
Fixed
Fixed
Shutdown
Yes
No
Yes
Yes
Yes
WAKEB
Output Flag
Yes
Yes
No
No
No
Package
16-Pin SOP
8-Pin SOP
8-Pin SOP
8-Pin SOP
8-Pin SOP
Pin Configuration
MICRF002Bx
SEL0 1 SEL0
VSSRF 2
VSSRF 3
ANT 4
VDDRF 5
VDDBB 6
CTH 7
NC 8
16 SWEN
15 REFOSC
14 SEL1
13 CAGC
12 WAKEB
11 SHUT
10 DO
9
VSSBB
VSSRF 1
ANT 2
VDDRF 3
CTH 4
MICRF022Bx-xxxx
8
7
6
5
REFOSC
CAGC
SHUT/WAKEB
DO
Standard 16-Pin or 8-Pin SOP (M) Packages
8-Pin Options
The standard 16-pin package allows complete control of all
configurable features. Some reduced function 8-pin versions
are also available, see “Ordering Information” above.
For high-volume applications additional customized 8-pin
devices can be produced. SWEN, SEL0 and SEL1 pins are
internally bonded to reduce the pin count. pin 6 may be
configured as either SHUT or WAKEB.
SEL0
1
0
1
0
SEL1
1
1
0
0
Demodulator Bandwidth
Sweep Mode
5000Hz
2500Hz
1250Hz
625Hz
FIXED Mode
10000Hz
5000Hz
2500Hz
1250Hz
Table 1. Nominal Demodulator Filter Bandwidth vs.
SEL0, SEL1 and Operating Mode
MICRF002/RF022
2
March 2003
MICRF002/RF022
Micrel
Pin Description
Pin Number
16-Pin Pkg.
1
Pin Number
8-Pin Pkg.
Pin Name
SEL0
Pin Function
Bandwidth Selection Bit 0 (Digital Input): Used in conjunction with SEL1 to
set the desired demodulator filter bandwidth. See Table 1. Internally pulled-
up to VDDRF
RF Power Supply: Ground return to the RF section power supply.
Antenna (Analog Input): For optimal performance the ANT pin should be
impedance matched to the antenna. See “Applications Information” for
information on input impedance and matching techniques
RF Power Supply: Positive supply input for the RF section of the IC
Base-Band Power Supply: Positive supply input for the baseband section
(digital section) of the IC
Data Slicing Threshold Capacitor (Analog I/O): Capacitor connected to this
pin extracts the dc average value from the demodulated waveform which
becomes the reference for the internal data slicing comparator
Not internally connected
Base-Band Power Supply: Ground return to the baseband section power
supply
Data Output (Digital Output)
Shutdown (Digital Input): Shutdown-mode logic-level control input. Pull low
to enable the receiver. Internally pulled-up to VDDRF
Wakeup (Digital Output): Active-low output that indicates detection of an
incoming RF signal
Automatic Gain Control (Analog I/O): Connect an external capacitor to set
the attack/decay rate of the on-chip automatic gain control
Bandwidth Selection Bit 1 (Digital Input): Used in conjunction with SEL0 to
set the desired demodulator filter bandwidth. See Table 1. Internally pulled-
up to VDDRF
Reference Oscillator: Timing reference, sets the RF receive frequency.
Sweep-Mode Enable (Digital Input): Sweep- or Fixed-mode operation
control input. SWEN high= sweep mode; SWEN low = conventional
superheterodyne receiver. Internally pulled-up to VDDRF
2, 3
4
1
2
VSSRF
ANT
5
6
7
3
VDDRF
VDDBB
4
CTH
8
9
10
11
12
13
14
7
5
6
NC
VSSBB
DO
SHUT
WAKEB
CAGC
SEL1
15
16
8
REFOSC
SWEN
March 2003
3
MICRF002/RF022
MICRF002/RF022
Micrel
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
DDRF
, V
DDBB
) .................................... +7V
Input/Output Voltage (V
I/O
) ................. V
SS
–0.3 to V
DD
+0.3
Junction Temperature (T
J
) ...................................... +150°C
Storage Temperature Range (T
S
) ............ –65°C to +150°C
Lead Temperature (soldering, 10 sec.) ................... +260°C
ESD Rating,
Note 3
Operating Ratings
(Note 2)
Supply Voltage (V
DDRF
, V
DDBB
) ................ +4.75V to +5.5V
RF Frequency Range ............................. 300MHz to 440Hz
Data Duty-Cycle ............................................... 20% to 80%
Reference Oscillator Input Range ............ 0.1V
PP
to 1.5V
PP
Ambient Temperature (T
A
) ......................... –40°C to +85°C
Electrical Characteristics
V
DDRF
= V
DDBB
= V
DD
where +4.75V
≤
V
DD
≤
5.5V, V
SS
= 0V; C
AGC
= 4.7µF, C
TH
= 100nF; SEL0 = SEL1 = V
SS
; fixed mode ( SWEN
= V
SS
); f
REFOSC
= 4.8970MHz (equivalent to f
RF
= 315MHz); data-rate = 1kbps (Manchester encoded). T
A
= 25°C,
bold
values indicate
–40°C
≤
T
A
≤
+85°C; current flow into device pins is positive; unless noted.
Symbol
I
OP
Parameter
Operating Current
Condition
continuous operation, f
RF
= 315MHz
polled with 10:1 duty cycle, f
RF
= 315MHz
continuous operation, f
RF
= 433.92MHz
polled with 10:1 duty cycle, f
RF
= 433.92MHz
I
STBY
Standby Current
V
SHUT
= V
DD
f
RF
= 315MHz
f
RF
= 433.92MHz
f
IF
f
BW
IF Center Frequency
IF Bandwidth
Maximum Receiver Input
Spurious Reverse Isolation
AGC Attack to Decay Ratio
AGC Leakage Current
Note 6
Note 6
R
SC
= 50Ω
ANT pin, R
SC
= 50Ω,
Note 5
t
ATTACK
÷
t
DECAY
T
A
= +85°C
RF Section, IF Section
Receiver Sensitivity
(Note 4)
–97
–95
0.86
0.43
–20
30
0.1
±100
nA
dBm
dBm
MHz
MHz
dBm
µVrms
Min
Typ
2.2
220
3.5
350
0.9
Max
3.2
Units
mA
µA
mA
µA
µA
Reference Oscillator
Z
REFOSC
Reference Oscillator
Input Impedance
Reference Oscillator Source
Current
Note 8
290
5.2
kΩ
uA
Demodulator
Z
CTH
I
ZCTH(leak)
CTH Source Impedance
CTH Leakage Current
Demodulator Filter Bandwidth
Sweep Mode
(SWEN = V
DD
or OPEN)
Note 6
Demodulator Filter Bandwidth
Fixed Mode
(SWEN =
V
SS
Note 6
Note 7
T
A
= +85°C
V
SEL0
= V
DD
. V
SEL1
V
SEL0
= V
SS
. V
SEL1
V
SEL0
= V
DD
. V
SEL1
V
SEL0
= V
SS
. V
SEL1
V
SEL0
= V
DD
. V
SEL1
V
SEL0
= V
SS
. V
SEL1
V
SEL0
= V
DD
. V
SEL1
V
SEL0
= V
SS
. V
SEL1
= V
DD
= V
DD
= V
SS
= V
SS
= V
DD
= V
DD
= V
SS
= V
SS
145
±100
4000
2000
1000
500
8000
4000
2000
1000
kΩ
nA
Hz
Hz
Hz
Hz
Hz
Hz
Hz
Hz
MICRF002/RF022
4
March 2003
MICRF002/RF022
Symbol
Parameter
Condition
Min
Typ
Max
Micrel
Units
Digital/Control Section
V
IN(high)
V
IN(low)
I
OUT
V
OUT(high)
V
OUT(low)
t
R
, t
F
Note 1.
Note 2.
Note 3.
Note 4:
Note 5:
Note 6:
Input-High Voltage
Input-Low Voltage
Output Current
Output High Voltage
Output Low Voltage
Output Rise and Fall Times
SEL0, SEL1, SWEN
SEL0, SEL1, SWEN
DO, WAKEB pins, push-pull
DO, WAKEB pins, I
OUT
= –1µA
DO, WAKEB pins, I
OUT
= +1µA
DO, WAKEB pins, C
LOAD
= 15pF
10
0.9
0.2
10
0.8
V
DD
V
DD
µA
V
DD
0.1
V
DD
µs
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive, use appropriate ESD precautions. Meets class 1 ESD test requirements, (human body model HBM), in accor-
dance with MIL-STD-883C, method 3015. Do not operate or store near strong electrostatic fields.
Sensitivity is defined as the average signal level measured at the input necessary to achieve 10
-2
BER (bit error rate). The RF input is
assumed to be matched to 50Ω.
Spurious reverse isolation represents the spurious components which appear on the RF input pin (ANT) measured into 50Ω with an input RF
matching network.
Parameter scales linearly with reference oscillator frequency f
T
. For any reference oscillator frequency other than 4.8970MHz, compute
new parameter value as the ratio:
f
REFOSC
MHz
×
(parameter value at 4.8970MHz)
4.8970MHz
Note 7:
Parameter scales inversely with reference oscillator frequency f
T
.
For any reference oscillator frequency other than 4.8970MHz, compute
new parameter value as the ratio:
4.8970MHz
×
(parameter value at 4.8970MHz)
f
REFOSC
MHz
Note 8:
Series resistance of the resonator (ceramic resonator or crystal) should be minimized to the extent possible. In cases where the resonator
series resistance is too great, the oscillator may oscillate at a diminished peak-to-peak level, or may fail to oscillate entirely. Micrel recom-
mends that series resistances for ceramic resonators and crystals not exceed 50Ohms and 100Ohms respectively. Refer to Application Hint
35 for crystal recommendations.
March 2003
5
MICRF002/RF022
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