MICRF009
QwikRadio® Low-Power UHF Receiver
General Description
The MICRF009 is a single chip, ASK/OOK (ON-OFF
Keyed) RF receiver IC. It provides the same function but
with performance enhancements over earlier QwikRadio
®
receivers. Two key improvements are: higher sensitivity
(typically 6dB higher than the MICRF002) and faster
recovery from shutdown (typically 1ms). Just like all other
members of the QwikRadio
®
family, the MICRF009
achieves low power operation, a very high level of
integration, and it is particularly easy to use.
All post-detection (demodulator) data filtering is provided
on the MICRF009, so no external baseband filters are
required. One of two filter bandwidths may be selected
externally by the user. The user only needs to program the
appropriate filter selection based on the data rate and code
modulation format.
The MICRF009 offer two modes of operation; fixed-mode
(FIX) and sweep-mode (SWP). In fixed-mode the
MICRF009 functions as a conventional superheterodyne
receiver. In sweep-mode the MICRF009 employs a
patented sweeping function to sweep a wider RF spectrum.
Fixed-mode provides better selectivity and sensitivity
performance while sweep mode enables the MICRF009 to
be used with low-cost, imprecise transmitters.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Insert as inline graphic
QwikRadio®
Features
•
•
•
•
•
High sensitivity (–104dBm)
Fast recovery from shutdown (1ms)
300MHz to 440MHz frequency range
Data-rate up to 2.0kbps (fixed-mode, Manchester encoding)
Low power consumption
–
2.9mA fully operational (315MHz)
–
0.15µA in shutdown
–
290µA in polled mode (10:1 duty-cycle)
Shutdown input
Automatic tuning, no manual adjustment
Very low RF re-radiation at the antenna
Highly integrated with extremely low external part count
1ms time to good data
•
•
•
•
•
Applications
•
•
•
•
Automotive remote keyless entry (RKE)
Long range RF identification
Remote fan and light control
Garage door and gate openers
Ordering Information
Part Number
MICRF009BM
Demodulator Bandwidth
User Programmable
Operating Mode
Fixed or Sweep
Shutdown
Yes
Package
16-pin SOIC
Typical Application
315Mhz 1200Bps On-Off Keyed Receiver
Fixed Mode
Power, Connect and Protect is a trademark of Micrel, Inc.
QwikRadio is a registered trademark of Micrel, Inc. The QwikRadio Ics were developed under a partnership agreement with AIT of Orlando, Florida.
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 18, 2005
M9999-011805
(408) 955-1690
Micrel
MICRF009
Pin Configuration
Demodulator Bandwidth
Sweep-Mode
Fixed-Mode
1
1250Hz
2500Hz
0
625Hz
1250Hz
Table 1. Nominal Demodulator Filter Bandwidth vs. SEL0,
Operating Mode at 433.92 MHz
SEL0
Note:
SEL0 must connect to VDD = 1 or VSS = 0. Do not float SEL0
Standard 16-Pin SOIC (M)
Pin Description
Pin Number
1
2, 3
4
5
6
7
Pin Name
SEL0
VSSRF
ANT
VDDRF
VDDBB
CTH
Pin Function
Bandwidth Selection Bit 0 (Input): Configure to set the desired demodulator filter bandwidth. See Table
1. 0 = VSS, 1 = VDD, don not float SEL0
RF [Analog] Return (Input): Ground return to the RF section power supply. See “Applications
Information” for bypass capacitor details.
Antenna (Input): See “Applications Information” for information on input impedance. For optimal
performance the antenna impedance should be matched to the antenna pin impedance.
RF [Analog] Supply (Input): Positive supply input for the RF section of the IC. VDDBB and VDDRF
should be connected together directly at the IC pins.
Baseband [Digital] Supply (Input): Positive supply input for the baseband section of the IC. VDDBB and
VDDRF should be connected together at the IC pins.
[Data Slicing] Threshold Capacitor (External Component): Capacitor extracts the DC average value
from the demodulated waveform, which becomes the reference for the internal data slicing comparator.
See “Applications Information” for selection.
No connect.
Baseband [Digital] Return (Input): Ground return to the baseband section power supply. See
“Applications Information” for bypass capacitor and layout details.
Digital Output (Output): CMOS level compatible data output signal.
Shutdown (Input): Shutdown-mode logic-level control input. Pull low to enable the receiver. This input
has an internal pulled-up to VDDRF.
AGC Capacitor (External Component): Integrating capacitor for on-chip AGC (automatic gain control).
See “Applications Information” for capacitor selection.
Bandwidth Selection Bit 1 (Input): Must tie to ground. Reserved for future use.
Reference Oscillator (External Component or Input): Timing reference for on-chip tuning and
alignment.
Reference Oscillator (External Component or Input): Timing reference for on-chip tuning and
alignment.
Sweep-Mode Enable (Input): Sweep- or fixed-mode operation control input. When SWEN is high, the
MICRF009 is in sweep mode; when SWEN is low, the receiver operates as a conventional single-
conversion superheterodyne receiver. This pin is internally pulled-up to VDDRF.
8
9
10
11
12
13
14
15
16
NC
VSSBB
DO
SHUT
CAGC
SEL1
REFOSC2
REFOSC1
SWEN
January 18, 2005
2
M9999-011805
(408) 955-1690
Micrel
MICRF009
Absolute Maximum Ratings
(1)
Supply Voltage (V
DDRF
, V
DDBB
)................................... +7V
Input/Output Voltage (V
I/O
) ................ V
SS
–0.3 to V
DD
+0.3
Max. Input Power .................................................. +20dBm
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
(2)
Supply Voltage (V
DDRF
, V
DDBB
) ...............+4.75V to +5.5V
Max. Input Power ...................................................... 0dBm
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
(4)
V
DDRF
= V
DDBB
= V
DD
where +4.75V
≤
V
DD
≤
5.5V, V
SS
= 0V; C
AGC
= 4.7µF, C
TH
= 0.022µF; SEL0 = V
DD
; SEL1 = V
SS
; fixed mode
(SWEN = V
SS
); f
REFOSC
= 9.794MHz (equivalent to f
RF
= 315MHz); datarate = 600bps (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
Receiver Sensitivity(4)
f
IF
f
BW
IF Center Frequency
IF 3dB Bandwidth
Spurious Reverse Isolation
AGC Attack to Decay Ratio
AGC Leakage Current
Reference Oscillator
Z
REFOSC
Reference Oscillator
Input Impedance
Reference Oscillator Source
Demodulator
Z
CTH
I
ZCTH(leak)
CTH Source Impedance
CTH Leakage Current
Demodulator Filter
Bandwidth Sweep Mode
(SWEN = V
DD
or OPEN)
(5)
Demodulator Filter Bandwidth
Fixed Mode (SWEN = V
SS
)
(5)
Note 9
T
A
= +85°C
V
SEL0
= V
DD
V
SEL0
= V
SS
V
SEL0
= V
DD
V
SEL0
= V
SS
145
±100
1000
500
2000
1000
kΩ
nA
Hz
Hz
Hz
Hz
Note 7
Note 8
290
5.0
kΩ
µA
V
SHUT
= 0.8VDD
f
RF
= 315MHz
f
RF
= 433.92MHz
Note 5
Note 5
ANT pin, R
SC
= 50Ω
(6)
t
ATTACK
÷ t
DECAY
T
A
= +85°
RF Section, IF Section
–102
–104
0.86
0.68
30
0.1
±100
nA
dBm
dBm
MHz
MHz
µVrms
Min
Typ
2.9
290
4.7
470
0.15
0.5
7.5
Max
4.5
Units
mA
µA
µA
µA
µA
January 18, 2005
3
M9999-011805
(408) 955-1690
Micrel
MICRF009
Symbol
V
IH
V
IL
I
OUT
V
OH
V
OL
t
R
, t
F
Notes:
Parameter
Input High Voltage
Input Low Voltage
Output Current
Output High Voltage
Output Low Voltage
Output Rise and Fall Time
Condition
SEL0, SEL1, SWEN
SEL0, SEL1, SWEN
DO pin, push-pull
DO pin, I
OUT
= –30µA
DO pin, I
OUT
= +30µA
DO pin, C
LOAD
= 15pF
Min
Typ
Max
0.8
U
V
DD
V
DD
µA
V
DD
V
DD
µs
Digital/Control Section
0.2
45
0.9
0.1
4
1. Exceeding absolute maximum ratings may damage the device.
2. The device is not guaranteed to function outside its operating ratings.
3. Devices are ESD sensitive, use appropriate ESD precautions. The device meets Class 1 ESD test requirements, (human body model HBM), in
accordance with MIL-STD-883C, method 3015. Do not operate or store near strong electrostatic fields.
4. 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.
5. Parameter scales linearly with reference oscillator frequency f
T
. For any reference oscillator frequency other than 9.794MHz, compute new
parameter value as the ratio:
f
REFOSC
MHZ
×
(
parameter value at 9.79MHz
)
9.794MHz
6. Spurious reverse isolation represents the spurious components, which appear on the RF input pin (ANT) measured into 50Ω with an input RF
matching network.
7. 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 recommends that
series resistances for ceramic resonators and crystals not exceed 50Ω and 100Ω, respectively.
8. Crystal load capacitor is 10pF. See Figure 5 in “REFOSC” section for reference oscillator operation.
9. Parameter scales inversely with reference oscillator frequency f
T
. For any reference oscillator frequency other than 9.794MHz, compute new
parameter value as the ratio:
9.794MHz
×
(
parameter value at 9.794MHz
)
f
REFOSC
MHZ
January 18, 2005
4
M9999-011805
(408) 955-1690
Micrel
MICRF009
Typical Characteristics
Supply Current
vs. Frequency
6.0
T
A
= 25°C
V
DD
= 5V
CURRENT (mA)
3.5
Supply Current
vs. Temperature
f = 315MHz
V
DD
= 5V
4.5
CURRENT (mA)
3.0
2.5
3.0
Sweep Mode,
Continuous Operation
1.5
250
300
350
400
450
500
2.0
Sweep Mode,
Continuous Operation
1.5
-40 -20
0
20
40
60
80 100
FREQUENCY (MHz)
TEMPERATURE (°C)
January 18, 2005
5
M9999-011805
(408) 955-1690
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