MICRF009
QwikRadio® Low-Power UHF Receiver
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
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
Demodulator Bandwidth
Operating Mode
Shutdown
Package
MICRF009BM
User Programmable
Fixed or Sweep
Yes
16-pin SOIC
Typical Application
315Mhz 1200Bps On-Off Keyed Receiver
Fixed Mode
Micrel
MICRF009
January 18, 2005
2
M9999-011805
(408) 955-1690
Pin Configuration
Standard 16-Pin SOIC (M)
Demodulator Bandwidth
SEL0
Sweep-Mode Fixed-Mode
1 1250Hz
2500Hz
0 625Hz
1250Hz
Table 1. Nominal Demodulator Filter Bandwidth vs. SEL0,
Operating Mode at 433.92 MHz
Note:
SEL0 must connect to VDD = 1 or VSS = 0. Do not float SEL0
Pin Description
Pin Number
Pin Name
Pin Function
1 SEL0
Bandwidth Selection Bit 0 (Input): Configure to set the desired demodulator filter bandwidth. See Table
1. 0 = VSS, 1 = VDD, don not float SEL0
2, 3
VSSRF
RF [Analog] Return (Input): Ground return to the RF section power supply. See "Applications
Information" for bypass capacitor details.
4 ANT
Antenna (Input): See "Applications Information" for information on input impedance. For optimal
performance the antenna impedance should be matched to the antenna pin impedance.
5 VDDRF
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.
6 VDDBB
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.
7 CTH
[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.
8 NC
No
connect.
9 VSSBB
Baseband [Digital] Return (Input): Ground return to the baseband section power supply. See
"Applications Information" for bypass capacitor and layout details.
10
DO
Digital Output (Output): CMOS level compatible data output signal.
11 SHUT
Shutdown (Input): Shutdown-mode logic-level control input. Pull low to enable the receiver. This input
has an internal pulled-up to VDDRF.
12 CAGC
AGC Capacitor (External Component): Integrating capacitor for on-chip AGC (automatic gain control).
See "Applications Information" for capacitor selection.
13
SEL1
Bandwidth Selection Bit 1 (Input): Must tie to ground. Reserved for future use.
14 REFOSC2
Reference Oscillator (External Component or Input): Timing reference for on-chip tuning and
alignment.
15 REFOSC1
Reference Oscillator (External Component or Input): Timing reference for on-chip tuning and
alignment.
16 SWEN
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.
Micrel
MICRF009
January 18, 2005
3
M9999-011805
(408) 955-1690
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 Parameter
Condition
Min Typ Max Units
I
OP
Operating Current
continuous operation, f
RF
= 315MHz
2.9
4.5
mA
Polled
with
10:1 duty cycle, f
RF
= 315MHz
290
µA
Continuous operation, f
RF
= 433.92MHz
4.7
7.5
µA
Polled
with
10:1 duty cycle, f
RF
= 433.92MHz
470
µA
I
STBY
Standby Current
V
SHUT
= 0.8VDD
0.15
0.5
µA
RF Section, IF Section
Receiver
Sensitivity(4) f
RF
= 315MHz
102
dBm
f
RF
= 433.92MHz
104
dBm
f
IF
IF Center Frequency
Note 5
0.86
MHz
f
BW
IF 3dB Bandwidth
Note 5
0.68
MHz
Spurious Reverse Isolation
ANT pin, R
SC
= 50
(6)
30
µVrms
AGC Attack to Decay Ratio
t
ATTACK
÷ t
DECAY
0.1
AGC
Leakage
Current T
A
= +85°
±100
nA
Reference Oscillator
Z
REFOSC
Reference Oscillator
Input Impedance
Note 7
290
k
Reference Oscillator Source
Note 8
5.0
µA
Demodulator
Z
CTH
CTH Source Impedance
Note 9
145
k
I
ZCTH(leak)
CTH Leakage Current
T
A
= +85°C
±100
nA
Demodulator Filter
Bandwidth Sweep Mode
(SWEN = V
DD
or OPEN)
(5)
V
SEL0
= V
DD
V
SEL0
= V
SS
1000
500
Hz
Hz
Demodulator Filter Bandwidth
Fixed Mode (SWEN = V
SS
)
(5)
V
SEL0
= V
DD
V
SEL0
= V
SS
2000
1000
Hz
Hz
Micrel
MICRF009
January 18, 2005
4
M9999-011805
(408) 955-1690
Symbol Parameter
Condition
Min Typ Max U
Digital/Control Section
V
IH
Input High Voltage
SEL0, SEL1, SWEN
0.8
V
DD
V
IL
Input Low Voltage
SEL0, SEL1, SWEN
0.2
V
DD
I
OUT
Output Current
DO pin, push-pull
45
µA
V
OH
Output High Voltage
DO pin, I
OUT
= 30µA
0.9
V
DD
V
OL
Output Low Voltage
DO pin, I
OUT
= +30µA
0.1
V
DD
t
R
, t
F
Output Rise and Fall Time
DO pin, C
LOAD
= 15pF
4
µs
Notes:
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 50.
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
9.794MHz
× parameter value at 9.79MHz
(
)
6. Spurious reverse isolation represents the spurious components, which appear on the RF input pin (ANT) measured into 50 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 50 and 100, 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
f
REFOSC
MHZ
× parameter value at 9.794MHz
(
)
Micrel
MICRF009
January 18, 2005
5
M9999-011805
(408) 955-1690
Typical Characteristics
1.5
3.0
4.5
6.0
250
300
350
400
450
500
CURRENT (mA)
FREQUENCY (MHz)
Supply Current
vs. Frequency
T
A
= 25
°
C
V
DD
= 5V
Sweep Mode,
Continuous Operation
1.5
2.0
2.5
3.0
3.5
-40 -20
0
20
40
60
80 100
CURRENT (mA)
TEMPERATURE (
°
C)
Supply Current
vs. Temperature
f = 315MHz
V
DD
= 5V
Sweep Mode,
Continuous Operation
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