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MICRF004/RF044
Micrel
MICRF004
QwikRadio™ Low-Power VHF Receiver
Final Information
General Description
The MICRF004 QwikRadio™ VHF receiver is a single-chip
OOK (on-off keyed) receiver IC for remote wireless applica-
tions. This device is a true single-chip, “antenna-in, data-out”
device. All RF and IF tuning is accomplished automatically
within the IC which eliminates manual tuning production
costs and results in a highly reliable, extremely low-cost
solution for high-volume wireless applications.
The MICRF004 is extremely easy to apply, minimizing design
and production costs, and improving time to market. The
MICRF004 provides two fundamental modes of operation,
fixed and sweep.
In fixed mode, the device functions as a conventional super-
heterodyne receiver with an internal local oscillator operating
at a single frequency based on an external reference crystal
or clock. Fixed mode is for use with accurately-controlled
transmitters utilizing crystal or SAW (surface acoustic wave)
resonators.
In sweep mode, the MICRF004 sweeps the internal local
oscillator at rates greater than the baseband data rate. This
effectively broadens the RF bandwidth of the receiver to a
value equivalent to conventional superregenerative receiv-
ers. This allows the MICRF004 to operate with less expensive
LC transmitters without additional components or tuning,
even though the receiver topology is still superheterodyne. In
this mode the reference crystal can be replaced with a less
expensive
±0.5%
ceramic resonator.
The MICRF004 features a shutdown control, which may be
used for duty-cycled operation, and a wake-up output, which
provides a logical indication of an incoming RF signal. These
features make the MICRF004 ideal for low- and ultra-low-
power applications, such as RKE (remote keyless entry) and
RFID (RF identification).
Since all post-detection (demodulator) data filtering is pro-
vided on the MICRF004, no external filters are required. One
of the four internal filter bandwidths must be externally
selected based on data rate and code modulation format.
Bandwidths range in binary steps, from 0.55kHz to 4.4kHz
(sweep mode) or 1.1kHz to 8.8kHz (fixed mode).
Features
•
•
•
•
•
•
•
•
•
•
•
•
Complete VHF receiver on a monolithic chip
140MHz to 200MHz frequency range
>200 meters typical range with monopole antenna
2.5kb/s sweep- and 10kb/s fixed-mode data rates
Automatic tuning, no manual adjustment
No filters or inductors required
Low 240µA operating supply current at 150MHz
(10:1 duty cycle)
Shutdown mode for >100:1 duty-cycle operation
Wakeup for enabling decoders and microprocessors
Very low RF antenna reradiation
CMOS logic interface for standard ICs
Extremely low external part count
Applications
•
•
•
•
Automotive remote keyless entry
Long range RF identification
Remote fan and light control
Garage door and gate openers
Ordering Information
Part Number
MICRF004BM
MICRF004BN
Junction Temp. Range
–40°C to +85°C
–40°C to +85°C
Package
16-Lead SOP
16-Pin DIP
8-pin versions available. See “Custom 8-Pin Options,” following page.
Typical Application
MICRF004
SEL0
SEL0
VSSRF
VSSRF
+5V
ANT
VDDRF
VDDBB
CTH
0.047µF
NC
4.85MHz
SWEN (ceramic resonator)
REFOSC
SEL1
CAGC
WAKEB
SHUT
DO
VSSBB
Data
Output
4.7µF
150MHz 1200b/s 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
February 9, 2000
1
MICRF004/RF044
MICRF004/RF044
Micrel
Pin Configuration
SEL0 1
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
16-Pin DIP (N) or SOP (M) Packages
MICRF004
2
February 9, 2000
MICRF004/RF044
Micrel
Pin Description
Pin Number
16-Pin Pkg.
1
2, 3
4
1
2
Pin Number
8-Pin Pkg.
Pin Name
SEL0
VSSRF
ANT
Pin Function
Bandwidth Selection Bit 0 (Input): Configure with SEL1 to set the desired
demodulator filter bandwidth. See Table 1. Internally pulled-up to VDDRF.
RF [Analog] Return (Input): Ground return to the RF section power supply.
See “Application Information” for bypass capacitor details.
Antenna (Input): High-impedance, internally ac coupled receiver input.
Connect this pin to the receive antenna. This FET gate input has approxi-
mately 2pF of shunt (parasitic) capacitance. See “Applications Information”
for optional band-pass filter information.
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. Connect a low ESL, low ESR decoupling capacitor from this pin to
VSSRF, as short as possible.
Base-Band [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 “Appli-
cations Information” for selection.
not internally connected
Base-Band [Digital] Return (Input): Ground return to the baseband section
power supply. See “Application 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.
Wakeup (Output): Active-low output that indicates detection of an incoming
RF signal. Signal is determined by monitoring for data preamble. CMOS-
level compatible.
AGC Capacitor (External Component): Integrating capacitor for on-chip
AGC (automatic gain control). The decay/attack time-constant (τ) ratio is
nominally 10:1. See “Applications Information” for capacitor selection.
Bandwidth Selection Bit 1 (Input): Configure with SEL0, programs to set the
desired demodulator filter bandwidth. See Table 1. Internally pulled-up to
VDDRF.
Reference Oscillator (External Component or Input): Timing reference for
on-chip tuning and alignment. Connect either a ceramic resonator or crystal
(mode dependent, see “Application Information”). between this pin and
VSSBB, or drive the input with an ac-coupled 0.5Vpp input clock.
Sweep-Mode Enable (Input): Sweep- or fixed-mode operation control input.
When VSWEN is high, the MICRF004 is in sweep mode; when SWEN is
low, the receiver operates as a conventional single-conversion superhetero-
dyne receiver. This pin is internally pulled-up to VDDRF.
5
3
VDDRF
6
VDDBB
7
4
CTH
8
9
NC
VSSBB
10
11
12
5
6
DO
SHUT
WAKEB
13
7
CAGC
14
SEL1
15
8
REFOSC
16
SWEN
February 9, 2000
3
MICRF004/RF044
MICRF004/RF044
Micrel
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
DDRF
, V
DDBB
) .................................... +7V
Reference Oscillator Input Voltage (V
REFOSC
) .......... V
DDBB
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
Ambient Temperature (T
A
) ......................... –40°C to +85°C
Package Thermal Resistance (θ
JA
)
16-pin DIP (θ
JA
) ................................................... 90°C/W
16-pin SOIC (θ
JA
) .............................................. 120°C/W
Electrical Characteristics
V
DDRF
= V
DDBB
= V
DD
where +4.75V
≤
V
DD
≤
5.5V, V
SS
= 0V; C
AGC
= 4.7µF, C
TH
= 0.047µF; f
REFOSC
= 4.65MHz; 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
I
STBY
Parameter
Operating Current
Condition
continuous operation
10:1 duty cycle
Standby Current
V
SHUT
= V
DD
Notes 4, 6
Note 7
Notes 6, 7
145
f
IN
= 150MHz
20
R
SC
= 50Ω
ANT pin, R
SC
= 50Ω,
Note 5
t
ATTACK
÷
t
DECAY
T
A
= +85°C
extermal reference (250mV peak)
ceramic resonator
crystal
Z
REFOSC
Reference Oscillator
Input Impedance
Reference Oscillator
Input Sensitivity
I
REFOSC
Demodulator
Z
CTH
∆Z
CTH
I
ZCTH(leak)
CTH Source Impedance
CTH Source Impedance Variation
CTH Leakage Current
Demodulator Filter Bandwidth
Demodulator Filter Bandwidth
T
A
= +85°C
V
SEL0
= V
SEL1
= V
SWEN
= V
DD
,
Notes 7, 9
V
SEL0
= V
SEL1
= V
DD
, V
SWEN
= V
SS
,
Note 7, 9
Note 8
124
±15
±200
3960
7930
kΩ
%
nA
Hz
Hz
Reference Oscillator Current
Note 10
0.1
4.5
6
5
10
290
2
–20
30
0.1
±200
nA
422
80
Min
Typ
2.4
240
0.35
Max
Units
mA
µA
µA
RF Section, IF Section
Receiver Sensitivity
f
IF
f
BW
f
ANT
Z
IN(ant)
IF Center Frequency
IF 3dB Bandwidth
RF Input Range
Antenna Input Impdeance
Receive Modulation Duty-Cycle
Maximum Receiver Input
Spurious Reverse Isolation
AGC Attack to Decay Ratio
AGC Leakage Current
Reference Oscillator
Reference Oscillator
Stabilization Time
ms
ms
ms
kΩ
Vp-p
µA
–80
0.86
0.43
200
dBm
MHz
MHz
MHz
Ω
%
dBm
µVrms
MICRF004
4
February 9, 2000
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