RCR-XXX-HP
Embedding the wireless future..
Low cost 315/418/433.92 MHz Super-Het
ASK/OOK Receiver
Typical Applications
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Remote Keyless Entry (RKE)
Remote Lighting Controls
On-Site Paging
Asset Tracking
Wireless Alarm and Security Systems
Long Range RFID
Automated Resource Management
Features
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Low Cost
150kHz receiving bandwidth
5V operation
4.5mA current drain
No External Parts are required
Small Size: 1.98” x 0.72”
4800 baud operation
Description
The RCR-XXX-HP is ideal for remote control
applications where low cost and longer range are
required. The receiver module requires no external
RF components except for the antenna. It
generates virtually no emissions, making FCC and
ETSI approvals easy.
The super-heterodyne design exhibits exceptional
sensitivity and selectivity. A SAW filter can be
added to the antenna input to improve selectivity
for applications that require robust performance.
The manufacturing-friendly SIP style package and
low-cost make the
RCR-433-HP suitable for high volume applications.
-i-
RCR-XXX-HP Super-Het ASK/OOK Receiver
Data Sheet
Mechanical Drawing
Pinout Diagram
Notes:
1). When designing products with the module, the designer should account for tolerances
in the dimensions of the circuit board.
2). Component location and spacing are subject to change. The designer should not
place any components inside the footprint of the module.
Absolute Maximum Ratings
Rating
Power Supply and All Input Pins
Storage Temperature
Soldering Temperature (10 sec)
Value
-0.3 to +12
-50 to +100
350
Units
VDC
°C
°C
Electrical Characteristics
Characteristic
Operating Voltage
Operating Current
Reception Bandwidth
Center Frequency
Sensitivity
Baud Rate – NRZ
Baud Rate – PWM
Audio Bandwidth
Selectivity
Operating Temperature
Symbol
V
cc
I
cc
BW
rx
F
c
F
c
F
c
None
None
None
BW
audio
None
T
op
Min
4.5
--
--
--
--
--
--
1200
120
.15
-20
Typ
5.0
4.5
150
315
418
433.92
-109
--
--
--
TBD
--
Max
5.5
--
--
--
--
--
--
4800
2400
2.8
+70
Units
VDC
MA
KHz
MHz
MHz
MHz
dBm
bps
Bps
KHz
TBD
°C
Notes
None
None
None
RCR-315-HP
RCR-418-HP
RCR-433-HP
None
None
None
None
TBD
TBD
-2-
11/30/2004
RCR-XXX-HP Super-Het ASK/OOK Receiver
Data Sheet
Pin Description
Pin
1
2
3
4
5
6
Name
GND
DATA
V
cc
(5v)
NC
ANT
GND
Description
Receiver Ground. Connect to ground plane.
Digital data output. This output is capable of driving one TTL or CMOS load. It is a
CMOS compatible output.
Provides operating voltage for the receiver. VCC should be bypassed with a
.01µF ceramic capacitor and filtered with a 4.7µF tantalum capacitor. Noise on the
power supply will degrade receiver sensitivity.
Do Not Connect.
50
Ω
antenna input.
Receiver Ground. Connect to ground plane.
Theory of Operation
Super-Heterodyne AM Detection
The RCR-XXX-HP is a super-heterodyne AM receiver with a built-in data slicer. The incoming AM
carrier is amplified and downconverted to an intermediate frequency (IF) of 10.7MHz. This IF is
filtered using a ceramic bandpass filter with a 150kHz 3dB bandwidth.
The output of the IF filter is then amplified and demodulated using diode detector. The output of
the diode detector is the demodulated AM envelope of the carrier. This signal is applied to the
data slicer to generate the TTL/CMOS output.
Data Slicer
The data slicer converts the baseband analog signal from the diode detector to a CMOS/TTL
compatible output. Because the data slicer is AC coupled to the audio output, there is a minimum
data rate. AC coupling also limits the minimum and maximum pulse width. Typically, data is
encoded on the transmit side using pulse-width modulation (PWM) or non-return-to zero (NRZ).
The most common source for NRZ data is from a UART embedded in a micro-controller.
Applications that use NRZ data encoding typically involve microcontrollers. Refer to the RCR-
XXX-HP designer’s guide for more information on using NRZ data encoding.
The most common source for PWM data is from a remote control IC such as the HC-12E from
Holtek.
Data is sent as a constant rate square-wave. The duty cycle of that square wave will generally be
either 33% (a zero) or 66% (a one). The data slicer on the RCR-XXX-HP is optimized for use with
PWM encoded data, though it will work with NRZ data if certain encoding rules are followed. The
data slicer is designed to drive one(1) TTL or CMOS load. A buffer must be used if the data
output is going to drive more than one TTL/CMOS load or if the load is a lower-impedence
(<100K).
Power Supply
The RCR-XXX-HP is designed to operate from a 5V power supply. It is crucial that this power
supply be very quiet. The power supply should be bypassed using a 0.01uF low-ESR ceramic
capacitor and a 4.7µF tantalum capacitor. These capacitors should be placed as close to the
power pins as possible. The RCR-XXX-HP is designed for continuous duty operation. From the
time power is applied, it can take up to 100mSec for the data output to become
valid.
-3-
11/30/2004
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