RXM-433-LR_ Linx Technologies Inc, RXM-433-LR_ Datasheet - Page 3

• Manufacturer Part Number: RXM-433-LR_
• Description: RECEIVER 433MHZ LR SERIES
• Manufacturer: Linx Technologies Inc
• Series: LRr

Specifications of RXM-433-LR_

• Frequency: 433MHz
• Sensitivity: -112dBm
• Data Rate - Maximum: 10 kbps
• Modulation Or Protocol: ASK, OOK
• Applications: ISM, Garage Door Openers, RKE
• Current - Receiving: 5mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Features: Long Range
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 70°C
• Package / Case: Non-Standard SMD
• Board Size: 20.6 mm x 16 mm x 3.2 mm
• Minimum Operating Temperature: - 40 C
• Supply Voltage (min): 2.7 V
• Product: RF Modules
• Maximum Frequency: 433.92 MHz
• Supply Voltage (max): 3.6 V
• Maximum Operating Temperature: + 70 C
• Memory Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: RXM-433-LR; RXM-433-LR

PIN ASSIGNMENTS
Figure 7: LR Series Receiver Pinout (Top View)
PIN DESCRIPTIONS
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Pin #
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
Name
DATA
RF IN
RSSI
GND
GND
PDN
V
NC
NC
NC
NC
NC
NC
NC
NC
NC
CC
Received Signal Strength Indicator. This line will supply an
Digital Data Output. This line will output the demodulated
Power Down. Pulling this line low will place the receiver
analog voltage that is proportional to the strength of the
into a low-current state. The module will not be able to
1
2
3
4
5
6
7
8
NC
NC
NC
GND
VCC
PDN
RSSI
DATA
receive a signal in this state.
50-ohm RF Input
GND
Description
received signal.
ANT
Analog Ground
Supply Voltage
Analog Ground
No Connection
No Connection
No Connection
No Connection
No Connection
No Connection
No Connection
No Connection
No Connection
NC
NC
NC
NC
NC
NC
digital data.
16
15
14
13
12
11
10
9
MODULE DESCRIPTION
Figure 8: LR Series Receiver Block Diagram
THEORY OF OPERATION
50Ω RF IN
(Antenna)
The LR receiver is a low-cost, high-performance synthesized AM / OOK receiver,
capable of receiving serial data at up to 10,000bps. Its exceptional sensitivity
results in outstanding range performance. The LR’s compact surface-mount
package is friendly to automated or hand production. LR Series modules are
capable of meeting the regulatory requirements of many domestic and
international applications.
The LR receiver is designed to recover
data sent by an AM or Carrier-Present
Carrier-Absent (CPCA) transmitter, also
referred to as CW or On-Off Keying
(OOK).
represents a logic low ‘0’ by the absence
of a carrier and a logic high ‘1’ by the
presence of a carrier. This modulation
method affords numerous benefits. The
two most important are: 1) cost-effectiveness due to design simplicity and 2)
higher allowable output power and thus greater range in countries (such as the
U.S.) that average output power measurements over time. Please refer to Linx
Application Note AN-00130 for a further discussion of modulation techniques.
The LR receiver utilizes an advanced single-conversion superheterodyne
architecture. Transmitted signals enter the module through a 50-ohm RF port
intended for single-ended connection to an external antenna. RF signals
entering the antenna are filtered and then amplified by an NMOS cascode Low
Noise Amplifier (LNA). The filtered, amplified signal is then down-converted to a
10.7MHz Intermediate Frequency (IF) by mixing it with a low-side Local
Oscillator (LO). The LO frequency is generated by a Voltage Controlled
Oscillator (VCO) locked by a Phase-Locked Loop (PLL) frequency synthesizer
that utilizes a precision crystal reference. The mixer stage incorporates a pair of
double-balanced mixers and a unique image rejection circuit. This circuit, along
with the high IF frequency and ceramic IF filters, reduces susceptibility to
interference. The IF frequency is further amplified, filtered, and demodulated to
recover the baseband signal originally transmitted. The baseband signal is
squared by a data slicer and output to the DATA pin. The architecture and quality
of the components utilized in the LR module enable it to outperform many far
more expensive receiver products.
Band Select
Filter
XTAL
This
LNA
PLL
type
VCO
of
modulation
90˚
0˚
∑
Figure 9: CPCA (AM) Modulation
10.7MHz
IF Filter
Data
Data
Carrier
Carrier
Limiter
+
-
RSSI/Analog
Data Slicer
Data Out
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