Linx Technologies OTX-xxx-HH-LR8-MS - Manual (Page 4)

– – – – 2 3
Ordering Information Theory of Operation
The OTX-***-HH-LR8-MS Long-Range Handheld Transmitter combines an
LR Series transmitter and an antenna with an on-board MS Series encoder
to form a simple, yet highly reliable RF remote-control transmitter. The LR
Series transmitter is a low-cost, high-performance synthesized ASK / OOK
transmitter. The transmitter’s synthesized architecture delivers outstanding
stability and frequency accuracy, while minimizing the effects of antenna
port loading and mismatching. This reduces or eliminates frequency
pulling, bit contraction, and other negative effects that are common to
SAW-based transmitter architectures, providing a significantly higher level
of performance and reliability.
When a button is pressed on the transmitter, power is applied to the
internal circuitry and the encoder is enabled. The encoder then detects
the logic states of the button data lines. These states are formatted into
a 2-word transmission cycle which continues until the button is released.
The encoder data is used to modulate the transmitter which conveys the
data into free space through the antenna. Once data is received, a decoder
IC is used to check the transmitter’s address against an address saved in
memory. If a match is confirmed, the decoder’s outputs are set to replicate
the transmitter’s button states. These outputs can then be used to activate
external circuitry required by the application.
The transmitter is compatible with the LT and LR product families. For
applications where range is critical, the LR Series receiver is the best
choice due to its outstanding sensitivity. When the transmitter is combined
with an LR Series receiver and an MS Series decoder, ranges of up
to 1,000 feet (300m) are possible. Applications operating over shorter
distances also benefit from the increased link reliability and superior noise
immunity provided by the LR Series receiver.
Electrical Specifications
Parameter Designation Min. Typ. Max. Units Notes
Power Supply
Operating Voltage V
CC
2.1 3.0 3.6 VDC
Supply Current l
CC
3.4 mA
Power-Down Current l
PDN
5.0 nA 1
Transmitter Section
Transmit Frequency Range F
C
OTX-315-HH-LR8-MS 315 MHz
OTX-418-HH-LR8-MS 418 MHz
OTX-433-HH-LR8-MS 433.92 MHz
Center Frequency Accuracy –50 +50 kHz
Environmental
Operating Temperature Range –40 +85 °C 1
Electrical Specifications
Ordering Information
Part Number Description
OTX-***-HH-LR8-MS-xxx MS Long-Range Handheld Transmitter
MDEV-***-HH-LR8-MS MS Long-Range Transmitter Master Development System
*** = 315, 418 (Standard) or 433.92MHz
xxx = Custom color, leave blank for black
Figure 3: Ordering Information
1. Characterized, but not tested
Figure 4: Electrical Specifications