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2
3
Theory of Operation
The OTX-***-HH-LR8-HS Long-Range Handheld Transmitter combines
an LR Series transmitter and an antenna with an on-board HS Series
encoder to form a highly reliable and secure RF remote-control transmitter.
The LR Series transmitter is a low-cost, high-performance synthesized
OOK transmitter. Its 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
an encrypted message that is output to the transmitter module. This
cycle 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 decrypt the
transmitter’s commands. If decryption is successful, 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 HS 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.
Ordering Information
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-HS
315
MHz
OTX-418-HH-LR8-HS
418
MHz
OTX-433-HH-LR8-HS
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-HS-xxx
HS Long-Range Handheld Transmitter
MDEV-***-HH-LR8-HS
HS 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
