User's Manual

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Ordering Information
Part Number Description
CMD-HHLR-***-xxx-MD Long-Range Handheld Transmitter
EVAL-***-HHLR HHLR Basic Evaluation Kit
*** = 315, 418 (Standard) or 433.92MHz
xxx = Custom color, leave blank for black
Ordering Information
Theory of Operation
The CMD-HHLR-***-MD Long-Range Handheld transmitter combines
the LR Series transmitter and LP Series antenna with an on-board DS
Series encoder IC 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 IC is enabled. The encoder detects the
logic states of the address lines and button data lines. These states are
formatted into a three-word transmission cycle that continues until the
button is released. The encoder data is used to modulate the transmitter,
which, through the antenna, conveys the data into free space. On the
receiver side, a decoder IC or custom microcontroller is used to check
the transmitter’s address bits against the address settings of the receiving
device. 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 several Linx receiver products, including
the LR, KH2, KH3, LT and OEM 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 the DS Series decoder, ranges of up to 1,000 feet are
possible. Applications operating over shorter distances will 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
CMD-HHLR-315-MD 315 MHz
CMD-HHLR-418-MD 418 MHz
CMD-HHLR-433-MD 433.92 MHz
Center Frequency Accuracy –50 +50 kHz
Environmental
Operating Temperature Range –40 +85 °C 1
Electrical Specications
1. Characterized, but not tested
Figure 3: Ordering Information
Figure 4: Electrical Specifications