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PIN ASSIGNMENTS
MODULE DESCRIPTION
The KH2 Series transmitter / encoder module combines a high-performance
1
LADJ/GND ANT
24
Surface Acoustic Wave (SAW) based transmitter with an on-board encoder.
2
D0
GND
2 3
When combined with a Linx KH2 Series receiver / decoder, a highly reliable RF
3
D1 A9
22
link capable of transferring control or command data over line-of-sight distances
4
5
6
7
8
9
10
GND
VCC
TE
D2
D 3
D4
D5
A 8
A7
A6
A5
A4
A 3
A2
21
20
19
1 8
17
16
15
of up to 3,000 feet is formed. The module accepts up to 8 parallel inputs, such
as switches or contact closures, and provides ten tri-state address lines for
security and creation of 59,049 (3 10 ) unique transmitter / receiver relationships.
The KH’s compact surface-mount package integrates easily into existing designs
and is friendly to hand production or automated assembly.
Address Inputs
11
12
D6 A1
D7 A0
14
1 3
SAW
TX Enable
A0-A 9
Figure 6: KH2 Series Transmitter Pinout (Top View)
50 Ω RF OUT
(ANT)
Oscillator
Divider
OSC
Parallel
Inputs
D0-D7
Keyed Output
Counter
PIN DESCRIPTIONS
TRI-Detect
Pin #
Name
Description
Output Isolation
& Filter
RF Amplifier
1
2, 3,
7-12
4
5
GND / LADJ
D0 - D1
GND
V CC
Level Adjust. This line can be used to adjust the output
power level of the transmitter. Connecting to GND will give
the highest output, while placing a resistor to GND will
lower the output level.
Data Input Lines. When TE goes high, the module will
encode the state of these lines for transmission. Upon
receipt of a valid transmission, the receiver / decoder will
replicate these lines on its output lines.
Analog Ground
Supply Voltage
RF STAGE ENCODER STAGE
Figure 7: KH2 Series Transmitter Block Diagram
THEORY OF OPERATION
The KH2 Series transmitter operation is straightforward. When the Transmit
Enable (TE) line is taken high, the on-board encoder IC is activated. The encoder
detects the logic states of the data and address lines. These states are formatted
into a 3-word transmission, which continues until the TE line is taken low. The
encoder creates a serial data packet that is used to modulate the transmitter.
The transmitter section is based on a simple, but highly-optimized, architecture
that achieves a high fundamental output power with low harmonic content. This
Transmit Enable Line. When this line goes high, the
ensures that most approval standards can be met without external filter
6
TE
module will encode the states of the address and data lines
into a packet and transmit the packet three times.
components. The KH2 Series transmitter is exceptionally stable over variations
in time, temperature, and physical shock as a result of the precision SAW device
that is incorporated as the frequency reference.
13-22
23
24
Page 4
A0-A9
GND
ANT
Address Lines. The state of these lines must match the
state of the receiver’s address lines in order for a
transmission to be accepted.
Analog Ground
50-ohm RF Output
The transmitted signal may be received by a Linx KH2 Series receiver / decoder
module or a Linx LR Series receiver combined with the appropriate decoder IC.
Once data is received, it is decoded using a decoder IC or custom
microcontroller. The transmitted address bits are checked against the address
settings of the receiving device. If a match is confirmed, the decoder’s outputs
are set to replicate the transmitter’s inputs.
Page 5
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