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PIN ASSIGNMENTS
NC
D0
D1
NC
NC
A9
A8
A7
A6
D2
GND
VCC
PDN
D3
ANT
GND
1
2
3
4
5
6
7
821
22
23
24
25
26
27
28
D4
DATA
VT
A3
A2
A1
A0
D5
D6
D7
A5
A4
9
10
11
12
13
14
15
16
17
18
19
20
Figure 7: KH Series Receiver Pinout (Top View)
Pin #
Name
Description
1
NC
No Connection. For physical support only.
2, 3, 7, 8,
9, 12, 13,
14
D0-D7
Data Output Lines. Upon a valid transmission, these lines
will be set to replicate the state of the transmitter’s address
lines.
4
GND
Analog Ground
5
VCC
Supply Voltage
6
PDN
Power Down. Pulling this line low will place the receiver into
a low-current state. The module will not be able to receive a
signal in this state.
10
DATA
Data output of the receiver prior to the encoder.
11
VT
Valid Transmission. This line will go high when a valid
transmission is received.
15-24
A0-A9
Address Lines. The state of these lines must match the
state of the transmitter’s address lines in order for a
transmission to be accepted.
25
NC
No Connection. For physical support only.
26
NC
No Connection. For physical support only.
27
GND
Analog Ground
28
RF IN
50-ohm RF Input
PIN DESCRIPTIONS
MODULE DESCRIPTION
The KH Series module combines the popular Linx LC Series receiver with a
decoder IC in a convenient SMD package. The module is ideal for general-
purpose remote control and command applications. When paired with a
matching Linx KH Series transmitter/encoder, a highly reliable RF link is formed,
capable of transferring control and command data over line-of-sight distances in
excess of 300 feet. The on-board receiver/decoder combination provides eight
switched outputs that correspond to the state of the data lines on the
transmitter’s encoder. Ten tri-state address lines are also provided to allow up to
59,049 (310) unique identification codes.
THEORY OF OPERATION
The KH Series receiver module is designed to receive transmissions from a
matching KH Series transmitter module or other compatible Linx transmitter
product. When transmitted data is received, the data is presented to the on-
board decoder. If the incoming address data matches the local address settings,
the decoder’s outputs are set to replicate the states of the transmitter’s data
lines.
The RF section of the KH module utilizes an advanced single-conversion
superhet design that incorporates a Surface Acoustic Wave (SAW) device, high
IF frequency, and multi-layer ceramic filters. The SAW device provides a highly
accurate Local Oscillator (LO) frequency source with excellent immunity to
frequency shift due to age or temperature. The use of SAW devices in both the
KH transmitter and receiver modules allows the receiver’s pass band to be quite
narrow, thus increasing sensitivity and reducing susceptibility to near-band
interference.
Band Select
Filter
pre-
amplifier
AM Detector
SAW Local Oscillator
Gilbert Cell
Mixer/Amp
Limiting Amp
Data Slicer
DATA
50
Ω RF IN
(Ant.)
10.7MHz
Bandpass Filter
10.7MHz
Ceramic Filter
Oscillator
Buffer
Sync.
Detector
Comparator
Comparator
Data
Collector
Divider
8-bit
Shift
Register
D0
D1
D2
D3
D4
D5
D7
D6
Latch
Circuit
AND
Circuit
Buffer
Control
Logic
Transmission Gate Circuit
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9
RF Stage
Decoder Stage
Figure 8: KH Series Receiver Block Diagram
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