RXD-XXX-KH2 Datasheet, PDF (3/11 Pages) List of Unclassifed Manufacturers – KH2 SERIES RECEIVER / DECODER DATA GUIDE

PIN ASSIGNMENTS
1 NC
2 D0
3 D1
4 GND
5 VCC
6 PDN
7 D2
8 D3
9 D4
10 DATA
11 VT
12 D5
13 D6
14 D7
ANT 28
GND 27
NC 26
RSSI 25
A9 24
A8 23
A7 22
A6 21
A5 20
A4 19
A3 18
A2 17
A1 16
A0 15
Figure 7: KH2 Series Receiver Pinout (Top View)
PIN DESCRIPTIONS
Pin # Name
1
NC
Description
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 data
lines.
4
GND
Analog Ground
5
V_CC
Supply Voltage
Power Down. Pulling this line low will place the receiver into
6
PDN 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
26
27
28
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RSSI
Received Signal Strength Indicator. This line will supply an
analog voltage that is proportional to the strength of the
received signal.
NC
GND
RF IN
No Connection. For physical support only.
Analog Ground
50-ohm RF Input
MODULE DESCRIPTION
The KH2 Series module combines the popular Linx LR 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, OEM transmitter, LC, or LR
Series transmitter and Holtek HT640 encoder combination, a highly reliable RF
link is formed, capable of transferring control and command data over line-of-
sight distances in excess of 3,000 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.
50Ω RF IN
(Antenna)
LNA
Band Select
Filter
RF Stage
10.7MHz
0˚
IF Filter
-
∑
+
90˚
Limiter
Data Slicer
Data Out
RSSI/Analog
PLL
VCO
XTAL
Decoder Stage
Oscillator
Buffer
Divider
Data
Collector
D0
8-bit
Shift
Register
Latch
Circuit
AND
Circuit
D1
D2
D3
D4
D5
D6
D7
Buffer
Sync.
Detector
Comparator
Transmission Gate Circuit
Comparator
Control
Logic
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9
Figure 8: KH2 Series Receiver Block Diagram
THEORY OF OPERATION
The KH2 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 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 KH2 module utilizes an advanced single-conversion
superhet design with a synthesized architecture, high IF frequency, and multi-
layer ceramic filters. The exceptional accuracy of the crystal-based synthesized
archetecture in the KH2 receiver module allows the receiver’s pass band to be
quite narrow, thus increasing sensitivity and reducing susceptibility to near-band
interference.
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