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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

N/C

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

N/C

No Connection. For physical support only.

26

N/C

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 capable of

transferring control and command over line-of-sight distances in excess of 300

feet (90m) is formed. 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 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 opening 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

10 Transmission Gate Circuit

A0 A1 A2 A3 A4 A5 A6 A7 A8 A9

RF Stage

Decoder Stage

Figure 8: KH Series Receiver Block Diagram