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MODULE DESCRIPTION

The LT Series transceiver is a low-cost, high-performance synthesized AM /

OOK transceiver, capable of transmitting and receiving serial data at up to

10,000bps over line-of-site distances of up to 3,000 feet. Its exceptional receiver

sensitivity and highly stable transmitter output result in outstanding range

performance. The transceiver is completely self-contained and does not require

any additional RF components (except an antenna). This greatly simplifies the

design process, reduces time to market, and reduces production assembly and

testing costs. The LT is housed in a compact surface-mount package that

integrates easily into existing designs and is equally friendly to prototyping and

volume production. The module’s low power consumption makes it ideal for

battery-powered products.

PIN ASSIGNMENTS

ANT

GND

NC

GND

PDN

T/R SEL

DATA

RSSI

A REF

ANALOG

LADJ

VCC

1

2

3

4

5

6

7

8

9

10

11

12

Figure 16: LT Series Transceiver Pinout (Top View)

Pin #

Name

Description

1

ANT

50-ohm RF Port

2

GND

Analog Ground

3

NC

No Connection

4

RSSI

Received Signal Strength Indicator. This line will supply an

analog voltage proportional to the received signal strength.

5

A REF

Analog RMS (Average) Voltage Reference

6

ANALOG

Recovered Analog Output

7

DATA

Digital Data Line. This line will output the received data

when in Receive Mode and is the data input when in

Transmit Mode.

8

T/R SEL

Transmit / Receive Select. Pull this line low to place the

transceiver into receive mode. Pull it high to place it into

transmit mode.

9

PDN

Power Down. Pull this line low or leave floating to place the

receiver into a low-current state. The module will not be

able to send or receive a signal in this state. Pull high to

activate the transceiver.

10

GND

Analog Ground

11

Supply Voltage

12

Level Adjust. This line can be used to adjust the output

power level of the transmitter. Connecting to VCC will give

the highest output, while placing a resistor to VCC will

lower the output level (see Figure 3).

PIN DESCRIPTIONS

Table 2: LT Series Transceiver Pin Descriptions

1. 200mV/div

2. 2.00V/div

200µS/div

1

2

PDN

Carrier

Figure 13: TX Turn-On Time from PDN

TYPICAL PERFORMANCE GRAPHS

1. 200mV/div

2. 2.00V/div

1.00mS/div

1

2

Vcc

Carrier

1. 200mV/div

2. 2.00V/div

5.00µS/div

1

2

DATA

Carrier

Figure 15: TX Turn-Off Time