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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
S
EL
DATA
R
SS
I
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
V
CC
Supply Voltage
12
LADJ/V
CC
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
200
µS
/div
1
2
PDN
C
a
rrier
Figure 13: TX Turn-On Time from PDN
TYPICAL PERFORMANCE GRAPHS
1. 200mV/div
2. 2.00V/div
1.00m
S
/div
1
2
Vcc
C
a
rrier
Figure 14: TX Turn-On Time from V
CC
1. 200mV/div
2. 2.00V/div
5.00
µS
/div
1
2
DATA
C
a
rrier
Figure 15: TX Turn-Off Time
