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LND-TRM34

LOW POWER 300 TO 500 MHz FSK TRANSMITTER

Linear Dimensions Semiconductor 

DATA SHEET

LND TRM34

LOW POWER 300 TO 500 MHz FSK TRANSMITTER

General Description

The LND TRM34 is a low power

Frequency Shift Keying (FSK)

transmitter designed to operate

at transmit frequencies between

300 and 500MHz. It is comprised

of a frequency synthesizer and

modulator, which accepts a

simple CMOS digital data input

and generates an FSK

modulated output. Output power

can be adjusted to a maximum

of 2dBm. The LND TRM34 has

been optimized for use in battery-

powered applications with low

current consumption in both

transmit and standby modes.

How Does it Work

Simply connect the supply (as

low as 2.6V), an external

oscillator to RO1 and RO2, and

all ground connections. The chip

converts logic level inputs to

balanced, complimentary,

frequency modulated outputs,

Out1 and Out 2. Output power

can be adjusted using resistor

values in Table 5, and can be

easily switched with logic input

to Standby Mode (extremely low

power) when not transmitting.

Component selections, network,

and antenna options are included

in this document.

VCC

VEE1 VEE2

VSUB

SBY

BYPS

RO1

RO2

crystal

oscillator

divide-

by-

64

VCO

phase

detector

charge

pump

Figure 1: Block Diagram

LF

VEE

Applications

• Wireless office and home

security systems

• Automotive remote locking/starting

• Consumer remote control units

• Radio data transmission

• Low power telemetry

Features

• Low current consumption in

transmit mode

• Low standby current

(typically a few nA)

• Conforms to requirements of

ETSI-300-220, PT1340 and

FCC Part 15

• Easy to use with low external

component count and cost

• No discrete external inductors

required

• Adjustable output power level

PS

OUT2

P.A.

OUT1

buffer

DATA

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