LND-TRM33 데이터 시트보기 (PDF) - Linear Dimensions Semiconductor

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LND-TRM33

LOW POWER 300 TO 500 MHz ASK TRANSMITTER

Linear Dimensions Semiconductor 

DATA SHEET

LND TRM33

LOW POWER 300 TO 500 MHz ASK TRANSMITTER

General Description

The LND TRM33 is a low power

Amplitude Shift Keying (ASK)

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 ASK

modulated output. Output power

can be adjusted to a maximum

of 2dBm. The LND TRM33 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,

amplitude 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.

SBY

BYPS

RO1

RO2

VCC

VEE1 VEE2

VSUB

ASK

modulator

crystal

oscillator

divide-

by-

64

VCO

charge

pump

phase

detector

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

Figure 1: Block Diagram

LF

VEE

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