FEATURES

s Low supply Current

s Power down feature

s Adjustable output power level

s Low external part count

s Fully integrated VCO, PLL and Power Amplifier

Figure.2 block diagram

ORDERING INFORMATION

KESTX01/IG/MPAD (Tape and Reel)

KESTX01/IG/MPAS (Tubes)

The KESTX01 is a single chip ASK (Amplitude Shift Key)

transmitter IC. It is designed to operate in a variety of low

power radio applications including keyless entry, general

domestic and industrial remote control, RF tagging and local

paging systems.

The transmitter offers a high level of integration and per-

formance, which enables the harmonic rejection and funda-

mental power requirements of the ESTI 300 220, and

other governing bodies, to be met.

The basic architecture utilises a crystal reference oscilla-

tor, an integrated frequency multiplying PLL and a power

output stage. The design is centred around the popular

433.92MHz operating frequency and particular emphasis has

been placed on low current drain, including a power–down

feature which greatly increases battery life.

ABSOLUTE MAXIMUM RATINGS

Junction temperature

-55 to +150

°C

Storage temperature

-55 to +150

°C

Supply voltage

V

Voltage on any pin

V

Notes:

1. The voltage on pin OUT and OUTB (open collector outputs)

can support a higher voltage than this (+14V)

MP14

Figure.1 Pin connections - top view

TXEN

XTAL

OSCILLATOR

XTAL1 XTAL2

LF

VCC

PLL POWER SUPPLY

1

64

PHASE

DETECTOR

VCO

VCC

PWRC

DATA

OUT

OUT B

VEE

VEE

2

1

LF1

VCOTST

VCCPA

KESTX01

400MHz - 460MHz ASK Transmitter

Preliminary Information

Supersedes September 1996 version, DS4548 - 2.0

DS3969 - 3.8 August 1998

XTAL2

PWRC

DATA

OUTB

OUT

VCCPA

VEE2

11

4

8

7

XTAL1

VCOTST

VEE1

LF

LF1

TXEN

VCC

.