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© Analog Devices, Inc., 2002

ADF7010

High Performance ISM Band

ASK/FSK/GFSK Transmitter IC

FEATURES

Single Chip Low Power UHF Transmitter

902 MHz–928 MHz Frequency Band

On-Chip VCO and Fractional-N PLL

2.3 V–3.6 V Supply Voltage

Programmable Output Power

–16 dBm to +12 dBm, 0.3 dB Steps

Data Rates up to 76.8 kbps

Low Current Consumption

28 mA at 8 dBm Output

Power-Down Mode (<1

A)

24-Lead TSSOP Package

APPLICATIONS

Low Cost Wireless Data Transfer

Wireless Metering

Remote Control/Security Systems

Keyless Entry

FUNCTIONAL BLOCK DIAGRAM

VCO

OOK/ASK

LDO

REGULATOR

MUXOUT

LOCK DETECT

SERIAL

INTERFACE

FREQUENCY

COMPENSATION

CENTER

FREQUENCY

FRACTIONAL N

SIGMA-DELTA

OOK/ASK

PFD/

CHARGE

PUMP

R

CLK

PA

FSK/GFSK

OSC1

OSC2

MUXOUT

TEST

CE

CLK

DATA

LE

TxDATA

TxCLK

GENERAL DESCRIPTION

The ADF7010 is a low power OOK/ASK/FSK/GFSK UHF

transmitter designed for use in ISM band systems. It contains

an integrated VCO and sigma-delta fractional-N PLL. The

output power, channel spacing, and output frequency are pro-

grammable with four 24-bit registers. The fractional-N PLL

enables the user to select any channel frequency within the U.S.

902 MHz–928 MHz band, allowing the use of the ADF7010 in

frequency hopping systems.

It is possible to choose from the four different modulation

schemes: Binary or Gaussian Frequency Shift Keying (FSK/

GFSK), Amplitude Shift Keying (ASK), or On/Off Keying

(OOK). The device also features a crystal compensation register

that can provide

1 ppm resolution in the output frequency.

Indirect temperature compensation of the crystal can be accom-

plished inexpensively using this register.

Control of the four on-chip registers is via a simple 3-wire inter-

face. The devices operate with a power supply ranging from

2.3 V to 3.6 V and can be powered down when not in use.