TM

1

File Number

4062.8

HFA3524

2.5GHz/600MHz Dual Frequency

Synthesizer

The Intersil 2.4GHz PRISM® chip set is

a highly integrated six-chip solution for

RF modems employing Direct

Sequence Spread Spectrum (DSSS)

signaling. The HFA3524 600MHz Dual

Frequency Synthesizer is one of the six chips in the PRISM

chip set (see the Typical Application Diagram).

The HFA3524 is a monolithic, integrated dual frequency

synthesizer, including prescaler, is to be used as a local

oscillator for RF and first IF of a dual conversion transceiver.

The HFA3524 contains a dual modulus prescaler. A 32/33 or

64/65 prescaler can be selected for the RF synthesizer and a

8/9 or a 16/17 prescaler can be selected for the IF

synthesizer. Using a digital phase locked loop technique, the

HFA3524 can generate a very stable, low noise signal for the

RF and IF local oscillator. Serial data is transferred into the

HFA3524 via a three wire interface (Data, Enable, Clock).

Supply voltage can range from 2.7V to 5.5V. The HFA3524

features very low current consumption of 13mA at 3V.

Features

• 2.7V to 5.5V Operation

• Low Current Consumption

• Dual Modulus Prescaler, 32/33 or 64/65

• Selectable Charge Pump High Z State Mode

Applications

• Systems Targeting IEEE 802.11 Standard

• PCMCIA Wireless Transceiver

• Wireless Local Area Network Modems

• TDMA Packet Protocol Radios

• Part 15 Compliant Radio Links

• Portable Battery Powered Equipment

Functional Block Diagram

Ordering Information

PART

NUMBER

TEMP.

PACKAGE

PKG. NO.

HFA3524IA

-40 to 85

20 Ld TSSOP

M20.173

HFA3524IA96

-40 to 85

Tape and Reel

IF

PRESCALER

15-BIT IF

N COUNTER

15-BIT IF

R COUNTER

15-BIT RF

R COUNTER

18-BIT RF

N COUNTER

OSC

RF

PRESCALER

CHARGE

PUMP

FASTLOCK

LOCK

DETECT

CLOCK

DATA

LE

PHASE

COMP

LD

RF

PHASE

COMP

CHARGE

PUMP

22-BIT DATA

REGISTER

IF

LD

MUX

Data Sheet

March 2000

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

PRISM® is a registered trademark of Intersil Corporation. PRISM logo is a trademark of Intersil Corporation.