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July 2005

FS8170 2.5 GHz Low Power Phase-locked Loop IC

Princeton Technology Corp. reserves the right to change the product described in this datasheet. All information con-

tained in this datasheet is subject to change without prior notice. Princeton Technology Corp. assumes no responsibility

for the use of any circuits shown in this datasheet.

Description

The FS8170 IC is a serial data input, fully programmable phase-locked loop with a 2.5

GHz prescaler for use in the local oscillator subsystem of radio transceivers. Multi-modu-

lus division ratios of 32/33 and 64/65 are selectable thru serial programming to enable

pulse swallowing operation. When combined with an external VCO, the FS8170 becomes

the core of a very low power frequency synthesizer well-suited for mobile communication

applications, such as 2.4 GHz ISM-band wireless data links and cellular GSM and PCS.

The FS8170 is also pin compatible with Fujitsu’s MB15E07SL IC.

Features

Maximum input frequency: 2.5 GHz

Supply voltage range from 2.4 V to 3.6 V

Low current consumption in locked state: 3.5 mA typ. (V

4.0 mA typ. (V

10

µA max. in asynchronous power-down mode

Digitally-filtered lock detect output

18-bit programmable input frequency divider using ÷ 32/33/64/65 multi-modulus prescaler with divide ratio range

from 992 to 65631 for ÷ 32/33 mode and from 4032 to 131135 for ÷ 64/65 mode

14-bit programmable reference frequency divider with divide ratio range from 3 to 16383

Programmable charge pump current: 1.5 mA or 6 mA

Pin compatible with Fujitsu MB15E07, MB15E07L, MB15E07SL

16 pin, plastic TSSOP (0.65 mm pitch)

Package and Pin Assignment

16 pin, plastic TSSOP (dimensions in mm)

XIN

XOUT

VP

VCC

DO

VSS

XFIN

FIN

φR

φP

FOLD

ZC

EN

LE

DATA

CLK

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9