2001-07-25

Page

1

MDST-0013-00

www.vaishali.com

Vaishali Semiconductor

747 Camden Avenue, Suite C

Campbell

CA 95008

Ph. 408.377.6060

Fax 408.377.6063

Applications

•= Set-top boxes

•= MPEG Video clock source

General Description

The Vaishali VT98001 is a single-chip, integrated multiple Phase Locked Loop (PLL) clock synthesizer. The

device uses an analog Phase Locked Loop (PLL) to accept a 27 MHz crystal input to produce multiple

outputs. Selection pins are used to provide various outputs.

Features

•= 24.576 MHz for Firewire IEEE1394 or video

digitizer

•= 24.576 MHz / 28.224 MHz for software or

hardware modem

•= 27 MHz buffered output clock

•= 6.000MHz buffered output clock

•= 18.432 MHz for audio processor

•= 2kHz standby clock

•= Zero ppm synthesis error in all clocks

(except the 2 kHz standby clock)

•= 5V tolerant inputs

•= 20-pin, 150 mil SSOP (QSOP)

Advance Information

VT98001

Multifrequency Synthesizer

Figure 1. Functional Block Diagram

27 MHz

Crystal

24.576/

28.224 MHz

/PD

X1

GND4

27 MHz

27 MHz

GND2 GND3

2kHz

Select

24/28 MHz

X2

ROM Table

osc

VDD2

VDD3

VDD1

24.576 MHz

18.432MHz/

6.000MHz

VDD4

GND5

MODE

GND1

Buffer

Buffer

Buffer

Buffer

Buffer

Buffer

Divider

PLL

Multiplier