VT98001 Datasheet, PDF (1/4 Pages) Vaishali Semiconductor – Multifrequency Synthesizer

Advance Information
VT98001
Multifrequency Synthesizer
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)
Figure 1. Functional Block Diagram
VDD1
VDD2
VDD3
VDD4
ROM Table
X2
osc
27 MHz
Crystal
X1
Divider
/PD
Buffer
PLL
Multiplier
Buffer Buffer
Buffer
24.576/
28.224 MHz
Buffer
Select
24/28 MHz
24.576 MHz
Buffer
MODE
18.432MHz/
6.000MHz
2kHz
27 MHz 27 MHz GND1 GND2 GND3 GND4 GND5
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 [phone]