Advance Information
VT98000
Multifrequency Synthesizer
Applications
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Set-top boxes
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MPEG Video clock source
General Description
The Vaishali VT98000 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
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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
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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
24.576/
28.224 MHz
X2
Buffer
osc
27 MHz
Crystal
Select
24/28 MHz
PLL
Multiplier
X1
Buffer
24.576 MHz
MODE
18.432MHz/
6.000MHz
Divider
/PD
Buffer
Buffer
Buffer
Buffer
2kHz
27 MHz
27 MHz
GND1 GND2 GND3 GND4 GND5
2001-04-17
Vaishali Semiconductor
Page
1
www.vaishali.com
1300 White Oaks Road Ste. 200 Campbell CA 95008
MDST-0013-00
Ph. 408.377.6060
Fax 408.377.6063
VAISH [ VAISHALI SEMICONDUCTOR ]
