Multifrequency Synthesizer
Advance Information
VT98000 Multifrequency Synthesizer
Applications
•= Set-top boxes •= MPEG Video clock source
Genera...
Description
Advance Information
VT98000 Multifrequency Synthesizer
Applications
= Set-top boxes = 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
= = = = 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 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
VT98000
Advance Information
Figure 2. Pin Configuration
VT98000
Select 24/28MHz X2 X1 VDD1 VDD2 GND1 GND2 24.576MHz MODE 24.576MHz/28.224MHz 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 GND5 27MHz 27MHz VDD4 VDD3 GND4 GND3 18.432MHz/6.000MHz /PD 2kHz
Table 1. Pin De...
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