VT83201D Просмотр технического описания (PDF) - Vaishali Semiconductor

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VT83201D

3.3V Low Phase Noise VCXO (Voltage-Controlled Crystal Oscillator) and PLL Clock Synthesizer

Vaishali Semiconductor 

VT83201

3.3V Low Phase Noise VCXO

(Voltage-Controlled Crystal Oscillator)

and PLL Clock Synthesizer

Applications

•= DSL clock source

•= Set-top boxes

•= Telecom switching

•= MPEG Video clock source

•= HDTV

General Description

The Vaishali VT83201 is a single-chip, integrated VCXO and Phase Locked Loop (PLL) clock synthesizer.

The device uses the VCXO and an analog Phase-Locked Loop (PLL) to accept a 10 MHz to 20 MHz, 30pF

(pull range of 200 ppm) crystal input, in order to produce either one or two output clocks. A 0 to 3V control

signal is used to fine tune the output clock frequency in the ±100ppm range. Select inputs S0 and S1 are

used for frequency and output selection.

Features

•= 3.3V supply operation

•= Packaged in 16-pin SOIC package

•= Replaces separate VCXO and multiplier

•= Uses inexpensive pullable crystal

•= On-chip VCXO with 200 ppm pull range (±100 ppm)

•= 5V-tolerant control inputs

•= Zero ppm synthesis error in both

clocks

Figure 1. Functional Block Diagram

VDD1

VDD2

VIN

X2

10-20 MHz

Pullable

Crystal

Load Cap Control

Load

Caps

Low

osc Phase

Noise

PLL

X1

S1:S0

Output

Buffer

CLK1

Output

Buffer

OE

CLK2

2001-04-12

Page 1

MDST-0011-01

www.vaishali.com

Vaishali Semiconductor 747 Camden Avenue, Suite C Campbell CA 95008 Ph. 408.377.6060 Fax 408.377.6063

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