ICS149317 datasheet(1/11 Pages) ICST

номер детали	ICS149317

подробное описание детали	Clock Synthesizer for Portable Systems

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производитель	ICST [Integrated Circuit Systems]

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ICS1493-17

MDS 1493-17 A

1

Revision 101005

Integrated Circuit Sy stems

● 5 25 Race Street, San Jo se, CA 9 512 6 ● tel (40 8) 2 97-12 01● www.ics t.co m

Clock Synthesizer for Portable Systems

PRELIM INAR Y INFORMA T ION

Description

The ICS1493-17 is a low-power, low-jitter clock

synthesizer designed to replace multiple crystals and

oscillators in portable audio/video systems. The device

generates a 37 MHz processor clock, a 48 MHz USB

clock, a fixed 22.5792 MHz audio clock, a selectable

24.576 MHz or 22.5792 MHz audio clock, and a 27MHz

reference clock for video. Using ICS’ proprietary mix of

analog and digital Phase-Locked Loop (PLL)

technology, the device spreads the frequency spectrum

of the 37 MHz output, reducing the peak amplitude of

by up to 16 dB. An output enable (OE) pin lowers the

chip power consumption while tri-stating all outputs.

Features

• Extremely low operating current (11 mA)

• Packaged in 20-pin QFN (Pb-free)

• Input crystal or clock frequency of 27 MHz

• Output reference frequency of 27 MHz

• Fixed output frequencies of 37 MHz, 48 MHz and

22.5792 MHz

• Selectable output frequency of either 22.5792 MHz

or 24.576 MHz

• Configurable spread spectrum on 37 MHz output

• Operating core voltage of 1.8 V

• Output voltage of 1.8 V or 2.5 V

• Advanced, low-power CMOS process

Block Diagram

X1

X2

PLL1

(Spread)

PLL2

Crystal

Oscillator/

Clock

Buffer

27 MHz

clock or

crystal input

Optional tuning

capacitors

VDD

GND

27M

37M

3

5

PLL3

22/24M

PLL4

22M

SCK

48M

IIC

Control

Logic

SDATA

OE

VDDO

2

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