Preliminary

ABMX0127

27MHz XO IC with Audio Clock (for Set Top Boxes & MPEG Video)

30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 1

FEATURES

• 27MHz reference output (from 27MHz crystal

input or clock input).

• Selectable Audio Clocks supporting:

8.192MHz, 11.2896MHz, 12.288MHz, and

24.576MHz audio frequencies

• On-the-fly switching of the audio frequency.

• 3.3V Operating Voltage.

• Available in 8-Pin SOIC.

DESCRIPTION

The ABMX0127 is a low cost integrated XO IC

designed to work with a fundamental 27MHz crystal

or a clock input. In addition to a 27MHz clock

reference, it provides the most common audio clocks

(8.192, 11.2896, 12.288, and 24.576MHz) required by

sampling rates of 32kHz, 44.1kHz, 48kHz, 64kHz and

96kHz, making the chip ideal for STB and MPEG

Video applications.

PACKAGE PIN CONFIGURATION

Note: ^: Internal pull-up resistor. The internal pull-up resistor

results in a default high value when no pull-down resistor is

connected to this pin.

AUDIO CLOCK SELECTION

S1

S0

ACLK (MHz)

0

0

8.192

0

1

11.2896

1

0

12.288

1

1

24.576

BLOCK DIAGRAM

Xout

27MHz

Xin

[S1-S0]

Audio

PLL

XO

ACLK

1

2

3

45

6

7

8

XOUT

VDD

GND

27MHz

XIN/FIN

S1^

ACLK

S0^