ICST MK1412STR, MK1412A, MK1412ATR, MK1412S Datasheet

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ICST MK1412STR, MK1412A, MK1412ATR, MK1412S Datasheet

MK1412

MPEG Audio Clock Synthesizer

Description

The MK1412 is the ideal way to generate clocks for MPEG audio devices in computers. The device uses ICS/MicroClock’s proprietary mixture of analog and digital Phase-Locked Loop (PLL) technology to synthesize one of eight frequencies (four on each output) from the 14.31818 MHz reference. In an 8 pin SOIC, the MK1412 can save component count, board space, and cost over crystals and oscillators, and increase reliability by eliminating three expensive mechanical devices from the board.

We offer many other clocks for computers and computer peripherals. Consult us when you need to remove crystals and oscillators from your board.

Due to a long lead time in the original wafer fab that makes the MK1412S, we have retooled the die and now call the part the MK1412A. All functional parameters are the same as or better than the original part.

Features

• Packaged in 8 pin SOIC

Input crystal or clock frequency of 14.31818 MHz

Provides master MPEG clocks for 32 kHz, 44.1 kHz, 48 kHz and 96 kHz sampling rates

Output clock frequencies of 256x and 512x of the audio sampling rates compatible with most DACs

Low jitter

Full CMOS output swing with 25mA drive capability at TTL levels

3.3V or 5V±10% supply voltage

Advanced, low power CMOS process

The A version is the newest version in a more advanced manufacturing process

Block Diagram

 

 

 

VDD GND

 

 

 

2

 

Output

CLK

S1, S0

 

Buffer

PLL

 

 

 

 

14.31818 MHz

Clock Synthesis

÷ 2

 

and Control

 

crystal or clock

 

 

Circuitry

 

 

X1

 

 

 

Output

 

Crystal

 

CLK/2

 

Buffer

Oscillator

 

 

 

X2

 

 

 

MDS 1412 B 1 Revision 060200 Printed 11/15/00

Integrated Circuit Systems, Inc.• 525 Race Street• San Jose • CA • 95126• (408)295-9800tel •www.icst.com

 

 

 

 

 

 

 

 

 

 

 

 

 

MK1412

 

 

 

 

 

 

 

 

 

 

MPEG Audio Clock Synthesizer

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pin Assignment

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Audio Clock Outputs Select Table (MHz)

 

X1

 

1

 

8

 

X2

 

 

 

 

 

 

 

 

 

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S1

S0

CLK

CLK/2

Accuracy

 

 

 

VDD

 

2

 

 

CLK

 

 

 

 

GND

 

3

 

6

 

S1

0

0

16.384

8.192

1 ppm

 

 

 

 

 

 

0

1

22.5792

11.2896

25 ppm

 

 

 

 

 

 

CLK/2

 

4

 

5

 

S0

1

0

24.576

12.288

1 ppm

 

 

 

 

 

 

 

 

 

 

1

1

49.152

24.576

1 ppm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8 pin SOIC

Pin Descriptions

Number

Name

Type

Description

 

1

X1

I

Crystal Connection. Connect to a 14.31818 MHz crystal or clock.

 

2

VDD

P

Connect to +3.3V or +5V.

 

3

GND

P

Connect to ground.

 

4

CLK/2

O

Audio Clock divide by 2 output as per table above.

 

5

S0

I

Frequency Select 0 Input. Determines CLK and CLK/2 outputs as per table above.

 

6

S1

I

Frequency Select 0 Input. Determines CLK and CLK/2 outputs as per table above.

 

7

CLK

O

Audio Clock output as per table above.

 

8

X2

O

Crystal Connection to a 14.31818 MHz crystal, or leave unconnected for clock input.

 

Key: I = Input, O = output, P = power supply connection

External Components/Crystal Selection

A minimum number of external components are required for proper oscillation. For a crystal input, one load capacitor can be connected to each of the X1 and X2 pins and ground, and a parallel resonant 14.31818 MHz crystal is recommended. The value (in pF) of each crystal load capacitor should equal (CL-18)*2, where CL is the crystal’s load (correlation) capacitance in pF. So for crystals with 18 pF load capacitance (or less), no extra capacitors are needed. The frequency tolerance of the crystal should be 50ppm or better. For a clock input, connect to X1 and leave X2 unconnected. A decoupling capacitor of 0.1µF should be connected between VDD and GND on pins 2 and 3, and 33Ω terminating resistor may be used on the clock outputs if the trace is longer than 1 inch.

MDS 1412 B 2 Revision 060200 Printed 11/15/00

Integrated Circuit Systems, Inc.• 525 Race Street• San Jose • CA • 95126• (408)295-9800tel •www.icst.com

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