Datasheet MK2731-04S, MK2731-04STR Datasheet (ICST)

PRELIMINARY INFORMATION

compatible with every popular audio DAC

• Zero ppm synthesis error

• 25 mA output drive capability at TTL levels

• Advanced, low power, sub-micron CMOS process

MK2731-04C

MPEG Audio Clock

Description

The MK2731-04 is a low cost, low jitter, high
performance clock synthesizer designed to replace
expensive discrete clock oscillators in MPEG audio
applications. Using ICS/MicroClock’s patented
analog/digital Phase-Locked Loop (PLL)
techniques, the device uses an inexpensive

14.4 MHz crystal input to produce all of the
popular audio sampling frequencies.

ICS manufactures the largest variety of Set-Top
Box and multimedia clock synthesizers for all
applications. Consult ICS to eliminate VCXOs,
crystals and oscillators from your board.

Features

• Packaged in 16 pin narrow SOIC

• Replaces multiple oscillators

• 3.3V or 5V operation

• Uses an inexpensive 14.4 MHz crystal

• Supports 32 kHz, 44.1 kHz, 48 kHz, and 96 kHz
audio sampling rates

• Has 256x, 384x, and 512x sampling rates -

Block Diagram

3

S2:S0

X1

14.40 MHz
crystal

X2

MDS 2731-04 CA 1 Revision 122799 Printed 11/16/00

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • [phone]tel • www.icst.com

Crystal

Oscillator

VDD GND
3 3

PLL/Clock

Synthesis
Circuitry

÷ 2

Output

Buffer

Output

Buffer

CLK2

CLK1

PRELIMINARY INFORMATION

MK2731-04C

MPEG Audio Clock

Pin Assignment

Output Clocks Select Table (MHz)

MK2731-04

16

X2
X1

VDD

VDD

GND

GND
GND

S2

1
2

3
4
5
6
7
8

16 pin narrow (150 mil) SOIC

15
14

13
12

11
10

DC

DC

S0

S1
DC

CLK2

VDD

CLK1

9

S2 S1 S0 CLK1 CLK2

Pin 8 Pin 13 Pin 14 Pin 9 Pin 11

0 0 0 16.9344 33.8688
0 0 1 11.2896 22.5792
0 1 0 8.192 16.384
0 1 1 18.432 36.864
1 0 0 11.2896 22.5792
1 0 1 12.288 24.576
1 1 0 Test Test
1 1 1 Test Test

Key: 0 = connect directly to GND

1 = connect directly to VDD

Pin Descriptions

Number Name Type Description

1 X2 XO Crystal connection. Connect to a parallel mode 14.4 MHz crystal.
2 X1 XI Crystal connection. Connect to a parallel mode 14.4 MHz crystal.

3, 4, 10 VDD P Connect to +3.3V or +5V. Must be same at all VDDs.

5, 6, 7 GND P Connect to ground.

8 S2 I Frequency select pin 2. Determines clock outputs per table above.
9 CLK1 O Clock output 1 set by status of S0-S2. See table above. This output is CLK2/2

11 CLK2 O Clock output 2 set by status of S0-S2. See table above.

12, 15, 16 DC - Don't Connect. Do not connect anything to these pins.

13 S1 I Frequency select pin 1. Determines clock outputs per table above.
14 S0 I Frequency select pin 0. Determines clock outputs per table above.

Key: I = Input with internal pull-up resistor; O = output; P = power supply connection; XI, XO = crystal
connections

External Components

The MK2731-04 requires a minimum number of external components for proper operation. Decoupling
capacitors of 0.01µF should be connected between VDD and GND on pins 3 and 5, and VDD and GND
on pins 10 and 6, as close to the MK2731-04 as possible. Other VDDs can be connected to pin 10. A series
termination resistor of 33 Ω may be used for each clock output. Any unused clock outputs should be left
unconnected (DC, floating). The input crystal must be connected as close to the chip as possible. The input
crystal should be fundamental mode, parallel resonant. For accurate outputs, the crystal should be tuned
with two identical capacitors to ground, as shown on the block diagram. The value of these two crystal caps
should be equal to (CL-6)*2, where CL is the crystal load (or correlation) capacitance.

MDS 2731-04 CA 2 Revision 122799 Printed 11/16/00

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • [phone]tel • www.icst.com

PRELIMINARY INFORMATION

ABSOLUTE MAXIMUM RATINGS (note 1)

DC CHARACTERISTICS (VDD = 3.3V unless noted)

AC CHARACTERISTICS (VDD = 3.3V unless noted)

exposure to levels above the operating limits but below the Absolute Maximums may affect device reliability.

MK2731-04C

MPEG Audio Clock

Electrical Specifications

Parameter Conditions Minimum Typical Maximum Units

Supply voltage, VDD Referenced to GND 7 V
Inputs and Clock Outputs Referenced to GND -0.5 VDD+0.5 V
Ambient Operating Temperature 0 70 °C
Soldering Temperature Max of 10 seconds 260 °C
Storage temperature -65 150 °C

Operating Voltage, VDD 3.00 5.0 5.50 V
Input High Voltage, VIH, X1 pin only (VDD/2)+1 VDD/2 V
Input Low Voltage, VIL, X1 pin only VDD/2 (VDD/2)-1 V
Input High Voltage, VIH 2 V
Input Low Voltage, VIL 0.8 V
Output High Voltage, VOH IOH=-12mA 2.4 V
Output Low Voltage, VOL IOL=12mA 0.4 V
Output High Voltage, VOH, CMOS level IOH=-4mA VDD-0.4 V
Operating Supply Current, IDD No Load 10 mA
Short Circuit Current Each output ±50 mA
Input Capacitance S0, S1, S2 7 pF
Frequency synthesis error Both clocks 0 ppm

Input Crystal Frequency 14.40 MHz
Output Clock Rise Time 0.8 to 2.0V 1.5 ns
Output Clock Fall Time 2.0 to 0.8V 1.5 ns
Output Clock Duty Cycle At VDD/2 40 60 %
Maximum Absolute Jitter, short term 11.288MHz, VDD=5V ±65 ps

11.288MHz, VDD=3.3V ±85 ps

Note: 1. Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the device. Prolonged

MDS 2731-04 CA 3 Revision 122799 Printed 11/16/00

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • [phone]tel • www.icst.com

PRELIMINARY INFORMATION

SOIC

Package Outline and Package Dimensions
(For current dimensional specifications, see JEDEC Publication No. 95.)

MK2731-04C

MPEG Audio Clock

16 pin narrow SOIC

Symbol Min Max

A 1.35 1.75

A1 0.10 0.25

B 0.33 0.51
C 0.19 0.25
D 9.80 10.00

E 3.80 4.00

H 5.80 6.20

e
h 0.25 0.50
L 0.40 1.27

All dimensions in mm.

A1

E H

D

C

e

B

L

A

Ordering Information

Part/Order Number Marking Shipping packaging Package Temperature

MK2731-04S MK2731-04S tubes 16 pin SOIC 0-70 °C

MK2731-04STR MK2731-04S tape and reel 16 pin SOIC 0-70 °C

While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (ICS) assumes no responsibility for either its
use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is
intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary
environmental requirements are not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does
not authorize or warrant any ICS product for use in life support devices or critical medical instruments.

MDS 2731-04 CA 4 Revision 122799 Printed 11/16/00

Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • [phone]tel • www.icst.com