MK2731-04C
MPEG Audio Clock
MDS 2731-04 CA
1
Revision 122799
Printed 11/16/00
Integrated Circuit Systems, Inc. 525 Race Street San Jose CA 95126 (408)295-9800tel www.icst.com
PRELIMINARY INFORMATION
Block Diagram
Description
Features
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.
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 -
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
Crystal
Oscillator
PLL/Clock
Synthesis
Circuitry
CLK2
14.40 MHz
crystal
X1
X2
Output
Buffer
CLK1
Output
Buffer
S2:S0
3
2
3
3
VDD
GND
MK2731-04C
MPEG Audio Clock
MDS 2731-04 CA
2
Revision 122799
Printed 11/16/00
Integrated Circuit Systems, Inc. 525 Race Street San Jose CA 95126 (408)295-9800tel www.icst.com
PRELIMINARY INFORMATION
Pin Descriptions
Key: I = Input with internal pull-up resistor; O = output; P = power supply connection; XI, XO = crystal
connections
Pin Assignment
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:
0 = connect directly to GND
1 = connect directly to VDD
16
15
14
13
16 pin narrow (150 mil) SOIC
12
11
10
9
1
2
3
4
5
6
7
8
MK2731-04
VDD
GND
X2
X1
VDD
S2
GND
GND
S1
DC
CLK1
CLK2
DC
DC
S0
VDD
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
Output Clocks Select Table (MHz)
External Components
The MK2731-04 requires a minimum number of external components for proper operation. Decoupling
capacitors of 0.01F 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
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 (C
L
-6)*2, where C
L
is the crystal load (or correlation) capacitance.
MK2731-04C
MPEG Audio Clock
MDS 2731-04 CA
3
Revision 122799
Printed 11/16/00
Integrated Circuit Systems, Inc. 525 Race Street San Jose CA 95126 (408)295-9800tel www.icst.com
PRELIMINARY INFORMATION
Parameter
Conditions
Minimum
Typical
Maximum
Units
ABSOLUTE MAXIMUM RATINGS (note 1)
ABSOLUTE MAXIMUM RATINGS (note 1)
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
DC CHARACTERISTICS (VDD = 3.3V unless noted)
DC CHARACTERISTICS (VDD = 3.3V unless noted)
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
AC CHARACTERISTICS (VDD = 3.3V unless noted)
AC CHARACTERISTICS (VDD = 3.3V unless noted)
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
Electrical Specifications
Note:
1. Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the device. Prolonged
exposure to levels above the operating limits but below the Absolute Maximums may affect device reliability.
MK2731-04C
MPEG Audio Clock
MDS 2731-04 CA
4
Revision 122799
Printed 11/16/00
Integrated Circuit Systems, Inc. 525 Race Street San Jose CA 95126 (408)295-9800tel www.icst.com
PRELIMINARY INFORMATION
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.
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
B
D
E
H
e
C
A
L
A1
Package Outline and Package Dimensions
(
For current dimensional specifications, see JEDEC Publication No. 95.)
16 pin narrow SOIC
SOIC
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 1.27 BSC
1.27 BSC
h
0.25
0.50
L
0.40
1.27
All dimensions in mm.
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