MK2731-03C
MPEG Audio Clock Synthesizer
MDS 2731-03C D
1
Revision 011101
Integrated Circuit Systems, Inc. 525 Race Street, San Jose, CA, 95126 (408) 295-9800 tel www.icst.com
Block Diagram
Description
Features
The MK2731-03 is a low cost, low jitter, high
performance PLL clock synthesizer designed to
replace oscillators and PLL circuits in set-top box
and multimedia systems. Using our proprietary
analog Phase-Locked Loop (PLL) techniques, the
device uses an inexpensive crystal or clock input to
produce up to three output clocks. All of the audio
frequencies are synthesized exactly, with zero ppm
error, and locked to the 27 MHz clock.
MicroClock manufactures the largest variety of
Set-Top Box and multimedia clock synthesizers
for all applications. Consult MicroClock to
eliminate VCXOs, crystals and oscillators from
your board.
Packaged in 16 pin narrow SOIC
Produces exact audio clocks from the video
Uses a crystal or clock input
Zero ppm synthesis error in all clocks
All frequencies are frequency locked
25mA output drive capability at TTL levels
Advanced, low power, sub-micron CMOS process
3.3V or 5V operating voltage
Crystal
Oscillator
PLL/Clock
Synthesis
Circuitry
27 MHz crystal
or clock
Output
Buffer
CLK2
S2:0
3
Output
Buffer
CLK1
Output
Buffer
REF
X2
X1
(Capacitors are required
for crystal tuning)
MK2731-03C
MPEG Audio Clock Synthesizer
MDS 2731-03C D
2
Revision 011101
Integrated Circuit Systems, Inc. 525 Race Street, San Jose, CA, 95126 (408) 295-9800 tel www.icst.com
Pin Descriptions
Key: I = Input, O = output, P = power supply connection
Pin Assignment
Number
Name
Type
Description
1
X2
XO
Crystal connection to a 27 MHz fundamental crystal. Leave unconnected for clock input.
2
X1
XI
Crystal connection to a 27 MHz fundamental crystal. Can also be connected to input clock.
3
VDD
P
VDD. Connect to VDD.
4
VDD
P
VDD. Connect to VDD.
5
GND
P
Connect to ground.
6
GND
P
Connect to ground.
7
S2
I
Clock Select 2. Selects outputs per table above.
8
GND
P
Connect to ground.
9
DC
-
Do not connect anything to this pin.
10
CLK1
O
Clock output 1 determined by status of S2, S1, S0. See table above.
11
S1
I
Clock Select 1. Selects outputs per table above.
12
NC
-
No Connect. Nothing is connected internally to this pin.
13
S0
I
Clock Select 0. Selects outputs per table above.
14
CLK2
O
Clock output 2 determined by status of S2, S1, S0. See table above.
15
NC
-
No Connect. Nothing is connected internally to this pin.
16
REF
O
Reference crystal output or off. See table above.
Output Clock Select Table (MHz)
16
15
14
13
16 pin narrow (150 mil) SOIC
12
11
10
9
1
2
3
4
5
6
7
8
MK2731-03C
VDD
GND
X2
X1
VDD
GND
GND
S2
CLK1
DC
S1
NC
REF
CLK2
Input
S2
S1
S0
CLK1
CLK2
REF
27
0
0
0
Off
8.192
Off
27
0
0
1
Off
11.2896
Off
27
0
1
0
Off
12.288
Off
27
0
1
1
Off
24.576
Off
27
1
0
0
4.096
8.192
27
27
1
0
1
5.6448
11.2896
27
27
1
1
0
6.144
12.288
27
27
1
1
1
12.288
24.576
27
S0
NC
Key:
0 = connect pin directly to ground
1 = connect pin directly to VDD
Off = clock stopped low
MK2731-03C
MPEG Audio Clock Synthesizer
MDS 2731-03C D
3
Revision 011101
Integrated Circuit Systems, Inc. 525 Race Street, San Jose, CA, 95126 (408) 295-9800 tel www.icst.com
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 = 5.0V unless noted)
DC CHARACTERISTICS (VDD = 5.0V unless noted)
Operating Voltage, VDD
3.13
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=-25mA
2.4
V
Output Low Voltage, VOL
IOL=25mA
0.4
V
Output High Voltage, VOH, CMOS level
IOH=-8mA
VDD-0.4
V
Operating Supply Current, IDD
No Load
25
mA
Short Circuit Current
Each output
100
mA
Input Capacitance
S2, S1, S0
7
pF
Frequency synthesis error
All clocks
0
ppm
AC CHARACTERISTICS (VDD = 5.0V unless noted)
AC CHARACTERISTICS (VDD = 5.0V unless noted)
Input Crystal or Clock Frequency
27.00
MHz
Input Crystal Accuracy
30
ppm
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 1.4V
40
60
%
Maximum Absolute Jitter, short term
see table on following page
see table on following page
see table on following page
Electrical Specifications
Notes:
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.
External Components
The MK2731-03 requires a minimum number of external components for proper operation. Decoupling
capacitors of 0.1F should be connected between VDD and GND on pins 3 and 5, as close to the
MK2731-03 as possible. A series termination resistor of 33
may be used for each clock output. The input
crystal must be connected as close to the chip as possible. The input crystal should be a parallel resonant,
fundamental, AT cut 27 MHz. For accurate tuning of the output when a crystal input is used, capacitors
should be connected between X1 and ground, and X2 and ground. The value of these capacitors is given by
the following equation, where C
L
is the crystal load capacitance: Crystal caps (pF) = (C
L
-10) x 2. So for a
crystal with 16 pF load capacitance, two 12 pF caps can be used.
MK2731-03C
MPEG Audio Clock Synthesizer
MDS 2731-03C D
4
Revision 011101
Integrated Circuit Systems, Inc. 525 Race Street, San Jose, CA, 95126 (408) 295-9800 tel www.icst.com
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated 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.
Package Outline and Package Dimensions
Ordering Information
Part/Order Number
Marking
Shipping packaging
Package
Temperature
MK2731-03S
MK2731-03S
tubes
16 pin SOIC
0-70 C
MK2731-03STR
MK2731-03S
tape and reel
16 pin SOIC
0-70 C
B
D
E
H
e
A1
C
A
L
INDEX
AREA
1
2
16 pin SOIC narrow
Inches
Inches
Millimeters
Millimeters
Symbol
Min
Max
Min
Max
A
0.0532
0.0688
1.35
1.75
A1
0.0040
0.0098
0.10
0.24
B
0.0130
0.0200
0.33
0.51
C
0.0075
0.0098
0.19
0.24
D
0.3859
0.3937
9.80
10.00
E
0.1497
0.1574
3.80
4.00
e
.050 BSC
.050 BSC
1.27 BSC
1.27 BSC
H
0.2284
0.2440
5.80
6.20
L
0.0160
0.0500
0.41
1.27
Jitter Measurements
S2
S1
S0
CLK2
5V
3.3V
(MHz)
one sigma (ps)
typical max ( ps)
one sigma (ps)
typical max ( ps)
0
0
0
8.192
45
110
92
185
0
0
1
11.2896
25
60
42
110
0
1
0
12.288
24
70
49
130
0
1
1
24.576
32
90
52
150
Notes:
1. Jitter is about equal at 25C and 70C
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