MK2731-03C [ICSI]
MPEG Audio Clock Synthesizer; MPEG音频时钟合成器
| 型号： | MK2731-03C |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | MPEG Audio Clock Synthesizer |
| 文件： | 总4页 (文件大小：65K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MK2731-03C
MPEG Audio Clock Synthesizer
Features
Description
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.
• 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
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.
Block Diagram
3
S2:0
Output
CLK1
Buffer
PLL/Clock
Synthesis
Circuitry
Output
Buffer
CLK2
REF
27 MHz crystal
or clock
X1
Crystal
Oscillator
Output
Buffer
X2
(Capacitors are required
for crystal tuning)
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
MK2731-03C
MPEG Audio Clock Synthesizer
Pin Assignment
MK2731-03C
Output Clock Select Table (MHz)
16
15
14
13
1
2
3
4
5
6
7
8
REF
NC
X2
X1
Input
27
S2
0
S1
0
S0
0
CLK1
Off
CLK2
8.192
REF
Off
Off
Off
Off
27
CLK2
S0
27
0
0
1
Off
11.2896
12.288
24.576
8.192
VDD
VDD
GND
GND
S2
27
0
1
0
Off
27
0
1
1
Off
12 NC
27
1
0
0
4.096
S1
11
10
9
27
1
0
1
5.6448 11.2896
6.144 12.288
12.288 24.576
27
CLK1
DC
27
1
1
0
27
GND
27
1
1
1
27
Key: 0 = connect pin directly to ground
1 = connect pin directly to VDD
Off = clock stopped low
16 pin narrow (150 mil) SOIC
Pin Descriptions
Number
Name
X2
Type Description
1
2
XO
XI
P
P
P
P
I
Crystal connection to a 27 MHz fundamental crystal. Leave unconnected for clock input.
Crystal connection to a 27 MHz fundamental crystal. Can also be connected to input clock.
VDD. Connect to VDD.
X1
3
VDD
VDD
GND
GND
S2
4
VDD. Connect to VDD.
5
Connect to ground.
6
Connect to ground.
7
Clock Select 2. Selects outputs per table above.
Connect to ground.
8
GND
DC
P
-
9
Do not connect anything to this pin.
10
11
12
13
14
15
16
CLK1
S1
O
I
Clock output 1 determined by status of S2, S1, S0. See table above.
Clock Select 1. Selects outputs per table above.
No Connect. Nothing is connected internally to this pin.
Clock Select 0. Selects outputs per table above.
Clock output 2 determined by status of S2, S1, S0. See table above.
No Connect. Nothing is connected internally to this pin.
Reference crystal output or off. See table above.
NC
-
S0
I
CLK2
NC
O
-
REF
O
Key: I = Input, O = output, P = power supply connection
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
MK2731-03C
MPEG Audio Clock Synthesizer
Electrical Specifications
Parameter
Conditions
Minimum
Typical
Maximum
Units
ABSOLUTE MAXIMUM RATINGS (note 1)
Supply voltage, VDD
Referenced to GND
7
VDD+0.5
70
V
V
Inputs and Clock Outputs
Ambient Operating Temperature
Soldering Temperature
Storage temperature
Referenced to GND
Max of 10 seconds
-0.5
0
°C
°C
°C
260
-65
150
DC CHARACTERISTICS (VDD = 5.0V unless noted)
Operating Voltage, VDD
3.13
5.50
(VDD/2)-1
0.8
V
V
Input High Voltage, VIH, X1 pin only
Input Low Voltage, VIL, X1 pin only
Input High Voltage, VIH
(VDD/2)+1
VDD/2
VDD/2
V
2
V
Input Low Voltage, VIL
V
Output High Voltage, VOH
Output Low Voltage, VOL
Output High Voltage, VOH, CMOS level
Operating Supply Current, IDD
Short Circuit Current
IOH=-25mA
IOL=25mA
IOH=-8mA
No Load
2.4
V
0.4
V
VDD-0.4
V
25
±100
7
mA
mA
pF
ppm
Each output
S2, S1, S0
Input Capacitance
Frequency synthesis error
All clocks
0
AC CHARACTERISTICS (VDD = 5.0V unless noted)
Input Crystal or Clock Frequency
27.00
MH z
ppm
ns
Input Crystal Accuracy
±30
1.5
1.5
60
Output Clock Rise Time
0.8 to 2.0V
2.0 to 0.8V
At 1.4V
Output Clock Fall Time
ns
Output Clock Duty Cycle
Maximum Absolute Jitter, short term
40
%
see table on following page
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 0.1µF 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 33Wmay 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 is the crystal load capacitance: Crystal caps (pF) = (C -10) x 2. So for a
L
L
crystal with 16 pF load capacitance, two 12 pF caps can be used.
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
MK2731-03C
MPEG Audio Clock Synthesizer
Jitter Measurements
S2
S1
S0
CLK2
(MHz)
8.192
5V
3.3V
one sigma (ps) typical max (± ps) one sigma (ps) typical max (± ps)
0
0
0
0
0
0
1
1
0
1
0
1
45
25
24
32
110
60
92
42
49
52
185
110
130
150
11.2896
12.288
24.576
70
90
Notes: 1. Jitter is about equal at 25°C and 70°C
Package Outline and Package Dimensions
16 pin SOIC narrow
Inches
Millimeters
Symbol
Min
Max
Min
Max
A
A1
B
C
D
E
0.0532 0.0688
0.0040 0.0098
0.0130 0.0200
0.0075 0.0098
0.3859 0.3937
0.1497 0.1574
.050 BSC
1.35
1.75
0.24
0.51
0.24
10.00
4.00
0.10
E
H
0.33
0.19
INDEX
AREA
9.80
3.80
e
1.27 BSC
5.80
1
2
H
L
0.2284 0.2440
0.0160 0.0500
6.20
1.27
0.41
D
A
A1
C
B
e
L
Ordering Information
Part/Order Number
MK2731-03S
Marking
Shipping packaging
tubes
Package
Temperature
0-70 °C
MK2731-03S
MK2731-03S
16 pin SOIC
16 pin SOIC
MK2731-03STR
tape and reel
0-70 °C
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.
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
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