MK2722 [ICSI]
Sigma Designs Clock Source; Sigma Designs的时钟源
| 型号： | MK2722 |
| 厂家： | 
INTEGRATED CIRCUIT SOLUTION INC |
| 描述： | Sigma Designs Clock Source |
| 文件： | 总4页 (文件大小：60K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MK2722
Sigma Designs Clock Source
Description
Features
The MK2722 is a low cost, low jitter, high performance
clock synthesizer designed for Sigma Designs’ MPEG
decoder systems. Using analog Phase-Locked Loop
(PLL) techniques, the device accepts a 27 MHz crystal
or clock input to produce multiple output clocks. The
power down pin turns off the device, drawing less than
100 µA.
• Packaged in 16 pin narrow (150 mil) SOIC
• Uses 27 MHz crystal or clock input
• Zero ppm synthesis error in all clocks (audio clocks
exactly track 27 MHz video clock)
• Audio clock supports 32, 44.1, and 48kHz
sampling rates at 256X and 384X
• Power down turns off chip
ICS offers a wide variety of clock synthesizers for
desktop and portable computers, and multimedia
systems. Consult ICS to eliminate crystals and
oscillators from your board.
• Low jitter
• Total of four output clocks
• 25 mA output drive capability at TTL levels
• 5V±10% supply voltage (contact ICS for
3.3V operation)
• Advanced, low power, sub-micron CMOS process
Block Diagram
VDD
GND
3
2
PD
Output
Buffer
ACLK
2
2
Clock
Synthesis and
Control Circuitry
AS1:0
Output
Buffer
BCLK
BS1:0
Output
Buffer
BCLK/2
27 MHz crystal
or clock
X1
Crystal
Oscillator
Output
Buffer
27.0000 MHz
X2
MDS 2722 B
1
Revision 020802
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408)295 9800tel • www.icst.com
MK2722
Sigma Designs Clock Source
Pin Assignment
ACLK Decoding Table (MHz)
AS1
AS0
ACLK
pin 7
pin 12 pin 8
1
2
3
4
5
6
7
16
15
14
13
12
11
10
9
VDD
X2
BS0
PD
0
0
0
1
1
1
0
M
1
12.288
18.432
16.9344
11.2896
12.288
8.192
0
X1
27M
VDD
AS1
M
1
VDD
GND
BS1
ACLK
AS0
BCLK Decoding Table (MHz)
GND
BS1
BS0
BCLK
pin 9
40.5
50
BCLK/2
pin 10
20.25
25
BCLK/2
BCLK
pin 6 pin 16
0
0
1
1
0
1
0
1
8
16 pin narrow (150 mil) SOIC
28.6364
40
14.3182
20
Pin Descriptions
Number
Name
VDD
X2
Type Description
1
2
I
XO
XI
P
P
I
Connect to +5V.
Crystal connection. Connect to 27 MHz crystal. Leave unconnected for clock input.
Crystal connection. Connect to 27 MHz crystal or clock.
Connect to +5V.
3
X1
4
VDD
GND
BS1
5
Connect to ground.
6
Select 1 for BCLK. Determines BCLK outputs per table above. Internal pull-up.
Audio Clock output. Determined by status of AS1, AS0 per table above.
Select 0 for ACLK. Determines ACLK output per table above.
BCLK output. Determined by status of BS1, BS0 per table above.
BCLK divided by two output. Determined by status of BS1, BS0 per table above.
Connect to ground.
7
ACLK
AS0
O
TI
O
O
P
I
8
9
BCLK
BCLK/2
GND
AS1
10
11
12
13
14
15
16
Select 1 for ACLK. Determines ACLK output per table above. Internal pull-up.
Connect to +5V.
VDD
27M
PD
P
O
I
27.0000 MHz buffered crystal clock output.
Power Down. Active low. Clocks stop low. Internal pull-up.
Select 0 for BCLK. Determines BCLK outputs per table above. Internal pull-up.
BS0
I
Key: I = Input, TI = Tri-level input, O = output, P = power supply connection
MDS 2722 B
2
Revision 020802
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408)295 9800tel • www.icst.com
MK2722
Sigma Designs Clock Source
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
Inputs and Clock Outputs
Ambient Operating Temperature
Soldering Temperature
Storage temperature
Referenced to GND
-0.5
0
V
°C
°C
°C
Max of 10 seconds
260
-65
150
DC CHARACTERISTICS (VDD = 5V unless noted)
Operating Voltage, VDD
4.5
2
5
5.5
0.8
0.4
V
V
Input High Voltage, VIH
Input Low Voltage, VIL
V
Output High Voltage, VOH
Output Low Voltage, VOL
Operating Supply Current, IDD, 5.0V
Power Down Supply Current, IDDPD, 5V
Short Circuit Current
IOH=-4mA
IOL=25mA
No Load
VDD-0.4
V
V
30
25
mA
µA
mA
pF
kW
No Load, note 2
Each output
±50
7
Input Capacitance
On chip pull-up resistor
Pins 6, 8, 12, 15, and 16
250
AC CHARACTERISTICS (VDD = 5V unless noted)
Input Frequency
27.000
MHz
ppm
ppm
ns
Input Crystal Accuracy
±30
0
Frequency Error, all clocks
Output Clock Rise Time
0.8 to 2.0V
2.0 to 0.8V
At 1.4V
1.5
1.5
60
Output Clock Fall Time
ns
Output Clock Duty Cycle
Maximum Absolute Jitter, short term
40
50
%
200
ps
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.
2. With AS1=AS0=BS1=BS0=VDD
External Components
The MK2722 requires a minimum number of external components for proper operation. Decoupling capacitors of
0.1µF should be connected between VDD and GND (pins 4 and 5, 13 and 11), as close to the MK2722 as possible.
A series termination resistor of 33W may be used for each clock output. If a clock input is not used, a 27 MHz
fundamental mode crystal must be connected as close to the chip as possible. Crystal capacitors should be
connected from pins X1 to ground and X2 to ground. The value (in pF) of these crystal capacitors should be = (C -
L
12)*2, where C is the crystal load capacitance in pF. So for a crystal with 16pF load capacitance, the crystal
L
capacitors should be 8pF each.
MDS 2722 B
3
Revision 020802
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408)295 9800tel • www.icst.com
MK2722
Sigma Designs Clock Source
Package Outline and Package Dimensions
16 pin SOIC narrow
Inches
Symbol Min Max
Millimeters
Min Max
A
b
0.055 0.070 1.397 1.778
0.013 0.019 0.330 0.483
0.007 0.010 0.191 0.254
0.385 0.400 9.779 10.160
0.150 0.160 3.810 4.064
0.225 0.245 5.715 6.223
c
E
H
D
E
H
e
.050 BSC
0.016
0.004 0.01 0.102 0.254
1.27 BSC
h
0.406
Q
h x 45°
D
A
c
Q
b
e
Ordering Information
Part/Order Number
MK2722-01S
Marking
Shipping packaging
tubes
Package
Temperature
0-70°C
MK2722-01S
MK2722-01S
16 pin SOIC
16 pin SOIC
MK2722-01STR
tape and reel
0-70°C
While the information presented herein has been checked for both accuracy and reliability, 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 2722 B
4
Revision 020802
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose • CA • 95126 • (408)295 9800tel • www.icst.com
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