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MK2722 Sigma Designs Clock Source
Description
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 A. 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.
Features
* 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 * Low jitter * Total of four output clocks * 25 mA output drive capability at TTL levels * 5V10% supply voltage (contact ICS for 3.3V operation) * Advanced, low power, sub-micron CMOS process
Block Diagram
VDD 3
GND 2
PD AS1:0 2 Clock Synthesis and Control Circuitry
Output Buffer Output Buffer Output Buffer
ACLK
2 BS1:0
BCLK
BCLK/2
27 MHz crystal or clock X1 Crystal Oscillator X2
Output Buffer
27.0000 MHz
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 pin 12 0 0 0 1 1 1 AS0 pin 8 0 M 1 0 M 1 ACLK pin 7 12.288 18.432 16.9344 11.2896 12.288 8.192
VDD X2 X1 VDD GND BS1 ACLK AS0
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
BS0 PD 27M VDD AS1 GND BCLK/2 BCLK
BCLK Decoding Table (MHz) BS1 pin 6 0 0 1 1 BS0 pin 16 0 1 0 1 BCLK pin 9 40.5 50 28.6364 40 BCLK/2 pin 10 20.25 25 14.3182 20
16 pin narrow (150 mil) SOIC
Pin Descriptions
Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Name VDD X2 X1 VDD GND BS1 ACLK AS0 BCLK BCLK/2 GND AS1 VDD 27M PD BS0 Type I XO XI P P I O TI O O P I P O I I Description 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. Connect to ground. 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. Select 1 for ACLK. Determines ACLK output per table above. Internal pull-up. Connect to +5V. 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.
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 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply voltage, VDD Referenced to GND Inputs and Clock Outputs Referenced to GND -0.5 Ambient Operating Temperature 0 Soldering Temperature Max of 10 seconds Storage temperature -65 DC CHARACTERISTICS (VDD = 5V unless noted) Operating Voltage, VDD 4.5 Input High Voltage, VIH 2 Input Low Voltage, VIL Output High Voltage, VOH IOH=-4mA VDD-0.4 Output Low Voltage, VOL IOL=25mA Operating Supply Current, IDD, 5.0V No Load Power Down Supply Current, IDDPD, 5V No Load, note 2 Short Circuit Current Each output Input Capacitance On chip pull-up resistor Pins 6, 8, 12, 15, and 16 AC CHARACTERISTICS (VDD = 5V unless noted) Input Frequency Input Crystal Accuracy Frequency Error, all clocks Output Clock Rise Time 0.8 to 2.0V Output Clock Fall Time 2.0 to 0.8V Output Clock Duty Cycle At 1.4V 40 Maximum Absolute Jitter, short term Typical
Maximum
Units V V C C C V V V V V mA A mA pF k MHz ppm ppm ns ns % ps
7 VDD+0.5 70 260 150 5 5.5 0.8 0.4 30 25 50 7 250 27.000 30 0 1.5 1.5 60
50 200
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 0.1F 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 33 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 = (CL 12)*2, where C L is the crystal load capacitance in pF. So for a crystal with 16pF load capacitance, the crystal 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 A 0.055 0.070 b 0.013 0.019 c 0.007 0.010 D 0.385 0.400 E 0.150 0.160 H 0.225 0.245 e .050 BSC h 0.016 Q 0.004 0.01 Millimeters Min Max 1.397 1.778 0.330 0.483 0.191 0.254 9.779 10.160 3.810 4.064 5.715 6.223 1.27 BSC 0.406 0.102 0.254
E
H
h x 45 D
Q e b
c
A
Ordering Information
Part/Order Number MK2722-01S MK2722-01STR Marking MK2722-01S MK2722-01S Shipping packaging tubes tape and reel Package 16 pin SOIC 16 pin SOIC Temperature 0-70C 0-70C
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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