DATASHEET MK2745-21 DVD/MPEG CLOCK SOURCE Description Features The MK2745-21 is a low-cost, low-jitter, high-performance clock synthesizer for DVD and other MPEG 2-based applications. Using analog Phase-Locked Loop (PLL) techniques, the device accepts a 27 MHz fundamental mode crystal or clock input to produce multiple audio output clocks, a processor clock, the processor clock divided by two, 27 MHz, 24.576 MHz, and a selectable audio clock. The audio clocks are frequency-locked to the 27 MHz using our patented zero ppm error techniques. This allows audio and video to track exactly, thereby eliminating the need for large buffer memory. • • • • Packaged in a 16-pin narrow (150 mil) SOIC Ideal for LuxSonor’s DVD solutions 3.3 V upgrade to the MK2744 Patented zero ppm audio clock error for 256x and 384x sampling rates • Selectable audio sampling frequencies support 32, 44.1, and 48 kHz in most DACs • • • • • • • • IDT manufactures a large variety of DVD, Set-top Box, and multimedia clock synthesizers for all applications. Consult IDT to eliminate crystals and oscillators from your board. 27 MHz fundamental crystal or clock input Eight selectable processor frequencies Fixed clocks of 27 and 24.576 MHz Zero ppm in all clocks 25 mA output drive capability at TTL levels Advanced, low-power, sub-micron CMOS process Operating voltage of 3.0 V to 5.5 V See also the MK2712 for NTSC/PAL clocks Block Diagram VDD 2 AS2:0 PS1:0 Audio Clock 3 2 Clock Synthesis and Control Circuitry 27 MHz crystal or clock X1 24.576 MHz Processor Clock /2 Clock Buffer/ Crystal Ocsillator PCLK/2 27 MHz X2 2 GND IDT™ DVD/MPEG CLOCK SOURCE 1 MK2745-21 REV F 051310 MK2745-21 DVD/MPEG CLOCK SOURCE VCXO AND SYNTHESIZER Pin Assignment Audio Clock (MHz) DecodingTable PS1 1 16 PS0 X2 2 15 24.576M X1/ICLK 3 14 PCLK/2 VDD 4 13 VDD GND 5 12 AS1 ACLK 6 11 GND PCLK 7 10 27M AS2 8 9 AS0 AS2 AS1 AS0 0 0 0 0 1 1 1 1 16-pin (150 mil) SOIC 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 ACLK 12.288 11.2896 8.192 24.576 8.192 16.9344 18.432 11.2896 Processor Clock (MHz) PS1 PS0 0 0 1 1 0 1 0 1 PCLK PCLK/2 66.66 80 50 60 33.33 40 25 30 0 = connect directly to ground 1 = connect directly to VDD Pin Descriptions Pin Number Pin Name Pin Type 1 PS1 Input 2 X2 XO 3 X1/ICLK XI 4 VDD Power Connect to +3.3 V or +5 V. Must be same as other VDD. 5 GND Power Connect to ground. 6 ACLK Output Audio Clock output. Determined by status of AS2, AS1, AS0. See table above. 7 PCLK Output Processor Clock output. Determined by status of PS1, PS0. See table above. 8 AS2 Input Audio clock Select 2. Selects audio clock on pin 6 per table above. 9 AS0 Input Audio clock Select 0. Selects audio clock on pin 6 per table above. 10 27M Output 27 MHz clock output. 11 GND Power Connect to ground. 12 AS1 Input Audio clock Select 1. Selects audio clock on pin 6 per table above. 13 VDD Power Connect to +3.3 V or +5 V. Must be same as other VDD. IDT™ DVD/MPEG CLOCK SOURCE Pin Description Processor clock Select 1. Selects processor clock outputs per table above. Crystal connection. Connect to 27 MHz crystal. Leave unconnected for clock input. Crystal connection. Connect to 27 MHz crystal or to a 27 MHz input clock. 2 MK2745-21 REV F 051310 MK2745-21 DVD/MPEG CLOCK SOURCE VCXO AND SYNTHESIZER Pin Number Pin Name Pin Type Pin Description 14 PCLK/2 Output Processor Clock divided by two output. Determined by status of PS1, PS0. See table above. 15 24.576M Output 24.576 MHz clock output. 16 PS0 Input Processor clock Select 0. Selects processor clock outputs per table above. External Components The MK2745-21 requires a minimum number of external components for proper operation. Decoupling capacitors of 0.1µF should be connected between VDD and GND, as close to the MK2745-21 as possible. A series termination resistor of 33Ω may be used for each clock output. If a clock input is not used, the 27 MHz crystal must be connected as close to the chip as possible. The crystal should be a fundamental mode (do not use third overtone), parallel resonant, 50 ppm or better. Crystal capacitors should be connected from pins X1 to ground and X2 to ground. The value of these capacitors is given by the following equation, where CL is the crystal load capacitance: Crystal caps (pF) = (CL-6) x 2. So, for a crystal with 16 pF load capacitance, two 20 pF caps should be used. Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the MK2745-21. These ratings, which are standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range. Item Rating Supply Voltage, VDD 7V All Inputs and Outputs -0.5 V to VDD+0.5 V Ambient Operating Temperature 0 to +70° C Storage Temperature -65 to +150° C Junction Temperature 125° C Soldering Temperature 260° C IDT™ DVD/MPEG CLOCK SOURCE 3 MK2745-21 REV F 051310 MK2745-21 DVD/MPEG CLOCK SOURCE VCXO AND SYNTHESIZER Recommended Operation Conditions Parameter Min. Max. Units 0 +70 °C +3.0 +5.5 V Ambient Operating Temperature Power Supply Voltage (measured in respect to GND) Typ. DC Electrical Characteristics VDD = 5.0 V (unless noted), Temp 0 to +70° C Parameter Symbol Conditions Operating Voltage VDD Input High Voltage VIH X1/ICLK pin only Input Low Voltage VIL X1/ICLK pin only Input High Voltage VIH Input Low Voltage VIL Output High Voltage VOH IOH = -25 mA Output Low Voltage VOL IOL = 25 mA Output High Voltage VOH IOH = -8 mA Operating Supply Current IDD No Load, Note 1 Short Circuit Current IOS Each output Input Capacitance CIN Min. Typ. 3.0 Max. Units 5.5 V (VDD/2)+1 V (VDD/2)-1 V 2 V 0.8 V 2.4 V 0.4 V VDD-0.4 V 37 mA ±100 mA 7 pF Note 1: With processor clock at 50 MHz and ACLK at 16.93 MHz. AC Electrical Characteristics VDD = 5.0 V (unless noted), Temp 0 to +70° C Parameter Symbol Conditions Min. Input Frequency Typ. Max. Units 27 MHz Output Clock Rise Time tOR 0.8 to 2.0 V 1.5 ns Output Clock Fall Time tOF 2.0 to 0.8 V 1.5 ns 60 % 1 ppm Output Clock Duty Cycle at VDD/2 40 Frequency Error 0 Absolute Jitter, short term Variation from mean 200 ps Thermal Characteristics Parameter Thermal Resistance Junction to Ambient Thermal Resistance Junction to Case IDT™ DVD/MPEG CLOCK SOURCE Symbol Conditions Min. Typ. Max. Units θJA Still air 120 ° C/W θJA 1 m/s air flow 115 ° C/W θJA 3 m/s air flow 105 ° C/W 58 ° C/W θJC 4 MK2745-21 REV F 051310 MK2745-21 DVD/MPEG CLOCK SOURCE VCXO AND SYNTHESIZER Package Outline and Package Dimensions (16-pin SOIC, 150 Mil. Narrow Body) Package dimensions are kept current with JEDEC Publication No. 95 Millimeters 16 Symbol E Min A A1 B C D E e H h L α H INDEX AREA 1 2 D A Inches Max Min 1.35 1.75 0.10 0.25 0.33 0.51 0.19 0.25 9.80 10.00 3.80 4.00 1.27 BASIC 5.80 6.20 0.25 0.50 0.40 1.27 0° 8° Max .0532 .0688 .0040 .0098 .013 .020 .0075 .0098 .3859 .3937 .1497 .1574 0.050 BASIC .2284 .2440 .010 .020 .016 .050 0° 8° h x 45 A1 C -Ce B SEATING PLANE L .10 (.004) C Ordering Information Part / Order Number Marking Shipping Packaging Package Temperature MK2745-21SLF 2745-21SLF Tubes 16-pin SOIC 0 to 70° C MK2745-21SLFTR 2745-21SLF Tape and Reel 16-pin SOIC 0 to 70° C “LF” denotes Pb (lead) free package While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (IDT) 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 IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT does not authorize or warrant any IDT product for use in life support devices or critical medical instruments. IDT™ DVD/MPEG CLOCK SOURCE 5 MK2745-21 REV F 051310 MK2745-21 DVD/MPEG CLOCK SOURCE VCXO AND SYNTHESIZER Innovate with IDT and accelerate your future networks. Contact: www.IDT.com For Sales For Tech Support 800-345-7015 408-284-8200 Fax: 408-284-2775 www.idt.com/go/clockhelp Corporate Headquarters Integrated Device Technology, Inc. www.idt.com © 2006 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT and the IDT logo are trademarks of Integrated Device Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners. Printed in USA