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| MK2731-03C MPEG Audio Clock Synthesizer 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. 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. Features * 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 Block Diagram S2:0 3 PLL/Clock Synthesis Circuitry 27 MHz crystal or clock X1 Crystal Oscillator X2 Output Buffer Output Buffer CLK1 CLK2 Output Buffer REF (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 X2 X1 VDD VDD GND GND S2 GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 REF NC CLK2 S0 NC S1 CLK1 DC Output Clock Select Table (MHz) Input 27 27 27 27 27 27 27 27 S2 0 0 0 0 1 1 1 1 S1 0 0 1 1 0 0 1 1 S0 0 1 0 1 0 1 0 1 CLK1 Off Off Off Off 4.096 5.6448 6.144 12.288 CLK2 8.192 11.2896 12.288 24.576 8.192 11.2896 12.288 24.576 REF Off Off Off Off 27 27 27 27 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 X2 X1 VDD VDD GND GND S2 GND DC CLK1 S1 NC S0 CLK2 NC REF Type XO XI P P P P I P O I I O O Key: 0 = connect pin directly to ground 1 = connect pin directly to VDD Off = clock stopped low Description 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. VDD. Connect to VDD. Connect to ground. Connect to ground. Clock Select 2. Selects outputs per table above. Connect to ground. Do not connect anything to this pin. 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. 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 Supply voltage, VDD Inputs and Clock Outputs Ambient Operating Temperature Soldering Temperature Storage temperature Operating Voltage, VDD Input High Voltage, VIH, X1 pin only Input Low Voltage, VIL, X1 pin only Input High Voltage, VIH Input Low Voltage, VIL Output High Voltage, VOH Output Low Voltage, VOL Output High Voltage, VOH, CMOS level Operating Supply Current, IDD Short Circuit Current Input Capacitance Frequency synthesis error Input Crystal or Clock Frequency Input Crystal Accuracy Output Clock Rise Time Output Clock Fall Time Output Clock Duty Cycle Maximum Absolute Jitter, short term Notes: Conditions Referenced to GND Referenced to GND Max of 10 seconds -65 3.13 (VDD/2)+1 2 0.8 IOH=-25mA IOL=25mA IOH=-8mA No Load Each output S2, S1, S0 All clocks 2.4 0.4 VDD-0.4 25 100 7 0 27.00 Minimum Typical Maximum 7 VDD+0.5 70 260 150 5.50 Units V V C C C V V V V V V V V mA mA pF ppm MHz ppm ns ns % ABSOLUTE MAXIMUM RATINGS (note 1) -0.5 0 DC CHARACTERISTICS (VDD = 5.0V unless noted) VDD/2 VDD/2 (VDD/2)-1 AC CHARACTERISTICS (VDD = 5.0V unless noted) 30 1.5 1.5 40 60 see table on following page 0.8 to 2.0V 2.0 to 0.8V At 1.4V 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 CL is the crystal load capacitance: Crystal caps (pF) = (CL -10) x 2. So for a 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 0 0 0 0 Notes: S1 0 0 1 1 S0 0 1 0 1 CLK2 (MHz) 8.192 11.2896 12.288 24.576 5V one sigma (ps) typical max ( ps) 45 110 25 60 24 70 32 90 3.3V one sigma (ps) typical max ( ps) 92 185 42 110 49 130 52 150 1. Jitter is about equal at 25C and 70C Package Outline and Package Dimensions 16 pin SOIC narrow Symbol A A1 B C D E e H L Inches Min Max 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 0.2284 0.2440 0.0160 0.0500 Millimeters Min Max 1.35 1.75 0.10 0.24 0.33 0.51 0.19 0.24 9.80 10.00 3.80 4.00 1.27 BSC 5.80 6.20 0.41 1.27 E INDEX AREA H 1 2 D A1 e Ordering Information Part/Order Number MK2731-03S MK2731-03STR Marking MK2731-03S MK2731-03S Shipping packaging tubes tape and reel Package 16 pin SOIC 16 pin SOIC Temperature 0-70 C 0-70 C B C A L 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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