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| MK1412 MPEG Audio Clock Synthesizer Description The MK1412 is the ideal way to generate clocks for MPEG audio devices in computers. The device uses ICS/MicroClock's proprietary mixture of analog and digital Phase-Locked Loop (PLL) technology to synthesize one of eight frequencies (four on each output) from the 14.31818 MHz reference. In an 8 pin SOIC, the MK1412 can save component count, board space, and cost over crystals and oscillators, and increase reliability by eliminating three expensive mechanical devices from the board. We offer many other clocks for computers and computer peripherals. Consult us when you need to remove crystals and oscillators from your board. Due to a long lead time in the original wafer fab that makes the MK1412S, we have retooled the die and now call the part the MK1412A. All functional parameters are the same as or better than the original part. Features * Packaged in 8 pin SOIC * Input crystal or clock frequency of 14.31818 MHz * Provides master MPEG clocks for 32 kHz, 44.1 kHz, 48 kHz and 96 kHz sampling rates * Output clock frequencies of 256x and 512x of the audio sampling rates compatible with most DACs * Low jitter * Full CMOS output swing with 25mA drive capability at TTL levels * 3.3V or 5V10% supply voltage * Advanced, low power CMOS process * The A version is the newest version in a more advanced manufacturing process Block Diagram VDD GND 2 S1, S0 Output Buffer PLL Clock Synthesis and Control Circuitry /2 Output Buffer CLK 14.31818 MHz crystal or clock X1 Crystal Oscillator X2 CLK/2 1 Revision 060200 Printed 11/15/00 Integrated Circuit Systems, Inc.* 525 Race Street* San Jose * CA * 95126* (408)295-9800tel *www.icst.com MDS 1412 B MK1412 MPEG Audio Clock Synthesizer Pin Assignment X1 VDD GND CLK/2 1 2 3 4 8 7 6 5 X2 CLK S1 S0 Audio Clock Outputs Select Table (MHz) S1 0 0 1 1 S0 0 1 0 1 CLK 16.384 22.5792 24.576 49.152 CLK/2 8.192 11.2896 12.288 24.576 Accuracy 1 ppm 25 ppm 1 ppm 1 ppm 8 pin SOIC Pin Descriptions Number 1 2 3 4 5 6 7 8 Name X1 VDD GND CLK/2 S0 S1 CLK X2 Type I P P O I I O O Description Crystal Connection. Connect to a 14.31818 MHz crystal or clock. Connect to +3.3V or +5V. Connect to ground. Audio Clock divide by 2 output as per table above. Frequency Select 0 Input. Determines CLK and CLK/2 outputs as per table above. Frequency Select 0 Input. Determines CLK and CLK/2 outputs as per table above. Audio Clock output as per table above. Crystal Connection to a 14.31818 MHz crystal, or leave unconnected for clock input. Key: I = Input, O = output, P = power supply connection External Components/Crystal Selection A minimum number of external components are required for proper oscillation. For a crystal input, one load capacitor can be connected to each of the X1 and X2 pins and ground, and a parallel resonant 14.31818 MHz crystal is recommended. The value (in pF) of each crystal load capacitor should equal (C L -18)*2, where CL is the crystal's load (correlation) capacitance in pF. So for crystals with 18 pF load capacitance (or less), no extra capacitors are needed. The frequency tolerance of the crystal should be 50ppm or better. For a clock input, connect to X1 and leave X2 unconnected. A decoupling capacitor of 0.1F should be connected between VDD and GND on pins 2 and 3, and 33 terminating resistor may be used on the clock outputs if the trace is longer than 1 inch. 2 Revision 060200 Printed 11/15/00 Integrated Circuit Systems, Inc.* 525 Race Street* San Jose * CA * 95126* (408)295-9800tel *www.icst.com MDS 1412 B MK1412 MPEG Audio Clock Synthesizer Electrical Specifications Parameter Supply Voltage, VDD Inputs Clock Outputs Ambient Operating Temperature Soldering Temperature Storage temperature Operating Voltage, VDD Input High Voltage, VIH, input clock only Input Low Voltage, VIL, input clock only Output High Voltage, VOH Output High Voltage, VOH Output Low Voltage, VOL Operating Supply Current, IDD, 5V Operating Supply Current, IDD, 3.3V Input Capacitance Input Clock or Crystal Frequency Input Crystal Accuracy Accuracy (synthesis error) Input Clock Duty Cycle Output Clock Rise Time Output Clock Fall Time Output Clock Duty Cycle Absolute Clock Period Jitter One Sigma Clock Period Jitter Conditions Referenced to GND Referenced to GND Referenced to GND Max of 10 seconds -65 3 (VDD/2)+1 VDD-0.4 2.4 0.4 12 7 7 14.31818 50 With exact crystal Time above VDD/2 0.8 to 2.0V 2.0 to 0.8V Time above VDD/2 See page 2 20 80 1.5 1.5 60 Minimum Typical Maximum 7 VDD+.5V VDD+.5V 70 260 150 5.5 VDD/2 VDD/2 (VDD/2)-1 Units V V V C C C V V V V V V mA mA pF MHz ppm ppm % ns ns % ps ps ABSOLUTE MAXIMUM RATINGS (note 1) -0.5 -0.5 0 DC CHARACTERISTICS (at 5.0V unless otherwise noted) Clock input Clock input IOH=-4mA IOH=-25mA IOL=25mA No Load No Load S0, S1 pins AC CHARACTERISTICS (at 5.0V unless otherwise noted) 40 50 200 70 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. Typical values are at 25C. 3 Revision 060200 Printed 11/15/00 Integrated Circuit Systems, Inc.* 525 Race Street* San Jose * CA * 95126* (408)295-9800tel *www.icst.com MDS 1412 B MK1412 MPEG Audio Clock Synthesizer Package Outline and Package Dimensions (For current dimensional specifications, see JEDEC Publication No. 95.) 8 pin SOIC Symbol A A1 E INDEX AREA H B C 1 2 h x 45 D D E e H h L Inches Min Max 0.0532 0.0688 0.0040 0.0098 0.0130 0.0200 0.0075 0.0098 0.1890 0.1968 0.1497 0.1574 .050 BSC 0.2284 0.2440 0.0099 0.0195 0.0160 0.0500 Millimeters Min Max 1.35 1.75 0.10 0.24 0.33 0.51 0.19 0.24 4.80 5.00 3.80 4.00 1.27 BSC 5.80 6.20 0.25 0.50 0.41 1.27 A1 e B C A L Ordering Information Part/Order Number MK1412A MK1412ATR MK1412S MK1412STR Marking MK1412A MK1412A MK1412S MK1412S Package 8 pin SOIC Add tape and reel 8 pin SOIC Add tape and reel Temperature 0-70C 0-70C 0-70C 0-70C While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (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. 4 Revision 060200 Printed 11/15/00 Integrated Circuit Systems, Inc.* 525 Race Street* San Jose * CA * 95126* (408)295-9800tel *www.icst.com MDS 1412 B |
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