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| PRELIMINARY INFORMATION I C R O C LOC K Description The MK2704 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 patented analog Phase-Locked Loop (PLL) techniques, the device uses a fundamental 27 MHz crystal or clock input to produce a buffered reference clock and a selectable audio clock. The audio clock is frequency locked to the 27 MHz clock, assuring that the audio with zero ppm error and video will always track perfectly. MK2704 PLL Audio Clock Synthesizer Features * Packaged in 8 pin SOIC * Uses an inexpensive fundamental crystal, or clock * Output clocks of 16.9344 MHz, 18.432 MHz, and 36.864 MHz * Supports 384x MPEG sampling rates of 44.1 kHz, 48 kHz and 96 kHz * Patented zero ppm synthesis error in all clocks * All frequencies are frequency locked * Advanced, low power, sub-micron CMOS process * 3.3 V or 5 V operating voltage Block Diagram VDD GND S1:0 2 PLL Clock Synthesis and Control Circuitry Crystal Oscillator Output Buffer CLK 27 MHz crystal or clock X1 Output Buffer 27.000 MHz X2 (Capacitors are required for crystal tuning) MDS 2704 A 1 Revision 062700 Integrated Circuit Systems, Inc. * 525 Race Street * San Jose *CA*95126*(408) 295-9800tel * www.icst.com PRELIMINARY INFORMATION I C R O C LOC K Pin Assignment MK2704 PLL Audio Clock Synthesizer Audio Clock Output Select Table (MHz) S1 0 0 1 1 Key: S0 0 1 0 1 CLK 36.864 Test 16.9344 18.432 MK2704 X1 VDD GND 27M 1 2 3 4 8 7 6 5 X2 S0 S1 CLK 0 = connect pin directly to ground 1 = connect pin directly to VDD 8 pin SOIC Pin Descriptions Number 1 2 3 4 5 6 7 8 Name X1 VDD GND 27M CLK S1 S0 X2 Type XI P P O O I(PU) I(PU) XO Description Crystal Connection. Connect to a 27.0 MHz fundamental crystal or clock. Connect to +3.3V or +5V. Connect to ground. 27.00 MHz buffered reference clock output. Audio Clock Output per table above. Audio Clock Frequency Select Input #1. Determines CLK output per table above. Audio Clock Frequency Select Input #0. Determines CLK output per table above. Crystal Connection to a 27.0 MHz crystal, or leave unconnected for clock input. Key: XI, XO = Crystal connections; I(PU) = Input with internal pull-up resistor; O = output; P = power supply connection MDS 2704 A 2 Revision 062700 Integrated Circuit Systems, Inc. * 525 Race Street * San Jose *CA*95126*(408) 295-9800tel * www.icst.com PRELIMINARY INFORMATION I C R O C LOC K 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 Frequency Input Crystal Accuracy Output Clock Rise Time Output Clock Fall Time Output Clock Duty Cycle Maximum Absolute Jitter, short term Notes: Conditions MK2704 PLL Audio Clock Synthesizer Minimum Typical Maximum 7 VDD+0.5 70 260 150 5.50 (VDD/2)-1 2 0.8 Units V V C C C V V V V V V V V mA mA pF ppm MHz ppm ns ns % ps ABSOLUTE MAXIMUM RATINGS (note 1) Referenced to GND Referenced to GND MK2704S Max of 10 seconds -0.5 0 -65 3.13 (VDD/2)+1 DC CHARACTERISTICS (VDD = 3.3V unless noted) Note 2 Note 2 IOH=-12mA IOL=12mA IOH=-4mA No Load Each output S1, S0 All clocks 2.4 0.4 VDD-0.4 10 50 5 0 27.00 AC CHARACTERISTICS (VDD = 3.3V unless noted) 30 1.5 1.5 60 190 0.8 to 2.0V 2.0 to 0.8V At 1.4V 40 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. CMOS level input. Nominal trip point is VDD/2 for 3.3 V or 5 V operation. External Components The MK2704 requires a minimum number of external components for proper operation. For a crystal input, one load capacitor should be connected from each of the X1 and X2 pins to ground. The value (in pF) of each crystal load capacitor should equal (CL -16)*2, where CL is the crystal's load (correlation) capacitance in pF. 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 a clock input, connect to X1 and leave X2 unconnected. Decoupling capacitors of 0.01F should be connected between VDD and GND on pins 2 and 3, as close to the MK2704 as possible. A series termination resistor of 33 may be used for the clock output. MDS 2704 A 3 Revision 062700 Integrated Circuit Systems, Inc. * 525 Race Street * San Jose *CA*95126*(408) 295-9800tel * www.icst.com PRELIMINARY INFORMATION I C R O C LOC K MK2704 PLL 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 D A1 e C h x 45 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 A L B Ordering Information Part/Order Number MK2704S MK2704STR Marking MK2704S MK2704S Shipping packaging tubes tape and reel Package 8 pin SOIC 8 pin SOIC Temperature 0 to 70 C 0 to 70 C While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Inc. (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 2704 A 4 Revision 062700 Integrated Circuit Systems, Inc. * 525 Race Street * San Jose *CA*95126*(408) 295-9800tel * www.icst.com |
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