ics548-02 mp3 audio clock mds548-02b 1 revision 11129 printed 11/17/99 integrated circuit systems, inc. ?525 race street ?san jose ?a?5126?408) 295-9800tel ?www.icst.com preliminary information block diagram description features the ics548-02 is a low cost, low jitter, high performance clock synthesizer designed to produce audio sampling rates for mp3 systems. using ics?patented analog/digital phase-locked loop (pll) techniques, the device uses an inexpensive 14.7456 mhz or 3.6864 mhz crystal input to produce all of the popular audio sampling frequencies. with the 3.6864 mhz input, the chip provides a clock output, allowing it to drive the cirrus arm controller. ics manufactures the largest variety of multimedia clock synthesizers for all applications. consult ics to eliminate vcxos, crystals and oscillators from your board. ?packaged in 16 pin narrow soic ?ideal for cirrus logic? mp3 chips ?replaces multiple oscillators ?3.3v or 5v operation ?uses an inexpensive 3.6864 mhz or 14.7456 mhz crystal, or clock input ?supports 32 khz, 44.1 khz, 48 khz, and 96 khz audio sampling rates ?provides 128fs and 256fs clocks ?zero ppm synthesis error ?advanced, low power, sub-micron cmos process crystal oscillator pll/clock synthesis circuitry 14.7456 mhz or 3.6864 mhz crystal or clock x1 x2 output buffer clk s3:s0 4 output buffer refout optional crystal capacitors
ics548-02 mp3 audio clock mds548-02b 2 revision 11129 printed 11/17/99 integrated circuit systems, inc. ?525 race street ?san jose ?a?5126?408) 295-9800tel ?www.icst.com preliminary information pin descriptions key: i = input; o = output; p = power supply connection; xi, xo = crystal connections the input pins s3:s0 lack pull-ups, so they cannot be left floating. tie directly to vdd or gnd. for a clock input, connect the input to x1, and leave x2 unconnected (floating). pin assignment number name type description 1 x1 xi crystal connection. connect to a parallel mode 14.7456 mhz or 3.6864 mhz crystal. 2, 3, 4 vdd p connect to +3.3v or +5v. must be same at all vdds. 5, 6 gnd p connect to ground. 7 s3 i frequency select pin 3. determines clock outputs per table above. 8 s2 i frequency select pin 2. determines clock outputs per table above. 9, 11, 15 dc - don't connect. do not connect anything to these pins. 10 clk o audio clock output set by status of s0-s3. see table above. 12 s1 i frequency select pin 1. determines clock outputs per table above. 13 s0 i frequency select pin 0. determines clock outputs per table above. 14 refout o buffered reference crystal output clock for 3.6864 mhz crystal (or clock) per table. 16 x2 xo crystal connection. connect to a parallel mode 14.7456 mhz or 3.6864 mhz crystal. key: 0 = connect directly to gnd 1 = connect directly to vdd 16 15 14 13 16 pin narrow (150 mil) soic 12 11 10 9 1 2 3 4 5 6 7 8 ics548-02 vdd gnd x2 x1 vdd s2 gnd s3 s1 dc clk dc dc s0 s3 s2 s1 s0 input (mhz) clk (mhz) refout pin 7 pin 8 pin 12 pin 13 pins 1, (16) pin 10 pin 14 0 0 0 0 14.7456 4.096 off (low) 0 0 0 1 14.7456 5.6448 off (low) 0 0 1 0 14.7456 6.144 off (low) 0 0 1 1 14.7456 16.9344 off (low) 0 1 0 0 14.7456 8.192 off (low) 0 1 0 1 14.7456 11.2896 off (low) 0 1 1 0 14.7456 12.288 off (low) 0 1 1 1 14.7456 24.576 off (low) 1 0 0 0 3.6864 4.096 3.6864 1 0 0 1 3.6864 5.6448 3.6864 1 0 1 0 3.6864 6.144 3.6864 1 0 1 1 test test test 1 1 0 0 3.6864 8.192 3.6864 1 1 0 1 3.6864 11.2896 3.6864 1 1 1 0 3.6864 12.288 3.6864 1 1 1 1 3.6864 2.048 3.6864 output clock select table vdd refout
ics548-02 mp3 audio clock mds548-02b 3 revision 11129 printed 11/17/99 integrated circuit systems, inc. ?525 race street ?san jose ?a?5126?408) 295-9800tel ?www.icst.com preliminary information parameter conditions minimum typical maximum units absolute maximum ratings (note 1) absolute maximum ratings (note 1) supply voltage, vdd referenced to gnd 7 v inputs and clock outputs referenced to gnd -0.5 vdd+0.5 v ambient operating temperature 0 70 ? soldering temperature max of 10 seconds 260 ? storage temperature -65 150 ? dc characteristics (vdd = 3.3v unless noted) dc characteristics (vdd = 3.3v unless noted) core operating voltage, vdd 3.0 5.5 v input high voltage, vih, x1 pin only clock input only (vdd/2)+1 vdd/2 v input low voltage, vil, x1 pin only clock input only vdd/2 (vdd/2)-1 v input high voltage, vih 2 v input low voltage, vil 0.8 v output high voltage, voh ioh=-12ma 2.4 v output low voltage, vol iol=12ma 0.4 v output high voltage, voh, cmos level ioh=-4ma vdd-0.4 v operating supply current, idd no load, 14.7456 input 7 ma short circuit current clk output ?0 ma input capacitance s0, s1, s2, s3 7 pf frequency synthesis error all selections 0 ppm ac characteristics (vdd = 3.3v unless noted) ac characteristics (vdd = 3.3v unless noted) input crystal or clock frequency 14.7456 or 3.6864 mhz output clock rise time 0.8 to 2.0v 1.5 ns output clock fall time 2.0 to 0.8v 1.5 ns output clock duty cycle at vdd/2 40 50 60 % maximum absolute jitter, short term ?00 ps one sigma jitter 35 ps electrical specifications note: 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 ics548-02 requires a minimum number of external components for proper operation. a decoupling capacitor of 0.01? should be connected between vdd and gnd on pins 3 and 5, as close to the ics548- 02 as possible. other vdds can be connected to pin 3. a series termination resistor of 33 w may be used for each clock output. any unused clock outputs should be left unconnected. the input crystal must be connected as close to the chip as possible. the input crystal should be fundamental mode, parallel resonant, with a load capacitance of 18 pf. for other values of load (or correlation) capacitance, the crystal can be tuned with two identical capacitors to ground, as shown on the block diagram. the value of these two crystal caps should be equal to (c l -18)*2, where c l is the crystal load capacitance.
ics548-02 mp3 audio clock mds548-02b 4 revision 11129 printed 11/17/99 integrated circuit systems, inc. ?525 race street ?san jose ?a?5126?408) 295-9800tel ?www.icst.com preliminary information while the information presented herein has been checked for both accuracy and reliability, integrated circuit systems, incorporated (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. ordering information part/order number marking shipping packaging package temperature ics548m-02 ics548m-02 tubes 16 pin soic 0-70 ? ics548m-02t ics548m-02 tape and reel 16 pin soic 0-70 ? b d e h e a1 c a l package outline and package dimensions (for current dimensional specifications, see jedec publication no. 95.) 16 pin soic narrow inches inches millimeters millimeters symbol min max min max a 0.0532 0.0688 1.35 1.75 a1 0.0040 0.0098 0.10 0.24 b 0.0130 0.0200 0.33 0.51 c 0.075 0.098 1.91 2.40 d 0.3859 0.3937 9.80 10.00 e 0.1497 0.1574 3.80 4.00 e .050 bsc .050 bsc 1.27 bsc 1.27 bsc h 0.2284 0.2440 5.80 6.20 l 0.0160 0.0500 0.41 1.27
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