alliance semiconductor ? preliminary specification as80m2182 jul., 2003 pulsecore ? a division of alliance semiconductor revision a 3160 de la cruz blvd., suite 200 santa clara ca 95054 tel (408) 748-6988 fax (408) 748-0009 1 of 5 http://www.pulsecore.com ? lcd panel emi reduction ic features ? fcc approved method of emi attenuation ? provides up to 15 db emi reduction ? generates a 1x low emi spread spectrum clock from the input frequency ? optimized for frequency range: as80m2182: 25 mhz to 210 mhz ? internal loop filter minimizes external components and board space ? center spread ? low inherent cycle-to-cycle jitter ? 4 spread % selections: +/- 0.25% to +/- 1.875% ? 3.3v operating voltage ? cmos/ttl compatible inputs and outputs ? low power cmos design ? supports notebook vga and other lcd timing controller applications ? products are available for industrial temperature range. ? available in 8 pin soic and tssop product description the as80m2182 is a versatile spread spectrum frequency modulator designed specifically for a wide range of input clock frequencies from 25 to 210 mhz (see table 1). the as80m2182 can generate an emi reduced clock from an osc or a system generated clock. the as80m2182 offer a center spread clock and with a percentage deviation from +/- 0.25% to +/- 1.875%. the as80m2182 reduces electromagnetic interference (emi) at the clock source, allowing a system wide emi reduction for all the down stream clocks and data dependent signals. the as80m2182 allows significant system cost savings by reducing the number of circuit board layers, ferrite beads, shielding, and other passive components that are traditionally required to pass emi regulations. the as80m2182 modulates the output of a single pll in order to ?spread? the bandwidth of a synthesized clock, thereby decreasing the peak amplitudes of its harmonics. this results in significantly lower system emi compared to the typical narrow band signal produced by oscillators and most clock generators. lowering emi by increasing a signal?s bandwidth is called ?spread spectrum clock generation?. the as80m2182 uses the most efficient and optimized modulation profile approved by the fcc and is implemented by using a proprietary all- digital method. applications the as80m2182 is targeted towards emi management for memory and lvds interfaces in mobile graphic chipsets and high-speed digital applications such as pc peripheral devices, consumer electronics, and embedded controller systems.
alliance semiconductor ? preliminary specification as80m2182 jun., 2003 pulsecore ? a division of alliance semiconductor revision a 3160 de la cruz blvd., suite 200 santa clara ca 95054 tel (408) 748-6988 fax (408) 748-0009 2 of 5 http://www.pulsecore.com ? figure 1 ? as80m2182 pin diagrams s1 vdd s0 modout fs1 fs0 xin gnd as80m2182 figure 2 ? as80m2182 block diagram as80m2182 block diagram
alliance semiconductor ? preliminary specification as80m2182 jun., 2003 pulsecore ? a division of alliance semiconductor revision a 3160 de la cruz blvd., suite 200 santa clara ca 95054 tel (408) 748-6988 fax (408) 748-0009 3 of 5 http://www.pulsecore.com ? table 1- input frequency and modulation rate part number fs1 (pin 8) fs0 (pin 7) frequency range 0 0 25 mhz to 50 mhz 0 1 50 mhz to 103 mhz 1 0 75 mhz to 150 mhz as80m2182 1 1 160 mhz to 210 mhz table 2 - spread deviation selections part number s1 (pin 3) s0 (pin 4) spread deviation 0 0 +-0.25% 0 1 +/- 0.625% 1 0 +/- 1.00% as80m2182 1 1 +/- 1.875% pin description pin # name type description 1 xin i connect to externally generated clock signal. 2 gnd p ground. 3 s1 i spread range select. digital logic input used to select frequency deviation (see table 2). this pin has an internal pull-up resistor. 4 s0 i spread range select. digital logic input used to select frequency deviation (see table 2). this pin has an internal pull-up resistor. 5 modout o spread spectrum low emi output 6 vdd p connect to +3.3v. 7 fs0 i frequency range select. digital logic input used to select frequency range (see table 1). this pin has an internal pull-up resistor. 8 fs1 i frequency range select. digital logic input used to select frequency range (see table 1). this pin has an internal pull-up resistor.
alliance semiconductor ? preliminary specification as80m2182 jun., 2003 pulsecore ? a division of alliance semiconductor revision a 3160 de la cruz blvd., suite 200 santa clara ca 95054 tel (408) 748-6988 fax (408) 748-0009 4 of 5 http://www.pulsecore.com ? absolute maximum ratings symbol parameter rating unit v dd , v in voltage on any pin with respect to gnd -0.5 to +7.0 v t stg storage temperature -65 to +125 oc t a operating temperature 0 to +70 oc dc electrical characteristics symbol parameter min typ max unit v il input low voltage gnd ? 0.3 - 0.8 v v ih input high voltage 2.0 - vdd+0.3 v i il input low current - - -35 a i ih input high current - - 35 a i xol xout output low current (@ 0.4v, v dd = 3.3v) - tbd - ma i xoh xout output high current (@ 2.5v, v dd = 3.3v) - tbd - ma v ol output low voltage (v dd =3.3v, i ol = 20 ma) - - 0.4 v v oh output high voltage (v dd =3.3v, i oh = 20 ma) 2.5 - - v i dd static supply current standby mode - 0.6 - ma i cc dynamic supply current normal mode (3.3v and 10 pf loading) 8.46 12 17.78 ma v dd operating voltage 2.7 3.3 3.7 v t on power up time (first locked clock cycle after power up) - 0.18 - ms z out clock output impedance - 50 - ? ac electrical characteristics symbol parameter min typ max unit f in input frequency 25 - 210 mhz f out output frequency 25 - 210 mhz t lh note 1 output rise time (measured at 0.8v to 2.0v) 0.7 0.9 1.1 ns t hl note 1 output fall time (measured at 2.0v to 0.8v) 0.6 0.8 1.0 ns t jc jitter (cycle to cycle) - - 360 ps t d output duty cycle 45 50 55 % note1: t lh and t hl are measured into a capacitive load of 15pf
alliance semiconductor ? preliminary specification as80m2182 jun., 2003 pulsecore ? a division of alliance semiconductor revision a 3160 de la cruz blvd., suite 200 santa clara ca 95054 tel (408) 748-6988 fax (408) 748-0009 5 of 5 http://www.pulsecore.com ? figure 3 - mechanical package outline (8 pin soic) d a1 e b a a2 top as80m 2180 lot number bottom yyww h a c l e figure 4 - mechanical package outline (8 pin tssop) d a1 e b a a2 h a c l e as80m 2180 lot # yyww inches millimeters symbol min nor max min nor max a 0.057 0.064 0.071 1.45 1.63 1.80 a1 0.004 0.007 0.010 0.10 0.18 0.25 a2 0.053 0.061 0.069 1.35 1.55 1.75 b 0.012 0.016 0.020 0.31 0.41 0.51 c 0.004 0.006 0.001 0.10 0.15 0.25 d 0.186 0.194 0.202 4.72 4.92 5.12 e 0.148 0.156 0.164 3.75 3.95 4.15 e 0.050 bsc 1.27 bsc h 0.224 0.236 0.248 5.70 6.00 6.30 l 0.012 0.020 0.028 0.30 0.50 0.70 a 0 5 8 0 5 8 note: controlling dimensions are millimeters. soic - 0.074 g rams unit wei g ht inches millimeters symbol min nor max min nor max a - - 0.047 - - 1.10 a1 0.002 - 0.006 0.05 - 0.15 a2 0.031 0.039 0.041 0.80 1.00 1.05 b 0.007 - 0.012 0.19 - 0.30 c 0.004 - 0.008 0.09 - 0.20 d 0.114 0.118 0.122 2.90 3.00 3.10 e 0.169 0.173 0.177 4.30 4.40 4.50 e 0.026 bsc 0.65 bsc h 0.244 0.252 0.260 6.20 6.40 6.60 l 0.018 0.024 0.030 0.45 0.60 0.75 a 0 - 8 0 - 8 note: controlling dimensions are millimeters. tssop - 0.034 grams unit weight
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