ASM3P2183A

September 2003 ASM3P2183A rev 1.0 EMI Reduction IC Features FCC approved method of EMI attenuation. Provides up to 15dB EMI reduction. Generates a 1X low EMI spread spectrum clock of the input frequency. Input frequency range: 6MHz to 103MHz. Internal loop filter minimizes external components and board space. Selectable spread options: Down and Center Spread 2 spread frequency deviation selections: o -1.25% or ± 0.42% Low inherent cycle-to-cycle jitter. 3.3V operating voltage range. 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. The ASM3P2183A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The ASM3P2183A 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 ASM3P2183A uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method. The ASM3P2183A modulates the output of a single PLL in order to “spread” the bandwidth of a synthesized clock, and more importantly, decreases 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 frequency generators. Lowering EMI by increasing a signal’s bandwidth is called ‘spread spectrum clock generation’. Product Description The ASM3P2183 is a versatile spread spectrum frequency modulators designed specifically for a wide range of input clock frequencies from 6MHz to 103MHz. (Refer Input Frequency and Modulation Rate Table). The ASM3P2183A can generate an EMI reduced clock from an OSC or a system generated clock. The ASM3P2183A offers a Down Spread clock with a percentage deviation of -1.25% and a Center Spread clock with a percentage deviation of ± 0.42%. Applications The ASM3P2183A 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 2575, Augustine Drive • Santa Clara, CA • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com Notice: The information in this document is subject to change without notice. September 2003 rev 1.0 Block Diagram ASM3P2183A FS0 FS1 SS% VDD Modulation XIN Crystal Oscillator XOUT Frequency Divider Feedback Divider PLL Phase Detector Loop Filter VCO Output Divider ModOUT VSS Pin Configuration XIN XOUT GND 1 8 FS1 FS0 VDD ModOUT 2 ASM3P2183A 7 3 6 SS% 4 5 LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 2 of 9 September 2003 rev 1.0 Pin Description Pin# 1 2 3 4 5 6 7 8 Pin Name XIN XOUT GND SS% ModOUT VDD FS0 FS1 Type I I P I O P I I Description ASM3P2183A Crystal connection or external frequency input. This pin has dual functions. It can be connected to either an external crystal or an external reference clock. Crystal connection. Input connection for an external crystal. If using an external reference, this pin must be left unconnected. Ground to entire chip. Spread range select. Digital logic input used to select frequency deviation (Refer Spread Deviation Selection Table). This pin has an internal pull-up resistor. Spread spectrum low EMI output. Power supply for the entire chip (3.3V). Frequency range select. Digital logic input used to select frequency range (Refer Input Frequency and Modulation Rate Table). This pin has an internal pull-up resistor. Frequency range select. Digital logic input used to select frequency range (Refer Input Frequency and Modulation Rate Table). This pin has an internal pull-up resistor. Input Frequency and Modulation Rate Table FS1 (pin 8) 0 0 1 1 FS0 (pin 7) 0 1 0 1 Frequency Range 6 MHz to 13 MHz 12 MHz to 25 MHz 25 MHz to 50 MHz 50 MHz to 103 MHz Spread Deviation Selection Table SS% (pin 4) 0 1 Spread Deviation (%) - 1.25 ± 0.42 LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 3 of 9 September 2003 rev 1.0 Absolute Maximum Ratings Symbol VDD, VIN TSTG TA Parameter Voltage on any pin with respect to GND Storage temperature Operating temperature Rating -0.5 to + 7.0 -65 to +125 ASM3P2183A Unit V °C 0 to 70 °C Note: These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for extended periods may affect device reliability. DC Electrical Characteristics Symbol VIL VIH IIL IIH IXOL IXOH VOL VOH ICC IDD VDD tON ZOUT Input low voltage Input high voltage Input low current Input high current XOUT Output low current (@ 0.4V, VDD = 3.3V) XOUT Output high current (@ 2.5V, VDD = 3.3V) Output low voltage (VDD = 3.3V, IOL = 20mA) Output high voltage (VDD = 3.3V, IOH = 20mA) Dynamic supply current Normal mode (3.3V and 10pF loading) Static supply current Standby mode Operating voltage Power up time (first locked clock cycle after power up) Clock out impedance Parameter Min GND – 0.3 2.0 2.5 8.46 Typ TBD TBD 12 0.6 2.7 3.3 0.18 50 3.7 Max 0.8 VDD + 0.3 -35 35 0.4 17.78 Unit V V µA µA mA mA V V mA mA V mS Ω LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 4 of 8 September 2003 rev 1.0 AC Electrical Characteristics Symbol fIN ModOUT tLH* tHL* tJC TD Input frequency Output frequency Output rise time (measured at 0.8V to 2.0V) Output fall time (measured at 2.0V to 0.8V) Jitter (cycle to cycle) Output duty cycle Parameter Min 6 6 1.2 0.8 45 ASM3P2183A Typ 1.32 0.9 50 Max 103 103 1.4 1.0 200 55 Unit MHz MHz ns ns ps % * tLH and tHL are measured into a capacitive load of 15pF LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 5 of 8 September 2003 rev 1.0 Package Information ASM3P2183A 8-Pin SOIC E H D A2 A θ e B A 1 C L D Symbol Dimensions in inches Min Max 0.071 0.010 0.069 0.020 0.01 0.202 0.164 Dimensions in millimeters Min 1.45 0.10 1.35 0.31 0.10 4.72 3.75 1.27 BSC 5.70 0.30 0° 6.30 0.70 8° Max 1.80 0.25 1.75 0.51 0.25 5.12 4.15 A A1 A2 B C D E e H L θ 0.057 0.004 0.053 0.012 0.004 0.186 0.148 0.050 BSC 0.224 0.012 0° 0.248 0.028 8° LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 6 of 8 September 2003 rev 1.0 ASM3P2183A 8-Pin TSSOP H E D A2 A θ e B A1 L C Dimensions in inches Symbol A A1 A2 B C D E e H L θ Min 0.047 0.002 0.031 0.007 0.004 0.114 0.169 0.006 0.041 0.012 0.008 0.122 0.177 Max Dimensions in millimeters Min Max 1.10 0.05 0.80 0.19 0.09 2.90 4.30 0.65 BSC 6.20 0.45 0° 6.60 0.75 8° 0.15 1.05 0.30 0.20 3.10 4.50 0.026 BSC 0.244 0.018 0° 0.260 0.030 8° LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 7 of 8 September 2003 rev 1.0 ASM3P2183A Alliance Semiconductor Corporation 2595, Augustine Drive, Santa Clara, CA 95054 Tel# 408-855-4900 Fax: 408-855-4999 www.alsc.com Copyright © Alliance Semiconductor All Rights Reserved Preliminary Information Part Number: ASM3P2183A Document Version: v1.0 © Copyright 2003 Alliance Semiconductor Corporation. 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Alliance does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure may reasonably be expected to result in significant injury to the user, and the inclusion of Alliance products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use. LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 8 of 8