ASM3P2184A-08TT

November 2003 rev 1.0 LCD Panel 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 70 MHz. Internal loop filter minimizes external components and board space. Spread option: Center Spread. 2 spread frequency deviation selections: o ±0.625% or ±1.875% Low inherent cycle-to-cycle jitter. 3.3V operating voltage range. Low power CMOS design. Supports notebook VGA and other LCD timing controller applications. Product available for industrial temperature range. Available in 8-pin SOIC and TSSOP. ASM3P2184A The ASM3P2184A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The ASM3P2184A 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 ASM3P2184A uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method. The ASM3P2184A 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 ASM3P2184A is a versatile spread spectrum frequency modulators designed specifically for a wide range of input clock frequencies from 6MHz to 70MHz. (Refer Input Frequency and Modulation Rate Table). The ASM3P2184A can generate an EMI reduced clock from an OSC or a system generated clock. The ASM3P2184A offers a Center Spread clock percentage deviations; ±0.625% and ±1.675%. with 2 Applications The ASM3P2184A 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. November 2003 rev 1.0 ASM3P2184A Block Diagram 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 7 ASM3P2184A 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 November 2003 rev 1.0 ASM3P2184A 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 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 18 MHz to 35 MHz 40 MHz to 70 MHz Spread Deviation Selection Table Part Number ASM3P2184A SS% (pin 4) 0 1 Spread Deviation (%) ± 0.625 ± 1.875 LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 3 of 9 November 2003 rev 1.0 ASM3P2184A 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 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 9 November 2003 rev 1.0 ASM3P2184A AC Electrical Characteristics Symbol XIN 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 0.7 0.6 45 Typ 0.9 0.8 50 Max 70 70 1.1 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 9 November 2003 rev 1.0 ASM3P2184A Package Information 8-Pin SOIC E H D A2 A θ e B A 1 C L Symbol Dimensions in inches Dimensions in millimeters Min Max 0.071 0.010 0.069 0.020 0.01 0.202 0.164 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 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° D LCD Panel EMI Reduction IC 6 of 9 Notice: The information in this document is subject to change without notice. November 2003 rev 1.0 ASM3P2184A 8-Pin TSSOP H E D A2 A θ e B A1 L C Dimensions in inches Dimensions in millimeters 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 0.05 0.80 0.19 0.09 2.90 4.30 Max Min Max 1.10 0.15 1.05 0.30 0.20 3.10 4.50 0.65 BSC 6.20 0.45 0° 6.60 0.75 8° 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 9 November 2003 rev 1.0 ASM3P2184A Ordering Information Ordering Code ASM3P2184A-08ST ASM3P2184A-08SR ASM3P2184A-08TT ASM3P2184A-08TR Package Name 8-Pin SOIC 8-Pin SOIC 8-Pin TSSOP 8-Pin TSSOP Package Type Tube Tape and Reel Tube Tape and Reel ASM3P2184A-08-TR OR - SOT23/T/R TT – TSSOP, TUBE TR – TSSOP, T/R QT - QFN, TUBE BT - BGA, TUBE BR – BGA, T/R ST – SOIC, TUBE SR - SOIC, T/R QR – QFN, T/R VT – TVSOP, TUBE VR – TVSOP, T/R JR – SSOP, T/R JT - SSOP, TUBE PIN COUNT PART NUMBER X = Automotive I = Industrial P or n/c = Commercial 1 – reserved 2 - Non PLL based 3 – EMI Reduction 4 – DDR support products 5 – STD Zero Delay Buffer 6 – power management 7 – power management 8 – power management 9 – Hi performance 0 - reserved Alliance Semiconductor Mixed Signal Product LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 8 of 9 November 2003 rev 1.0 ASM3P2184A 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: ASM3P2184A 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. 9 of 9