November 2003 ASM3P2190A rev 1.0 Peak Reducing EMI Solution Features • Generates an EMI optimized clocking • • • • • • signal at the output. Selectable output frequency range. Single 1.25% or 2.4% down spread output. Integrated loop filter components. Operates with a 3.3V supply. Low-power CMOS design. Available in 8-pin SOIC and 8-pin TSSOP packages. Key Specifications Description Specification Supply voltages VDD = 3.3V ± 5% Frequency range 6 MHz ≤ 30 MHz Cycle-to-cycle jitter 325 ps (typical) Selectable spread percentage Output duty cycle -1.25% or –2.4% 40/60% (worst case) Output rise and fall time 5ns (maximum) Product Description The ASM3P2190A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2190A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The ASM3P2190A allows significant system cost savings by reducing the number of circuit board layers and shielding that are traditionally required to pass EMI regulations. The ASM3P2190A 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 ASM3P2190A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all-digital method. Applications The ASM3P2190A is targeted towards notebook LCD displays, other displays using an LVDS interface, PC peripheral devices and embedded systems. Simplified Block Diagram 3.3V X1 X2 Spread spectrum output (EMI suppressed) Pin Diagram CLKIN / X1 1 NC / X2 2 8 NC 7 FS1 ASM3P2190A GND 3 6 VDD SS% 4 5 CLKOUT Alliance Semiconductor 2595, Augustine Drive • Santa Clara • CA 95054 • 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 ASM3P2190A rev 1.0 Modulation Width Selection SS% Output 0 FIN ≥ FOUT ≥ FIN – 1.25% 1 FIN ≥ FOUT ≥ FIN – 2.4% Frequency Range Selection FS1 Modulation Rate 0 6 ≤ FIN ≤10 1 18 ≤ FIN ≤ 30 Pin Description Pin# Pin Name Type Description 1 CLKIN or X1 I 2 NC OR X2 O 3 GND G Ground to entire chip. 4 SS% I Modulation width selection. When spread spectrum feature is turned on, this pin is used to select the amount of variation and peak EMI reduction that is desired on the output signal. Internal pull-up resistor. 5 CLKOUT O Output modulated frequency. Copy of the un-modulated input clock. 6 VDD P Power supply for the entire chip (3.3V). 7 FS1 I Frequency selection bit 1. This pin selects the frequency range of operation. (Refer to the Frequency Range Selection Table). This pin has an internal pull-up resistor. 8 NC - No connect. Crystal connection or external reference frequency input. This pin has dual functions. It can be connected to either an external crystal or an external reference clock. Crystal connection. Connection for an external crystal. If using an external reference, this pin must be left unconnected. Peak Reducing EMI Solution Notice: The information in this document is subject to change without notice. 2 of 7 November 2003 ASM3P2190A rev 1.0 Absolute Maximum Ratings Symbol VDD, VIN Parameter Voltage on any pin with respect to GND Rating Unit -0.5 to + 7.0 V TSTG Storage temperature -65 to +125 °C TA Operating temperature 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 Parameter VIL Input low voltage VIH Input high voltage Input low current (pull-up resistors on inputs SS%, FS1) Input high current IIL IIH Min Typ Max Unit GND – 0.3 - 0.8 V 2.0 - VDD + 0.3 V - - -27 µA - - 18 µA IXOL XOUT output low current (@ 0.4V, VDD = 3.3V) - 3 - mA IXOH XOUT output high current (@2.5V, VDD = 3.3V) - 4 - mA VOL Output low voltage (VDD = 3.3V, IOL = 4mA) - - 0.4 V VOH Output high voltage (VDD = 3.3V, IOH = 4mA) Dynamic supply current normal mode (3.3V and 10pF loading) Static supply current standby mode 2.5 - - V 8 21 35 mA - 0.8 - µA Operating voltage Power up time (first locked clock cycle after power up) Clock output impedance 2.8 3.3 3.7 V - 0.18 - mS - 50 - Ω ICC IDD VDD tON ZOUT AC Electrical Characteristics Symbol Parameter Min Typ Max Unit CLKIN Input frequency 6 - 30 MHz CLKOUT Output frequency 6 - 30 MHz tLH* Output rise time (measured at 0.8V to 2.0V) 1.2 1.3 1.4 ns tHL* Output fall time (measured at 2.0V to 0.8V) 0.8 0.9 1.0 ns tJC Jitter (cycle to cycle) - - 325 ps 45 50 55 % tD Output duty cycle *tLH and tHL are measured into a capacitive load of 15pF Peak Reducing EMI Solution Notice: The information in this document is subject to change without notice. 3 of 7 November 2003 ASM3P2190A rev 1.0 Package Information: 8-Pin SOIC H E D A2 A C θ e A1 B Symbol Dimensions in inches D L Dimensions in millimeters Min Max Min Max A 0.057 0.071 1.45 1.80 A1 0.004 0.010 0.10 0.25 A2 0.053 0.069 1.35 1.75 B 0.012 0.020 0.31 0.51 C 0.004 0.01 0.10 0.25 D 0.186 0.202 4.72 5.12 E 0.148 0.164 3.75 4.15 e 0.050 BSC 1.27 BSC H 0.224 0.248 5.70 6.30 L 0.012 0.028 0.30 0.70 0° 8° 0° 8° Peak Reducing EMI Solution Notice: The information in this document is subject to change without notice. 4 of 7 November 2003 ASM3P2190A rev 1.0 8-Pin TSSOP H E D A2 A C θ e A1 L B Symbol Dimensions in inches Min Max Dimensions in millimeters Min Max A 0.047 A1 0.002 0.006 0.05 0.15 A2 0.031 0.041 0.80 1.05 B 0.007 0.012 0.19 0.30 C 0.004 0.008 0.09 0.20 D 0.114 0.122 2.90 3.10 E 0.169 0.177 4.30 4.50 e 1.10 0.026 BSC 0.65 BSC H 0.244 0.260 6.20 6.60 L 0.018 0.030 0.45 0.75 θ 0° 8° 0° 8° Peak Reducing EMI Solution Notice: The information in this document is subject to change without notice. 5 of 7 November 2003 ASM3P2190A rev 1.0 Ordering Codes Quantity per reel Ordering Number Marking Package Type ASM3P2190A-08ST ASM3P2190A 8-pin SOIC, tube ASM3P2190A-08SR ASM3P2190A 8-pin SOIC, tape and reel ASM3P2190A-08TT ASM3P2190A 8-pin TSSOP, tube ASM3P2190A-08TR ASM3P2190A 8-pin TSSOP, tape and reel Temperature 0° C to 70°C 2500 0° C to 70°C 0° C to 70°C 2500 0° C to 70°C Ordering Information A S M 3 P 2 1 9 0 A - 0 8 S T OR - SOT23/T/R TT – TSSOP, TUBE TR - TSSOP, T/R VT – TVSOP, TUBE VR – TVSOP, T/R ST – SOIC, TUBE SR - SOIC, T/R QR – QFN, T/R QT - QFN, TUBE BT - BGA, TUBE BR – BGA, T/R PIN COUNT PART NUMBER X = Automotive I = Industrial P or n/c = Commercial 1 – reserved 6 – power management 2 - Non PLL based 7 – power management 3 – EMI Reduction 8 – power management 4 – DDR support products 9 – Hi performance 5 – STD Zero Delay Buffer 0 - reserved Alliance Semiconductor Mixed Signal Product Peak Reducing EMI Solution Notice: The information in this document is subject to change without notice. 6 of 7 November 2003 ASM3P2190A rev 1.0 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 Part Number: ASM3P2190A Document Version: v1.0 © Copyright 2003 Alliance Semiconductor Corporation. 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