ASM3P2107A

ASM3P2107A Peak EMI Reducing Solution Features • FCC approved method of EMI attenuation. • Generates a 1X low EMI spread spectrum clock of the input frequency. • Input frequency range: 12MHz to 22MHz. • Internal loop filter minimizes external components and board space. • Frequency deviation: - 0.8%( Typ) @ 20MHz. • Low cycle-to-cycle jitter. • 5.0V ± 5% operating voltage range. • TTL or CMOS compatible outputs. by reducing the number of circuit board layers, ferrite beads, shielding, and other passive components that are traditionally required to pass EMI regulations. The ASM3P2107A uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method. The ASM3P2107A 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.’ • Available in 8-pin TSSOP and SOIC package. Product Description The ASM3P2107A is a versatile spread spectrum frequency modulator designed specifically for input clock frequencies from 12MHz to 22MHz. The ASM3P2107A can generate an EMI reduced clock from crystal, ceramic resonator, or system clock. The ASM3P2107A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The ASM3P2107A allows significant system cost savings Applications The ASM3P2107A is targeted towards EMI management for high speed digital applications such as PC peripheral devices, consumer electronics and embedded controller systems. Block Diagram VDD Modulation XIN XOUT Crystal Oscillator Frequency Divider Feedback Divider Phase Detector Loop Filter VCO PLL Output Divider CLOCKOUT GND ©2010 SCILLC. All rights reserved. JANUARY 2010 – Rev. 1 Publication Order Number: ASM3P2107/D ASM3P2107A Pin Configuration XIN / CLKIN XOUT 1 2 ASM3P2107A 8 NC 7 NC 6 VDD 5 CLOCKOUT GND 3 NC 4 Pin Description Pin# 1 2 3 4 5 6 7 8 Pin Name XIN / CLKIN XOUT GND NC CLOCKOUT VDD NC NC Type I O P O P - Description 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. If using an external reference, this pin must be left unconnected. Ground to entire chip. No connect. Spread spectrum low EMI output. Power supply for the entire chip (5V). No connect. No connect. Absolute Maximum Ratings Symbol VDD, VIN TSTG TA Ts TJ TDV Storage temperature Operating temperature Parameter Rating -0.5 to +7.0 -65 to +125 0 to 70 260 150 2 Unit V ° C ° C ° C ° C KV Voltage on any pin with respect to Ground Max. Soldering Temperature (10 sec) Junction Temperature Static Discharge Voltage (As per JEDEC STD22- A114-B) Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect device reliability. Operating Conditions Parameter VDD TA CL CIN Supply Voltage Operating Temperature (Ambient Temperature) Load Capacitance Input Capacitance Description Min 4.75 -40° Max 5.25 +85 15 7 Unit V ° C pF pF Rev. 1 | Page 2 of 6 | www.onsemi.com ASM3P2107A DC Electrical Characteristics Symbol Parameter 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 (@ 0.4, VDD = 5V) XOUT output high current (@2.5V, VDD = 5V) Output low voltage (VDD = 5V, IOL = 20mA) Output high voltage (VDD = 5V, IOH = 20mA) Dynamic supply current normal mode (5V, 18MHz and 15pF loading) Static supply current standby mode Operating voltage Power up time (first locked clock cycle after power up) Clock out impedance 2.5 40 40 4.75 5.0 0.18 50 5.25 Min GND – 0.3 2.0 Typ Max 0.8 VDD + 0.3 Unit V V µA µA mA mA 44 66 3 3 0.4 V V mA µA V mS AC Electrical Characteristics Symbol fIN MODOUT fd tLH* tHL* tJC tD Input frequency Output frequency Parameter Min 12 12 Typ Max 22 22 Unit MHz MHz % pS pS Frequency Deviation Input Frequency = 12MHz Input Frequency = 22MHz 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 45 -2.13 -0.62 440 300 ±360 50 55 pS % * VDD = +5V, Input Frequency = 18MHz, tLH and tHL are measured into a capacitive load of 15pF Rev. 1 | Page 3 of 6 | www.onsemi.com ASM3P2107A Package Information 8-Pin SOIC Package E H D A2 A θ e A 1 B C L D Dimensions Inches Min A1 A A2 B C D E e H L θ 0.004 0.053 0.049 0.012 0.007 Symbol Millimeters Max Min 0.10 1.35 1.25 0.31 0.18 4.90 BSC 3.91 BSC 1.27 BSC 6.00 BSC 0.41 0° 1.27 8° Max 0.25 1.75 1.50 0.51 0.25 0.010 0.069 0.059 0.020 0.010 0.193 BSC 0.154 BSC 0.050 BSC 0.236 BSC 0.016 0° 0.050 8° Rev. 1 | Page 4 of 6 | www.onsemi.com ASM3P2107A 8-Pin TSSOP H E D A2 A θ e B A1 L C Dimensions Symbol Min A A1 A2 B c D E e H L θ 0.020 0° 0.002 0.033 0.008 0.004 0.114 0.169 0.026 BSC 0.252 BSC 0.028 8° 0.50 0° Inches Max 0.043 0.006 0.037 0.012 0.008 0.122 0.177 0.05 0.85 0.19 0.09 2.90 4.30 Millimeters Min Max 1.10 0.15 0.95 0.30 0.20 3.10 4.50 0.65 BSC 6.40 BSC 0.70 8° Rev. 1 | Page 5 of 6 | www.onsemi.com ASM3P2107A Ordering Codes Part Number ASM3P2107AF-08SR Marking AEE Package 8-PIN SOIC, TAPE AND REEL, Pb Free Temperature 0° to +70° C C A “microdot” placed at the end of last row of marking or just below the last row toward the center of package indicates Pb-free. Licensed under US patent #5,488,627, #6,646,463 and #5,631,920. Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003 are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes ON Semiconductor and without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. 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