ASM3P2107AF-08SR

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. • 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 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.’ Applications The ASM3P2107A is targeted towards EMI management for high speed digital applications such as PC peripheral devices, consumer electronics and embedded controller systems. VDD Block Diagram PLL Modulation XIN XOUT Crystal Oscillator Frequency Divider Feedback Divider Phase Detector Loop Filter VCO Output Divider CLOCKOUT GND ©2010 SCILLC. All rights reserved. October 2010 – Rev. 2 Publication Order Number: ASM3P2107/D ASM3P2107A Pin Configuration XIN / CLKIN 1 XOUT 2 8 NC ASM3P2107A GND 3 NC 4 7 NC 6 VDD 5 CLOCKOUT Pin Description Pin# Pin Name Type Description 1 XIN / CLKIN I 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. 2 XOUT O Crystal connection. If using an external reference, this pin must be left unconnected. 3 GND P Ground to entire chip. 4 NC - No connect. 5 CLOCKOUT O Spread spectrum low EMI output. 6 VDD P Power supply for the entire chip (5V). 7 NC - No connect. 8 NC - No connect. Absolute Maximum Ratings Symbol VDD, VIN TSTG Parameter Rating Unit Voltage on any pin with respect to Ground -0.5 to +7.0 V Storage temperature -65 to +125 °C 0 to 70 °C TA Operating temperature Ts Max. Soldering Temperature (10 sec) 260 °C TJ Junction Temperature 150 °C 2 KV TDV 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 Description Min Max Unit Supply Voltage 4.75 5.25 V TA Operating Temperature (Ambient Temperature) -40° +85 °C CL Load Capacitance 15 pF CIN Input Capacitance 7 pF Rev. 1 | Page 2 of 6 | www.onsemi.com ASM3P2107A DC Electrical Characteristics Symbol Parameter Min Typ Max Unit VIL Input low voltage GND – 0.3 0.8 V VIH Input high voltage 2.0 VDD + 0.3 V IIL Input low current 44 µA IIH Input high current 66 µA IXOL XOUT output low current (@ 0.4, VDD = 5V) 3 mA IXOH XOUT output high current (@2.5V, VDD = 5V) 3 mA VOL Output low voltage (VDD = 5V, IOL = 20mA) VOH 2.5 IDD Output high voltage (VDD = 5V, IOH = 20mA) Dynamic supply current normal mode (5V, 18MHz and 15pF loading) Static supply current standby mode VDD Operating voltage 4.75 tON Power up time (first locked clock cycle after power up) ICC ZOUT 0.4 V fIN MODOUT fd tLH* Parameter 40 mA 40 µA 5.0 Clock out impedance AC Electrical Characteristics Symbol V Min 5.25 V 0.18 mS 50 Ω Typ Max Unit Input frequency 12 22 MHz Output frequency 12 22 MHz Input Frequency = 12MHz Input Frequency = 22MHz Output rise time (measured at 0.8V to 2.0V) -2.13 -0.62 440 Frequency Deviation tHL* Output fall time (measured at 2.0V to 0.8V) tJC Jitter (cycle to cycle) tD Output duty cycle * 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 % pS 300 45 50 pS ±360 pS 55 % ASM3P2107A Package Information 8-Pin SOIC Package H E D A2 A θ C D e A1 L B Dimensions Symbol Inches Millimeters Min Max Min Max A1 0.004 0.010 0.10 0.25 A 0.053 0.069 1.35 1.75 A2 0.049 0.059 1.25 1.50 B 0.012 0.020 0.31 0.51 C 0.007 0.010 0.18 0.25 D 0.193 BSC 4.90 BSC E 0.154 BSC 3.91 BSC e 0.050 BSC 1.27 BSC H 0.236 BSC 6.00 BSC L 0.016 0.050 θ 0° 8° 0.41 1.27 0° 8° Rev. 1 | Page 4 of 6 | www.onsemi.com ASM3P2107A 8-Pin TSSOP H E D A2 A θ e C A1 L B Dimensions Symbol Inches Min Millimeters Max A Min Max 0.043 1.10 A1 0.002 0.006 0.05 0.15 A2 0.033 0.037 0.85 0.95 B 0.008 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 0.026 BSC 0.65 BSC H 0.252 BSC 6.40 BSC L 0.020 0.028 θ 0° 8° 0.50 0.70 0° 8° Rev. 1 | Page 5 of 6 | www.onsemi.com ASM3P2107A Ordering Codes Part Number ASM3P2107AF-08SR Marking AEE Package Temperature 8-PIN SOIC, TAPE AND REEL, Pb Free 0°C to +70°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. are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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