ASM3P2669A Peak EMI Reducing Solution Features • Generates a 1X low EMI spread spectrum clock of the input frequency. • Integrated loop filter components. system cost savings by reducing the number of circuit board layers, ferrite beads and shielding that are traditionally required to pass EMI regulations. The ASM3P2669A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method. • Operates with a 3.3V / 2.5V supply. • Operating current less than 4mA. • CMOS design. • Input frequency range: 6MHz to 12MHz for 2.5V 6MHz to 13MHz for 3.3V • Frequency deviation: ±1% @ 10MHz • 6L-TSOP (6L-TSOT-23) Product Description The ASM3P2669A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2669A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock dependent signals. The ASM3P2669A allows significant The ASM3P2669A 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.’ Application The ASM3P2669A is targeted towards all portable devices like MP3 players and digital still cameras. Block Diagram VDD PD PLL Modulation CLKIN Frequency Divider Feedback Divider Phase Detector Loop Filter VCO Output Divider ModOUT VSS ©2010 SCILLC. All rights reserved. OCTOBER 2010 – Rev. 2.1 Publication Order Number: ASM3P2669/D ASM3P2669A Pin Configuration (6L- TSOP Package) PD 1 NC 2 ASM3P2669A CLKIN 3 6 VSS 5 ModOUT 4 VDD Pin Description Pin# Pin Name 1 Type PD Description I Power-down control pin. Pull low to enable power-down mode. Connect to VDD if not used. 2 NC - No connect. 3 CLKIN I External reference clock input. 4 VDD P Power supply for the entire chip. 5 ModOUT O Spread spectrum clock output. 6 VSS P Ground connection. Specifications VDD (V) Frequency Range (MHz) 2.5 6-12 3.3 6-13 Absolute Maximum Ratings Symbol VDD, VIN TSTG Modulation Rate FIN/256 Parameter Rating Unit Voltage on any pin with respect to Ground -0.5 to +4.6 V Storage temperature -65 to +125 °C 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 Supply Voltage Min Max Unit 2.375 3.6 V -40 +85 °C Load Capacitance 15 pF Input Capacitance 7 pF TA Operating Temperature (Ambient Temperature) CL CIN Rev. 2 | Page 2 of 7 | www.onsemi.com ASM3P2669A DC Electrical Characteristics for 2.5V Supply Symbol Parameter Min Typ Max Unit V VIL Input low voltage VSS-0.3 0.8 VIH Input high voltage 2.0 VDD+0.3 V IIL Input low current -35 µA IIH Input high current 35 µA VOL Output low voltage (VDD = 2.5 V, IOL = 8mA) 0.6 V VOH Output high voltage (VDD = 2.5 V, IOH = 8mA) IDD Static supply current ICC Dynamic supply current (Unloaded Output) VDD tON ZOUT 1.8 V 1 Operating voltage 2.375 10 uA 2 2.5 mA 2.5 2.625 V 5 mS 2 Power-up time (first locked cycle after power-up) Output impedance 40 Ω Notes: 1. XIN / CLKIN pin and PD pin are pulled low. 2. VDD and XIN / CLKIN input are stable, PD pin is made high from low. AC Electrical Characteristics for 2.5V Supply Symbol CLKIN ModOUT fd Parameter Typ Max Unit Input frequency 6 12 MHz Output frequency 6 12 MHz Frequency Deviation 1 tLH Min CLKIN = 6MHz ±1.25 CLKIN = 10MHz ±1 CLKIN = 12MHz ±0.9 % Output Rise time (measured from 0.7V to 1.7V) 0.9 1.7 2.5 nS Output Fall time (measured from 1.7V to 0.7V) 0.6 1 1.5 nS tD Output Duty Cycle 45 50 55 % tJC Cycle-to-Cycle Jitter ±250 ±400 pS tHL 1 Note: 1. tLH and tHL are measured into a capacitive load of 15pF. Rev. 2 | Page 3 of 7 | www.onsemi.com ASM3P2669A DC Electrical Characteristics for 3.3V Supply Symbol Parameter VIL Min Typ Max Unit V Input low voltage VSS-0.3 0.8 VIH Input high voltage 2.0 VDD+0.3 V IIL Input low current -35 µA IIH Input high current 35 µA VOL Output low voltage (VDD = 3.3 V, IOL = 8mA) 0.4 V VOH Output high voltage (VDD = 3.3 V, IOH = 8mA) - V IDD Static supply current ICC Dynamic supply current (Unloaded Output) VDD tON ZOUT 2.5 1 Operating voltage 2.7 10 uA 2.5 3 mA 3.3 3.6 V 5 mS 2 Power-up time (first locked cycle after power-up) Output impedance 35 Ω Notes: 1. XIN / CLKIN pin and PD pin are pulled low. 2. VDD and XIN / CLKIN input are stable, PD pin is made high from low. AC Electrical Characteristics for 3.3V Supply Symbol CLKIN ModOUT fd Parameter Typ Max Unit Input frequency 6 13 MHz Output frequency 6 13 MHz Frequency Deviation 1 tLH Min CLKIN = 6MHz ±1.25 CLKIN = 10MHz ±1 CLKIN = 13MHz ±0.9 % Output Rise time (measured from 0.8V to 2.0V) 0.7 1.3 1.7 nS Output Fall time (measured at 2.0V to 0.8V) 0.6 0.9 1.3 nS tD Output Duty Cycle 45 50 55 % tJC Cycle - Cycle Jitter ±300 ±450 pS tHL 1 Note: 1. tLH and tHL are measured into a capacitive load of 15pF. Note: All parameters are at an Extended Industrial temperature range unless otherwise stated. Modulation Profile Rev. 2 | Page 4 of 7 | www.onsemi.com ASM3P2669A Typical Application Schematic VDD C1 0.1µF C2 2.2µF VDD ASM3P2669A Rs ModOUT VSS Rev. 2 | Page 5 of 7 | www.onsemi.com ModOUT Clock ASM3P2669A Package Information 6L-TSOP Package Dimensions Symbol Inches Min A Max Millimeters Min Max 0.04 1.00 A1 0.00 0.004 0.00 0.10 A2 0.033 0.036 0.84 0.90 b 0.012 0.02 0.30 0.50 H 0.005 BSC 0.127 BSC D 0.114 BSC 2.90 BSC B 0.06 BSC 1.60 BSC e 0.0374 BSC 0.950 BSC C 0.11 BSC 2.80 BSC L 0.0118 0.02 0.30 0.50 θ 0° 4° 0° 4° Rev. 2 | Page 6 of 7 | www.onsemi.com ASM3P2669A Ordering Information Part Number Marking ASM3P2669AF-06OR H4L ASM3I2669AF-06OR H5L Package Type Temperature 6L-TSOP (6L-TSOT-23), TAPE & REEL, Pb Free 6L-TSOP (6L-TSOT-23), TAPE & REEL, Pb Free 0°C to +70°C -40°C to +85°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. 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