ASM3P2879A Low Power Peak Reducing EMI Solution Description The ASM3P2879A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2879A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock dependent signals. The ASM3P2879A allows significant system cost savings by reducing the number of circuit board layers, ferrite beads and shielding that are traditionally required to pass EMI regulations. The ASM3P2879A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method. The ASM3P2879A 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 ASM3P2879A is targeted towards all portable devices with very low power requirements like MP3 players, Notebooks and digital still cameras. http://onsemi.com TSOT−6 O SUFFIX CASE 419AF • • • • SOIC−8 S SUFFIX CASE 751BD PIN CONFIGURATIONS 1 REFOUT VSS ModOUT XOUT VDD XIN / CLKIN 6−Pin TSOT−23 Package (Top View) Features • • • • • • TSSOP−8 T SUFFIX CASE 948AL 1 Generates an EMI Optimized Clock Signal at the Output Integrated Loop Filter Components Operates with a 3.3 V / 2.5 V Supply Operating Current less than 4 mA Low Power CMOS Design Input Frequency Range: 13 MHz to 30 MHz for 2.5 V 13 MHz to 30 MHz for 3.3 V Generates a 1X Low EMI Spread Spectrum Clock of the Input Frequency Frequency Deviation: ±1% @ 24 MHz Available in 6−pin TSOT−23, 8−pin SOIC and 8−pin TSSOP Packages These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant VDD XIN / CLKIN NC XOUT ModOUT REFOUT VSS NC 8−Pin SOIC and TSSOP Packages (Top View) KEY SPECIFICATIONS Specification Description Supply Voltages VDD = 2.5 V / 3.3 V Cycle−to−Cycle Jitter 200 pS (Max) Output Duty Cycle 45/55% Modulation Rate Equation FIN/640 Frequency Deviation ±1% @ 24 MHz ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 10 of this data sheet. © Semiconductor Components Industries, LLC, 2011 August, 2011 − Rev. 3 1 Publication Order Number: ASM3P2879A/D ASM3P2879A VDD PLL Modulation XIN XOUT Frequency Divider Crystal Oscillator Phase Detector Feedback Divider Loop Filter VCO Output Divider ModOUT REFOUT VSS Figure 1. Block Diagram Table 1. PIN DESCRIPTION (6−Pin TSOT−23 Package) Pin# Pin Name Type Description 1 REFOUT O Buffered output of the input frequency. 2 XOUT O Crystal connection. If using an external reference, this pin must be left unconnected. 3 XIN / CLKIN I Crystal connection or external reference frequency input. This pin has dual functions. It can be connected either to an external crystal or an external reference clock. 4 VDD P Power supply for the entire chip (3.3 V). 5 ModOUT O Spread spectrum clock output. 6 VSS P Ground connection. Table 2. PIN DESCRIPTION (8−Pin SOIC and TSSOP Packages) Pin# Pin Name Type 1 XIN / CLKIN I Crystal connection or external reference frequency input. This pin has dual functions. It can be connected either to an external crystal or an external reference clock. Description 2 XOUT O Crystal connection. If using an external reference, this pin must be left unconnected. 3 REFOUT O Buffered output of the input frequency. 4 NC − No connect. 5 VSS P Ground connection. 6 ModOUT O Spread spectrum clock output. 7 NC − No connect. 8 VDD P Power supply for the entire chip. http://onsemi.com 2 ASM3P2879A Figure 2. Modulation Profile Table 3. SPECIFICATIONS Description Frequency Range Specification 13 MHz < CLKIN < 30 MHz For 2.5 V Supply For 3.3 V Supply Modulation Equation FIN/640 Frequency Deviation ±1% @ 24 MHz Table 4. ABSOLUTE MAXIMUM RATINGS Symbol VDD, VIN TSTG Parameter Rating Unit Voltage on any pin with respect to Ground −0.5 to +4.6 V Storage temperature −65 to +125 °C TA Operating temperature −40 to +85 °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) Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. http://onsemi.com 3 ASM3P2879A Table 5. DC ELECTRICAL CHARACTERISTICS FOR 2.5 V SUPPLY (Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated.) Parameter Symbol Min Typ Max Unit VIL Input low voltage VSS−0.3 − 0.8 V VIH Input high voltage 2.0 − VDD+0.3 V IIL Input low current − − −35 mA IIH Input high current − − 35 mA IXOL XOUT output low current (@ 0.5 V, VDD = 2.5 V) − 3 − mA IXOH XOUT output high current (@ 1.8 V, VDD = 2.5 V) − 3 − mA VOL Output low voltage (VDD = 2.5 V, IOL = 8 mA) − − 0.6 V VOH Output high voltage (VDD = 2.5 V, IOH = 8 mA) 1.8 − − V IDD Static supply current (Note 1) − 1.2 − mA ICC Dynamic supply current (2.5 V, 24 MHz and with no load) − 3.5 − mA 2.375 2.5 2.625 V Power−up time (first locked cycle after power−up) − − 5 mS Output impedance − 50 − W Min Typ Max Unit Input frequency 13 − 30 MHz Output frequency 13 − 30 MHz Input Frequency = 13 MHz − ±1.75 − % Input Frequency = 30 MHz − ±0.80 − VDD tON ZOUT Operating Voltage 1. XIN / CLKIN pin is pulled low. Table 6. AC ELECTRICAL CHARACTERISTICS FOR 2.5 V SUPPLY Symbol CLKIN ModOUT fd Parameter Frequency Deviation tLH (Note 2) Output rise time (measured from 0.7 V to 1.7 V) 0.8 1.7 1.9 nS tHL (Note 2) Output fall time (measured from 1.7 V to 0.7 V) 0.5 0.9 1.2 nS tJC Jitter (Cycle−to−Cycle) − − 200 pS tD Output duty cycle 45 50 55 % 2. tLH and tHL are measured into a capacitive load of 15 pF. http://onsemi.com 4 ASM3P2879A Table 7. DC ELECTRICAL CHARACTERISTICS FOR 3.3 V SUPPLY (Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated.) Parameter Symbol Min Typ Max Unit VIL Input low voltage VSS−0.3 − 0.8 V VIH Input high voltage 2.0 − VDD+0.3 V IIL Input low current − − −35 mA IIH Input high current − − 35 mA IXOL XOUT output low current (@ 0.4 V, VDD = 3.3 V) − 3 − mA IXOH XOUT output high current (@ 2.5 V, VDD = 3.3 V) − 3 − mA VOL Output low voltage (VDD = 3.3 V, IOL = 8 mA) − − 0.4 V VOH Output high voltage (VDD = 3.3 V, IOH = 8 mA) 2.5 − − V IDD Static supply current (Note 3) − 1.2 − mA ICC Dynamic supply current (3.3 V, 24 MHz and with no load) − 4.5 − mA 2.7 3.3 3.6 V Power−up time (first locked cycle after power−up) − − 5 mS Output impedance − 45 − W Min Typ Max Unit Input frequency 13 − 30 MHz Output frequency 13 − 30 MHz Input Frequency = 13 MHz − ±1.75 − % Input Frequency = 30 MHz − ±0.80 − VDD tON ZOUT Operating Voltage 3. XIN / CLKIN pin is pulled low. Table 8. AC ELECTRICAL CHARACTERISTICS FOR 3.3 V SUPPLY Symbol CLKIN ModOUT fd Parameter Frequency Deviation tLH (Note 4) Output rise time (measured from 0.8 V to 2.0 V) 0.6 1.6 1.8 nS tHL (Note 4) Output fall time (measured at 2.0 V to 0.8 V) 0.4 1.0 1.2 nS tJC Jitter (Cycle−to−Cycle) − − 200 pS tD Output duty cycle 45 50 55 % 4. tLH and tHL are measured into a capacitive load of 15 pF. http://onsemi.com 5 ASM3P2879A R1 = 510 W Crystal C1 = 27 pF C2 = 27 pF Figure 3. Typical Crystal Oscillator Circuit Table 9. TYPICAL CRYSTAL SPECIFICATIONS Fundamental AT Cut Parallel Resonant Crystal Nominal frequency 14.31818 MHz Frequency tolerance ±50 ppm or better at 25°C Operating temperature range −25°C to +85°C Storage temperature −40°C to +85°C Load capacitance 18 pF Shunt capacitance 7 pF maximum ESR 25 W http://onsemi.com 6 ASM3P2879A PACKAGE DIMENSIONS TSOT−23, 6 LEAD CASE 419AF−01 ISSUE O SYMBOL D MIN NOM A e E1 MAX 1.00 A1 0.01 0.05 0.10 A2 0.80 0.87 0.90 b 0.30 c 0.12 E 0.45 0.15 D 2.90 BSC E 2.80 BSC E1 1.60 BSC e 0.95 TYP L 0.30 L1 0.40 0.20 0.50 0.60 REF L2 0.25 BSC 0º θ 8º TOP VIEW A2 A b q L A1 c L1 SIDE VIEW END VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-193. http://onsemi.com 7 L2 ASM3P2879A PACKAGE DIMENSIONS SOIC 8, 150 mils CASE 751BD−01 ISSUE O E1 E SYMBOL MIN A 1.35 1.75 A1 0.10 0.25 b 0.33 0.51 c 0.19 0.25 D 4.80 5.00 E 5.80 6.20 E1 3.80 4.00 MAX 1.27 BSC e PIN # 1 IDENTIFICATION NOM h 0.25 0.50 L 0.40 1.27 θ 0º 8º TOP VIEW D h A1 θ A c e b L END VIEW SIDE VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MS-012. http://onsemi.com 8 ASM3P2879A PACKAGE DIMENSIONS TSSOP8, 4.4x3 CASE 948AL−01 ISSUE O b SYMBOL MIN NOM A E1 E MAX 1.20 A1 0.05 A2 0.80 b 0.19 0.30 c 0.09 0.20 D 2.90 3.00 3.10 E 6.30 6.40 6.50 E1 4.30 4.40 4.50 0.15 0.90 e 0.65 BSC L 1.00 REF L1 0.50 θ 0º 0.60 1.05 0.75 8º e TOP VIEW D A2 c q1 A A1 L1 SIDE VIEW L END VIEW Notes: (1) All dimensions are in millimeters. Angles in degrees. (2) Complies with JEDEC MO-153. http://onsemi.com 9 ASM3P2879A Table 10. ORDERING INFORMATION Part Number Marking ASM3P2879AF−06OR D4LL ASM3P2879AF−08TT Package Type Temperature 6−Pin TSOT−23, TAPE & REEL, Pb Free Commercial 3P2879AF 8−Pin TSSOP, TUBE, Pb Free Commercial ASM3P2879AF−08TR 3P2879AF 8−Pin TSSOP, TAPE & REEL, Pb Free Commercial ASM3P2879AF−08ST 3P2879AF 8−Pin SOIC, TUBE, Pb Free Commercial ASM3P2879AF−08SR 3P2879AF 8−Pin SOIC, TAPE & REEL, Pb Free Commercial ASM3P2879AG−06OR D3LL 6−Pin TSOT−23, TAPE & REEL, Green Commercial ASM3P2879AG−08TT 3P2879AG 8−Pin TSSOP, TUBE, Green Commercial ASM3P2879AG−08TR 3P2879AG 8−Pin TSSOP, TAPE & REEL, Green Commercial ASM3P2879AG−08ST 3P2879AG 8−Pin SOIC, TUBE, Green Commercial ASM3P2879AG−08SR 3P2879AG 8−Pin SOIC, TAPE & REEL, Green Commercial ASM3I2879AF−06OR D5LL ASM3I2879AF−08TT 6−Pin TSOT−23, TAPE & REEL, Pb Free Industrial 3I2879AF 8−Pin TSSOP, TUBE, Pb Free Industrial ASM3I2879AF−08TR 3I2879AF 8−Pin TSSOP, TAPE & REEL, Pb Free Industrial ASM3I2879AF−08ST 3I2879AF 8−Pin SOIC, TUBE, Pb Free Industrial ASM3I2879AF−08SR 3I2879AF 8−Pin SOIC, TAPE & REEL, Pb Free Industrial ASM3I2879AG−06OR D6LL 6−Pin TSOT−23, TAPE & REEL, Green Industrial ASM3I2879AG−08TT 3I2879AG 8−Pin TSSOP, TUBE, Green Industrial ASM3I2879AG−08TR 3I2879AG 8−Pin TSSOP, TAPE & REEL, Green Industrial ASM3I2879AG−08ST 3I2879AG 8−Pin SOIC, TUBE, Green Industrial ASM3I2879AG−08SR 3I2879AG 8−Pin SOIC, TAPE & REEL, Green Industrial ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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