ASM3P2863A Product Preview Low Power Peak EMI Reducing Solution Description The ASM3P2863A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2863A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock dependent signals. The ASM3P2863A 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 ASM3P2863A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method. The ASM3P2863A 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 ASM3P2863A is targeted towards all portable devices with very low power requirements like MP3 players, Notebooks and Digital still cameras. • • • TSOT−6 O SUFFIX CASE 419AF TSSOP−8 T SUFFIX CASE 948AL SOIC−8 S SUFFIX CASE 751BD PIN CONFIGURATIONS 1 REFOUT VSS ModOUT XOUT VDD XIN / CLKIN 6−Pin TSOT−23 Package (Top View) 1 VDD XIN / CLKIN Features • • • • • • • http://onsemi.com 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: 12 MHz Generates a 1X Low EMI Spread Spectrum Clock of the Input Frequency Frequency Deviation: ±0.4% (Typ) @ 12 MHz Input Frequency 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 This document contains information on a product under development. ON Semiconductor reserves the right to change or discontinue this product without notice. 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 (Typ) Output Duty Cycle 45/55% (worst case) Modulation Rate Equation FIN/256 Frequency Deviation ±0.4% (Typ) @ 12 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. P2 1 Publication Order Number: ASM3P2863A/D ASM3P2863A VDD XIN / CLKIN XOUT PLL Modulation 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. 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 ASM3P2863A Figure 2. Modulation Profile Table 3. SPECIFICATIONS Description Specification Input Frequency 12 MHz Modulation Equation FIN/256 Frequency Deviation ±0.4% (Typ) @ 12 MHz Table 4. ABSOLUTE MAXIMUM RATINGS Symbol VDD, VIN TSTG Parameter Rating Unit Voltage on any input 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) 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 ASM3P2863A 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) − 0.8 − mA ICC Dynamic supply current (2.5 V, 12 MHz and no load) − 3 − 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 − 12 − MHz Output frequency − 12 − MHz 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 − ±0.4 − % tLH (Note 2) Frequency Deviation Output rise time (measured from 0.7 V to 1.7 V) 0.5 1.5 1.7 nS tHL (Note 2) Output fall time (measured from 1.7 V to 0.7 V) 0.5 1.0 1.2 nS tJC Jitter (Cycle−to−Cycle) − 200 300 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 ASM3P2863A 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 − mA ICC Dynamic supply current (3.3 V, 12 MHz and no load) − 3.5 − mA 3.0 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 − 12 − MHz Output frequency − 12 − MHz 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 − ±0.4 − % tLH (Note 4) Frequency Deviation Output rise time (measured from 0.8 V to 2.0 V) 0.5 1.4 1.6 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) − 200 300 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 ASM3P2863A Table 9. CRYSTAL SPECIFICATIONS Fundamental AT Cut Parallel Resonant Crystal Nominal frequency 12 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 (CP) 18 pF Shunt capacitance 7 pF maximum ESR 25 W NOTE: CL is Load Capacitance and Rx is used to prevent oscillations at overtone frequency of the Fundamental frequency. R Crystal XIN Rx XOUT CL CL CL = 2*(CP – CS), Where CP = Load capacitance of crystal from crystal vendor datasheet. Where CS = Stray capacitance due to CIN, PCB, Trace, etc. Figure 3. Typical Crystal Interface Circuit http://onsemi.com 6 ASM3P2863A 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 ASM3P2863A 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 ASM3P2863A 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 ASM3P2863A Table 10. ORDERING INFORMATION Part Number Marking ASM3P2863AF−06OR V4LL ASM3P2863AF−08TT Package Type Temperature 6−Pin TSOT−23, TAPE & REEL, Pb Free Commercial 3P2863AF 8−Pin TSSOP, TUBE, Pb Free Commercial ASM3P2863AF−08TR 3P2863AF 8−Pin TSSOP, TAPE & REEL, Pb Free Commercial ASM3P2863AF−08ST 3P2863AF 8−Pin SOIC, TUBE, Pb Free Commercial ASM3P2863AF−08SR 3P2863AF 8−Pin SOIC, TAPE & REEL, Pb Free Commercial ASM3P2863AG−06OR V3LL 6−Pin TSOT−23, TAPE & REEL, Green Commercial ASM3P2863AG−08TT 3P2863AG 8−Pin TSSOP, TUBE, Green Commercial ASM3P2863AG−08TR 3P2863AG 8−Pin TSSOP, TAPE & REEL, Green Commercial ASM3P2863AG−08ST 3P2863AG 8−Pin SOIC, TUBE, Green Commercial ASM3P2863AG−08SR 3P2863AG 8−Pin SOIC, TAPE & REEL, Green Commercial ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. 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