ASM3P2108A Product Preview Peak EMI Reducing Solution Description The ASM3P2108A is a versatile spread spectrum frequency modulator designed specifically for input clock frequencies from 25 MHz to 45 MHz. The ASM3P2108A can generate an EMI reduced clock from crystal, ceramic resonator, or system clock. The ASM3P2108A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The ASM3P2108A 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 ASM3P2108A uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method. The ASM3P2108A 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 ASM3P2108A is targeted towards EMI management for high speed digital applications such as PC peripheral devices, consumer electronics and embedded controller systems. http://onsemi.com SOIC-8 S SUFFIX CASE 751BD TSSOP-8 T SUFFIX CASE 948AL PIN CONFIGURATION XIN/CLKIN 1 NC NC XOUT VDD GND CLOCKOUT NC (Top View) ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 6 of this data sheet. Features * FCC Approved Method of EMI Attenuation * Generates a 1X Low EMI Spread Spectrum Clock of the Input Frequency * Input Frequency Range: 25 MHz to 45 MHz * Internal Loop Filter Minimizes External Components and Board * * * * * * Space Frequency Deviation: - 1.3% (Typ) @ 32 MHz Low Cycle-to-Cycle Jitter 5.0 V 5% Operating Voltage Range TTL or CMOS Compatible Outputs Available in 8-pin TSSOP and SOIC Packages These are Pb-Free Devices This document contains information on a product under development. ON Semiconductor reserves the right to change or discontinue this product without notice. (c) Semiconductor Components Industries, LLC, 2011 August, 2011 - Rev. P2 1 Publication Order Number: ASM3P2108A/D ASM3P2108A VDD PLL Modulation XIN Frequency Divider Crystal Oscillator XOUT Feedback Divider Loop Filter Phase Detector VCO Output Divider CLOCKOUT GND Figure 1. Block Diagram Table 1. 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 (5 V). 7 NC - No connect. 8 NC - No connect. Table 2. 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 C TA Operating temperature Ts Max. Soldering Temperature (10 sec) 260 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 2 ASM3P2108A Table 3. 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 - mA IIH Input high current - 66 - mA IXOL XOUT output low current (@ 0.4, VDD = 5 V) - 3 - mA IXOH XOUT output high current (@ 2.5 V, VDD = 5 V) - 3 - mA VOL Output low voltage (VDD = 5 V, IOL = 20 mA) - - 0.4 V VOH Output high voltage (VDD = 5 V, IOH = 20 mA) 2.5 - - V ICC Dynamic supply current normal mode (5 V, 18 MHz and 15 pF loading) - 40 - mA IDD Static supply current standby mode - 40 - mA VDD Operating voltage 4.75 5.0 5.25 V tON Power up time (first locked clock cycle after power up) - 0.18 - mS Clock out impedance - 50 - W Min Typ Max Unit Input frequency 25 - 45 MHz Output frequency 25 - 45 MHz Input Frequency = 25 MHz - -1.98 - % Input Frequency = 45 MHz - -0.60 - ZOUT Table 4. AC ELECTRICAL CHARACTERISTICS Symbol fIN MODOUT fd Parameter Frequency Deviation tLH (Note 1) Output rise time (measured at 0.8 V to 2.0 V) - 440 - pS tHL (Note 1) Output fall time (measured at 2.0 V to 0.8 V) - 300 - pS tJC Jitter (cycle to cycle) - - 360 pS tD Output duty cycle 45 50 55 % 1. VDD = +5 V, Input Frequency = 32 MHz, tLH and tHL are measured into a capacitive load of 15 pF http://onsemi.com 3 ASM3P2108A 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 0 0.60 1.05 0.75 8 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 4 ASM3P2108A 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 0 8 TOP VIEW D h A1 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 5 ASM3P2108A Table 5. ORDERING INFORMATION Part Number Marking Package Type Temperature ASM3P2108AF-08-SR 3P2108AF 8-PIN SOIC, TAPE AND REEL, Pb Free Commercial ASM3P2108AF-08-ST 3P2108AF 8-PIN SOIC, TUBE, Pb Free Commercial ASM3P2108AF-08-TR 3P2108AF 8-PIN TSSOP, TAPE AND REEL, Pb Free Commercial ASM3P2108AF-08-TT 3P2108AF 8-PIN TSSOP, TUBE, Pb Free Commercial ASM3P2108AG-08-SR 3P2108AG 8-PIN SOIC, TAPE AND REEL, Green Commercial ASM3P2108AG-08-ST 3P2108AG 8-PIN SOIC, TUBE, Green Commercial ASM3P2108AG-08-TR 3P2108AG 8-PIN TSSOP, TAPE AND REEL, Green Commercial ASM3P2108AG-08-TT 3P2108AG 8-PIN TSSOP, TUBE, 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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