P2041A Versatile EMI Reduction IC Description The P2041A is a selectable spread spectrum frequency modulator designed specifically for PC peripheral and embedded controller markets. The P2041A reduces electromagnetic interference (EMI) at the clock source which provides system wide reduction of EMI of all clock dependent signals. The P2041A allows significant system cost savings by reducing the number of circuit board layers and shielding that are traditionally required to pass EMI regulations. The P2041A uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all−digital method. The P2041A 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 P2041A is targeted towards the embedded controller market and PC peripheral markets including scanners, MFP’s, printers, PDA, IA, and GPS devices. http://onsemi.com SOIC−8 S SUFFIX CASE 751BD TSSOP−8 T SUFFIX CASE 948AL PIN CONFIGURATION XIN / CLK XOUT SR1 1 VDD P2041A SR0 ModOUT SSON VSS (Top View) Features • FCC Approved Method of EMI Attenuation • Provides up to 20 dB of EMI Suppression • Generates a Low EMI Spread Spectrum Clock of the Input Frequency ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 7 of this data sheet. • Optimized for 25 MHz to 60 MHz Input Frequency Range • Internal Loop Filter Minimizes External Components and Board • • • • • • • Space 4 Selectable Spread Ranges SSON Control Pin for Spread Spectrum Enable and Disable Options Low Cycle−to−Cycle Jitter 3.3 V or 5.0 V Operating Voltage Low Power CMOS Design Available in 8−pin SOIC and TSSOP Packages These are Pb−Free Devices © Semiconductor Components Industries, LLC, 2011 August, 2011 − Rev. 2 1 Publication Order Number: P2041A/D P2041A SR0 VDD PLL Modulation XIN XOUT SR1 SSON Frequency Divider Crystal Oscillator Phase Detector Feedback Divider Loop Filter Output Divider VCO ModOUT VSS Figure 1. Block Diagram Table 1. ABSOLUTE MAXIMUM RATINGS Symbol Rating Unit Voltage on any pin with respect to Ground −0.5 to +7.0 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 VDD, VIN TSTG TDV Parameter 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. Table 2. PIN DESCRIPTION Pin# Pin Name Type Description 1 XIN / CLK I Connect to crystal or externally generated clock signal. 2 XOUT I Connect to crystal. No connect if externally generated clock signal is used. 3 SR1 I Digital logic input used to select Spreading Range (see Table 3). This pin has an internal pull−up resistor. 4 VSS P Ground Connection. Connect to system ground. 5 SSON I Digital logic input used to enable Spread Spectrum function (Active Low). Spread Spectrum function enable when low. This pin has an internal pull−low resistor. 6 ModOUT O Spread Spectrum Clock Output. 7 SR0 I Digital logic input used to select Spreading Range (see Table 3). This pin has an internal pull−up resistor. 8 VDD P Connect to +3.3 V or +5.0 V. http://onsemi.com 2 P2041A Table 3. SPREAD RANGE SELECTION SR1 SR0 Spreading Range Modulation rate 0 0 ±1.50% (Fin/40)*34.72 KHz 0 1 ±2.50% (Fin/40)*34.72 KHz 1 0 ±0.50% (Fin/40)*34.72 KHz 1 1 ±1.00% (Fin/40)*34.72 KHz Spread Spectrum Selection Example of a typical printer or scanner application that operates on a clock frequency of 40 MHz: Table 3 illustrates the possible spread spectrum options. The optimal setting should minimize system EMI to the fullest without affecting system performance. The spreading is described as a percentage deviation of the center frequency (Note: The center frequency is the frequency of the external reference input on XIN / CLK, Pin 1). A spreading selection of SR1=1 and SR0=1 provides a percentage deviation of ±1.00%* (see Table 3) of Center Frequency. This results in the frequency on ModOUT being swept from 40.40 MHz to 39.60 MHz at a modulation rate of (40/40)*34.72 = 34.72 KHz (see Table 3). This particular example (see Figure below) given here is a common EMI reduction method for scanners and has already been implemented by most of the leading manufacturers. NOTE: Spreading range selection varies from different system manufacturers and their designs. The spreading range of P2041A can be set to ±2.5% when working with certain scanner model. VDD 40 MHz 1 XIN / CLK VDD 8 2 XOUT 3 SR1 SR0 7 0.1 mF ModOUT 6 SSON 5 4 VSS P2041A Modulated 40 MHz signal with ±1.00% Deviation and modulation rate of 34.72 KHz. This signal is connected back to the clock crystal Input pin of the system ASIC. Note: The above schematic indicates The exact setting of this example: Default setting (no connection on pin 3, 7 and 5). Figure 2. P2041A Application Schematic for Flat−Bed Scanner http://onsemi.com 3 P2041A Table 4. DC ELECTRICAL CHARACTERISTICS (Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated.) Parameter Symbol VIL Input low Voltage Min Typ Max Unit VSS−0.3 − 0.8 V − − 1.5 (For 3.3 V Supply Voltage) 2.0 − VDD+0.3 (For 5 V Supply Voltage) 3.5 − − (For 3.3 V Supply Voltage) (For 5 V Supply Voltage) VIH Input low Voltage IIL Input Low Current (pull−up resistor on inputs SR0, SR1) (For 3.3 V Supply Voltage) − − −35 (For 5 V Supply Voltage) − − −100 IIH Input High Current (pull−down resistor on input SSON) (For 3.3 V Supply Voltage) − − 35 (For 5 V Supply Voltage) − − 100 V mA mA IXOL XOUT Output Low Current (VXOL @ 0.4 V, VDD = 3.3 V) − 3 − mA IXOH XOUT Output High Current (VXOH@ 2.5 V, VDD = 3.3 V) − 3 − mA VOL Output Low Voltage (VDD = 3.3 V, IOL = 20 mA) − − 0.4 V (VDD = 5 V, IOL = 20 mA) − − 0.5 (VDD = 3.3 V, IOH = 20 mA) 2.5 − − (VDD = 5 V, IOH = 20 mA) 4.5 − − − 1.0 − mA 3.3 V and 15 pF loading − − 22 mA 5 V and 15 pF loading − − 35 2.7 3.3 5.5 VOH Output High Voltage IDD Static Supply Current ICC Dynamic Supply Current VDD Operating Voltage V V Table 5. AC ELECTRICAL CHARACTERISTICS Symbol Min Typ Max Unit Input Frequency 25 40 60 MHz tLH (Note 1) Output rise time (Measured at 0.8 V to 2.0 V) 0.7 1.0 1.3 nS tHL (Note 1) Output fall time (Measured at 2.0 V to 0.8 V) 0.6 0.8 1.0 nS fIN Parameter tJC Jitter (Cycle−to−cycle) − 360 − pS tD Output duty cycle 45 50 55 % 1. tLH and tHL are measured into a capacitive load of 15 pF. http://onsemi.com 4 P2041A 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 5 P2041A 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 6 P2041A Table 6. ORDERING INFORMATION Part Number Marking Package Type Temperature P2041AF−08ST P2041AF 8−Pin SOIC, Tube, Pb Free Commercial P2041AF−08SR P2041AF 8−Pin SOIC, Tape and Reel, Pb Free Commercial P2041AF−08TT P2041AF 8−Pin TSSOP, Tube, Pb Free Commercial P2041AF−08TR P2041AF 8−Pin TSSOP, Tape and Reel, Pb Free Commercial P2041AG−08ST P2041AG 8−Pin SOIC, Tube, Green Commercial P2041AG−08SR P2041AG 8−Pin SOIC, Tape and Reel, Green Commercial P2041AG−08TT P2041AG 8−Pin TSSOP, Tube, Green Commercial P2041AG−08TR P2041AG 8−Pin TSSOP, Tape and Reel, Green Commercial I2041AF−08ST I2041AF 8−Pin SOIC, Tube, Pb Free Industrial I2041AF−08SR I2041AF 8−Pin SOIC, Tape and Reel, Pb Free Industrial I2041AF−08TT I2041AF 8−Pin TSSOP, Tube, Pb Free Industrial I2041AF−08TR I2041AF 8−Pin TSSOP, Tape and Reel, Pb Free Industrial I2041AG−08ST I2041AG 8−Pin SOIC, Tube, Green Industrial I2041AG−08SR I2041AG 8−Pin SOIC, Tape and Reel, Green Industrial I2041AG−08TT I2041AG 8−Pin TSSOP, Tube, Green Industrial I2041AG−08TR I2041AG 8−Pin TSSOP, Tape and Reel, Green Industrial ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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