P2040C LCD Panel EMI Reduction IC Description The P2040C is a selectable spread spectrum frequency modulator designed specifically for digital flat panel applications. The P2040C reduces electromagnetic interference (EMI) at the clock source which provides system wide reduction of EMI of all clock dependent signals. The P2040C allows significant system cost savings by reducing the number of circuit board layers and shielding that are traditionally required to pass EMI regulations. The P2040C uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all-digital method. The P2040C 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 a 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 P2040C is targeted towards digital flat panel applications for Notebook PCs, Palm-size PCs, Office Automation Equipments, and LCD Monitors. * FCC Approved Method of EMI Attenuation * Provides up to 15 dB of EMI Suppression * Generates a Low EMI Spread Spectrum Clock of the Input * * * * * * * * * * Frequency 50 MHz to 173 MHz Input Frequency Range Optimized for 54 MHz, 65 MHz, 81 MHz, 140 MHz, and 162 MHz Pixel Clock Frequencies Internal Loop Filter Minimizes External Components and Board Space 8 Selectable Spread Ranges, up to 2.2% SSON# Control Pin for Spread Spectrum Enable and Disable Options 2 Selectable Modulation Rates Low Cycle-to-Cycle Jitter 3.3 V Operating Voltage Ultra Low Power CMOS Design Supports Most Mobile Graphic Accelerator and LCD Timing Controller Specifications Available in 8-pin SOIC and TSSOP Packages These are Pb-Free Devices (c) Semiconductor Components Industries, LLC, 2011 August, 2011 - Rev. 3 SOIC-8 S SUFFIX CASE 751BD TSSOP-8 T SUFFIX CASE 948AL PIN CONFIGURATION CLKIN MRA SR1 1 VDD P2040C 1 SR0 ModOUT SSON# VSS Features * * http://onsemi.com (Top View) ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 7 of this data sheet. Publication Order Number: P2040C/D P2040C VDD SR0 SR1 MRA SSON# PLL Modulation CLKIN Frequency Divider Loop Filter Phase Detector Feedback Divider Output Divider VCO ModOUT VSS Figure 1. Block Diagram Table 1. ABSOLUTE MAXIMUM RATINGS Symbol 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 +125 C Ts Max. Soldering Temperature (10 sec) 260 C qJA Thermal Resistance from Junction to Ambient (No Air Flow) 156.5 C/W VDD, VIN TSTG TJ For SOIC Package For TSSOP Package Junction Temperature TDV Static Discharge Voltage (As per JEDEC STD22- A114-B) 124 150 C 2 KV 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 CLKIN I External reference frequency input. Connect to externally generated reference signal. 2 MRA I Digital logic input used to select modulation rate. This pin has an internal pull-up resistor. 3 SR1 I Digital logic input used to select Spreading Range. This pin has an internal pull-up resistor. 4 VSS P Ground to entire chip. Connect to system ground. 5 SSON# I Digital logic input used to enable Spread Spectrum function (Active LOW). Spread Spectrum function enabled when LOW, disabled when HIGH. 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. This pin has an internal pull-up resistor. 8 VDD P Power supply for the entire chip. http://onsemi.com 2 P2040C Table 3. MODULATION SELECTION (Commercial) Spreading Range MRA SR1 SR0 54 MHz 65 MHz 81 MHz 140 MHz 162 MHz Modulation Rate 0 0 0 1.4% 1.2% 1.0% 0.6% 0.4% (Fin/80) * 62.49 KHz 0 0 1 2.0% 1.9% 1.6% 1.0% 0.8% (Fin/80) * 62.49 KHz 0 1 0 1.1% 0.9% 0.5% 0.3% 0.3% (Fin/80) * 62.49 KHz 0 1 1 1.8% 1.5% 1.0% 0.54% 0.4% (Fin/80) * 62.49 KHz 1 0 0 1.3% 1.3% 1.3% 1.25% 1.1% (Fin/80) * 20.83 KHz 1 0 1 2.2% 2.1% 2.1% 2.0% 1.8% (Fin/80) * 20.83 KHz 1 1 0 1.4% 1.3% 1.4% 1.2% 0.9% (Fin/80) * 20.83 KHz 1 1 1 2.1% 2.1% 2.1% 1.9% 1.4% (Fin/80) * 20.83 KHz Spread Spectrum Selection Example: 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 CLKIN, Pin 1). P2040C is designed for high resolution flat panel applications and is able to support panel frequencies from 50 MHz to 173 MHz. For a 65 MHz pixel clock frequency, a spreading selection of MRA = 0, SR1 = 1 and SR0 = 1 provides a percentage deviation of 1.50% (see Table 3). This result in frequency on ModOUT being swept from 64.03 MHz to 65.98 MHz at a modulation rate of 50.77 KHz (see Table 3). This particular example (see figure below) given here is a common EMI reduction method for notebook LCD panel and has already been implemented by most of the leading OEM and mobile graphic accelerator manufacturers. +3.3 V 65 MHz from graphics accelerator. 1 CLKIN VDD 8 2 MRA SR0 7 3 SR1 ModOUT 6 4 VSS SSON# 5 P2040C 0.1 mF Modulated 65 MHz signal with 1.5% deviation and modulation rate of 50.77 KHz. This signal is connected back to the spread spectrum input pin (SSIN) of the graphics accelerator. Digital control for the SS enable or disable. Figure 2. Application Schematic for Mobile LCD Graphics Controllers http://onsemi.com 3 P2040C Table 4. DC ELECTRICAL CHARACTERISTICS (Test condition: All parameters are measured at room temperature (+25C) unless otherwise stated.) Min Typ Max Unit VIL Input low voltage Parameter VSS-0.3 - 0.8 V VIH Input high voltage 2.0 - VDD+0.3 V IIL Input low current (pull-up resistor on inputs SR0, SR1 and MRA) - - -40 mA IIH Input high current (pull-down resistor on input SSON#) - - 40 mA VOL Output low voltage (VDD = 3.3 V, IOL = 20 mA) - - 0.4 V VOH Output high voltage (VDD = 3.3 V, IOL = 20 mA) 2.5 - - V IDD Static supply current standby mode - 0.7 - mA ICC Dynamic supply current (3.3 V and 10 pF loading) 9 16 22 mA 3.0 3.3 3.6 V Power-up time (first locked cycle after power up) - 0.18 - mS Clock output impedance - 50 - W Min Typ Max Unit Symbol VDD tON ZOUT Operating Voltage Table 5. AC ELECTRICAL CHARACTERISTICS Symbol fIN Parameter Input frequency 50 173 MHz tLH (Note 1) Output rise time (measured at 0.8 V to 2.0 V) 0.3 0.7 1.0 nS tHL (Note 1) Output fall time (measured at 2.0 V to 0.8 V) 0.3 0.7 1.0 nS 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 P2040C 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 5 P2040C 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 6 P2040C Table 6. ORDERING INFORMATION Part Number Marking Package Type Temperature P2040CF-08ST P2040CF 8-Pin SOIC, TUBE, Pb Free Commercial P2040CF-08SR P2040CF 8-Pin SOIC, TAPE & REEL, Pb Free Commercial P2040CF-08TT P2040CF 8-Pin TSSOP, TUBE, Pb Free Commercial P2040CF-08TR P2040CF 8-Pin TSSOP, TAPE & REEL, Pb Free Commercial I2040CF-08ST I2040CF 8-Pin SOIC, TUBE, Pb Free Industrial I2040CF-08SR I2040CF 8-Pin SOIC, TAPE & REEL, Pb Free Industrial I2040CF-08TT I2040CF 8-Pin TSSOP, TUBE, Pb Free Industrial I2040CF-08TR I2040CF 8-Pin TSSOP, TAPE & REEL, Pb Free Industrial X2040CF-08ST X2040CF 8-Pin SOIC, TUBE, Pb Free Automotive X2040CF-08SR X2040CF 8-Pin SOIC, TAPE & REEL, Pb Free Automotive X2040CF-08TT X2040CF 8-Pin TSSOP, TUBE, Pb Free Automotive X2040CF-08TR X2040CF 8-Pin TSSOP, TAPE & REEL, Pb Free Automotive P2040CG-08ST P2040CG 8-Pin SOIC, TUBE, Green Commercial P2040CG-08SR P2040CG 8-Pin SOIC, TAPE & REEL, Green Commercial P2040CG-08TT P2040CG 8-Pin TSSOP, TUBE, Green Commercial P2040CG-08TR P2040CG 8-Pin TSSOP, TAPE & REEL, Green Commercial I2040CG-08ST I2040CG 8-Pin SOIC, TUBE, Green Industrial I2040CG-08SR I2040CG 8-Pin SOIC, TAPE & REEL, Green Industrial I2040CG-08TT I2040CG 8-Pin TSSOP, TUBE, Green Industrial I2040CG-08TR I2040CG 8-Pin TSSOP, TAPE & REEL, Green Industrial X2040CG-08ST X2040CG 8-Pin SOIC, TUBE, Green Automotive X2040CG-08SR X2040CG 8-Pin SOIC, TAPE & REEL, Green Automotive X2040CG-08TT X2040CG 8-Pin TSSOP, TUBE, Green Automotive X2040CG-08TR X2040CG 8-Pin TSSOP, TAPE & REEL, Green Automotive ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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