P1708C Notebook LCD Panel EMI Reduction IC Features Product Description • FCC approved method of EMI attenuation. • Generates a low EMI spread spectrum clock of the input frequency. • Optimized for frequency range from 50 to 110MHz. • Internal loop filter minimizes external components and board space. • Four selectable spread ranges. • Low inherent cycle-to-cycle jitter. • 3.3V operating voltage range. The P1708C is a versatile spread spectrum frequency modulator designed specifically for input clock frequencies. The P1708C reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The P1708C 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 P1708C 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 result 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.’ • TTL or CMOS compatible inputs and outputs. • CMOS design. o 8.46mA @ 3.3V, 54MHz o 9.79mA @ 3.3V, 65MHz o 12.06mA @ 3.3V, 81MHz o 16.51mA @ 3.3V, 108MHz • Supports notebook VGA and other LCD timing controller applications. The P1708C uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method. • Pinout compatible to ICS MK1708 and Cypress CY25560. • SSON / SBM pin for Spread Spectrum On/Off and Standby Mode controls. Applications • Available in 8-pin SOIC and TSSOP. The P1708C is targeted towards notebook LCD displays, and other displays using an LVDS interface, PC peripheral devices, and embedded systems. SR0 SR1 SSON Block Diagram VDD PLL Modulation CLKIN Frequency Divider Feedback Divider Phase Detector Loop Filter VCO Output Divider ModOUT ©2010 SCILLC. All rights reserved. FEBRUARY 2010 – Rev. 2 VSS Publication Order Number: P1708/D P1708C Pin Configuration CLKIN 1 8 NC VDD 2 7 SR0 P1708C VSS 3 6 SR1 5 SSON/SBM ModOUT 4 Pin Description Pin# Pin Name Type Description 1 CLKIN I Connect to externally generated clock signal. To put the part into standby mode, disable the input clock signal to this pin and pull SSON / SBM (pin 5) low. Refer to Standby Mode Selection Table. 2 VDD P Connect to +3.3V. 3 VSS P Ground Connection. Connect to system ground. 4 ModOUT O Spread spectrum clock output. 5 SSON / SBM I Spread Spectrum On/Off and standby mode control. Refer to Standby Mode Selection Table. This pin has an internal pull-up resistor. 6 SR1 I Digital logic input used to select Spreading Range. Refer to Spread Spectrum Selection Table. This pin has an internal pull-up resistor. 7 SR0 I Digital logic input used to select Spreading Range. Refer to Spread Spectrum Selection Table. This pin has an internal pull-up resistor. 8 NC - No connect. Standby Mode Selection CLKIN SSON / SBM Spread Spectrum ModOUT PLL Mode Disabled 0 N/A Disabled Disabled Standby Disabled 1 N/A Disabled Free Running Free Running Enabled 0 Off Reference Disabled Buffer out Enabled 1 On Normal Normal Normal Rev. 2 | Page 2 of 7 | www.onsemi.com P1708C Spread Range Selection SR1 SR0 Spreading Range Modulation Rate 0 0 ±1.00% (FIN/40) * 62.49KHz 0 1 ±2.00% (FIN/40) * 62.49KHz 1 0 ±0.25% (FIN/40) * 62.49KHz 1 1 ±0.75% (FIN/40) * 62.49KHz Schematic for Notebook VGA Application P1708C NC CLKIN 8 Pin 8 can be tied either high or low, or it can be left unconnected. 2 VDD SR0 7 3 VSS SR1 6 Tie SR0 and SR1 high / low according to spread range desired. External resistors are not needed to pull these pins high. 4 ModOUT 50MHz to 110MHz pixel clock input from VGA chip. 1 0.1µF FB VDD SSON 5 Pin 5 SSON should be left unconnected to turn on spread spectrum. Pull this pin low to turn spread spectrum OFF and enable stand-by mode. 50MHz to 110MHz Pixel Clock Input from VGA Chip. Note: To set the P1708C to standby mode, disable the input clock (pin 1 CLKIN) and pull SSON (pin 5) low. Refer to Standby Mode Selection Table. 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 Ts Max. Soldering Temperature (10 sec) 260 °C TJ Junction Temperature 150 °C TDV Static Discharge Voltage (As per JEDEC STD22- A114-B) 2 KV Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect device reliability. Operating Conditions Parameter Min Max Unit Supply Voltage 2.7 3.7 V TA Operating Temperature (Ambient Temperature) -40 +85 °C CL Load Capacitance 15 pF CIN Input Capacitance 7 pF VDD Description Rev. 2 | Page 3 of 7 | www.onsemi.com P1708C 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 (pull-up resistors on inputs SR0, SR1 and SSON/SBM) -35 µA IIH Input high current 35 µA IXOL XOUT output low current @ 0.4V, VDD = 3.3V 3 mA IXOH XOUT output high current @ 2.5V, VDD = 3.3V 3 mA VOL Output low voltage VDD = 3.3V, IOL = 20mA VOH Output high voltage VDD = 3.3V, IOH = 20mA ICC Dynamic supply current normal mode 3.3V and 10pF loading IDD Static supply current standby mode VDD Operating voltage tON Power up time (first locked clock cycle after power up) ZOUT 0.4 2.5 V 7.90 9.79 2.7 fIN Parameter 17.53 fIN -max 0.6 Min Typ mA mA 3.3 Clock output impedance AC Electrical Characteristics Symbol V 3.7 V 0.18 mS 50 Ω Max Unit Input frequency 50 110 MHz fOUT Output frequency 50 110 MHz 1 tLH Output rise time Measured at 0.8V to 2.0V 0.7 0.9 1.1 ns tH 1 Output fall time Measured at 0.8V to 2.0V 0.6 0.8 1.0 ns tJC Jitter (cycle-to-cycle) 360 ps tD Output duty cycle 55 % 45 Note: 1. tLH and tHL are measured into a capacitive load of 15pF. Rev. 2 | Page 4 of 7 | www.onsemi.com 50 P1708C Package Information 8-Pin SOIC Package H E D A2 A θ C D e A1 L B Dimensions Symbol Inches Min Max Millimeters Min Max A1 0.004 0.010 0.10 0.25 A 0.053 0.069 1.35 1.75 A2 0.049 0.059 1.25 1.50 B 0.012 0.020 0.31 0.51 C 0.007 0.010 0.18 0.25 D 0.193 BSC 4.90 BSC E 0.154 BSC 3.91 BSC e 0.050 BSC 1.27 BSC H 0.236 BSC 6.00 BSC L 0.016 0.050 θ 0° 8° 0.41 1.27 0° 8° Note: Controlling dimensions are millimeters. SOIC: 0.074 grams unit weight. Rev. 2 | Page 5 of 7 | www.onsemi.com P1708C 8-Pin TSSOP H E D A2 A θ e C A1 L B Dimensions Symbol Inches Min Millimeters Max A Min Max 0.043 1.10 A1 0.002 0.006 0.05 0.15 A2 0.033 0.037 0.85 0.95 B 0.008 0.012 0.19 0.30 C 0.004 0.008 0.09 0.20 D 0.114 0.122 2.90 3.10 E 0.169 0.177 4.30 4.50 e 0.026 BSC 0.65 BSC H 0.252 BSC 6.40 BSC L 0.020 0.028 θ 0° 8° 0.50 0.70 0° 8° Rev. 2 | Page 6 of 7 | www.onsemi.com P1708C Ordering Codes Part number Marking Package Type Temperature P1708CF-08SR AAY 8-Pin SOIC, Tape and Reel, Pb Free 0°C to +70°C P1708CF-08TR AAY 8-Pin TSSOP, Tape and Reel, Pb Free 0°C to +70°C A “microdot” placed at the end of last row of marking or just below the last row toward the center of package indicates Pb-free Licensed under US Patent #5,488,627 and #5,631,921 Note: This product utilizes US Patent #6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003. 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