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I2042AG-08TR Datasheet(PDF) 3 Page - PulseCore Semiconductor |
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I2042AG-08TR Datasheet(HTML) 3 Page - PulseCore Semiconductor |
3 / 9 page August 2007 P2042A rev 1.5 Notice: The information in this document is subject to change without notice. LCD Panel EMI Reduction IC 3 of 9 Spread Spectrum Selection The Modulation Selection Table defines 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, pin1). For example, P2042A is designed for high-resolution, flat panel applications and is able to support an XGA (1024 x 768) flat panel operating at 65MHz (FIN) clock speed. A spreading selection of CP0=0, CP1=1 and SR0=0 provides a percentage deviation of ±1.00% from FIN. This results in the frequency on ModOUT being swept from 65.65 to 64.35MHz at a modulation rate of 101.54KHz. Refer Modulation Selection Table. The example in the following illustration is a common EMI reduction method for a notebook LCD panel and has already been implemented by most of the leading OEM and mobile graphic accelerator manufacturers. Application Schematic for Mobile LCD Graphics Controllers Modulated 65MHz signal with ±1.00% deviation and modulation rate of 101.54KHz. This signal is connected back to the spread spectrum input pin (SSIN) of the graphics accelerator. 1 2 3 4 CLKIN CP0 CP1 VSS SR0 5 6 7 8 SSON# ModOUT VDD 65MHz from graphics accelerator +3.3V 0.1µF P2042A Digital control for the SS enable or disable |
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