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P2041AF-08TT Datasheet(PDF) 3 Page - PulseCore Semiconductor |
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P2041AF-08TT Datasheet(HTML) 3 Page - PulseCore Semiconductor |
3 / 8 page November 2006 P2041A rev 0.2 Versatile EMI Reduction IC 3 of 8 Notice: The information in this document is subject to change without notice. Spread spectrum selection Table 1 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). Example of a typical printer or scanner application that operates on a clock frequency of 40MHz: A spreading selection of SR1=1 and SR0=1 provides a percentage deviation of +/-1.00%* (see Table 1) of Center Frequency. This results in the frequency on ModOUT being swept from 40.40MHz to 39.60MHz at a modulation rate of (40/40)*34.72 = 34.72KHz (see Table 1). 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. P2041A Application Schematic for Flat-Bed Scanner Absolute Maximum Ratings Symbol Parameter Rating Unit VDD, VIN Voltage on any pin with respect to Ground -0.5 to +7.0 V TSTG 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 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. 1 2 3 4 8 7 6 5 VDD SR0 ModOUT SSON VSS SR1 XOUT XIN/CLK P2041A VDD Modulated 40MHz signal with ± 1.00% Deviation and modulation rate of 34.72KHz. 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) 40MHz 0.1µF |
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Similar Description - P2041AF-08TT |
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