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| Princeton Technology Corp. Subwoofer Cross-Over Low Pass Filter IC DESCRIPTION Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2351 PT2351 is an 8-pin subwoofer cross-over low pass filter chip utilizing CMOS Technology having a slope rate of -12dB/oct or -18 dB/oct. Using an external capacitor, the roll-off point can be adjusted to meet your needs or taste. PT2351 has low distortion, high input impedance and low output impedance design. The application circuit and pin assignments are optimized for easy PCB Layout and cost saving benefits. FEATURES n CMOS Technology n Single Power Supply: 3V to 9V n Second Order Low Pass Filter Design with Slope Rate = -12dB/oct n Third Order Low Pass Filter Design with Slope Rate = -18 dB/oct n Low Output Impedance (Typ. 40 Ohms) n Least External Components n The Roll-Off Point can be adjusted using an External Capacitor n 2-Channel Inputs are mixed to a Single Subwoofer Output n Available in 8-pin, SO or DIP Package APPLICATIONS nMulti-Media Audio Subwoofer System nAudio Equipment nSound Card nHome Theater System PT2351 v1.2 1 Updated Nov. 1999 Princeton Technology Corp. Subwoofer Cross-Over Low Pass Filter IC PIN CONFIGURATION Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2351 VDD C1 SOUT R IN 1 2 3 4 8 7 6 5 VSS C2 VREF L IN P T 2351 ORDER INFORMATION Valid Part Number PT2351 PT2351-S Package Type 8 Pins, DIP 8 Pins, SO PT2351 v1.2 2 Updated Nov. 1999 Princeton Technology Corp. Subwoofer Cross-Over Low Pass Filter IC Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2351 SECOND ORDER LOW PASS FILTER APPLICATION CIRCUIT The Second Order Low Pass Filter application circuit only needs very few components. The Cross-Over Filter Point can be adjusted by modifying the values of capacitors -- C1, and C2. For better circuit characteristic, it is recommended that C2 be twice the value of C1. Please refer to the diagram below. 240 Ohm s 8 .2 V + 1 0 0 F +12V VDD VSS C2 VREF C1 C1 SOUT R IN C2 + L IN 1 0 0 F + GND 4 .7 F L -C H Inp u t 10F + + 4 .7 F P T 2 3 51 S U B -O U T R -C H In p u t PT2351 v1.2 3 Updated Nov. 1999 Princeton Technology Corp. Subwoofer Cross-Over Low Pass Filter IC THIRD ORDER APPLICATION CIRCUIT Tel : 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2351 If you need more High Frequency Attenuation, then you just need to add the R-C group between the capacitor 4.7F and the Input terminals (RIN and LIN) to achieve a Third Order Frequency Response. Please refer to the diagram below. 2 40 O h m s 8 .2 V + 1 00 F + 12 V VDD VSS C2 VREF C1 C1 SOUT R IN C2 + L IN 1 00 F + 4 .7 F R2 1 0 F + + 4 .7 F R1 PT2351 C3 C4 S U B -O U T R -C H Inp ut L -C H In p ut PT2351 v1.2 4 Updated Nov. 1999 |
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