Princeton Technology Corp. Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Tone Control Subwoofer Low Pass Filter IC PT2350 DESCRIPTION PT2350 is a tone control subwoofer cross-over low pass filter chip utilizing CMOS Technology. It features a tone control range of + 10dB (50Hz, 4 KHz) and subwoofer low pass filter of the second order Sallen Key Design. The roll-off point can be adjusted by changing the value of the external capacitor. Pin assignments and application circuits are optimized for easy PCB Layout and cost saving advantages. FEATURES !CMOS Technology !2 - Channel Input !3 - Channel Output (Including 1 stereo Output and Subwoofer Output) !Low Total Harmonic Distortion (THD<0.01%, Subwoofer THD<0.2%) !High S/N Ratio (S/N Ratio <-87dB, A-weighting) !Least External Components !Adjustment of Frequency response by changing the value of the external component !Single Power Supply: 3 to 8.5 Volts !Available in 20 pins, DIP or SO Package APPLICATIONS !Multi-Media 3D Satellite Speaker and Subwoofer System !Car Audio !Audio Equipment !Sound Card !Other Electrical Audio Equipment Ref. No. 2350 v1.1 1 Written July 1999 Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Princeton Technology Corp. Tone Control Subwoofer Cross-Over Low Pass Filter IC PT2350 PIN CONFIGURATION LIN LB1 LB2 LB3 LT1 LT2 LOUT VREF C2 Vss 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 RIN RB1 RB2 RB3 RT1 RT2 ROUT SOUT C1 VDD PT2350 Ref. No. 2350 v1.1 2 Written July 1999 Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Princeton Technology Corp. Tone Control Subwoofer Cross-Over Low Pass Filter IC PT2350 APPLICATION CIRCUIT + 2 2 1 10K 100K (B) VR Left Channel Treble Control VR 3 100K (B) VR 1 Left Channel Output 2 CH1 0.005uF + 4.7uF/16V + 4.7uF/16V 0.15uf RIN LIN RB1 LB1 RB2 LB2 RB3 LB3 RT1 LT1 RT2 LT2 R LOUT OUT VREF SOUT C1 C2 VDD Vss PT2350 1 Right Channel Bass Control VR 3 10K CL2 0.05uF 2 100K (B) VR 1 Right Channel Treble Control VR 3 0.005uF CH2 100K (B) VR 2 1 Right Channel Output 4.7uF/16V 0.068uF Subwoofer Output 4.7uF/16V 12V 220Ohms + CL1 0.05uF 4.7uF 4.7uF Left Channel Bass Control VR 3 2 1 Right Channel Input 3 10K VR (A) C1 8.2VZD + 3 10KVR (A) + Left Channel Input 100uF Notes: 1. If you use the above values: Treble Control Range = 4KHz + 10 dB Bass Control Range = 50 Hz + 10 dB Subwoofer Output Roll-Off Point is at -3dB at 130Hz Slope Rate = -12dB/oct 2. It is recommended that you use Mylar or Metal Capacitors for better audio quality. 3. Please do not connect 0.1µF or any by-pass capacitor between the GND and VDD. Ref. No. 2350 v1.1 3 Written July 1999 Princeton Technology Corp. Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Tone Control Subwoofer Low Pass Filter IC PT2350 ORDER INFORMATION Ref. No. 2350 v1.1 Valid Part N umber Package Type PT2350 20 pins, DIP (300 mil) PT2350- S 20 pins, SO (300 mil) 4 Written July 1999