BL0306 Digital echo Description The BL0306 is a digital ECHO IC fabricated with silicon gate CMOS technology . The BL0306 converts an input analog signal to a digital signal and writes it into a memory IC,After a delay it reads out the digital signal from the memory IC and then converts to an analog signal again. Lower noise and distortion delay signal is obtained by BL0306 than by BBD. An A-D, D-A converter block formed of ADM (Adaptive Delta Modulation) circuit can produce a low-cost delay system.(compatible with M50915P) A6 MDI CAS RESET DO W RAS A0 A2 A1 A7 A5 A4 A3 D-GND CC1 CC2 SHORT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 BL0306 Pin Assignment 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 VCC LPF2 OUT2 LPF2 OUT1 LPF2 IN1 LPF2 IN2 OP2 OUT OP2 IN A-GND LPF1 IN LPF1 OUT OP1 OUT OP1 IN REF OSC IN OSC OUT LONG MIDD CDI PDIP 36Pin Features ・Low noise(-90dBV typ.) ・Low distortion(0.5% typ.) ・3 mode delay time (100,150,200ms) ・Includes auto mute circuit to protect sound from digital noise caused by delay time mode change or power on. Address： No.810, YiShan Road ShangHai China Tel：86-021-64850700 Fax：86-64852222 Zip.200233 BL0306 Digital echo Application Karaoke, Radio cassette tape recorder, Videodisc plaver. NP 4.7µ 1µ + 33K 0.1µ 6800p 47µ + 20K 0.1µ* 20K 1800p 10K 2.2K Feed back SW 15p 47µ 51K 27p 4MHz + 0.1µ SL SM 1M 680p Vcc 20K 27p 500 1µ + Compator M5233L or equal 0.01µ 500 IN 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 10K 1µ + 0.1µ 0.1µ Ss 500 0.1µ 1 NC 2 D 3 W VSS CAS Q 16 15 14 4 5 RAS A0 6 A2 7 A1 8 VDD A6 13 A4 11 A5 10 A7 9 A3 12 20K 64K Bit or 256K Bit D-RAM (f.e.：M5K4164ANP) Address： No.810, YiShan Road ShangHai China Tel：86-021-64850700 Fax：86-64852222 Zip.200233