Princeton Technology Corp. Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Enhanced Digital Echo IC PT2395 DESCRIPTION PT2395 is a silicon gate CMOS-processed digital echo IC functionally compatible with M50195P. Input signal to PT2395 is converted to digital signal with A-D conversion then stored in the memory (DRAM) chip. After a certain delay time, digital signal is read out from the memory chip and then converted back into analog signal using the D-A conversion. A low cost echo system may thus be achieved with PT2395’s A-D converter, D-A converter, incorporating ADM algorithm, while maintaining lower noise, lower distortion, higher S/N ratio as compared to the conventional BBD (Bucket Brigate Device). PT2395 further features enhanced functions such as continuous delay time with external VR (Variable Resistor), 256 K DRAM support for longer delay time (Extended Delay Mode, up to 800 ms at 4 MHz Clock) as compared to M50195P. Moreover, the distortion and the S/N Ratio are further improved. FEATURES • • • • • • • • CMOS Technology Available in 40-pin PDIP Package (600 mil) Low Noise, Low Distortion Echo System 3-Level Delay Time Selectable, with Indicator Output On-chip RC Oscillator for Continuous Delay Time 64K/256K DRAM chip support Extended Delay Mode up to 800 ms Delay Time (without VR) Create fascinating echo effect with time delay APPLICATIONS • • • • KARAOKE Radio Set Video Disc Player Electronic Musical Instrument Ref. No. 2395 v1.1 1 Written Dec. 1998 Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Princeton Technology Corp. Enhanced Digital Echo IC PT2395 BLOCK DIAGRAM PIN CONFIGURATION NC Vcc LPF202 LPF201 LPF2I1 LPF212 OP2O OP21 A-GND LPF-1I LPF1O OP1O OP1I REF OSCI OSCO OSCX LONG MIDD CDI A8 A6 MDI CAS RESET DO W RAS A0 A2 A1 A7 A5 A4 A3 D-GND CC1 CC2 SHORT SEL P T 2395 Ref. No. 2395 v1.1 2 Written Dec. 1998 Princeton Technology Corp. Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Enhanced Digital Echo IC PT2395 APPLICATION CIRCUIT Ref. No. 2395 v1.1 10 Written Dec. 1998 Tel: 886-2-29162151 Fax: 886-2-29174598 URL: http://www.princeton.com.tw Princeton Technology Corp. Enhanced Digital Echo IC PT2395 ORDER INFORMATION Valid Part Number Package Type PT2395 40 PDIP (600 mil) PACKAGE INFORMATION 40-Pin, DIP Package (600 mil) A Dimension in Mil 2050 B 70 C 70 Symbol Ref. No. 2395 v1.1 11 Written Dec. 1998