BU9252S

Multimedia ICs Audio digital delay (KARAOKE echo) BU9252S / BU9252F The BU9252S and BU9252F are digital delays specifically for Karaoke systems. Each has an internal sample hold circuit, an 8-bit A / D and D / A converter and 2kB SRAM, and allows for the selection of one of eight delay times just by attaching an inexpensive ceramic resonator. A digital echo system can be formed by using either of these ICs together with the BA7725S or BA7725FS. Applications Karaoke echo system Electronic circuits that require signal delays Features 1) Internal digital delay circuit. 2) Internal 8-bit A / D converter. Sample rate. (14.22kHz when fOSC = 455kHz). 3) Internal 2k bytes data SRAM. 4) Internal 8-bit D / A converter. 5) CMOS design for low power consumption. 6) Internal sample hold circuit. 7) Internal feedback resistors and capacitors for oscillator circuits. Block diagram 18 VDD 17 16 15 14 13 12 11 10 GND 9 OSCO TDO0 TDO1 OSCI DCNT2 8 TST0 TST1 TST2 TDIN TEST CIRCUIT 8 × 2k SRAM 8bit A/D 8bit D/A ADDRESS COUNTER AND MAIN TIMING 1 2 S/H 3 4 5 6 DCNT0 DCNT1 S/H AGND AIN AVDD AOUT 7 1 Multimedia ICs BU9252S / BU9252F Pin descriptions Pin No. 1 2 3 4 5 6 7 8 9 Pin name S/H AIN AGND AOUT AVDD DCNT0 DCNT1 DCNT2 GND Function For attaching sample-and-hold capacitor Analog input Analog circuit ground Analog output Analog circuit power supply Delay setting input Delay setting input Delay setting input Digital circuit ground Pin No. 10 11 12 13 14 15 16 17 1...