HT8656

HT8656 Talking Back Features www.DataSheet4U.com Operating voltage: 4.5V~5.5V ADM algorithm DRAM selection: – 64K – 256K Sampling rate selection: – 32Kb – 16Kb Auto stop recording – 0.5 seconds silence is detected – Recording capacity is full Built-in 2-stage microphone amplifier Built-in DRAM refresh circuit Voltage type D/A output Current type D/A output Auto record and playback Auto power-off Low power consumption Applications Toys Education Games General Description The HT8656 is a single chip CMOS LSI for talking back applications using an ADM algorithm. Functions of the IC consist of recording/playing as well as auto power off. It starts recording when a sound input is detected, and stops to play back when silence lasts 0.5 seconds during recording. The auto power off function is activated once a REC/PLAY cycle has been implemented 64 times or an interval of silence exceeds 2 minutes. The HT8656 provides a recording capacity of 2 seconds for DRAM of 64K and 8 seconds for DRAM of 256K at a 32Kb sampling rate and double recording capacity at a 16Kb sampling rate. A higher sampling rate will result in sounds of better quality but sacrifice the recording time, and vice versa. 1 5th May ’98 HT8656 www.DataSheet4U.com Pin Assignment Block Diagram 2 5th May ’98 HT8656 www.DataSheet4U.com Pad Coordinates Chip size: 3276.6 × 3530.6 (µm)2 * The IC substrate should be connected to VDD in the PCB layout artwork. Unit: µm Pad No. 1...