HT8656 Datasheet | Holtek Semiconductor

Features - - - .. - - 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. 5th May ’98 .. Pin Assignment Block Diagram 5th May ’98 .. 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 2 3 4 5 6 7 8 9 10 11 12 13 14 15 - 1488.19 - 1488.19 - 1488.19 - 1488.19 -...