HT8656 Datasheet, PDF (1/11 Pages) Holtek Semiconductor Inc – Talking Back

HT8656
Talking Back
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
General Description
The HT8656 is a single chip CMOS LSI for
talking back applications using an ADM algo-
rithm. Functions of the IC consist of record-
ing/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 sec-
onds during recording. The auto power off func-
tion is activated once a REC/PLAY cycle has
been implemented 64 times or an interval of
silence exceeds 2 minutes.
• _Games
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 record-
ing time, and vice versa.
1
5th May ’98