HT8665 Datasheet, PDF (1/13 Pages) Holtek Semiconductor Inc – Talking Back with Echo

HT8665
Talking Back with Echo
Features
• _{Single power supply: 4.5V~5.5V}
• _{ADM algorithm}
• _{Auto playback with an echo effect}
• _{DRAM options:}
– _64K
– _256K
• _{Sampling rate options:}
– _{32K bps (bits per second)}
– _{16K bps}
Applications
• _Toys
• _Educations
General Description
The HT8665 is a single chip CMOS LSI using
an ADM algorithm. It is designed for applica-
tions on talking back with an echo effect. Func-
tions of the IC consist of recording/playing and
auto power off in addition to an echo effect. The
IC starts recording when a sound input is de-
tected, 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.
• _{Recording capacity: 2, 4, 8, 16 seconds}
• _{A built-in 2 stage microphone amplifier}
• _{A built-in DRAM refresh circuit}
• _{A voltage type D/A output}
• _{A current type D/A output}
• _{Auto power-off}
• _{Low power dissipation}
• _Games
The HT8665 provides a recording capacity of 2
seconds at a 32K bps sampling rate for DRAM
of 64K (8 seconds for DRAM of 256K) and 4
seconds at a 16K bps sampling rate (16 seconds
for DRAM of 256Kb). A higher sampling rate
results in sounds of better quality but sacrifices
the recording time, and vice versa.
1
21st Dec ’95