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HT8665

Holtek Semiconductor
Part Number HT8665
Manufacturer Holtek Semiconductor
Description Talking Back
Published Jul 4, 2010
Detailed Description HT8665 Talking Back with Echo Features • • • • www.DataSheet4U.com • Single power supply: 4.5V~5.5V ADM algorithm Aut...
Datasheet PDF File HT8665 PDF File

HT8665
HT8665

Overview
HT8665 Talking Back with Echo Features • • • • www.
DataSheet4U.
com • 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 • • • • • • • 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 Applications • • Toys Educations • Games General Description The HT8665 is a single chip CMOS LSI using an ADM algorithm.
It is designed for applications on talking back with an echo effect.
Functions 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 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 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 HT8665 www.
DataSheet4U.
com Pin Assignment A0 RASB WRB DATA 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 A2 A1 A3 A4 A5 NC A6 A7 VSS MS DS TESTB 16KB START AIN1 NC AIN2 AO1 BIAS ADMOUT Pad Assignment A8 NC CASB VDD MOTOR LEDB IOUT NC VOUT MIXIN NC NC NC MIXOUT OSC1 OSC2 HT8665 – 40 DIP Chip size: 3260 × 3080 (µm)2 * The IC substrate should be connected to VSS in the PCB layout artwork.
Block Diagram 2 21st Dec ’95 HT8665 www.
DataSheet4U.
com Pad Coordinates Pad No.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Unit: µm X –1447.
00 –1434.
00 –1447.
00 –1447.
00 –1429.
50 –1447.
00 –1...


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