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HT8972 fiches techniques PDF

Holtek Semiconductor - Voice Echo

Numéro de référence HT8972
Description Voice Echo
Fabricant Holtek Semiconductor 
Logo Holtek Semiconductor 





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HT8972 fiche technique
HT8972
Voice Echo
Features
· Operating voltage: 4.5V~5.5V
· ADM algorithm
· Low noise
- Echo mode: -85dB
- Surround mode: -90dB
· Low distortion rate
- Echo mode: 1%
- Surround mode: 0.2%
· Built-in 40Kb SRAM
· Automatic reset function
· 16-pin DIP/SOP package
Applications
· Television
· Karaoke systems
· Video disc player
· Sound equipments
General Description
The HT8972 is an echo/surround effect processor. It is
designed for various audio systems including karaoke,
television, sound equipments, etc. The chip consists of
a built-in pre-amplifier, VCO or Voltage Control OSC,
40Kb SRAM, A/D and D/A converters as well as delay
time control logic.
Its built-in 40Kb SRAM can generate delay time effect
and can control the delay time value through the exter-
nal VCO resistor.
The VCO circuit can reduce external components and
make it easy to adjust the delay time.
Block Diagram
L P F 1 _ IN
LP F1_O U T
L P F 2 _ O U T L P F 2 _ IN O P 2 _ O U T O P 2 _ IN O P 1 _ IN O P 1 _ O U T C C 0
CC1
COM P
LP F1
LP F2
4 .7 k W
4 .7 k W
MOD
DEM
1 /2 V C C
AU TO
RESET
DI
M O M I C LO C K
4 0 K B its
RAM
VCO
VCC REF
AG ND DG ND
O SC _O v c o
DO0 DO1
Rev. 1.00
1 December 23, 2008

PagesPages 13
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