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PDF HT8972 Data sheet ( Hoja de datos )
| Número de pieza | HT8972 | |
| Descripción | Voice Echo | |
| Fabricantes | Holtek Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HT8972 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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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
1 page  
HT8972
Functional Description
The HT8972 is an echo/surround effect generator with
built-in 40Kb SRAM. It ensures low distortion as well as
low noise for processing audio signal delay. The chip
provides two playing modes (echo and surround) and
the playing function block diagrams are shown as fol-
lows.
· Surround mode
V IN L P F 1 A /D D e la y D /A L P F 2 V O U T
· Echo mode
V IN L P F 1
V OUT
A /D D e la y
D /A
LP F2
ROSC-fOSC-Delay_time-Distortion Cross table
ROSC
56.2
44 36.3
fOSC 2 2.5 3
Td 320 264 219
THD
1.3
1.05
0.815
30.6
3.5
188
0.625
25.9
4
164
0.58
23.1
4.5
147
0.525
20.7
5
132
0.43
kW
MHz
ms
%
ROSC
fOSC
Td
THD
18.5
16.7
15.1
14.5
13.9
11.9
10.9
kW
5.5 6 6.5 7 7.5 8 8.5 MHz
120 110 102 93 88 82 78 ms
0.4
0.335
0.315
0.3
0.275
0.26
0.25
%
ROSC
fOSC
Td
THD
10
9
73.2
0.23
9
10
65.6
0.218
8.06
11
59.2
0.205
7.3
12
54.4
0.19
6.4 5.8 5.3 kW
13 14 15 MHz
50 46 44 ms
0.17 0.1675 0.1575 %
ROSC
fOSC
Td
THD
4.8
16
41.2
0.16
4.4
17
38.4
0.145
4
18
36
0.14
3.7
19
33.6
0.14
3.3 3 2.8 kW
20 21 22 MHz
33 32 30 ms
0.13
0.125
0.12
%
Rev. 1.00
5 December 23, 2008
5 Page 
Product Tape and Reel Specifications
Reel Dimensions
T2
D
HT8972
AB
C
T1
SOP 16W (300mil)
Symbol
Description
A Reel Outer Diameter
B Reel Inner Diameter
C Spindle Hole Diameter
D Key Slit Width
T1 Space Between Flange
T2 Reel Thickness
Dimensions in mm
330.0±1.0
100.0±1.5
13.0+0.5/-0.2
2.0±0.5
16.8+0.3/-0.2
22.2±0.2
Rev. 1.00
11 December 23, 2008
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet HT8972.PDF ] | |
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