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PDF HT8970 Data sheet ( Hoja de datos )
| Número de pieza | HT8970 | |
| Descripción | Voice Echo | |
| Fabricantes | Holtek Semiconductor Inc | |
| Logotipo |  |
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HT8970
Voice Echo
Features
· Operating voltage: 4.5V~5.5V
· ADM algorithm
· Low noise
- Echo mode: -85dB
- Surround mode: -90dB
· Built-in 20Kb SRAM
· Automatic reset function
· 16-pin DIP/SOP package
Applications
· Television
· Karaoke systems
· Video disc player
· Sound equipments
General Description
The HT8970 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,
20Kb SRAM, A/D and D/A converters as well as delay
time control logic.
Its built-in 20Kb 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
DI
MO MI
AU TO
RESET
2 0 K B its
RAM
C LO C K
VCO
VCC REF
AG ND DG ND
O S C _O
VCO
DO0 DO1
Rev. 1.10
1 May 2, 2008
1 page  
HT8970
Application Circuits
Echo Mode
M IC
5V
0 .6 8 m F 1 k W
1mF 1kW
4 .7 k W 4 .7 k W 4 7 k W
560W
100mF
22mF
4 .7 k W
9V
4 .7 k W
1 VCC
L P F 1 _ IN 1 6
0 .1 m F
100mF
2 REF
4 .7 m F 3 A G N D
LP F1_O U T 15
4 DGND
5 O S C _O
20kW R 6 V C O
LP F2_O U T 14
L P F 2 _ IN 1 3
O P 2_O U T 12
0 .1 m F 0 .1 m F
7 CC1
8 CC0
O P 2 _ IN 1 1
O P 1 _ IN 1 0
O P 1_O U T 9
9V
38
2 4558
4
1
47kW
39pF
4 .7 m F
20kW
5 6 0 0 p F 1 5 k W 4 .7 m F
1 0 k W 4 .7 m F
100kW
560pF
12kW
13kW
10mF
0 .0 3 3 m F
4 .7 k W
15kW
15kW
560pF
10kW
15kW
0 .0 4 7 m F
560pF
0 .0 4 7 m F
10mF
H T8970
O u tp u t
Note:
: Analog ground,
: Digital ground
When the value of the ROSC increases, the range of the Delay time also increases. Please refer to the
ROSC - fOSC - Delay_time Cross table for the ROSC & Delay time values.
Rev. 1.10
5 May 2, 2008
5 Page 
HT8970
Holtek Semiconductor Inc. (Headquarters)
No.3, Creation Rd. II, Science Park, Hsinchu, Taiwan
Tel: 886-3-563-1999
Fax: 886-3-563-1189
http://www.holtek.com.tw
Holtek Semiconductor Inc. (Taipei Sales Office)
4F-2, No. 3-2, YuanQu St., Nankang Software Park, Taipei 115, Taiwan
Tel: 886-2-2655-7070
Fax: 886-2-2655-7373
Fax: 886-2-2655-7383 (International sales hotline)
Holtek Semiconductor Inc. (Shanghai Sales Office)
7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China 200233
Tel: 86-21-6485-5560
Fax: 86-21-6485-0313
http://www.holtek.com.cn
Holtek Semiconductor Inc. (Shenzhen Sales Office)
5F, Unit A, Productivity Building, Gaoxin M 2nd, Middle Zone Of High-Tech Industrial Park, ShenZhen, China 518057
Tel: 86-755-8616-9908, 86-755-8616-9308
Fax: 86-755-8616-9722
Holtek Semiconductor Inc. (Beijing Sales Office)
Suite 1721, Jinyu Tower, A129 West Xuan Wu Men Street, Xicheng District, Beijing, China 100031
Tel: 86-10-6641-0030, 86-10-6641-7751, 86-10-6641-7752
Fax: 86-10-6641-0125
Holtek Semiconductor Inc. (Chengdu Sales Office)
709, Building 3, Champagne Plaza, No.97 Dongda Street, Chengdu, Sichuan, China 610016
Tel: 86-28-6653-6590
Fax: 86-28-6653-6591
Holtek Semiconductor (USA), Inc. (North America Sales Office)
46729 Fremont Blvd., Fremont, CA 94538
Tel: 1-510-252-9880
Fax: 1-510-252-9885
http://www.holtek.com
Copyright Ó 2008 by HOLTEK SEMICONDUCTOR INC.
The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek as-
sumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used
solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable
without further modification, nor recommends the use of its products for application that may present a risk to human life
due to malfunction or otherwise. Holtek¢s products are not authorized for use as critical components in life support devices
or systems. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information,
please visit our web site at http://www.holtek.com.tw.
Rev. 1.10
11 May 2, 2008
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet HT8970.PDF ] | |
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