Holtek Semiconductor Inc HT8970 Datasheet
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%
Applications
Television
·
Karaoke systems
·
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.
HT8970
Voice Echo
Built-in 20Kb SRAM
·
Automatic reset function
·
Package type: 16-pin DIP/SOP
·
Video disc player
·
Sound equipments
·
Its built-in 20Kb SRAM can generate delay
time effect and can control the delay time value
through the external VCO resistor.
The VCO circuit can reduce external compo
nents and make it easy to adjust the delay time.
-
1 March 14, 2000
Block Diagram
LPF1_IN
LPF1_O U T LPF2_O U T LP F2_IN O P2_O U T O P 2_IN O P 1_IN O P 1_O U T C C 0 C C 1
4.7k
HT8970
4.7k
W
W
MOD
COM P
LPF1
1/2 V C C
AUTO
RESET
VCC AGND DGND
Pin Assignment
16
1
VCC
15
2
REF
14
VCO
CC1
CC0
H T 8 9 7 0
16 D IP /SO P
3
13
4
12
5
11
6
10
7
8
9
AGND
DGND
OSC_O
LPF2
DI
MO MI CLOCK
20K Bits
RAM
OSC_OREF
LPF1_IN
LPF1_O U T
LPF2_O U T
LPF2_IN
O P 2_O U T
O P 2_IN
O P 1_IN
O P 1_O U T
DEM
DO0 DO1
VCO
vco
2 March 14, 2000
HT8970
Pad Assignment
* The IC substrate should be connected to VSS in the PCB layout artwork.
DGND
OSC_O
VCO
CC1
LPF2_O U T
LPF1_O U T
AGND
16
1
2
3
4 5
CC0
REF
15
6
O P1_O U T
VCC
14
(0 ,0 )
7
O P1_IN
LPF1_IN
13
12
8
O P2_IN
Chip size: 1790 ´ 2215 (mm)
LPF2_IN
10 11
9
O P2_O U T
2
Pad Coordinates
Pad No. X Y Pad No. X Y
1
-698.00
2
-669.25 -614.45
3
-669.25 -762.85
4
-669.25 -945.30
5
-405.55 -945.30
6
-140.05 -945.30
7 123.65
8 389.15
701.70 9 652.85
10 720.20 882.55
11 571.80 882.55
12 423.40 882.55
13 275.00 882.55
-945.30
-945.30
14
15
16
-77.60
-306.55
-560.95
3 March 14, 2000
Unit: mm
-945.30
877.60
849.95
737.70
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