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HT8970 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 20Kb SRAM Automatic reset function Package type: 16-pin DIP/SOP
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 external VCO resistor. The VCO circuit can reduce external components and make it easy to adjust the delay time.
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HT8970
Block Diagram
L P F 1 _ IN LPF1_O U T LPF2_O U T L P F 2 _ IN O P2_O UT O P 2 _ IN O P 1 _ IN O P1_O UT CC0 CC1
4 .7 k W COMP
4 .7 k W
MOD DEM
LPF2
LPF1
1 /2 V C C AUTO RESET
DI MO MI CLO CK
DO0
DO1
2 0 K B its RAM
VCO
VCC
REF
AGND
DGND
O SC _O
vco
Pin Assignment
VCC REF AGND DGND O SC_O VCO CC1 CC0 8 7 6 5 4 3 2 1 16 15 14 13 12 11 10 9 L P F 1 _ IN LPF1_O U T LPF2_O U T L P F 2 _ IN O P2_O UT O P 2 _ IN O P 1 _ IN O P1_O UT
H T8970 1 6 D IP /S O P
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HT8970
Pad Assignment
LPF1_O U T LPF2_O U T L P F 1 _ IN L P F 2 _ IN AGND 1 16 VCC 14 REF 15 DGND
13
12
11
10
(0 ,0 )
O SC _O VCO CC1 4 3
2
5 CC0
6 7 O P1_O UT
8 O P 2 _ IN
9 O P2_O UT
Chip size: 1790 2215 (mm)
* The IC substrate should be connected to VSS in the PCB layout artwork.
O P 1 _ IN
2
Pad Coordinates
Pad No. 1 2 3 4 5 6 7 8 X -698.00 -669.25 -669.25 -669.25 -405.55 -140.05 123.65 389.15 Y 701.70 -614.45 -762.85 -945.30 -945.30 -945.30 -945.30 -945.30 Pad No. 9 10 11 12 13 14 15 16 X 652.85 720.20 571.80 423.40 275.00 -77.60 -306.55 -560.95
Unit: mm Y -945.30 882.55 882.55 882.55 882.55 877.60 849.95 737.70
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HT8970
Pad Description
Pad No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Pad Name DGND OSC_O VCO CC1 CC0 OP1_OUT OP1_IN OP2_IN OP2_OUT LPF2_IN LPF2_OUT LPF1_OUT LPF1_IN VCC REF AGND I/O I O I 3/4 3/4 O I I O I O O I I I I Internal Connection 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 Digital ground System oscillator output System oscillator input, system frequency adjustable pin Current control 1 Current control 0 OP1 output OP1 input OP2 input OP2 output Low pass filter 2 input Low pass filter 2 output Low pass filter 1 output Low pass filter 1 input Analog and positive power supply Analog reference voltage Analog ground Description
Absolute Maximum Ratings
Supply Voltage.................................-0.3V to 6V Input Voltage .................VSS-0.3V to VDD+0.3V Storage Temperature.................-50C to 125C Operating Temperature ..............-20C to 70C
Note: These are stress ratings only. Stresses exceeding the range specified under Absolute Maximum Ratings may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
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HT8970
Electrical Characteristics
Symbol VCC ICC GV VOMAX THD NO PSRR Parameter Operating Voltage Operating Current Voltage Gain Maximum Output Voltage Total Harmonic Distortion Output Noise Voltage Power Supply Rejection Ratio Test Conditions VDD 3/4 5V 5V 5V 5V 5V 5V Conditions 3/4 3/4 RL=47kW THD=10% 30kHz L.P.F. DIN Audio DVCC=-20dBV (0.1Vrms) f=100Hz Min. 4.5 3/4 3/4 0.9 3/4 3/4 3/4 Typ. 5.0 15 -0.9 1.8 0.7 -85 -40 Max. 5.5 30 2.5 3/4 1.5 -60 -30 Ta=25C Unit V mA dB Vrms % dBV dB
Functional Description
The HT8970 is an echo/surround effect generator with built-in 20Kb 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 follows.
* Surround mode
V
IN
* Echo mode
V V
IN OUT
LPF1
A /D
D e la y
D /A
LPF2
LPF1
A /D
D e la y
D /A
LPF2
V
OUT
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HT8970
ROSC-fOSC-Delay_time-Distortion Cross table ROSC fOSC Td THD 49.8 2M 327.6 1.6 38.3 2.5M 262 1.3 31.9 3M 218.4 1.0 26.77 3.5M 187.2 0.72 23.3 4M 163.8 0.7 20.54 4.5nm 145.6 0.64 18.08 5M 131 0.5 kW MHz ms %
ROSC fOSC Td THD
16.07 5.5M 119.1 0.47
14.29 6M 109.2 0.38
12.98 6.5M 100.8 0.36
11.97 7M 93.6 0.35
11 7.5M 87.36 0.3
9.99 8M 81.89 0.29
9.22 8.5M 77.08 0.28
kW MHz ms %
ROSC fOSC Td THD
8.5 9M 72.79 0.25
7.54 10M 65.52 0.245
6.66 11M 59.56 0.23
6.12 12M 54.59 0.22
5.5 13M 50.39 0.19
4.85 14M 46.79 0.185
4.4 15M 43.68 0.165
kW MHz ms %
ROSC fOSC Td THD
3.98 16M 40.94 0.165
3.64 17M 38.54 0.15
3.26 18M 36.39 0.14
2.92 19M 34.48 0.14
2.69 20M 32.75 0.13
2.48 21M 31.19 0.12
2.28 22M 29.78 0.11
kW MHz ms %
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HT8970
Application Circuits
Echo mode
0 .6 8 m F M IC 2 4 .7 k W 4 .7 k W 47kW 100mF 9V 4 .7 k W 4 .7 k W 560W 22mF 1kW 1mF 1kW 3 8 4558 4 47kW 39pF 5600pF 15kW 4 .7 m F 4 .7 m F 100kW 1 9V 4 .7 m F 20kW
5V 0 .1 m F
1 100mF 4 .7 m F 4 5 20kW R 6 3 2
VCC REF AGND DGND O SC _O VCO
L P F 1 _ IN LPF1_O U T
16 15
10kW 560pF 12kW 13kW
4 .7 k W 10mF 0 .0 3 3 m F 15kW
10mF
O u tp u t
LPF2_O U T L P F 2 _ IN O P2_O UT 7 8 0 .1 m F 0 .1 m F
14 13 12
15kW 560pF 10kW 15kW 0 .0 4 7 m F 560pF
CC1 CC0
O P 2 _ IN O P 1 _ IN O P1_O UT 9
11 10
0 .0 4 7 m F
HT8970
Note: : Analog ground, : Digital ground
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HT8970
Surround mode
0 .6 8 m F M IC 2 4 .7 k W 4 .7 k W 47kW 100mF 9V 4 .7 k W 4 .7 k W 560W 22mF 1kW 1mF 1kW 3 8 4558 4 47kW 39pF 5600pF 15kW 4 .7 m F 100kW 5V 0 .1 m F 1 100mF 4 .7 m F 4 5 20kW R 6 3 2 VCC REF AGND DGND O SC _O VCO LPF2_O U T L P F 2 _ IN O P2_O UT 7 8 0 .1 m F 0 .1 m F 14 13 12 560pF 10kW 15kW 11 10 9 0 .0 4 7 m F 0 .0 4 7 m F 15kW 560pF 10mF 3kW O u tp u t LPF1_O U T 15 12kW L P F 1 _ IN 16 10kW 560pF 1 9V 4 .7 m F 20kW
CC1 CC0
O P 2 _ IN O P 1 _ IN O P1_O UT
HT8970
Note:
: Analog ground,
: Digital ground
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HT8970
Holtek Semiconductor Inc. (Headquarters) No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C. Tel: 886-3-563-1999 Fax: 886-3-563-1189 Holtek Semiconductor Inc. (Taipei Office) 5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C. Tel: 886-2-2782-9635 Fax: 886-2-2782-9636 Fax: 886-2-2782-7128 (International sales hotline) Holtek Semiconductor (Hong Kong) Ltd. RM.711, Tower 2, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Rd., Kowloon, Hong Kong Tel: 852-2-745-8288 Fax: 852-2-742-8657 Copyright O 2000 by HOLTEK SEMICONDUCTOR INC. The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes 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 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.
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