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 · · Video disc player Sound equipments Applications · · Television Karaoke systems General Description Its built-in 20Kb SRAM can generate delay time effect and can control the delay time value through the external VCO resistor. 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. The VCO circuit can reduce external components and make it easy to adjust the delay time. 1 March 14, 2000 HT8970 Block Diagram L P F 1 _ IN L P F 1 _ O U T L P F 2 _ O U T L P F 2 _ IN O P 2 _ O U T 4 .7 k W C O M P O P 2 _ IN O P 1 _ IN 4 .7 k W O P 1 _ O U T C C 0 C C 1 M O D D E M L P F 2 L P F 1 1 /2 V C C A U T O R E S E T R E F V C C D O 0 D I M O A G N D M I 2 0 K B its R A M D G N D D O 1 C L O C K V C O O S C _ O v c o Pin Assignment V C C 1 1 6 L P F 1 _ IN R E F 2 1 5 L P F 1 _ O U T A G N D 3 1 4 L P F 2 _ O U T D G N D 4 1 3 L P F 2 _ IN O S C _ O 5 1 2 O P 2 _ O U T V C O 6 1 1 O P 2 _ IN C C 1 7 1 0 O P 1 _ IN C C 0 8 9 O P 1 _ O U T H T 8 9 7 0 1 6 D IP /S O P 2 March 14, 2000 HT8970 Pad Assignment R E F V C C L P F 1 _ IN L P F 1 _ O U T L P F 2 _ O U T L P F 2 _ IN A G N D D G N D 1 5 1 4 1 3 1 2 1 1 1 0 1 6 1 (0 ,0 ) 2 O S C _ O 5 6 7 8 9 O P 2 _ IN O P 2 _ O U T 4 O P 1 _ IN C C 1 O P 1 _ O U T 3 C C 0 V C O 2 Chip size: 1790 ´ 2215 (mm) * The IC substrate should be connected to VSS in the PCB layout artwork. Pad Coordinates Unit: mm Pad No. X Y Pad No. X Y 1 -698.00 701.70 9 652.85 -945.30 2 -669.25 -614.45 10 720.20 882.55 3 -669.25 -762.85 11 571.80 882.55 4 -669.25 -945.30 12 423.40 882.55 5 -405.55 -945.30 13 275.00 882.55 6 -140.05 -945.30 14 -77.60 877.60 7 123.65 -945.30 15 -306.55 849.95 8 389.15 -945.30 16 -560.95 737.70 3 March 14, 2000 HT8970 Pad Description Pad No. Pad Name I/O Internal Connection Description 1 DGND I ¾ Digital ground 2 OSC_O O ¾ System oscillator output 3 VCO I ¾ System oscillator input, system frequency adjustable pin 4 CC1 ¾ ¾ Current control 1 5 CC0 ¾ ¾ Current control 0 6 OP1_OUT O ¾ OP1 output 7 OP1_IN I ¾ OP1 input 8 OP2_IN I ¾ OP2 input 9 OP2_OUT O ¾ OP2 output 10 LPF2_IN I ¾ Low pass filter 2 input 11 LPF2_OUT O ¾ Low pass filter 2 output 12 LPF1_OUT O ¾ Low pass filter 1 output 13 LPF1_IN I ¾ Low pass filter 1 input 14 VCC I ¾ Analog and positive power supply 15 REF I ¾ Analog reference voltage 16 AGND I ¾ Analog ground Absolute Maximum Ratings Supply Voltage.................................-0.3V to 6V Storage Temperature.................-50°C to 125°C Input Voltage .................VSS-0.3V to VDD+0.3V Operating Temperature ..............-20°C to 70°C Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² 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. 4 March 14, 2000 HT8970 Electrical Characteristics Symbol Ta=25°C Test Conditions Parameter VDD Conditions Min. Typ. Max. Unit VCC Operating Voltage ¾ ¾ 4.5 5.0 5.5 V ICC Operating Current 5V ¾ ¾ 15 30 mA GV Voltage Gain 5V RL=47kW ¾ -0.9 2.5 dB VOMAX Maximum Output Voltage 5V THD=10% 0.9 1.8 ¾ Vrms THD Total Harmonic Distortion 5V 30kHz L.P.F. ¾ 0.7 1.5 % NO Output Noise Voltage 5V DIN Audio ¾ -85 -60 dBV PSRR Power Supply Rejection Ratio 5V DVCC=-20dBV (0.1Vrms) f=100Hz ¾ -40 -30 dB Functional Description · Echo mode 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. V V IN L P F 1 A /D O U T D e la y D /A L P F 2 · Surround mode V IN L P F 1 A /D D e la y D /A L P F 2 V O U T 5 March 14, 2000 HT8970 ROSC-fOSC-Delay_time-Distortion Cross table ROSC 49.8 38.3 31.9 26.77 23.3 20.54 18.08 kW fOSC 2M 2.5M 3M 3.5M 4M 4.5nm 5M MHz Td 327.6 262 218.4 187.2 163.8 145.6 131 ms THD 1.6 1.3 1.0 0.72 0.7 0.64 0.5 % ROSC 16.07 14.29 12.98 11.97 11 9.99 9.22 kW fOSC 5.5M 6M 6.5M 7M 7.5M 8M 8.5M MHz Td 119.1 109.2 100.8 93.6 87.36 81.89 77.08 ms THD 0.47 0.38 0.36 0.35 0.3 0.29 0.28 % ROSC 8.5 7.54 6.66 6.12 5.5 4.85 4.4 kW fOSC 9M 10M 11M 12M 13M 14M 15M MHz Td 72.79 65.52 59.56 54.59 50.39 46.79 43.68 ms THD 0.25 0.245 0.23 0.22 0.19 0.185 0.165 % ROSC 3.98 3.64 3.26 2.92 2.69 2.48 2.28 kW fOSC 16M 17M 18M 19M 20M 21M 22M MHz Td 40.94 38.54 36.39 34.48 32.75 31.19 29.78 ms THD 0.165 0.15 0.14 0.14 0.13 0.12 0.11 % 6 March 14, 2000 HT8970 Application Circuits Echo mode 0 .6 8 m F 1 m F 1 k W 9 V 1 k W 3 M IC 2 8 4 .7 k W 4 .7 k W 4 7 k W 1 0 0 m F 4 .7 k W 9 V 1 5 V 0 .1 m F V C C 2 1 0 0 m F 3 4 .7 m F 4 2 0 k W 3 9 p F 5 6 0 0 p F 1 5 O S C _ O 6 V C O 8 1 0 k W 4 .7 m F 1 5 k W 1 0 0 k W 4 .7 m F 5 6 0 p F 4 .7 k W 1 2 k W 1 3 k W 5 R 0 .1 m F 1 6 D G N D 7 0 .1 m F 2 2 m F L P F 1 _ O U T A G N D 2 0 k W 4 7 k W L P F 1 _ IN R E F 4 5 6 0 W 4 .7 k W 4 .7 m F 1 4 5 5 8 1 0 m F 1 0 m F O u tp u t 1 5 k W 0 .0 3 3 m F L P F 2 _ O U T 1 4 L P F 2 _ IN 1 3 O P 2 _ O U T 1 2 C C 1 O P 2 _ IN C C 0 O P 1 _ IN 1 5 k W 5 6 0 p F 5 6 0 p F 1 0 k W 1 5 k W 1 1 0 .0 4 7 m F 1 0 9 O P 1 _ O U T 0 .0 4 7 m F H T 8 9 7 0 Note: : Analog ground, : Digital ground 7 March 14, 2000 HT8970 Surround mode 0 .6 8 m F 1 m F 1 k W 9 V 1 k W 3 M IC 2 8 4 .7 k W 4 .7 k W 4 7 k W 1 0 0 m F 4 .7 k W 9 V 4 2 0 k W 5 6 0 W 4 7 k W 2 2 m F 3 9 p F 5 6 0 0 p F 4 .7 k W 4 .7 m F 1 4 5 5 8 1 5 k W 4 .7 m F 1 0 0 k W 1 5 V 0 .1 m F V C C 2 1 0 0 m F 3 4 .7 m F 5 6 0 p F A G N D 4 2 0 k W 1 6 L P F 1 _ IN R E F 1 5 L P F 1 _ O U T D G N D 5 O S C _ O 6 V C O R 1 2 k W 8 0 .1 m F 0 .1 m F L P F 2 _ IN 1 3 O P 2 _ O U T 1 2 C C 1 O P 2 _ IN C C 0 O P 1 _ IN O P 1 _ O U T 1 0 m F 1 4 L P F 2 _ O U T 7 1 0 k W 5 6 0 p F 1 0 k W 3 k W O u tp u t 1 5 k W 5 6 0 p F 1 5 k W 1 1 0 .0 4 7 m F 9 1 0 0 .0 4 7 m F H T 8 9 7 0 Note: : Analog ground, : Digital ground 8 March 14, 2000 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 Ó 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. 9 March 14, 2000