Holtek HT8970 free download

File name HT8970.pdf

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. 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 O P 2 _ IN O P 1 _ IN O P 1 _ O U T C C 0 C C 1 4 .7 k W C O M P 4 .7 k W 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 D I M O M I C L O C K D O 0 D O 1 2 0 K B its R A M V C O V C C R E F A G N D D G N D O S C _ O v c o Pin Assignment V C C R E F A G N D D G N D O S C _ O V C O C C 1 C C 0 8 7 6 5 4 3 2 1 1 6 1 5 1 4 1 3 1 2 1 1 1 0 9 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 O P 2 _ IN O P 1 _ IN 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 L P F 1 _ O U T L P F 2 _ O U T L P F 1 _ IN L P F 2 _ IN A G N D 1 1 6 V C C 1 4 R E F 1 5 D G N D 1 3 1 2 1 1 1 0 (0 ,0 ) O S C _ O V C O C C 1 4 3 2 5 C C 0 6 7 O P 1 _ O U T 8 O P 2 _ IN 9 O P 2 _ O U T Chip size: 1790 ґ 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 3 March 14, 2000 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 ѕ ѕ O I I O I O O I I I I Internal Connection ѕ ѕ ѕ ѕ ѕ ѕ ѕ ѕ ѕ ѕ ѕ ѕ ѕ ѕ ѕ ѕ 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 Tem