HT8972

HT8972 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 40Kb SRAM · Automatic reset function · 16-pin DIP/SOP package Applications · Television · Karaoke systems · Video disc player · Sound equipments General Description The HT8972 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, 40Kb SRAM, A/D and D/A converters as well as delay time control logic. Its built-in 40Kb 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. 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 AU TO RESET DI M O M I C LO C K 4 0 K B its RAM VCO VCC REF AG ND DG ND O SC _O v c o DO0 DO1 Rev. 1.00 1 December 23, 2008 Pin Assignment Pad Assignment VCC REF AG ND DGND O S C _O VCO CC1 CC0 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 H T8972 1 6 D IP -A /S O P -A L P F 1 _ IN LP F1_O U T LP F2_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 HT8972 L P F 2 _ IN LP F2_O U T LP F1_O U T L P F 1 _ I...