name:         HT8970
function:     Voice Echo
package:      DIP/SOP16,16
manufacturer: Holtek

      +--()--+
  VCC | 1  16| LPF1_IN
  REF | 2  15| LPF1_OUT
 AGND | 3  14| LPF2_OUT
 DGND | 4  13| LPF2_IN
OSC_O | 5  12| OP2_OUT
  VCO | 6  11| OP2_IN
  CC1 | 7  10| OP1_IN
  CC0 | 8   9| OP1_OUT
      +------+


This pinout came from the Chipdir:
http://www.chipdir.org/