DL8711 Analog delay with echo chip

The DL8711 is a single chip echo processor IC utilizing CMOS technology. Which
accept analog audio input signal, a high sample rate ADC transfer the analog signal
into a bit stream then storage to internal 44Kbit RAM, after processing the bit stream
will de-modulate by DAC and lowpass filter. The delay time is
determined by internal VCO clock frequency, and user can easy to change the VCO
frequency by changing the external resistance. The DL8711 performs low distortion
(THD<0.5%@0.5Vrms) and low noise (No<-90dBV) characteristic for audio purpose,
and pin arrangement and applica