The Electric Druid DIGIDELAY is a 16-bit, 32-KHz delay processor. With the addition of a couple of SRAM chips, it can provide up to 4 seconds of delay. Iit offers the usual delay controls of Delay Time, Repeats, and Delay Level, plus high pass and lowpass shelving tone filters for the delayed signal. The chip uses onboard ADC/DAC, so there?s no external convertors to worry about.
The chip is included in this kit: DigiDelay kit
DIP 28 enclosure.
Here is the link to the datasheet.