The IIS Chip Gallery
Dodu (2024)
by
| Application | Audio |
| Technology | 65 |
| Manufacturer | TSMC |
| Type | Research |
| Package | QFN 40 |
| Dimensions | 2000μm x 2000μm |
| Voltage | 2.5 V |
| Power | 30 mW |
| Clock | 3.5 MHz |
Dodu is a bucket brigade delay chip that aims to improve upon the outdated MN3007, which is used in many audio effect circuits such as chorus, flanger, or echo. A bucket brigade delay can be described best as an analog shift register that allows for delaying continuous-valued signals by discrete-time sampling. The amount of delay is set by the number of stages and the clock frequency. Dodu improves on the classic MN3007 by offering true stereo capability, multiple output taps per delay line, an improved output sampling stage to eliminate bleed of the clock frequency to the output, and an integrated clocking circuitry that eliminates the need for an additional IC which was required to operate the MN3007.
This chip was designed and produced as a semester project. Its name references a cute two-headed bird Pokemon, which is a nod to the chip's stereo capability.