ECEN 401

Project 1

August 23, 2023

Create an 4-bit unipolar input SAR A/D converter which will:

1. Initiate a conversion sequence on command

2. Present a digital parallel 4-bit conversion result (nibble) when data is ready

3. Have an input range of 0 to 5v DC

4. Have a data conversion rate of at least 100 samples/second (sps).

5. Have no missing codes

6. Use the unipolar or bipolar supply connections from the bench power supply as a

power source.

7. Have an adequate associated test plan in which all tests pass, the results of which

are to be included in the project report.

Your design must not use any modern processors with the following exceptions:

to act as control for your converter, such as issue a "start conversion/end conver-

sion" command.

to transfer data and display the result.

No 'all in one' ADC devices are allowed. You may use chips that implement the successive

approximation register, sample and hold, and comparator of your device. However, you

must design your own DAC.

Anything that is part of the 4000-series CMOS family or equivalent is fair game. You

have a budget of $100 for parts that cannot be found in the part store.