ADC-to-PC interface transfers data in nibbles

Posted on Jun 11, 2012

The circuit in Figure 1 uses a Centronics printer port to interface an eight-channel, 8-bit ADC to a PC. The circuit cuts the cost of addressing and decoder circuitry and saves one expansion slot for interfacing. The design uses three of the subport`s various signals as control signals for channel selection, handshaking, and data transfer to the MAX158 ADC. These signals are programmable by means of a bit position in the control word of the respective port.

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