AD574A interface circuit

Published:2011/5/16 7:55:00 Author:Christina | Keyword: interface circuit | From:SeekIC

The 8051 single chip device and the AD574A's interface circuit is as shown, this circuit uses the three-state latcher 74LS373 and 74LS00 NAND gate circuit, the logic control signal is output by the 8051's data port, and latches to the output ports Q0, Q1 and Q2 by three-state latcher 74LS373 to control the working process of the AD574A. Figure. AD574A interface circuit AD converter's output data connects to the 8051 by P0 data bus, because we only use the 8-bit data port, so the 12-bit data reads into 8051 twice, so we connect it to the ground. When 8051's p3.0 inquires the STS port conversion end signal, the circuit will read the 12-bit A/D data's high 8-bit into 8051 first, then the low 4-bit.



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