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ADC
0804 free Running Mode
I had built this device when I built my final task. In my final task, fast sampling and fast system works is my priority. To fulfill this, I used an ADC 0804 free running mode. In this mode, ADC will always do a conversion without any tasking from system device (handshake etc). Only "start" task to make this device work.
This will reduce any tasking program. The program more simpler. It only need ADC START routine by give a low logic '0' to START (WR and INTR) input for a moment . To take a sample, I just use an immediate addressing at anytime I want to.
The ADC080X family are CMOS 8-Bit, successive-approximation A/D converters which use a modified potentiometric ladder and are designed to operate with the 8080A control bus via three-state outputs. These converters appear to the processor as memory locations or I/O ports, and hence no interfacing logic is required.
In this application, the CS input is grounded and the WR input is tied to the INTR output. This WR and INTR node should be momentarily forced to logic low following a power-up cycle to insure circuit operation.
The coverage features :
Schematic:
For Attention :
check the supply voltage, it must be about +5 V
Download Section :
OrCAD 9.1 : PCB Layout and Schematic
Literatures :
ADC 0803/4 datasheets , Intersil Semiconductor
Comment :
Any suggestions, comments, etc. E-mail me: fridiant@yahoo.com
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Tiar Fridianto @ 2004 : fridiant@yahoo.com