The ADC ADC data acquisition component is a monolithic CMOS device with an 8-bit analog-to-digital con- verter 8-channel multiplexer and. ADC ADC – 8-bit Microprocessor Compatible A/D Converters With 8- Channel Multiplexer, Details, datasheet, quote on part number: ADC The ADC/ADC Data Acquisition Devices (DAD) implement on a single chip most the elements of the stan- dard data acquisition system. They contain.
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That is because ADCs require clocking and can contain control logic including comparators and registers.
ADC Technical Data
A, B, and C. Bottom rail of Reference voltage. Control signal from FPGA. C is the most significant bit and A is the least. It is a control signal from the FPGA, which tells the converter when to start a conversion.
National Semiconductor
Be sure to consult the manufactures data-sheets for other chips. It is a pulse of at least ns in width. Datasheett start signal should conform to the same range as all other control signals. It is the Second bit of the select lines. As with all control signals it is required to have an input value of Vcc – 1. Users can look for a rising edge transition. The Dafasheet signal should conform to the same range as all the other control signals. Signal from the ADC.
This means it must remain stable for up to 72 clock cycles. The source code provided was used to control an ADC where only 4 inputs were used, therefore, ADD C is tied to ground and so are the unused inputs. There are a couple of limitations that follow: Source code The source code consists of a few of files.
This means that an entire conversion takes at least 64 clock cycles. The voltage level that, when received as an input, will output “” to the FPGA.
The maximum clock frequency is affected by the source impedance of the analog inputs.
It is the LSB of the select lines. You will also need to download multiplex. Modification to the source code are required to use more than just four channels.
See table 1 for details.
This is a bit of the digital converted output. At clock speeds greater than that the user must make certain that enough time has passed since the ALE signal was pulsed so that the correct address is loaded into the multiplexer before a conversion begins.
On the rising edge of the pulse the internal registers are cleared and on the falling edge of the pulse the conversion is initiated. The other files are enabled register, a register, and a multiplexer.
It is the MSB of the select lines. It can be tied to the Start line if the clock is operated under kHz.
This is an address select line for the multiplexer. Begin by downloading the files into your desired destination directory and then compile them in this order. The maximum frequence of the clock is 1. The source resistance must be below 10kohms for operation below kHz and below 5kohms for operation around 1.