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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Bottom rail of Reference voltage.

It is the LSB of the select lines. If Vcc and ground are used as reference voltages, they should be isolated by decoupling with a 1 microF capacitor.

It can be tied to the Start line if the clock is operated under kHz. Begin by downloading the files into your desired destination directory and then compile them in this order. The OE signal should conform to the same range as all the other control signals.

There are 8, 8 clock cycle periods required in order to complete an entire conversion. All of the signals are datssheet below. Users can look for a rising edge transition. That is because ADCs require clocking and can contain control logic including comparators and registers.

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 adc08099 loaded into the multiplexer before a conversion begins. Signal from the ADC. Note that it can take up to 2. The following control signals are used to control the conversion. The start signal should conform to the same range as all other control signals. It is a pulse of at dagasheet ns in width.


The voltage datasheeet that, when received as an input, will output “” to the FPGA. The minimum pulse width is ns. In this implementation the OE signal is pulsed high one clock cycle after the EOC signal goes high and remains high until the data is safely stored into the desired register in the FPGA.

The source resistance must be below 10kohms for operation below kHz and below 5kohms for operation around 1. Start The purpose of the start signal is two fold. You will also datsheet to download multiplex. As with all control signals it is required to have an input value of Vcc – 1. This means that in order to get it to work, there is a total of seven control signals that must be sent from the FPGA.

The ADC stores the data in a tri-state output asc0809 until the next conversion is started, but the data is only output when enabled.

Modification to the source code are datasgeet to use more than just four channels. A, B, and C. The clock should conform to the same range as all other control signals.


There are a couple of limitations that follow: Table 2 provides a summary of all of the input and output to the chip. Source code The source code consists of a few of files.

Clock The clock signal is required to cycle through the comparator stages to do the conversion.

National Semiconductor – datasheet pdf

All control signals should have a high voltage from Vcc – 1. On the rising edge of the pulse the internal registers are cleared and on the falling edge of the pulse the conversion is initiated. This is an address select line for the multiplexer.

The datashheet frequence of the clock is 1. See table 1 for details. The signal goes low once a conversion is initiated by the start signal and remains low until a conversion is complete. The signal can be tie to the ALE signal when the clock frequency is below kHz. 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. Be sure to consult the manufactures data-sheets for other darasheet.

National Semiconductor

Control signal from FPGA. C datahseet the most significant bit and A is the least. This means it must remain stable for up to 72 clock cycles.