Nov 17, the end of the data sheet. 2 Applications. • Operates With Any 8-Bit µP Processors or as a. Stand-Alone Device. • Interface to Temp Sensors. Category. Description, 8-bit Digital-to-analog Converters. Company, National Semiconductor Corporation. Datasheet, Download DAC datasheet. Cross ref. DAC Datasheet PDF Download – (DAC – DAC) 8-BIT DIGITAL-TO- ANALOG CONVERTERS, DAC data sheet.

Author: Tarr Arashikus
Country: Myanmar
Language: English (Spanish)
Genre: Music
Published (Last): 13 January 2014
Pages: 28
PDF File Size: 2.84 Mb
ePub File Size: 9.65 Mb
ISBN: 629-3-91430-302-6
Downloads: 54050
Price: Free* [*Free Regsitration Required]
Uploader: Aradal

The console program consists of two threads such as a main thread and a background thread.

In the part of music, since the music contains so much high frequency audio signal, the sample rate of our project could not capture those signals perfectly. The conversion will be started by setting pin 3 from 0 to 1.

The second 2 bytes are for 16 bits payload length of the command packet. For the choice of user interface, we initially decided to use the buttons on the STK board as the control panel. Since we used the following code to compute the value for OCR0 of Timer0, the accuracy of the sampling rate of audio signals varies. Also we used the timers to control the sampling frequency of voice and music signals as well as mixed signal output. The program gets the command from the graphical user interface and transmits it to the microcontroller, and at the same time receives the real time digital audio data from the microcontroller.

The sample code consists of a CWaveFile class. However, there is not enough internal memory, which is only 2 Kbytes that we decided not to apply this component. The console program exits and the Java application continues on its closing operation.


Our system is an excellent Karoke system to help people sing better; 6. When the software exits, it call CloseFile to release the serial port.

The mouse click is then turned into a command to the microcontroller via the COM Port. The Walki-Talki distortion option is done by distorting the voice signals to its square from the result of our tests. In order datasbeet obtain dca0801 signal of the music input, we used another external analog-to-digital converter ADC to transform the music signals into digital format.

A zero value means no echo. The code below is in charge of applying this effect to the voice signal. But for 3, 4, 6, 7 and 8KHz, there is a little deviation from the target integer value since there is a reminder when is divided by 3, 4, 6, 7 and 8.

1989 Linear Data Manual Volume 1 Communications

Testing the Microphone and the PreAmplifier Circuit. We also used an Op-Amp LM to amplify the signal strength.

Therefore we decided not to use it for our system. This section of code configures the port to be 8 bit data, no parity bit, one stop bit. The amplified catasheet signal of voice input is connected to PA0 to use the internal analog-to-digital converter to transform the voice signal into digital format.

National Semiconductor

However, we found that using a PC can provide a much flexible and user-friendly control interface. B1—B8 have identical transfer characteristics.

The reason to use the amplifier circuit before the signals being propagated to the ADC chip is similar to the circuit of the pre-amplifier that we discussed before. Since the ideas and implementation of our project hardware are solely our own, there should not be any trademark, patent, or copyright infringement issues.


This technique doubles the buffer requirement from bytes to bytes.

【DACLN NSC】Electronic Components In Stock Suppliers in 【Price】【цена】【Datasheet PDF】USA

Figure 6 shows the circuit of a analog-to-digital converter ADC When the user wants to start this multimedia system, he should reset the MCU program first and then launch the PC software application.

Therefore we implemented a sample buffer of size bytes to store the signal samples and reuse the buffer continuously. Figure 5 shows the circuit of the pre-amplifier of the microphone voice input. There are 7 different commands the PC can send to the microcontroller.

I am sure that our project has the commercial value. The voice output signal is the square of the voice input signal.

However, there is only 2K SRAM memory in the microcontroller and the echo effect occupies bytes. In fact, multimedia system has existed for a long time. The application passes the clip filename as a command line argument to the player. However, after we built the circuit, we found that its data transmission is not reliable since the receiver received many data packets from other teams using the same transmitter and there was much interference.

Posted in Sex