A DAC is a Digital to Analog Converter.

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Buffered Kelvin-Varley divider in AD7849

In ADI's data sheet of AD7849, page 11, it gives the internal structure as below: It uses a so called 'Buffered Kelvin-Varley Divider'. But i'm not very clear with it's explanation To prevent ...
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3answers
69 views

Convert PWM to Analog using a DAC chip in order to emulate a Potentiometer for audio

I'm trying to control audio level/gain (from line or amplified signal) using an Arduino. I do not want to use SPI, for this project I can only use the PWM outputs, thus I do not want to use a digital ...
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13 views

Unable to create a desired periodic signal with Arduino Mega 2560 and DAC0808 [migrated]

I write the code to produce the periodic signal by using arduino and DAC0808 where i turn on the respectively pins of PORTA and by using a logic in iterative manner, i created the periodic signal. But ...
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2answers
401 views

Using a MCU's UART as DAC

Many simple MCUs do not provide DACs despite having PWM output. For low clock frequencies like 8MHz, PWM does provide very poor quality if used for audio purposes. E.g., TI mentions in application ...
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1answer
23 views

Significance of Negative reference voltage in DAC0808 Chip

In DAC0808, positive reference voltage is used to set the maximum output current through that chip and the value of the output current can be changed by appropriately setting the bits. Normally, in ...
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1answer
36 views

What is the purpose of masking the LFSR value in STM32's noise generation?

I read on section 14.3.8 of the STM32F4 reference manual that you can mask the LFSR output value partially or totally. At first I thought that it was used to change the pseudo random pattern (...
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34 views

Connecting a Virtex 6 FPGA to a high speed DAC

I'm a university student who's relatively new to the FPGA so please forgive me if something's missing here. I've recently started worked with the Xilinx ML605 FPGA board and have tested it with some ...
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1answer
64 views

stm32 audio levels

I'm using an STM32F746G for exploring embedded audio DSP. My experiments sound great in headphones but when I connect the audio output to external amplifiers, the signal level is low and there's a ...
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3answers
141 views

Output impedance of the current output DAC

As known there are two types DAC using R-2R ladder. One is voltage output and another is current output. The voltage output type has a constant output impedance which equal to R. The current output ...
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69 views

12-bit output to +/- 10v

Suppose we have a signed 12-bit output which is capable of representing both positive and negative numbers, how can this be converted to a +/- 10v signal using DACs, op-amps, etc. For example, 1100 ...
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16 views

Choosing the DDS IC for an ADPLL

I am trying to make a ADPLL with a centre frequency of 32 KHz .The input frequency is a sine wave. I am using the ADPLL for FM Demodulation and I need high frequency resolution with atleast 14 bit ...
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44 views

Differential to Single-ended conversion clipping issue

I am attempting to convert the differential output of a DAC to a single-ended signal using the following circuit from a TI datasheet: The signals going into this amplifier look like this: And ...
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1answer
48 views

Can't get STM32 DAC to output anything

I'm trying to make a generic STM32F103 board output a sawtooth wave on DAC channel 1 but I'm getting nothing. The code is very straightforward and I've endlessly studied the datasheet, Google, various ...
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4answers
142 views

Amplify 0 to 3.3V input to +/-3.3V

I'm working on modifying a board, while going through its schematic design I came across a section where a DAC output into the range of [0, +3.3V], which is then supposedly gained to +/-3.3V range, ...
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1answer
69 views

STM32 : reset the I2S DMA address pointer

For my application I have a DAC communicating with an STM32F4 through I2S. On the microcontroller's side, informations are send to the DAC through a DMA stream, with a circular buffer. On an external ...
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69 views

BLDC Motor : Control Speed digitally using Microcontroller

I am stuck with a logic to control the speed of BLDC Motor via Microcotroller. I have a BLDC Motor with Electronic fitted. It requires following signal to drive : +24v 0v or GND Enable ...
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1answer
70 views

How to use an 2-axis accelerometer as a potentiometer? [closed]

I've got a couple of Memsic 2125 accelerometers around and wanted to try to use one of them to replace a pair of potentiometers in a circuit (x axis replaces pot A, y axis replaces pot B). How would ...
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3answers
89 views

wav file audio samples are signed, how does DAC deal with signed numbers when it does not have negative supply?

I was looking into wav audio file specification, they may hold the pulse coded modulation data as signed our unsigned integers as well as floating point values. How does a DAC deal with signed ...
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1answer
80 views

Not enough digital outputs for SPI slave select lines (CS#)

I have a microcontroller with only 4 digital outputs available and 4 digital inputs. The problem is that I need to communicate with at least 4 SPI devices (ADC's and DAC's). 4 SPI devices means 2 ...
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1answer
47 views

DAC Output to 4-20mA [duplicate]

I have a Microcontroller with a DAC output of 0-3.3V. What external circuitry can I use to convert it into a 4-20mA current transmitter.
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1answer
61 views

Digital to Analog conversion in Multisim

Here is schematic for Analog to Digital conversion: Here are two Digital to Analog converters in Multisim: Which one should I use? I want to connect it at output of ADC to get original sine wave....
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4answers
161 views

Startup transient when using a bipolar opamp as a DAC voltage reference

I have a mixed-signal circuit, with the audio side using a \$\pm15V\$ supply, and the MCU and DACs using a \$3.3V\$ supply. The MCU's internal DAC and two external DACs provide control signals for the ...
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2answers
144 views

Debugging an MCU short circuit

I have a board with an STM32F103VGT6 MCU. Yesterday, the MCU worked fine, I had just gotten semihosting working, LED blinking, played around getting a timer running and so on. I then decided to try ...
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63 views

A question on DAC and sampling

A traducer's analog output is generated by its DAC as seen in the below plots. The plots are from the same data with increasing zoom. Plots obtained by using a DAQ. It seems like the DAC outputs 3 ...
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74 views

Question about the need of ADC and DAC converter

why we want to convert digital signal to analog signal back into digital? between electronics device, why would we want to do that? Is there any advantage of transmitting analog signal through a cable ...
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44 views

How to control chip select and Load DAC signals for a DAC chip?

I have a DAC7643 (Texas Instruments) - 16-Bit, Dual Voltage Output DIGITAL-TO-ANALOG CONVERTER I have been mostly unsuccessful with controlling the CS and LDAC signals. I have simulated a circuit ...
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1answer
22 views

Pin configuration for DAC (AD767KNZ)

I want the DAC(AD767KNZ) to output a signal 0V to 5V. What should I connect to VCC and VEE? DATASHEET : http://docs-europe.electrocomponents.com/webdocs/10b5/0900766b810b5166.pdf Thanks,
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437 views

Improving PWM by using comparison to LFSR instead of counter

PWM is a very powerful technique to simulate an analog output from a microcontroller, programmable logic or any other digital environment. This can be used to drive LEDs, motors and speakers, etc... ...
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1answer
487 views

Reason for brief spike in op amp output when crossing 0V?

Does anyone recognize this spike in the output of an op amp when the signal crosses 0V? It spikes up when crossing up and down when crossing down. In one of the EEVBlog videos, Dave pointed to ...
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Is it possible to combine two 8 bits DACs together to create a 16 bit DAC, one byte of the 16 bit word shall be sent to each of them

For two DACs, one being sent D0-D7 and the other being sent D8-D15, with power supply being 5V, if 5V is added to output of 2nd DAC and then the two DAC outputs are summed, should result in a 16 bit ...
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2answers
80 views

Feeding two DACs with same input

Can I feed same digital signal to two DACs and take the average of the outputs of two DACs. What precautions should be taken?
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2answers
114 views

Generating 8 analog signals from microcontroller [closed]

I want to generate 8 analog independent signals from a microcontroller, such as a BeagleBone or STM32. In my research, I found that I can use an external multi-channel DAC and interface it with the ...
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1answer
45 views

DAC/ADC lines length matching

I am using DAC3484(dac) and xc7k160t-1ffg676(fpga) in my design. DAC is interfaced to FPGA. DAC data rate is 153.6MHZ. DAC data lines should be length matched within some tolerance. How to decide that ...
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3answers
104 views

Translating 16-bit digital counts on a CD to voltage on the output RCA connector

CDs use 16-bit signed integers to represent each sample. So each sample is an integer between -2^15 and 2^15-1. A typical consumer CD player has two RCA outputs coming out the back of it, one for ...
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62 views

Bipolar output from DAC with unipolar supplies

I want to use a unipolar 12-bit DAC (MCP4725) as a function generator with bipolar output (from -2.5 to +2.5V). Problem is, I only have two supplies of +5V and +12V referenced to the same ground, so ...
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1answer
109 views

BPSK modulator with DDS on FPGA

I was developing a BPSK modulator with an AD9852. Since AD doesn't seem to offer any way to functionally simulate their DDS ICs, suddenly i see myself in the need to change for a FPGA architecture. I ...
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1answer
84 views

Input/output for buck-boost converter controller implemented with FPGA

I am trying to implement a voltage controller for a buck-boost converter using FPGA. The control method I'm trying to use is in this paper: www.engr.iupui.edu/~aizadian/index_files/Papers/C-28.pdf ...
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174 views

When shall a current output DAC be used?

It seems to me that voltage output DAC can do all the jobs of a current output DAC. When shall a current output DAC be used(superior than voltage output DAC)?
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49 views

using an AduC841 microcontroller. memory read shows pointer not object pointed to

I am using an AduC841 microcontroller programed using assembly language(8051). when using MOVX commands to read/write from internal XRAM to DAC,my oscilloscope shows the value of the DTPR rather than ...
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328 views

8-Bit stereo audio R-2R DAC, is this a right way to do it?

I am new to electrical engineering and the first project I would like to do is making a digital to analog audioconverter. I've found out that a good way to do this is to use an R-2R structure for the ...
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2answers
121 views

ADC/DAC module with TCP/IP communication [closed]

I have a project: conception and realization of a module that converts Analog to digital signals (A/D converter) and digital to analog signals (D/A converter). To communicate with this module, I will ...
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3answers
442 views

Optocouplers with non-inverting logic

Here is the setup: I'm using the Arduino Mega's SPI functionality to send signals to multiple DACs. For digital isolation, I am considering the HCPL-2631 or the ACPL-064L. The problem with these two ...
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80 views

WT588D-U use of DAC audio output

U When I use the PMW output with a speaker like this, all is good: http://www.instructables.com/id/WT588D-Standalone-Arduino-sound-player/?ALLSTEPS I want to test DAC output so I did it like this ...
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2answers
168 views

Building a VGA circuit

I am building an 8 bit VGA circuit and have 3 choices. One is to use a simple resistor network to convert digital to analog. The second is to use an op-amp. The third way to do this is to use a device ...
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1answer
479 views

PCB microcontroller layout in a mixed-signal system

This is a direct continuation of this question. So here's my layout, what do you think about the microcontroller side? EDIT: based on Armandas' answer, I'm now under the impression that the ...
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135 views

What could be the source of this sine wave distortion, visible as equally spaced lines in FFT?

I have an MCU controlling a 16bit DAC via SPI (and an additional LDAC output, which triggers the update of the DAC output). The MCU has a precalculated 1120Hz sine wave in a 364-byte long buffer (all ...
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41 views

MCP4822 not giving output as desired

I have two MCP 4822 DACs with a dspic33fj128mc804. The initialization of both the DACs is getting done as required. However, when I try to change the values to be written on the DAC they don't get ...
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2answers
152 views

I2C communication with DAC

I am trying to use a DAC8571 (datasheet) and I'm trying to set up a communication between this convertor and an Arduino Mega via I2C. The communication between the Arduino and my computer is done ...
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1answer
141 views

Confusion about serial operation of CS4344 DAC, what is MCLK?

After repeatedly reading through the datasheet of the CS4344, I am having trouble fully understanding the purpose of the MCLK pin in serial operation. In my research I have found that MCLK pins are ...