A DAC is a Digital to Analog Converter.

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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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0answers
47 views

Power an autonomous drone by answering this question :) [closed]

http://www.schematics.com/project/pixhawk-tractor-wiring-28856/ https://pixhawk.org/modules/pixhawk#schematics While an Arduino Pro mini controlling a DAC has been used to do something similar in ...
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1answer
36 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
37 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
133 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
39 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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66 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
66 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
81 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
77 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
43 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
33 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 ...
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4answers
148 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
112 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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1answer
61 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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3answers
68 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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0answers
40 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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67 views

Voltage to Current converting with LM675 Power Op Amp from TI

This is the circuit that I have in mind. The op amp receives voltage signal from a buffered DAC (its maximum load is 50 kOhm) and output a current with frequency of 1 kHz and amplitude of 1 A. The ...
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5answers
428 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
466 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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6answers
3k views

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
79 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
105 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 ...
0
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1answer
42 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
96 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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3answers
57 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
101 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 ...
0
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1answer
78 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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3answers
135 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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1answer
45 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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1answer
310 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
107 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 ...
0
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3answers
354 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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1answer
59 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
162 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
451 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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1answer
129 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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1answer
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 ...
0
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2answers
129 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 ...
0
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1answer
122 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 ...
3
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1answer
46 views

How can I mitigate SNR or THD for audio codecs?

During my studies at university, we didn't go too in depth about Signal to Noise ratios (SNR) and Total Harmonic Distortions (THD). I've been trying to work with audio codecs for some time and I only ...
2
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1answer
40 views

Altering reference voltage of DAC

I'm making a circuit which requires an adjustable voltage gain (0 - 1). I thought of using a multiplying DAC (R-2R type) with input voltage connected to its Vref pin. The input code to the DAC shall ...
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1answer
39 views

Interface 8051 DC motor using a DAC

I want to interface 8051 to a double gear box kit with comes with a dc motor. The motor spec is : "3-6 volts and draws up to a few amps" The DAC is MAXIM 512 : And as per the data sheet, this is what ...
2
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3answers
121 views

Sampling rate for PID control to balance an inverted pendulum using 8051 - AT89c51rc2

I want to control a dc motor(to balance an inverted ;endulum) I want to sample the input from sensors(e.g.: ADXL345) and convert it to digital using a DAC. The maximum output data rate(ODR) for ...
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1answer
64 views

How to get electronically controlled multiple individual voltage outputs from a single source?

I am planning to make a digital control board which can draw a DC Voltage of the order of say 12-15 Volt, from a single source and give multiple number ( approximate #100 ) of voltage lines of ...
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1answer
59 views

Setting up the “Basic Bipolar Output Operation” connection on a DAC08 chip

I have an 8-bit waveform description coming from an FPGA into the DAC, and I want to read the analog output on an oscilloscope. I figured I should implement this setup found in page 11 of the data ...
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1answer
50 views

Sampling rate in dacs

I am using a DAC form analogous devices viz - AD565A. Now, according to Nyquist theorem the minimal sampling rate for a decent reconstruction of a signal twice the rate of its highest frequency ...
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1answer
92 views

Microchip PIC24 DAC output too low

I'm using explorer 16 evaluation with PIC24FJ256GB410 Module. And I am trying to work with the internal DAC. My code : ...
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1answer
108 views

DAC Signal to AC?

I am producing a sine wave signal from STM32F3 through DAC. but since micro-controllers can not produce negative output so my output limits to positive half only. but in my application i need signal ...