A DAC is a Digital to Analog Converter.

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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
48 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
41 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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2answers
44 views

Is there a PIC MCU with an integrated DAC in it? [closed]

I look for a PIC microcontroller with a digital to analog converter in it but I can't found one, if there is one please tell me, thank you.
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1answer
247 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
63 views

ADC/DAC module with TCP/IP communication

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
112 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
30 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
146 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 ...
7
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1answer
338 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
82 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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23 views

Designing a DAQ which need not be interfaced with a PC

I am trying to implement a efficient high accuracy control for locking a laser. I am trying to avoid purchasing expensive analog components like analog PID servo, filters etc. I figured maybe I could ...
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1answer
37 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
81 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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0answers
44 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
36 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
37 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
29 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 ...
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3answers
56 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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0answers
43 views

Voltage not correct for circuit

simulate this circuit – Schematic created using CircuitLab Left side of chip is all inputs. I have two of these circuits (IC9 and IC10) the IC10 circuit is working fine but this one i ...
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1answer
62 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 ...
3
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1answer
43 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
38 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
67 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
61 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 ...
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28 views

Full scale range(FSR) of DAC

I have to implement quantizer block of DAC with resolution( effective number of bits) of 8 in MATLAB. However, the full scale range(FSR) of the converter isn't provided to me. Does anyone have any ...
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1answer
149 views

Designing audio player - low-pass filter, DAC

I'm building audio (wave) player on some microcontroller. I will have external 16-bit DAC and I wonder if that's enough? I mean, is low-pass filter really needed? (I know what it does and why you ...
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1answer
93 views

Tactics/Devices to achieve huge, fast and low latency DAC output from a PC controller [closed]

I have a few different projects in mind that all have the same problem to be solved. They revolve around an application where a computer processes values that need to be sent out to real world ...
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1answer
55 views

Changing DAC output how far, how fast, how to tell

If I had say a 100MHz DAC I can't just change the output from 0V to max V in 10ns, at least I think I remember you can't do that in real life. How do you understand what you can do from a datasheet? ...
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1answer
176 views

PWM (Pulse Width Modulation) vs DAC (Digital Analog Convertor)

I am working on a project where I take over the control of a Nintendo 3DS Touch Screen. The touch screen is a 4 pin system. I have it all wired up and working, however I cannot get the screen to ...
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1answer
60 views

R2R DAC in reverse

Knowing how voltage dividers work, this probably isn't possible. But, is there a way to run an audio signal back through an R2R arrangement and get 8bit digital signals back out without complex ...
2
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1answer
84 views

digital bandpass filter with parallel inputs

I have a high speed ADC connected to an FPGA. The ADC is designed such that you get 16 samples every FPGA clock cycle (that's samples, not bits). The 16 samples are from a single ADC input channel, ...
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68 views

Direction of DAC output current

I am confused about the I/V Conversion at the output of this DAC (PCM1798) In the electrical characteristics section, a dc output current (called "Center Current") of -3.5 mA is given, for zero ...
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83 views

DAC as precision voltage reference

I'm thinking of using a DAC as a precision voltage reference. I want 0-30V and would be happy with 12bit resolution although If i can get more I'd go for it. My question really resolves around what ...
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1answer
36 views

DAC circuit and ampli op

I'm looking for a DAC in order to convert a digital signal of 8 bits into an analog signal of 0 to 5 volts with an ideal precision of 1 LSB. It is the first time that I look for a DAC and I'm not an ...
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1answer
90 views

Worst case error for a DAC

I am trying to estimate the worst case absolute error for a DAC (the example I'm taking is MAXIM MX7524). I'm getting familiar with the concepts of INL, DNL,... But how would you estimate the worst ...
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2answers
263 views

Smoothing a High Current PWM

I am using a MOSFET to control the average voltage to a device by varying the duty cycle to the base as shown in the diagram below. My question is what is the best circuit to use in the "filter box" ...
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2answers
165 views

Extreme long settling time (6 ms) of the DAC on STM32F4?

I encounter a problem with the DAC on both STM32F4/STM32F429 Discovery boards and hope someone can give me a hint. The DAC (using DMA with output buffer enabled) generates a FSK controlling signal ...
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2answers
147 views

High Precision ADC/DAC Circuit Feedback

This is my first proper circuit I've designed and I'm after some advice. I need a 16 bit DAC, output 0-5V and I need to measure the resistance of a thermistor to 0.1mk accuracy. At the moment, I am ...
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1answer
82 views

Converting digital signal to analog

What is simplest way to convert digital signal 1 0 0 1 0 0 1 0 0 (i.e. 1/3 of time its ON and 2/3 of time its off) into sinusoidal signal of same frequency, which can vary from 3 KHz to 6 MHz?
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77 views

DAC quantization noise on DC output

Does the output of a DAC have quantization noise when outputting a DC voltage value? It seems to me that it will not as long as the DC value does not fall between two output levels of the DAC. All ...
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1answer
107 views

Downscale a 0 - 5volt supply to a millivolt range

I am currently at keen novice stage in my understanding of electronics so i hope my question makes sense! I have a project I am working on that requires the simulation of a sensor. The sensor is ...
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1answer
123 views

I2S interface using LPC2138

In my application, I am using LPC2138 controller and TI's TLV320DAC3100 DAC with built in amplifier to interface audio data. To implement I2S interface using SPI, some extra hardware circuitry needed ...
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49 views

Audio interface using LPC2138

I am planning to implement Voice guide/Assistant using TLV320DAC3100 DAC and LPC2138 controller. Above DAC has I2S (Inter IC Sound) interface. Unfortunately,LPC2138 is not I2S supported. So, Is there ...
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3answers
76 views

4-20mA Loop powered DAC

I was selecting a DAC for HART network and in the process I came across two terminology. 12-/16-Bit, Serial Input, 4 mA to 20 mA, Current Source DAC AD5420 and 16-Bit, Serial Input,Loop-Powered, 4 ...
6
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1answer
155 views

DAC datasheet term confusion: FS-1LSB

In the Digital to analog converter HP16BME, I keep stumbling into " +FS - 1LSB " and I'm not sure what it means. I mean, I still don't know the exact scale value because I don't know what FS stands ...
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1answer
59 views

Controller built-in vs external DAC

I am using STM33F in my application, it has 12 Bit DAC. For one of the audio codec module in same application, stereo DAC with inbuilt amp needs to be implemented (IC TLV320DAC3100). Above codec ...
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2answers
78 views

Which GND pin do I use on a DAQ?

I'm trying to use an absolute shaft encoder with an NI MyDAQ. I'm powering the encoder using the 5VDC pin on the DAQ. Does the ground pin--AGND vs. DGND--I connect the shaft encoder to matter? I ...
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117 views

SPI Communication fails with ISO7241C but works with ISO7641FC, same circuit?

Objective: To interface DAC161S997, with Microcontroller C8051F350 through ISO7641FC using SPI Protocol, Which works fine and DAC output is achievable. Now here is the problem, I have changed ...
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1answer
116 views

Choosing an Audio D/A converter for I2S digital audio based on 32fs

I'm hoping someone can either verify or clarify my understanding of interfacing an Audio D/A converter to a device that sends audio over I2S. I have an Audio Codec chip, the VS1063A (Datasheet), ...