A DAC is a Digital to Analog Converter.

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70 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
71 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
39 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.
0
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1answer
18 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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3answers
119 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
85 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 ...
0
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1answer
60 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 ...
-1
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3answers
59 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
35 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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0answers
43 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 ...
3
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5answers
424 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... ...
9
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1answer
454 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
78 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
103 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
41 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 ...
2
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3answers
95 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 ...
0
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3answers
50 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 ...
0
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1answer
89 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
73 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
111 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 ...
8
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1answer
289 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
98 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
289 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
54 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
156 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
436 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
127 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 ...
0
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1answer
40 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
117 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
111 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
45 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
39 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
37 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
111 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
63 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
57 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 ...
0
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1answer
48 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 ...
0
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1answer
82 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
94 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 ...
0
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1answer
222 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 ...
0
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1answer
58 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? ...
0
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1answer
240 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
70 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
95 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, ...
0
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2answers
84 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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1answer
101 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 ...
0
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1answer
40 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 ...