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Questions tagged [dac]

A DAC is a Digital to Analog Converter.

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60 views

AD7849 is it burned?

I made a terrible mistake connecting -15VDC to the pin 18 of AD7849 instead of pin 17 and powered it up for a minute until i understood the problem.It was without the protection diode for power supply ...
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0answers
66 views

Connect DAC 12 bit (STM32F429) to audio line in of class D amplifier

Is it possible to connect the 12 bit DAC of STM32F429 directly to the audio in of XH-M189 amplifier module (for example)? What precautions must be taken into account? The connection of DAC to XH-M189 ...
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1answer
46 views

Is it possible to use one DAC to process signals from different channels that are delayed at different times?=

So I have a small project where I need to delay multiple signals that come out from a microcontroller. The signals are around 40kHz, have the same attributes, except that they are delayed by a few ...
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1answer
23 views

PCM270xC USB audio DAC, power modes and THD

I am designing a USB DAC for headphone use, and planing to use a TI PCM270xC IC. There are two power modes: (USB) bus powered, and self powered. What I'm trying to understand is how does the power ...
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0answers
42 views

I2S DAC Volume Control

First of all, let me preface this with the fact that I'm not an EE -- I'm a hobbyist with some experience and a background in software development. I'm trying to use a TI PCM5102A Audio DAC with a ...
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2answers
75 views

Hardware audio mixing [closed]

I'm having a hard time trying to understand some basic sound engineering concepts. From https://en.wikipedia.org/wiki/Original_Chip_Set#Paula: Paula has four DMA-driven 8-bit PCM sample sound ...
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1answer
41 views

Evaluation A/D and D/A converter

If I need to read and write data over TRRS to and from headphone (i.e. I read from standard (iphone/galaxy) headphone mic. and write to standard headphone earphones). This is a schema of what I want ...
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1answer
49 views

Arduino and DAC

I have programmed an Arduino to control a DAC, generated signal control the current of an LED via a LT1206. Whenever I plug in the power, before Arduino starts, the LED starts to blink because it ...
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1answer
56 views

SAMD21 DAC example

beginner here in need for starting directions. I have SAMD21 Xplained Pro Board. I would like to produce DC DAC output, based on 8 bits on the input. Range of my DC output values should be around ...
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0answers
25 views

DAC and LC filter bandpass settling time

I am hoping someone can point me in the right direction. Is there a relationship between purity of a DAC output and the bandwidth of a band-pass LC filter? My intuition tells me that if the ...
1
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1answer
91 views

What's the purpose of using PNP transistors on I2S bus?

What could be the reason of using these 3 PNP transistors on I2S bus (LRCK, BCK and DATA pins)? The DAC used in this schematic is PCM5102. I know for sure that this DAC would work without these ...
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2answers
111 views

Amplify my 3.3V DAC signal to 220V

In one of my projects I need to generate different kind of 220V amplitude waveform signals in order to send commands to a heater using the pilot wire protocol. Here are the needed waveforms: Is there ...
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1answer
58 views

How do I remove the offset from the DAC output and change the range?

This DAC has an output range of 1-3 volts. Here's the datasheet: Datasheet I'm getting pulses with different amplitudes, frequencies, duty cycles and widths varying from 0.2 ms to 2 s from the DAC. ...
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1answer
63 views

How does this serial input DAC work?

This is the datasheet for 6379A: datasheet I looked at the timing charts, but I’m still having trouble figuring out how the IC treats the serial input. Apparently, SI is sampled at positive clock ...
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0answers
37 views

Do FFT to characterize dynamic firgure of ADC (SNDR,SFDR)?

I am designing ADC in 180nm and it's time to characterize dynamic figure such as SNDR(SINAD). The test signal input is a 1kHz sine wave, the sampling rate of ADC is 100kS/s. After reconstructing from ...
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2answers
103 views

16 bit DAC microcontroller

I'm currently working on a audio project where I need to play a 16 bit depth signal with a speaker. Right now I'm using an atmega328 for prototyping, two 8 bit shift registers (controlled by the MCU) ...
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1answer
36 views

Why does DAC INL follow a pattern, with peaks repeating at certain specific intervals?

INL curves seem to have relation with "digital" effects from the codes,like a major carry transition. Could someone help me understand an electrical or rather an analog, explanation for this occurance....
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50 views

Using a single channel on a 2 channel DAC + Amplifier

I am planning to use an external DAC + amplifier combo to output mono sound from my microcontoller. The ouput from the amplifier would be connected to a single speaker ...
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1answer
58 views

Output impedance for microcontroller minimum 5kOhm

So I'm looking into the stm32f469 series of chips (datasheet here), and see if I can play good audio with one with the build in DAC. To my knowledge, the built-in ones on chips usually aren't that ...
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0answers
39 views

Converting an SPI configuration for msp430 to msp432 IAR Workbench

I have a spi configuration code for a msp430 and DAC161S997 but i am trying to use the DAC with my ...
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0answers
71 views

Controlling DAC161S997 via SPI

I am using msp-exp432p4111 devalopment board and trying to use DAC161S997 with it.The main goal is creating a ...
3
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1answer
79 views

What limits native color depth of cheaper LCD panels?

Many cheaper LCD panels have native color depth of 6 bits per channel. This makes manufacturers of monitors implement dithering to avoid banding. But what actually limits the panels in their color ...
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3answers
98 views

2-bit DAC from TTL logic using 2 MCU outputs

Basically I am trying to make a 2-bit DAC that can interface to an external device via one signal wire. I want to create a 3-step signal that can be ~0V, 2.5V, and ~5V. For starters, I tried using ...
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1answer
46 views

Cheap USB controlled DC voltage [closed]

Right now I'm using National Instruments DAQ boards, but I need to put together a few devices that require software control of a DC voltage in the 0-5v range. Update rate can be less than 1 Hz and 8 ...
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1answer
70 views

How to convert from %FSR to LSB (DAC)?

If a DAC has a gain error of +/- 0.1 %FSR and an Offset Error of +/- 1 mV. Operating range 2.7V-5.5V with a reference Voltage of 4.096 V. How would I convert that +/- 0.1 %FSR to LSB? The datasheet ...
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1answer
64 views

Can someone explain me the role of MOSFET in this circuit ? Are these MOSFET working as a switch here?

This Image is taken from the PIC16(L)F15356/75/76/85/86 MCU datasheet datasheet- go to page number 286 for more details
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1answer
59 views

DAC negative bias reference voltage

I'm using TI's 18-bit DAC9881 and need the output to go a little below 0Volts in order to account for offset voltages of following Op-Amp stages. The DAC allows to provide a "low reference" between -...
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0answers
46 views

SPI DAC not changing from initial value

I've written a test program which outputs 255 to the TLV5606 DAC via SPI, all which works as expected. I then tried extending the program to update the value to 512, after a 5 second delay. ...
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0answers
56 views

Frequency response of linear DDS chirp

I am performing a linear frequency sweep from 80 MHz to 120 MHz in 26.84 ms with the AD9910 direct digital synthesiser. I experience that the output amplitude is not constant (see Figure 1). With my ...
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2answers
100 views

Choosing correct DAC: DNL and INL

let me know what I state below is correct or not. Regarding the DNL and INL of a DAC, DNL is the error difference between actual step width and ideal value (1 LSB). INL is the deviation of actual ...
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1answer
84 views

TLV5606 interfacing

Has anyone had any experience interfacing the TLV5606 DAC with a microcontroller (via SPI)? I'm having trouble getting any output from the DAC, which I suspect is down to my code. Does anyone have ...
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2answers
171 views

Communicating with an SPI DAC

I'm trying to interface the TLV5606 with an mbed via SPI. The connections I've made are as follows: Note: mbed is powered from same 5V supply. I modified the mbed SPI helloworld prorgam: ...
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5answers
3k views

Why can't this LM324 op amp reproduce a signal above a certain frequency?

There seems to be no shortage of circuits like this that attempt to use an R2R as a DAC and an op. amp. as an output buffer. These make sense to me so I decided to try and construct one. I ...
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1answer
25 views

TLV5606 update frequency

I'll be using the TLV5606 to produce a sine wave. Control is via SPI. Ideally, I'd like to "update" the voltage 2000/sec. Is this too fast for the IC? I'm struggling to understand the datasheet. What ...
4
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1answer
231 views

How Significant is VGA Impedance Matching?

I've seen a multitude of different resistor DAC solutions for a VGA signal, however they almost always have an impedance of >200 ohms per color, e.g. when I've been lead to believe that we want to ...
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1answer
97 views

Benifit of Delta Sigma DACs

I've researched much about the delta sigma ADC and understand to some extent its workings. The delta sigma modulation in the ADC allows for increasing the ENOB by increasing the SNR through noise ...
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2answers
32 views

Does LRCK have to oscillate in an I2S system?

I'm working on a audio function generator using the PCM 1795 DAC. I only need a single output channel for my design. Can I just pull LRCK low or high permanently for the sake of maintaining design ...
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0answers
30 views

MCP4922 buffer feature

I'm using the MCP4922 as a dac with some different python programs. I am using this python package which has a setVoltage_buffered(channel, value) command. To quote ...
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1answer
52 views

Motor control signal resolution

I'm working on a project which requires the control of a motor via a +/-10v control signal (which will be fed into an amplifier). In theory any motor can be used, although it should be attached to a ...
1
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1answer
54 views

REF02 not working - 4 channel 5v DAC circuit, star gnd connection, stripboard layout

I've connected my circuit as in the diagram, with a 15V PSU powering it (both amps are connected the same way) - but the DAC seems to be drawing too much current for the REF02 to handle, even though p....
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1answer
90 views

Best way to attenuate R2R DAC output?

Given an N-bit R2R DAC, with input voltages of e.g. 0-3.3 volts, what is the the best way (signal integrity and quality maintained) to attenuate its output voltage to a range e.g. 0-.7 volts for a VGA ...
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0answers
39 views

113kHz Analog signal generator circuit operation

The title doesn't allow for detailed questions so I will try to do that here. I have a device that needs a 113kHz square wave at around 10 volts to operate. Currently, the circuit I am using takes a ...
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0answers
28 views

Amplifying DAC output with common-emitter configuration

In my current project setup I generate audio signals from my MCU's internal DAC. These audio signals are transferred to a speaker box with an internal amplifier via phone jack. To make the whole ...
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1answer
236 views

How to connect STM32 with DAC?

I have to do a project for my Uni, where one of the requirements is to connect DAC (AD5721 - Datasheet) with STM32F405RGT6 (Datasheet - package : LQFP64). This is what I have so far (DAC connected ...
3
votes
1answer
421 views

How does a Delta-Sigma DAC work?

I have looked at how the Sigma-Delta ADC works and I understand it. However, it seems to me that there is not a lot of literature about the Sigma-Delta DAC. I want to build a model of it in Simulink....
1
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1answer
48 views

BU2505FV current capability

I plan to use the BU2505FV Digital Analogic Converter in my design. After some simulations on LTSpice I've concluded that each of the analog output will consume 700µA maximum. Is this component able ...
2
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2answers
116 views

Scaling analog sensor output (0.4V to 2.7V) to full dynamic of ADC (Vref 3.3V)

I have a question regarding the scaling of analog sensor output signal. The goal is to connect a Sharp GP2Y0A02YK0F distance sensor to a Raspberry Pi 3 B. The sensor can be run off the 5V rail of the ...
1
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1answer
53 views

Connect DAC IC to current sinking controller

I want to supply a 0-5V signal to this process controller using the DAC8555. The DAC8555 datasheet states: Each output buffer amplifier is capable of [...] driving a load of 2kΩ in parallel with ...
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2answers
133 views

Draw a circuit with a voltage divider, two comparator ICs, LDR sensors

I got this last question to practice for my exam and I got stuck. The question is draw a circuit with a voltage divider circuit, two Comparator ICs, LDR(Light Dependent Resistor) sensor Outputs: ...
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1answer
149 views

How to reconstruct input signal by using DAC?

I am working on a project in which - I have to continuously monitor the the ADC input on a microcontroller(STM32F407) and check if the value crosses a certain threshold. If the value crosses the ...