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Questions tagged [dac]

A DAC is a Digital to Analog Converter.

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17 views

Allowing different inputs without needing to alter gain every time; a situation for a pre-amp?

The goal I am attempting to make a small diy bookshelf speaker system using 2 16ohm, 25 watt speakers and a 2x25 watt class d amplifier board. If it matters, the amplifier board is a class d amplifier....
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1answer
38 views

Operating AD5780 EVAL Board Via MicroController

OK, so thanks in advance because I am new here. I am reading the AD57XX drivers here https://wiki.analog.com/resources/tools-software/uc-drivers/renesas/ad5780 and am struggling to understand how to ...
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10 views

Single Ended DAC to Differential Input Modulator

I'm trying to drive a differential input IQ modulator (LT5571) with a single ended DAC (MCP4912) for modulation of a narrow band signal (~10kHz max). Because of the nature of the low frequency ...
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45 views

Understanding Ports on DAC

So I am working with this DAC and I am trying to attach reference voltages and outputs, but I am confused. Looking at this image of the board, what is the connection to VOUT ? How do I connect to ...
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42 views

Effects of a voltage divider on an audio DAC

Background: I'm planning on using a TI TS5A22364 SPDT Switch with Negative Signaling to connect AGND to the Left and Right Channels of the TI PCM5102A Audio DAC when the DAC is powered down as an ...
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2answers
35 views

DAC offset error vs. output low voltage

I am looking at the datasheet for the MCP4725 DAC and trying to find the minimum voltage the DAC will output. In other words, when my code tells the DAC to output 0v, what will the output be? There ...
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2answers
56 views

Analogue signal generation: Which is better Standalone or PWM DAC?

Most controller/processor come with PWM output and integrated standalone DAC module.... My need is to generate 50/60Hz analog signal for testing purpose! Which would be the good choice PWM DAC or ...
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43 views

Change range of data acquisition system

I have a DAQ with many inputs that can measure within +-10 V, and I want to go up to +-30 V. Using a resistor voltage divider could be an option, but this lowers the input impedance. I would prefer ...
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39 views

how to connect micro to µPD6379A (NEC Dac IC)

We want to use µPD6379A in our project. after a lot of search we've found no data (code example or schematic hint) about using it on internet. Can anyone guide us on using that IC. Any advice would be ...
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1answer
29 views

Can I use op-amp together with PCM5102A?

Is it possible to use op-amp with PCM5102A? In my application the load is much lower than 10k, so as a result I have much lower Vrms than it's defined in the data-sheet (2.1V). Maybe it's possible to ...
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30 views

FPGA VCU108 FMC Clock

For a project at work, we are attempting to create sinusoidal signals ranging up to 2 GHz using DDS implemented on an FPGA and DAC. Our current hardware consists of a VCU108 FPGA board from Xilinx ...
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33 views

External DACs to 3.5mm jack attached to computer speakers

I have 5 external DACs and 5 Speakers that are being powered independently. The DACs are connected to an Nucleo-f446re microcontroller where will be receiving their data from. For the speakers I am ...
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1answer
78 views

PCM5102A: analog output level not what I expected?

I cannot achieve a 2.1 Vrms mentioned in their datasheet (pages 4 and 9). I can only output 1.04Vrms from the 1kHz source. Do I measure it wrong or this is what I should expect? Or maybe I get such ...
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1answer
33 views

PCM5102A in 1.8V mode. Separate 0.1 and 10uF caps for DVDD an LDOO?

I found in the datasheet (33 page, 11.5.1) that when using PCM5102A in 1.8V mode, DVDD and LDOO should be both connected to external 1.8V. What's not clear to me is if I still have to put separate 0.1 ...
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38 views

Converting 2.1V RMS DAC output to instrument level 6.35mm jack

I'm not quite sure how level and impedance matching works so I am hoping for an illuminating answer! I'm generating audio with a PCM5102A DAC. The datasheet of the chip specifies a 2.1V RMS output ...
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1answer
47 views

Digital to Analog (DAC) design with MOS transistors

I am looking for a DAC design wıth NMOS and PMOS transistors as a part of a project, most of the DAC circuits that I found were builted with R-2R or with capacitors. But I need a design with MOS ...
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23 views

Load vs LDAC pins

Alright, so I'm using a TLV5628 Octal 8 bit DAC with my stm32f4-Nucleo and I'm kind of confused about the difference between LDAC and Load. I am also trying to figure out the clock rate and I might ...
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66 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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73 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
48 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
30 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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107 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
85 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
58 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
59 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
100 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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1answer
119 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
117 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
78 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
81 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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4answers
281 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
39 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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68 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
72 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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52 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
83 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 ...
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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
125 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
65 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
78 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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52 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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76 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
140 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
91 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
192 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
4k 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 ...
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1answer
327 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 ...