Questions tagged [dac]

A DAC is a Digital to Analog Converter.

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Composite video with 8-bit DAC

recently my eyes got caught by this YouTube video It shows how ESP32 can draw analog composite video using I2S -> DMA -> DAC. I considered using this concept in my project but it has a little ...
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Scaling PWM amplitude using analog switch at MHz timescales

I want to scale the amplitude (the High level) of a PWM signal by switching the output of a DAC. I am using MCP4822 12-bit DAC to generate 0 - 2.048V and switching it using a SN74LVC1G3157 analog SPDT ...
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Old school electronic technician, new to DACs

Old school (1993) electronic 2-year graduate familiar with the now-obsolete simple ML2035 8 bit DAC. Haven't dabbled in electronics in nearly 27 years. There are no replacements for the ML2035. I'm ...
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How to get a clean clock signal from FPGA to DACs?

I have the VC707 FPGA board and an external reference clock (fairly clean 100MHz), that I want to use as a reference for a 200MHz generated clock on my board. Then using this clock to clock my DACs (...
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Calculation of unity level (0dB) after gained VCA

Basically I'm controlling a VCA (AS2164) with my Arduino through a 10 bit DAC. All is working well. The VCA output is then gained x 3.3 though an op amp, which in my calculator gives a 10dB boost. The ...
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Differential DAC filter capacitor options

The standard output filter for a DAC with a differential voltage output looks this way: simulate this circuit – Schematic created using CircuitLab However, some DACs have this filter ...
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Random noise in speaker with ESP32+DAC+Amplifier

We are facing the following issue with our application board based off ESP32 module. We are using PCM5102 from TI as a DAC running over a I2S interface. The DAC is connected to the TPA3136 amplifier ...
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SDR Bandwidth and sample rate

I saw that SDR has two parameter: bandwidth and sampling rate. I would like to know the difference between them because i saw a 56MHz bandwidth SDR but by looking at the chip used inside the sampling ...
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I2S DAC UDA1334A module distortion under load

I am trying to use a UDA1334A I2S DAC module (pictured below on the right) with an ESP32-S3. I connected everything as described in the documentation by Adafruit (https://learn.adafruit.com/adafruit-...
Nejc Jezersek's user avatar
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Which signal should be fed into the single ended input of the PAM8320?

I'm feeding audio from this DY-SV17F module into this PAM8320 amplifier. The configurations I believe I can choose from are: 1: Feed either DACL or DACR from the module to the amplifier. 2: Combine ...
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Creating a 4-20mA current loop based on a voltage [duplicate]

I need some help/advice on making this circuit. A DAC outputs a 0-5V or 1-5V or whatever voltage I want, and it needs to be converted into a 4-20mA signal that goes into the 4-20mA pin of a Hawk-4G ...
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Control (0 - 10 V) fan from LM358

I want to generate output of (0 - 10 V) from ESP32 GPIO (0 - 3.3 V). Basically fan is connected to the output. I am attaching a circuit of it. Do I need any changes in the design or it will work? Will ...
Zunuran Nasrullah's user avatar
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2 answers
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How to set desired current for a 4-20mA Arduino Circuit

So I am making a circuit that outputs a 0-5 V signal (Arduino into a DAC), and the DAC's ouput voltage goes into an op-amp to convert voltage to current. I've attached the current op-amp portion of ...
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RS-170 and SMPTE 170M Encoder

I have been searching for a Video Encoder (DAC) that can output composite signals that are EIA-170/RS-170 and SMPTE 170M standard compliant. I might not be understanding these standards correctly but ...
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Genlock Analog Video

I am currently converting an TMDS signal into composite. Please see block diagram. The video encoder outputs the H-Sync and V-sync. I am also getting an external sync source that I need to use to ...
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Using a DAC to measure system gain

I am using a Wheatstone load gauge through an AD8295 op-amp to a SAMD21 uC ADC. The op-amp uses a resistor to set gain. An analog switch is used to change gain. Since the resistors are not exact (G = ...
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Convert Composite Video to RS-422 [closed]

I misinterpreted my requirements and asked the question below, which does not make sense. I am designing a Digital (TMDS/HDMI) to Analog (Composite) video circuit. I am almost to the end. The last ...
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9 votes
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Regular DACs versus audio DACs

Context In trying to make modular linear power supply with digital control, I figured I'd need a DAC to output the correct voltages into the feedback circuitry (two - one for voltage and one for max ...
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4 votes
4 answers
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Is DAC used as stand-alone IC in a circuit?

An ADC will need an anti-aliasing filter to remove signal spectrum above the Nyquist frequency and a buffer so that the signal source is not loaded by the ADC input. For a DAC, what does one need to ...
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What's the point of an internal reference on an ADC/DAC?

I'm designing a circuit using the AD567XX (datasheet) family of Digital to Analog Converters. I'm confused by the Reference Voltage Pin (Pin 21). It seems that one of the distinctions between ...
Jezen_Volk's user avatar
2 votes
2 answers
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QPSK Modulation towards DAC

Modern DACs are able to accept 2 digital values (representing I and Q), multiply them internally by a Sine and Cosine waveforms and combining the result to form the output signal. When dealing with ...
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What are the components inside ADC and DAC? [closed]

My question is this: What are the components inside ADC and DAC? Is there only transistors/logical gates and is there difference between like analog audio to digital audio ADC or other types of ADC ...
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Unexpected DAC output waveform when connected to a line input

I'm using a TAS5754MDCAR DAC in a Bluetooth receiver. DAC_OUTA and DAC_OUTB are connected to the internal amplifier inputs per the Datasheet (as below): When I play an audio file and view DAC_OUT on ...
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How do you use a DAC IC?

I'm attempting to use a DAC0802 chip from Texas Instruments, but I can't figure out why it's not working. Before anyone asks, yes, I've read the datasheet. Below I've added a diagram of the voltage on ...
Steam Ranger's user avatar
3 votes
1 answer
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Best practice to constrain dynamically tuned FPGA->DAC data path

Data is moved from the Zynq 7010 to AD9779A DAC using parallel SDR link at 155.52MHz. This DAC generates DATACLK clock that is used to clock data out of the FPGA (see picture for the relevant FPGA ...
Oleg Skydan's user avatar
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1 answer
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USB to Windows with MCU/Discrete Chip?

I've been looking into building a USB DAC for my headphones but I'm struggling to find any info on how USB on windows or MacOS works. I guess I need to know what a chip needs to have in order to be ...
thermalVia's user avatar
1 vote
1 answer
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Debugging Audio DAC. Got no output. (Schematic, Artwork included)

I have my custom board designed and got no output from DAC. (I connected AMP - Speaker but got no sound) DAC: PCM5102APWR (Datasheet) I am using ESP32­-PICO-­MINI-­02 to output sound to I2S. Thank you ...
thankyounaly's user avatar
1 vote
1 answer
103 views

XTR116 cannot control less than ~4.4mA

I recently purchased a MikroElektronika 4-20mA T Click MCU Add On Board MIKROE-1296, which features a MCP4921 DAC and XTR116 current loop transmitter, to control a current between 4-20mA. However, I ...
Alexander Navasca Skinstad's user avatar
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What op-amp can I use in this output filter recommended design?

I'm working with the Cirrus Logic CS42448 codec and would like to implement an active filter output to differential audio signals. The output should be line level to be connected directly to external ...
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Will DAC81404 work as as piezo transducer driver?

I am in the process of designing a PCB that will drive a piezo transducer that is split into 4 quadrants with a DAC81404. The piezo transducer will move an atomically sharp tip to probe the surface of ...
C Geeeee's user avatar
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Will a common mode choke and a FET switch cause issues in this circuit?

I have a 12v 5A generic switch mode power supply which I use to power my USB DAC for streaming music through my PC to an amplifier and speaker combo. I have discovered that adding 6 x low ESR 4,700uf ...
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DAC noise floor vs resolution

For an amplified DAC output, the noise floor is as following: I want to move this galvo mirror with the DAC. Which voltage parameter tells us what is the minimum increment can be sensed by an ...
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Settling time vs T of PWM Signal

I reviewed this article: https://www.edn.com/a-faster-pwm-based-dac/ where it says the settling time of the DAC will be 5RC (till here we are ok), in which RC=16 T of PWM than if this is true than we ...
Fc3 Fc3's user avatar
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Bandwidth of a DAC

Could anybody specify what does this bandwidth means in DAC PWM? Source: Designing high-performance PWM DACs for field transmitters (page 2) The bandwidth of a DAC?
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PWM DAC, dividing the 8 bit PWM DAC in 2 four bit PWM DAC [closed]

Can anybody explain what the purpose is of dividing an 8 bit DAC using PWM in two 4 bits DAC and how is it made possible the scaling of PWMH and PWML and how do they affect in total uncertainty. https:...
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Is USB 2.0 Shield Wiring Necessary For a Power Only Connection? (Power Supply to Raspberry Pi)

I am building a low ripple power supply for my Raspberry Pi Zero 2W + DAC combo. The output of my power supply will be a female USB A 2.0 connector, using a regular USB A to Micro B cable to power my ...
DrSteveBrule's user avatar
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1 answer
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Single channel 4-20 mA current loop transmitter

I'm designing a single channel 4-20 mA current loop transmitter using XTR111 IC. By following the reference design guide from TI. link: https://www.ti.com/lit/pdf/tidub12 Circuit schematic reference: ...
John Mist's user avatar
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How to fix this error on DAC0808 with LF351?

I am testing this schematic from the DAC0808 datasheet at 10kHz frequency digital input, current 0, 1 and 2 mA but output had error see fig.Vout should slightly than this. How can I decrease this ...
Phongpit Sribua's user avatar
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Adding voltage from multiple voltage dividers

I have the following schematic set up, where all of the resistances are known (I just didn't add them to the schematic as they should be irrelevant). If I read the voltage across the ground and the ...
Mark Jameson's user avatar
1 vote
0 answers
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Buck converter programable CC with DAC

I am trying to implement a programable CC (Constant current) functionality into the utilized buck converter (AP64501SP-13). The converter is to be used for series cells charging. I need to be able to ...
Łukasz Przeniosło's user avatar
2 votes
1 answer
223 views

Why are two OPA4227 op amps used in this circuit? What does the second one do?

This DAC circuit drives a piezo buzzer used as a scanning tunneling microscope tip. The X, Y and Z are the final outputs that drive the piezo. Why does it use two opamps per channel output? From my ...
C Geeeee's user avatar
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Voltage reference required for DAC81404

I want to create a driver board to control a piezo actuator. I have a DAC81404 DAC laying around, but I am confused as to how the voltage reference works. I want to drive the piezo from -15 V to +15 V,...
C Geeeee's user avatar
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1 answer
106 views

Control a DFGT-03MC01 with ESP32 DAC

According the the datasheet of the DFGT-03MC01, it is possible to control the flame: "The fire will only switch on when the voltage has first been higher than 2V and then lower than 1.5V. For ...
Koen Demonie's user avatar
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Determining values for active low-pass output filter for DAC

I'm trying to use a PCM1780 as DAC for my audio circuit. The datasheet shows the following recommended output schematic for this DAC, for which I'm trying to choose component values (because they do ...
Pelican's user avatar
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2 answers
135 views

What is the purpose of the R-divider in a String DAC?

I'm not sure if this is duplicate but a String DAC model is always shown as follows: And R-divider is equal to the sum of the DAC resistors below it. And to compensate that a gain of 2 is used at the ...
cm64's user avatar
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Getting audio hiss out of my project

I'm trying to build a small audio toy for my daughter. I am using a Raspberry Pi Pico and the C SDK. I am able to successfully play a pre-recorded WAV file stored as a C header file using the DAC and ...
JBrooks's user avatar
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1 answer
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What is the role of master clock speed on DAC?

In the I2S protocol we have 3 signal + one none-standard master clock (mentioned by Olin Lathrop): data LRCK/FCK (frame synchronizer) BCK (bit clock) MCK/SCK (master clock) Question 1: Why do we ...
mohammadsdtmnd's user avatar
3 votes
2 answers
87 views

Potentiostat wave-like waveform output of the system on square wave voltametry

This is a question I managed to solve! But because it took me 2 weeks to find out the issue and write this whole question, I leave it here for anyone that might face the same issue at the future. ...
Christianidis Vasilis's user avatar
0 votes
1 answer
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How do I make a good frequency multiplier for a basic sound chip? It uses a DAC, so it needs a high input frequency for lower output frequency

I'm building a simple triangle-wave sound chip based around a 4-bit DAC. It works, but I have to have each individual square wave for each of the 16 notes (which are bass-range, 60Hz-238Hz.) I want to ...
cheese's user avatar
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Which external DAC can be used with STM32F7?

Problem Statement: I'm developing hardware for piezo scan for which I need analog output in form of ramp signal which will be feed to piezo. Piezo operating range is between 0 to 30V. So I will ...
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