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Questions tagged [dac]

DAC stands for Digital-to-Analog Converter, and is used for outputting analog signals from a digital input, typically a microcontroller.

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Digital-to-analog-converter PCB: Ground plane cut or not?

I'm designing a DAC board and I'm not sure what would be the best thing to do regarding grounding, to minimize noise. This is the approximate layout I have so far, with the system ground point (also ...
blockworker's user avatar
1 vote
0 answers
20 views

Not correct reading in ADCs DACs integrated system

I made a ADCs board (AD7194) and DACs board (AD5689). Each DAC (separated ground) could output 0-5V, and Each ADC channel could measure 0-3.3V. I used a voltage divider network to turn 0-5V to 0-3.3V. ...
Dar's user avatar
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5 votes
2 answers
166 views

How do I create a circuit to reliably calculate a range of unknown resistances?

I'm designing a low power circuit which serves to determine the unknown resistance across a 16 channel sensor. So far the results are bit subpar. The resistances are a function of a different applied ...
AuFries's user avatar
  • 113
2 votes
1 answer
79 views

Is this extra cycle before the MSB a common thing with serial bit timing?

The products that this is specifically around are the Pmod I2S2 which uses the Cirrus CS5343 ADC and CS4344 DAC. It is plugged into a STM32F407G-DISC1. Now I am having some trouble figuring out ...
robert bristow-johnson's user avatar
0 votes
0 answers
66 views

Looking for feedback on audio schematic [closed]

I'm making an mp3 player and I'm looking for feedback on the audio side. It takes an i2s input from an esp32(not in this sheet), and outputs to a headphone jack. This is my first audio project (...
Rufus Ahern's user avatar
3 votes
1 answer
87 views

Why wouldn't one use a DAC for an RF transmitter?

I'm wondering what would be the reasons that someone would use something other than a DAC to generate IF signals before they're mixed up to RF. With how fast modern DACs can be (30 MSPS from some ...
Arthur Prudius's user avatar
0 votes
1 answer
36 views

Why does input data rate reduce with higher interpolation factors in interpolating DAC's

I am reading the specs of AD9152 and not entirely sure on how to interpret some information. the diagram below shows that max input data rate (Which I interpret as the rate at which the DAC can accept ...
peter's user avatar
  • 99
2 votes
1 answer
90 views

Please explain why datasheet says to connect the feedback resistors in a particular way

The datasheet for the AD667 DAC shows how to connect the output to internal feedback resistors in different ways, in order to get different output voltage ranges. For output range of 0 to +5 V, it ...
charles's user avatar
  • 51
0 votes
2 answers
63 views

Darlington control with Op Amp and DAC

The purpose of my circuit is to control(current) a servo motor with the 4096 steps of the DAC MCP4725. Currently this circut is not turning on the NPN Darlington, I don't know why that. The DAC is ...
johnnytolengo's user avatar
1 vote
0 answers
71 views

Best place to add DC biasing

I'm working on a circuit where I have a CS4344 audio DAC feeding into a LM324 inverting amplifier that uses 1.2v as a reference voltage. I'm staring with the example circuit shown in the CS4344 ...
ajcrm125's user avatar
  • 111
0 votes
0 answers
47 views

Reading ECG wave data from .dat and .hea file from SD card with Arduino DUE to produce it on DAC pin

I am trying to produce an ECG wave on the DAC pin of the Arduino DUE. Here are my setup details. SD card is attached to Arduino DUE with SPI connections. I have 2 files (.dat and .hea) of ECG data on ...
Noor Hassan's user avatar
0 votes
2 answers
72 views

Why do high speed DACS have I/Q

I am working on an application which required D to A conversion of two different high speed signals. The DAC I am using from TI has many functions related to Q/I input signals specifically. I would ...
peter's user avatar
  • 99
0 votes
1 answer
115 views

Noise in audio project with ESP32

I built a very simple web radio based on a PCM5202 module (purple with 3.5mm output jack), an ESP32, and this github project. Here is the schematics (forgive the crudeness) simulate this circuit &...
Jerther's user avatar
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0 votes
0 answers
27 views

DAC errors and voltage mapping (0.3-3v to 0-2.7v)

Using MSP0G1505 MCU. It has a inbuilt DAC. I thought it could give me 0 to vdd as output but it seems it can only give 0.3 to vdd-0.3 as output. This happens because of the offset and gain errors. ...
funtastic rdj's user avatar
0 votes
1 answer
55 views

Controlling voltage of a device (Peltier cell) without PWM and with high current (max 5 V, 1 A)

I would like to be able to control the power of a Peltier cell, the TEC1-04901, (5 V, 1 A) in such a way as to control its temperature. I have already tried using a PWM control using a transistor ...
Massimiliano Ferrari's user avatar
8 votes
2 answers
848 views

Unreasonably low slew-rate of a DAC0800 and TL072-based waveform generator

I'm building a simple waveform generator based on the Raspberry Pi Pico, a DAC0800 IC and a TL072 op amp. The circuit works, but the slew-rate is - I believe - unreasonably low for the components I'm ...
Peter Lenkefi's user avatar
0 votes
1 answer
48 views

MDAC AC reference input

I previously had a question on using AC reference voltage with a MDAC, But it has been addressed nicely in the answer below. How does the "Multiplying Bandwidth" specification relate to a ...
Chetan Karkera's user avatar
0 votes
2 answers
40 views

How does DAC remap in STM32F103 (high density series) work?

May I remap the DAC output pins of my STM32F103ZET to another one? I saw this in the reference manual: But cannot find anything about the pin outputs.
Roh's user avatar
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0 votes
0 answers
31 views

XTR111 4-20mA/0-10V before mux stage

I am currently designing a PLC-like module based on a STM32 microcontroller. I want to have up to 8 analog outputs generating 0-10V or 4-20mA signal. I am heavily relying on this design by TI: https://...
Sobekurxo's user avatar
0 votes
2 answers
99 views

Driving speaker with differential driver

I am designing an battery powered device (3.6-4.1 V regulated down to 3 V) which plays audio recordings through a speaker (8 Ω, 0.3 W). I want to drive the speaker by applying two differential inputs, ...
dvd280's user avatar
  • 135
0 votes
3 answers
133 views

What kind of BJT buffer should I use to connect a speaker to an STM32?

I'm trying to connect a speaker to an STM32. The purpose is to create sound using the DAC. The speaker I'm talking about is 0.5 W and 8 Ω. Tell me if I'm right: based on this the current will be 0.15 ...
Roh's user avatar
  • 4,650
2 votes
1 answer
94 views

Can I set LVDS permanently to HIGH or LOW with this simple circuit?

I have a chip with 14-bit LVDS input data lines (DATA0P/N to DATA13P/N) on the chip DAC3174. I don't have enough space left to route all these data lines, so I chose to set the two least-significant ...
johnny_1010's user avatar
1 vote
1 answer
76 views

Current DAC/current wave-form generator [closed]

I am designing a PCB on which I need to generate an arbitrary current waveform. The maximum current output is (-+6 uA), resolution >=8 bit, fast settling <=0.1 us, sampling rate >=5 MHz. I ...
Bakr Hesham's user avatar
0 votes
1 answer
75 views

STM32 DAC sinewave generation

I generated according to this document two same sine waves (on two pins of the microcontroller DAC). I display them on the oscilloscope and obviously overlap. Now I would like to offset the first one ...
KaleM's user avatar
  • 473
0 votes
1 answer
49 views

Scale and offset voltage range from DAC to VCA

Still tinkering with my VCA based effect mixer. I control multiple DACs (MCP4922) which send control voltages to the VCAs (AS2164). Until now I've just fed the DACs a reference voltage of 3.3V to ...
Jesper Kragh's user avatar
1 vote
3 answers
94 views

Drive the current control pin with a voltage

I am aiming to use the TPS929160-Q1 LED Driver for a project. Basically I need to drive LEDs with PWM signal from a MCU (which this component can do very well) but the project also requires to be able ...
Nucrino's user avatar
  • 25
4 votes
1 answer
104 views

How does the "Multiplying Bandwidth" specification relate to a DAC output's maximum bandwidth

I'm struggling to understand what it means for a DAC to have a Multiplying Bandwidth of 200kHz. Does it mean that the max frequency component in the DAC's output cannot exceed 200kHz for reliable ...
Ninja Ron's user avatar
2 votes
1 answer
93 views

How to increase the output range of a current source?

I'm trying to design a current source to charge a capacitor (10pF) in the context of IC, with quite a small voltage headroom (1.5V). I started with the basic current mirror, as shown below. M3 acts ...
Jack Black's user avatar
0 votes
1 answer
49 views

DAC sample rate vs settling time applications [closed]

Trying to understand the trade space on a DAC with a higher sample rate spec versus the longer settling time (same exact part). I'm trying to reconstruct analog waveforms for a DSP application, so ...
Sittin Hawk's user avatar
0 votes
1 answer
81 views

What is the relation between number of LUT values and output frequency?

VLSI/FPGA beginner here. I interfaced my Digilent Arty A7-35 with a DAC, using basic DDS (implementing timing diagram of the DAC on FPGA) and interfacing LUT(s) to form sine waves of multiple ...
DaveFenner's user avatar
0 votes
1 answer
84 views

How to correctly switch between two analog signals before op-amp

I have two sources to generate a ramp signal to drive a voltage controlled oscillator. Source one is DAC of the STM32H743 and the second one is RF Synthesizer ADF4158's charge pump output. RF ...
Cenk's user avatar
  • 75
2 votes
1 answer
35 views

What is the difference between the DAC8562 and DAC8562T chips from Texas Instruments?

These two callouts have distinct product pages (https://www.ti.com/product/DAC8562?dcmp=dsproject&hqs=pf and https://www.ti.com/product/DAC8562T?dcmp=dsproject&hqs=pf) and distinct data sheets....
BradP's user avatar
  • 43
2 votes
2 answers
204 views

External DAC (DAC8568) software calibration

I'm using a 16-bit 8-channel DAC (DAC8568), driven by STM32 MCU. I need to obtain the 0-5V and 0-10V switchable output range, so to achieve that the voltage must be amplified with op-amp. This raises ...
coldmind's user avatar
5 votes
2 answers
694 views

RGB digital to analog converter

I am seeking help to design a small PCB that can translate digital RGB like Neopixel to analog signals for driving high current LED RGB. I know it's a bit weird. I would like to connect to a board ...
Jesper Egsgaard Nielsen's user avatar
0 votes
3 answers
160 views

Scaling DAC voltage to smaller range for controlling gate of transistor

I need to scale a DAC voltage which is ranging from 0-5V to a voltage ranging from 3.8-4.2V to control the gate of a mosfet in its linear region. I want the 0-5V range from the DAC to linearly ...
Nego24's user avatar
  • 25
0 votes
0 answers
51 views

TINA-TI - trouble with Digital-to-Analog Converter DAC161P997 Self-Powered Transmitter

I'm dealing with the DAC161P997 simulation on TINA-TI. Using the model from TI, the circuit appears to function correctly only if I leave out the capacitors on the pin. Here's the setup – Data ...
Morena Fabozzi's user avatar
0 votes
1 answer
153 views

Horrible noise coming from speaker when using SDIO

I have both an SD card and a MAX98357A (I2S Amplifier) breakout board connected to my STM32 Nucleo. As soon as I open a file for reading in FatFs using the f_open ...
Movieboy's user avatar
  • 217
0 votes
1 answer
50 views

Code transition glitches in an ideal DAC

I have read in most books and articles that a code-to-code glitch is caused by imperfect timing in the switching of bits into a DAC. If that was true, then there should be no glitch when you use an ...
Borenstein Boar's user avatar
0 votes
1 answer
60 views

PWM Low-pass filter for LCD contrast pin with a potentiometer?

As a software developer, electronic engineering isn't my strong suit, so I'm struggling to understand some simple concepts regarding this circuit. This is a unique circuit I have encountered that is ...
David Refoua's user avatar
0 votes
1 answer
47 views

Which DAC is being used? [closed]

If a Samsung 10 phone is connected to an aftermarket head unit in the car via USB-C from the head unit USB-A, which DAC is being used? A car audio forum says the phone DAC, but then that would mean ...
Jeff-hires's user avatar
0 votes
0 answers
47 views

What modes are supported by ADS1299 for powerline noise reduction, and where to connect them?

I am using this ADS1299 Frontend Board with a Rp2040 Pico, my SPI connections and lib work fine, but I am facing problems in understanding how to use a refference electrode, I am getting good signals ...
Ashfaque Khan's user avatar
2 votes
2 answers
207 views

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 ...
user3500960's user avatar
1 vote
2 answers
63 views

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 ...
itheo92's user avatar
  • 11
4 votes
2 answers
135 views

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 ...
Hippy's user avatar
  • 41
0 votes
2 answers
191 views

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 (...
johnny_1010's user avatar
0 votes
1 answer
66 views

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 ...
Jesper Kragh's user avatar
2 votes
2 answers
100 views

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 ...
bkxp's user avatar
  • 181
2 votes
2 answers
593 views

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 ...
Sarth Dave's user avatar
1 vote
0 answers
115 views

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 ...
PiraLezz's user avatar
0 votes
1 answer
426 views

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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