Questions tagged [dac]

A DAC is a Digital to Analog Converter.

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True zero offset current DAC

Is there a current DAC which has 0 current (< 1 nA) for an input code of 0? I am driving an LED, so would it make sense to use bipolar supply rails (where a negative output would reverse bias the ...
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1answer
63 views

KiCad Saying Pins Not-connected

So I am fairly new to using KiCad, and I have encountered a problem. I recently learned how to make hierarchical pins for bus assignments with the notation. ...
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64 views

DAC7760 voltage and current output

I use the following function to send data from STM32f1 to a DAC7760: ...
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1answer
54 views

Control of large number of analog devices

For research that I work on we have photonic chips that have 100-200 analog devices on board. I wish to control these devices at a rate of ~-1 MHz from an fpga. Some require a current source and ...
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65 views

Need to map 0-5V DAC output to 0-10V output

I am using a TLV5618 to take a 16 bit SPI package to produce a voltage between 0-5V with 12 bits of resolution (4 control bits). Now I need to shift this signals from 0-5v to a 0-10v signal. I do ...
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63 views

Increasing output current of DAC

I have an application where my Arduino is controlling a mcp4725 DAC for a design replacing a sensor on an old car. The DAC provides the analog output voltage, .25V to 4.9V to the computer. I recently ...
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55 views

H-bridge, LED driver, DAC

I am trying to interface a circuit with an FPGA. There is an H-bridge in the circuit that is driving me crazy. The inverted RED and IR signals are coming from FPGA. The light intensity signals are ...
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1answer
44 views

Is it possible to increase the current avalible without changing voltage on my DAC circuit?

I am using a Raspberry Pi and a Adafruit MCP4725 to control a mass flow controller, as well as powering the DAC, and I am meeting the bare minimum of current to control it with the Adafruit MCP4725. ...
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96 views

How to calculate resistor values for a VGA DAC

I have an FPGA and want it to drive a VGA monitor. I want more than 3 bits of color so I need a DAC of some sort. So I want to make a resistor dac. My plan is to have 3 bits per subcolor. So total of ...
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4answers
96 views

sound to voltage

I'm searching for a method that can convert sound to voltage. I have a .wav format file. The .wav file format is 16bit and 44kHz sampling rate. I want to play the .wav file on my PC and convert PC ...
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1answer
49 views

XTR111 4-20mA to 0-10V issue

I have below circuit which produce 4-20mA and by adding resistor (before the TVS) I can get 50ohm => 0-1V 250ohm => 0-5V but unable to get 0-10V since when I add 500ohm resistor, the voltage max out ...
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45 views

Different number of bit for the ADC and DAC linked to a \$\mu\$controller - Electrochemical sensor

I am studying an electrochemical sensor (see figures below please) where the number of the bit of the DAC (Analog Devices AD5685R) is 14, whereas the number of the bit of the ADC (Analog Devices ...
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47 views

MCP3008 sharing power supply with low-noise DAC

Asked this question on the Raspberry Pi Stack exchange and was redirected here! I'm designing a low-noise audio gadget that uses an MCP3008 ADC (for sensors) together with a Raspberry Pi and a ...
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23 views

How to ground a codec (TLV320AIC3105)

I'm trying to design a board with an audio codec. All signal connections seem to be pretty straightforward, but I have a major trouble with ground. I belive there are at least 3 contradicting ...
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67 views

stm32 audio generation

Currently I am working on a project with a stm32f302c8t6 mcu which I monitor an analog signal. I generate a tone using dac when the signal exceeds a certain treshold. My problem is that as soon as I ...
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46 views

Output Current Derating for Buck converter for powering RF sampling data converters

I am new to the use of DC-DC converters. I am designing power supply for powering DAC from TI whose part number is DAC38RF80. DAC38RF80 is high speed RF sampling DAC with sampling rate as high as 9 ...
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50 views

How does one calculate output voltage noise of a current output DAC?

I am using a current output DAC connected to a voltage reference and a transimpedance amplifier. I know the noise characteristics of the voltage reference and the amplifier. The DAC simply lists "13 ...
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30 views

Does the STM32F469I DISCOVERY board allows the user to perform Digital to Analog Conversion?

I have a question on DAC (Digital to Analog Conversion) capability of the STM32F496I DISCOVERY board, which uses the STM32F469NIH6 (216 pins) microcontroller. According to the microcontroller's user ...
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1answer
79 views

Digital to Analog Conversion with STM32F7 Discovery Board

I am a mechanical engineer interested in Data Acquisition and Closed-Loop Control projects. As a beginner who wants to work with STM32 microcontrollers, I have a specific question about the STM32F7 ...
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30 views

Supply current for AD5754R

Supply current of Ad5754R is not mentioned on the datasheet. How to calculate the supply if it is not mentioned on the datasheet ?
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2answers
47 views

DAC output is completely dependent on Vreff?

I want to generate unipolar and bipolar output voltages 0-10V and +/-10V respectively. I am thinking of using AD5752R for this purpose, my requirements meets with this particular DAC. My doubt is ...
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1answer
58 views

Generating unipolar and bipolar voltages from AD5752

The AD5752 consists of two DACs internally. Can I use one DAC to generate unipolar voltage and another DAC for bipolar voltage simultaneously? It is a dual channel DAC. Datasheet
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1answer
73 views

Cap in Series with a DAC Reverse Current

I'm using a 8-bit DAC: (DAC5311IDCKR) to generate a 1.5V Amplitude sine wave with a 3.5VDC offset. I've put high-pass RC filter across it shown below to block DC so that it becomes AC. I understand ...
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1answer
52 views

Can I use a voltage controlled resistor to adjust high side switch current?

A number of high-side switches (e.g. the NCP380) go into constant-current mode when the programmed maximum current is reached. This is typically set with an external resistor according to the required ...
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23 views

Naming confusion, how to connect DAC (BB/TI PCM1603KY) I2S, which pins do I need to use?

I am totally new in the field of DAC's and I2S. I salvaged this board from a DVD player and is well documented. There are three data lines DATA1..DATA3 that will be used for ...
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133 views

New Amazon music streaming service and Nyquist sampling theorem [closed]

I read this story on The Verge the other day, “It’s a better bitrate, better than CD quality,” said one of MBW’s sources, indicating the new service will put Amazon in direct competition with Tidal’...
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158 views

0-3.3V to 0-5V step by step [closed]

I have a 3.3V microcontroller. I want to use dac. I will work 0-5V range. But my microcontroller has max voltage 3.3v. I want to use a amplifier. I wait your recommendation. note: how can i this. ...
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1answer
26 views

Dual DAC channel selection in PIC

I need to communicate with this DUAL DAC by using SPI : MAX 5223 Dual DAC There are 2 DAC outputs in this chip and I am confused that how can I select and write to the specific one. There is CS pin ...
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1answer
39 views

CS43L22 DMA constant beep noise

I am using CS43L22 with STM32F4 discovery board. I generate sounds by sending I2S messages to CS43L22 using circular DMA buffer (32 size array). However, chip creates a constant beep whether it's ...
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242 views

I want to create a stable 0-10 V DC output from a 3.3V PWM signal (arduino/esp8266)

I want to control an EC motor, but I have some difficulties with the motor's control input. According to my measurements it has a ~50kOhm input impedance, and probably also has an (unknown) RC low-...
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3answers
126 views

Trying to recover audio from PWM

I am trying to make a Raspberry pi Bluetooth receiver. I finally got the raspberry pi to output audio via bluetooth, however the output seems like it is a modulated PWM. The width of the PWM seems to ...
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1answer
57 views

Paralleling Multibit current DAC: Improving Accuracy by Averaging

No doubt that if I put in parallel n DACs, multibit (i.e. 16 bit) current output R2R ladder chips, I get n-times higher current at the summing node and the output impedance is also reduced by "n". ...
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1answer
37 views

ML06 Micro To Micro USB wiring

I tried to DIY to make a custom cable like the one in link: https://www.fiio.co.in/collections/accessories/products/ml06-micro-to-micro-usb-data-cable?variant=12395665326185 I bought 2 normal usb ...
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1answer
66 views

Which PCM data format to choose I2S or Left-Justified? [closed]

I can't find any information which PCM data format is better - I2S or Left-Justified and why I should use one format over another. Is there a difference or it doesn't matter which one I'll use?
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1answer
88 views

Current-to-voltage opamp in DAC application: snubber network between inputs

In transimpedance (or current-to-voltage) opamp application for DAC, it is reccomended to put at the opamp inputs a capacitor (together with a snubber RC network through the feedback resistor), in ...
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1answer
113 views

No output voltage from TI DAC chip, with stm32F7

I am using DAC60508 with my STM32F7, 60508 is 12 bits precision, and with 24 bits command-length, SPI interface. After initialize the SPI, I send 3 bytes separately, and I use a oscilloscope to check ...
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40 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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23 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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1answer
55 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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51 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
66 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
71 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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2answers
46 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
32 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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35 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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38 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
168 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
44 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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2answers
88 views

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

I'm not quite sure how level and impedance bridging 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 ...