Questions tagged [adc]

An ADC is an Analog to Digital Converter. This device converts analog signals into digital form. It is mainly used by the digital circuitry to take analog measurements.

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Implementing A/D conversion circuit to a DIY clamp meter

I was looking for cheap clamp meter projects and found this one: DC non invasive current clamp for oscilloscope DIY. After reading about this project, I noticed that it had a BNC output to read values ...
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Resistive Moisture Sensors, What is the purpose of the 2N3904 Transistor in the Sparkfun Circuit?

the two circuits below do the same things as far as I can tell, they both measure soil moisture using resistive sensing. However the one from Sparkfun is using a 2N3904 transistor, since the voltage ...
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Overall CMRR of analog front-end

My analog front end input consists of a chain of (instrumentation amplifier + differential amplifier + and ADC). Is the CMRR of the overall chain only considered based on the first element that is ...
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Wirelessly measuring voltage between two points? [closed]

I would like to measure a voltage between two points, wirelessly, but am stuck on the need to have physical contact between two points to be able to get a voltage reading... So I would like to be able ...
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Smooth wave plotting using 3 inch thermal printer [closed]

I am interfacing 3 inch Fujitsu thermal printer (FTP-638MCL103) with STM32. Character printing is working fine. I am struggling to print smooth sine waves generated from a function generator. I want ...
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Measuring AC current with a current transformer and ADC

I'm looking at using a current transformer (CT) to measure 50hz sinusoidal AC current with a microcontroller's ADC. Is there a way to measure the RMS or average of an AC signal with good response ...
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Which noise sources dominate in a receiver?

For a radio receiver that digitizes over-the-air RF signals (such as an SDR), my assumption (as a DSP guy; pardon my hardware ignorance!) has been that thermal noise dominates total receiver noise, ...
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Needed input on this circuit. How to measure motor output (+Ve and -Ve) using ADC?

Vin- output of the motor (+5 in one direction and -5V in the reverse direction--motor rotation) Va- is the ADC voltage which will be connected. Will the circuit shown below have any issues? Basically ...
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ADC doesn't start from 0V

I have a STM32L053-Disco eval board, and I'm building a capacitance meter. For it to work, I have to calculate the charge time on my capacitor. The approach that I'm taking is to set 1 GPIO pin to ...
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Can I drive a bridge sensing circuit with a voltage reference?

On the specification sheet there is this application circuit where the sensing bridge circuit is driven by the same voltage reference IC that sets the voltage reference (REFP) of the ADC. I remembered ...
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How can A/D conversion perform linearization of nonlinear I/O behavior of sensor recordings?

Usually we use Taylor series expansion while taking just the first few terms in the process of linearizing a nonlinear data of sensor recordings. However, another method exists which involves A/D ...
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ADC clock and sampling rate using FPGA

I'm using an FPGA to drive an ADC, let's say AD9226, 12-bit resolution, and 65 MSPS sample rate. I can drive it with a 50 MHz clock - from my understanding, that will give me a 50 MSPS sample rate. ...
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STM8L ADC multiple channel read Problem

I am using STM8L151Cx with Cosmic C compiler to develop a 3 phase ammeter. I run into an issue during my last stage of development. 3 Phase current is connected to 3 channels in the controller via Op-...
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MCP3008 question about voltage

I am using the MCP3008 as an ADC. What voltage is practical to be used? The datasheet for the MCP3008 specifies Vref = 5V and Vdd = 5V. Other comments I read in the forums is that the desired voltage ...
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ADS1115: Using 5V supply instead of 3V, do I need to increase the logic level signal from 3V to 5V?

I am using a microcontroller that has a 3.3V Logic level output. The microcontroller is connected to ADS1115 via I2C pins, and the ADS1115 can be powered with 3.3V or 5V depending on the range of ...
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4 answers
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How can a DMM measure open circuit voltage?

This question has bugged me for some time now. How can a DMM measure open circuit voltage? I have a general grasp of how ADCs work. How is an open circuit voltage measured when that should produce a ...
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Use ADS1115 to measure voltage

I would like to measure the voltage of each element of a battery pack made of 18650 cells. I use an ADS1115 to get the voltage. My problem that when I measure an element each time everything is ok ...
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Input signal bandwidth of ADC

I prepare to use adc to do sub-sampling. Most SAR adc has -3dB input signal bandwidth in datasheet but no for delta-signam adc. Can I use modulation frequency as the bandwidth or there is another way ...
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ADC stops functioning when cold

EDIT: VERY INTERESTING TEST RESULTS I just tried inducing the thermal failure using an inverted "can of air" (likely difluoroethane). It even when its super cold, (might even be below -40C), ...
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How to measure bit resolution

I have a system that has a bit resolution of 1.9uV (gain 20), to increase the bit resolution the gain stage was increased at the input of 180V/V which lowers the effective bit resolution to 0.21uV. I ...
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PSRR of an amp + ADC input stage

I have an input stage that consists of an amplifier then an ADC. The op-amp and ADC are powered by Buck voltage regulators. I want to measure the PSRR of this stage, so I am planning on breaking the ...
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ADS1230 shows a large offset

I'm using an ADS1230 for measuring the output of a pressure sensor (MPXM2053). The schematic of the circuit is shown below and some voltages are as follows: AVDD = 3.304V DVDD = 3.304V Common-Mode ...
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Mapping different resolution ADC to DAC

I have a 24-bit ADC that is controlled by an FPGA. I want to take the ADC input and output it from a 16-bit DAC that is also controlled by the FPGA. Do I simply ignore the 8 LSB bits of the data and ...
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Capturing High Speed I2S To SD Card

I've been working on a project that involves receiving two high speed I2S lines and writing the data off of them to an SD card. The interface has the word select and bit clock I2S lines shared between ...
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How to use DMA to sample external ADC (16bit ADS8688) using SPI with both single ADC and daisy chain configurations

I am using an STMF446ZE MCU for a data acquisition + engine control unit application. My application uses four ADS8688's to sample 32 sensors. 28 of them are required to be logged at 100 Hz while the ...
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What does the circle with the “X” and the cross mean?

I am taking a look at a DSP block for a the Xilinx ZCU111 FPGA and I am getting held up on a simple question. I come from physics so I am not too used to looking at block diagrams yet, but what do the ...
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How to read four load cells with a single ADC input?

I am currently using strain gauge based load cells and want to weigh 1-5kg granular products on whatever container with 4loadcells beneath. I encountered a problem with connecting load cells in a ...
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Is AXI a good interface for outside communications?

Suppose if we want to get some data from some ADCs, which are placed in a separate chip, and process that data in RISC-V processor. I was looking for an interface to define/use inside the RISC-V chip ...
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ADC (AD7768-4) shows +5 V on all AINx input pins

I am observing some undesirable behavior with my ADC, an AD7768-4BSTZ. At the four input pins of channels 0 and 1, I measure +5.2 V against GND with a multimeter. On the other hand, I expect a common-...
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ECG artifacts and two electrode ECG without a driven electrode (AD8232 analogue front-end)

I am using the SparkFun Heart Rate Monitor which contains the AD8232 front-end chip. I want to use only two electrodes (LA and RA) without the RLD driven electrode. I am aware that this question has ...
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ADC signal noisy

I have an Adafruit KB2040 μcontroller, which is based on the RP2040 chip from the rPi PICO. The Adafruit max9814 microphone hooked up to the ADC0 channel gave me a very noisy signal. So instead, I ...
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Help with AVR ADC and Serial port programming and integrating with python

I am a 2nd year electrical engineering student. I was stuck at this: Why do both seven segment displays show only 8 even when simulation is not running? Basically I am trying to take temperature data ...
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LDO not improving power supply noise

I'm trying to create a low-noise 3.3V power supply to power an ADC. The TI TPS7A53 LDO seems like a good option for this. It has low noise of 4.4 μVRMS and a worst-...
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Sequence on MSP430 C code skipping certain flags [closed]

I am developing some code for the MSP-EXP430FR5994, specifically code using the MSP430's ADC. My plan for the ADC is to run a dual-channel ADC capture. However, I have only been able to run the code ...
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Connecting analog and digital ground planes back to power supply ground

Reference I refer to the article "Grounding in mixed-signal systems demystified, Part 2”, written by TI engineers Sanjay Pithadia and Shridhar More. Link here: https://www.ti.com/lit/an/slyt512/...
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If I invert an I2S data line, it inverts the audio, right?

It seemed obvious to me, but then I read all these audio forums where they're talking about overflow, tones, etc. and I just want to make sure I'm not missing something. If you take an I2S signal: ...
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Question regarding the ADC MCP3201 interfacing with PIC16F72 microcontroller

I provide the 1.2 MHz clock to SCK pin to the ADC from PIC clock pin, but how I can receive the data from MCP3201 ADC, which provides a 12 bit binary data on SPI pin SDI of PIC? Buffer of PIC is 8 bit ...
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Maximum input voltage Black Pill

I have a sensor outputting a 0.8 - 5.0V signal, where this analog signal is read by a 16-bit ADC, the ADS115. The ADC is capable of reading the maximum 5V signal since I am powering the ADS with VIN = ...
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MSP430 ADC, using a different memory slot other than MEM0

I'm working with the MSP430Ware Sample Code for a basic ADC on the MSP-EXP430FR5994 development board. On the code, it uses MEM0 and the supporting infrastructure such as flag 0 to convert. The one ...
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Analog sound data

I tried to make my own sound sensor on a PCB. I wanted to take analog sound data for my project. I used an ADC pin from a STM32G474, but I maded mistake while I designing. I took a KY-038 reference ...
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Capturing High Sample Rate I2S via USB

Recently, I started working on a project to convert my Sony XDR-F1HD radio to a device that I can connect to over ideally USB to record the RF signal off of the air. All demodulation and processing is ...
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My speaker connected to my TV is making weird noises only when playing videos [closed]

Apologies if this is the incorrect forum, if anyone knows of a better forum to ask on I would appreciate the redirection. I have a very specific issue regarding audio playback from my TV. I have a ...
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1 vote
1 answer
76 views

How to characterize an input signal?

I'm planning on doing some signal processing on my electric guitar with an MCU and I was wondering how I can characterize my input signal so I know if and what kind of pre-amp/ADC I'd need or if the ...
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Does phantom powered audio system's ADC also works on 48v

Phantom powered microphones with their preamplifier can generate signal from -48 to +48 volt (or 24 or 12), then it run through wire and maybe receiver and reaches ADC. I want to know if 48v signal is ...
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How is this peak DNL error in RP2040 ADC realised in actual use?

The errata of RP2040 datasheet mentions a peak DNL error in some values. I'm a newbie on ADCs but I always thought the DNL error is usually the same all over the range. Here itsays that it "peaks&...
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ADC anti-aliasing filter design for control system with torque sensor

I have a question regarding the design of anti-aliasing filter in feedback control system. The application is a mechanical control system that the controller compute torque command with position and ...
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1 answer
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Is ESP32's GPIO25 Pin adc1 or adc2?

I am trying to design a PCB with ESP32 and a Lora module I want to use serial1 for Lora RX/TX communications. I saw a board which is using GPI35 to Lora RX and GPIO25 to Lora TX. But in same time ...
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ADC and RC filter importance

TI and ADI suggest using an RC filter, ADI noted that SAR ADC have switching kickback and say it's really important but STmicroelectronic says the components of the RC filter discussed in the TI and ...
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2 votes
2 answers
104 views

Trying to understand Integral nonlinearity in DAC/ADC

So here's the definition of INL: it is mentioned (underlined in red) that one of the lines can be a line drawn between the end points of the transfer function but in (a) that line appears to pass in ...
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Measuring 3-phase voltage up to 480V using Arduino/ADC

In order to calculate true RMS phase-phase voltage of a 3-phase delta 3-wire industrial utility, I have been using Zettler Magnetics AHI02516 as step-down/isolation transformers, along with some ...
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