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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Which is the best way to get 16-channel simultaneous sampling ADC interface with an FPGA (Zedboard)?

I have an application that requires me to measure the amplitude of 16 different one-shot pulses (on 16 different lines) simultaneously with an FPGA (Zedboard). For each pulse, the pulse width would be ...
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26 views

Measuring battery with low power requirement

I am trying to create a low power device, which would work off a LIR2450 or similar coin cell battery. athe device has long periods of sleep with short periods when it performs operation (e.g. reading ...
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59 views

Timing when clocking MCU off of A/D

I'd like to try interfacing a fast (80 MHz) ADC with a microcontroller system. The ADC (ADC12DL080) connects to a buffer flip flop (SN74LVTH162374) which then drives the MCU data pins about 6 cm away ...
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45 views

Asymmetrical output

I was searching for a current sense amplifier for measuring the current between a power supply and a battery i.e high side. I found the INA240A1 (evaluation module here). When I look at the ...
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58 views

How to improve the accuracy of measured ADC voltage in a circuit connected to Vcc

The question is based on the following setup. As depicted there is an IC to measure the real value of the 3.3V supply voltage accurately. The measured value of the 3.3V source is transferred via SPI ...
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41 views

Power measurement on multiple loads

I'm designing a circuit for driving multiple loads (min. 16, up to 64) like the one shown below simulate this circuit – Schematic created using CircuitLab The input source is from a multi-...
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91 views

ADC input filter design for DC input signal

My plan is to use an ADS1115 ADC to read a low impedance 0-5V output signal from a level transducer. The ADC data sheet gives guidance for ADC input filtering. This data sheet, and even other input ...
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26 views

Equivalent time sampling with an ADC

ETS can be used to sample repetitive signals with a high virtual resolution. Lets say we have repititive 1MHz signal we want to sample. This signal can be sampled with ETS. For example a comparator ...
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38 views

Does reference voltage long term drift reset after a power cycle?

I'm building a 16-bit ADC system to measure the analog output of an ASIC and accuracy is of utmost importance. One subcomponent required for any ADC system is the reference voltage. When choosing a ...
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42 views

Generate smooth sine wave from ZYNQ Analog to Digital Converter(ADC)

I have system built on ZYNQ SoC. The ADC of the ZYNQ Soc is fed with 10KHz sine wave and I am getting below wave as the output of ADC. This signal is further processed by further modules. As this ...
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81 views

Why is there a current leak from an Arduino pin?

I designed a DC converter using an Arduino and using the Arduino to read the voltage from a shunt resistor as shown in the schematic: simulate this circuit – Schematic created using CircuitLab ...
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36 views

Hall effect current sensor ACS712 for battery application

I want to measure the current of 12V lead acid battery for charger application. So mostly, I need bidirectional current sensing.The current measurement can be done using shunt resistor or using hall ...
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STM32G4x1 ADC Interrupt/flag when a certain value is encountered?

I am brand new with the STM32 and MCU in general. I am reading from an ADC on a continuous mode with the DMA access to memory. I would like to have some sort of "flag" for when a certain ADC ...
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36 views

dspic33E series ADC Buffer size and Sampling count confusion

I am using dspic33E series microcontroller. The most using peripheral is ADC. So, I go through the ADC Reference manual for dspic33E family microcontrollers from Microchip. In the FRM, they said that, ...
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24 views

Ground layout between two data acquisition boards

I'm designing a two-board data acquisition system for resistive and capacitive environmental sensors. Board 1 hosts the sensors on a mezzanine daughter board (dashed lines) and contains the ADC for ...
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78 views

If I have a signal that switches between 5MHz and 4MHz faster than the sample rate of the ADC on a spectrum analyzer

Basically, what happens if your signal is switching between frequencies faster than the sample rate of the ADC in the spectrum analyzer? I have been curious as to what would happen in this case, would ...
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92 views

ADS1115 ADC input filter - active or passive?

I want to implement an ADC as part of my bachelor's thesis. The datasheet of the ADS1115 show that there is no filtering done by the ADC chip before the multiplexer. As I read here, it is good ...
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65 views

How to create noise on a 5V PCB?

For randomness entropy I think I need some noise. My PCB is powered with 9V battery that's reduced to 5V using 7805 and I have a PIC16F15386 on it. There is little to no noise on the power lines so I ...
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42 views

How to implement `analogRead` (Arduino) on AVR?

I'm trying to implement Pin class in C++ with digitalRead, digitalWrite, ...
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53 views

Is it possible to do an FFT on the output of a 4 bit ADC?

I made a simple 4 bit flash ADC on a breadboard, and I want to run an fft on the output. Is it possible to do an FFT on data that is only 4 bits in resolution.
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How to calculate measurement error in a voltage divider?

I'm trying to calculate the measurement uncertainty of the voltage represented by the ADC in +/- V or % of a voltage measured across R2 of a voltage divider. What would be the general way to tackle ...
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19 views

ADC power plane confusion

I'm working on an ADC design using the ADC12DL080, but I'm a little confused by the datasheet's recommendations for power planes. The device has a 3.3v analog rail, a 3.3v digital rail (which ...
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113 views

questions about up-sampling and moving from slow to fast clock domain in FPGA

I encountered some questions and problems I asked myself lately and hoped I can get a nice lead here before I start reading long articles without even be sure if it's the right way. Let's assume I ...
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28 views

Replacement for a 74ACQ inverter

I'm looking at the datasheet for the TI adc12dl080, it suggests a "quiet" 74ACQ series inverter to complement an output clock signal, presumably to reduce noise coupled into the ADC: ...
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69 views

MCP3461 analog side broken “somehow”?

I am trying to interface with an MCP3461 ADC. I follow the SPI protocol described in the datasheet, and can read the output normally. I use the ADC in continuous conversion mode, 3.3V AVdd/DVdd/Vref ...
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How to transmit sensor data over long distance (30meters) without data loss?

In my project, I am using ph and 2 more sensors, I need to measure ph level of the liquid and display the ph value, the actual problem begins here, the display and sensors are placed in different ...
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Feedback on converting signal from 3.5mm jack to ADC on STM32 Bluepill

I'd like some feedback on my circuit. My goal is to convert an audio signal coming out of my laptop's 3.5mm jack (using a sin generator at max volume gives me about a ±1.5V wave) to digital using the ...
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65 views

Selecting a low cost, compact controller/processor for a custom sensor device

I'm a phd student in aeronautical engineering, and I'm designing a custom sensor device for my research. I've figured out the initial stage of the device, which involves converting the analog signal ...
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38 views

AD7626 interfacing with Zynq or Kintex

I want to connect an AD7626 with a Zynq FPGA or a Kintex. Which bank should I choose? Let say the for case Chosen Zynq FPGA has only HR bank Kintex has HR and HP bank. How should I choose a bank ...
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76 views

why does my STM32L412 ADC never reach its full value?

Im using the ADCs on an STM32L412 but it seems that they never reach their full value - the power is 3.3v and the reference is 3v, but they only ever fill to 3863 and not 4095. Why might this be? I ...
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47 views

Translating Stepper motor driver outputs (A-,A+,B-,B+) back into clk,en,step

I have a rather weird problem that makes it necessary to sense the four wires off of a bipolar stepper motor(A-,A+,B-,B+) and translate them back into the pins that controlled the stepper motor driver ...
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101 views

Will this ADC be able to drive the GPIO inputs of my Jetson Nano?

The Jetson nano Dev Board uses a voltage level translator on the GPIO (TXB0108) to convert from 3v3 to 1v8. (As given in the reference document.) I would like to drive this ADC, the AD7091R-4, to ...
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29 views

Is MOSFET Drain Source resistance always affected by Drain Source Current? Is there an IC which is not?

Im trying to measure the voltage of a variable resistor in a voltage divider setup, where the current for the voltage divider is sourced and sunk through a pair of MOSFETS. I assumed that Rdson (drain ...
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60 views

What if you enable both DMA and Interrupt for a STM32 ADC

Imagine this scenario: You are using a timer driven ADC in DMA mode, nothing special. Now, because you are interested in having a Watchdog, you also enable the ADC Global Interrupt in CubeIDE (...
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79 views

OpAmp with slightly negative supply for ADC input

I would like to discuss a design idea around the supply of OpAmps that drive a ADC cannels of a microcontroller or DSP. Let the ADC be supplied by 3.3V and 0V ("analog" supplies separated ...
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50 views

MCP3561 Configuration registers resetting upon relay activation

I am looking for advice on how to solve a problem I'm encountering with my PCB project. The application involves reading a weight from a cluster of load cells and activating a relay that controls a ...
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How do i amplify a very small voltage between 0 and 20mv for analog input for an ADC input for an MCU (Arduino or similar)

I'm trying to amplify the voltage of a simple DC motor used in reverse as a dynamo to read from the ADC of an arduino but i'm only getting from 0 to 25mv. This does not seem enough to read from the ...
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58 views

Simple FFT with DSP on STM32F407VG: How to interpret results and clear noise

It's my first project with STM32 (board stm32f4-disc1). I'm trying to create a simple spectrum analyzer for analyzing a signal (400-7000Hz, 0-3000 mV). My goal is to catch an event when the signal is ...
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43 views

Slight variation of an LDO output

I'm building a portable measurement device, that internally uses a CMOS sensor hooked up to an ADC converter. It's normally powered from battery, but I also allow it to run when hooked up to USB port (...
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65 views

Is ADC over-voltage protection needed when input isn't external?

In a situation where an ADC is measuring an internal voltage node rather than an external input (where one has little control over input voltage), does one need to implement some over voltage ...
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29 views

Controlled gain connecting input voltages to opamp

Suppose we have a charged capacitor and at time t=0 we close the switch and the capacitor starts discharging. Is there a circuit with an opamp which amplifies it with a controlled gain? I don't want ...
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50 views

What is the “input” being fed into a Delta-Sigma Modulator in a Fractional-N PLL? Are bits needed for a specific resolution at the input or output?

I'm doing some reading into Fractional-N PLL design and I have a bit of conceptual confusion regarding a delta-sigma modulator used to toggle the modulus of a divider. If you're trying for a certain ...
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42 views

STM32f103 ADC 1 strange behavior

I'm currently working on a project which uses the STM32f103c8 blue pill to read analog signals from a 3 current sense amplifiers. I noticed that the values were correct most of the time but would ...
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49 views

Sensitivity of a sensor

I have a current sensor (sensitivity is 22mV/A) which is being used to measure AC current with its time stamp data. I have connected this sensor to an ADC (12 Bits resolution Can somebody please let ...
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95 views

Calculation of maximum input impedance

In the datasheet of the ADC of a microcontroller it was mentioned that: "The maximum recommended impedance for analog sources is 10k." In a high voltage divider circuit such as this, how ...
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69 views

differential ADC full scale signal

I have the ADS4249 differential ADC from Texas Instruments here is the datasheet. On page 55 it says: For a full-scale differential input, each input pin (INP and INM) must swing symmetrically ...
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76 views

digital multimeter display count range

The display counts range is one of the digital multimeter characteristics, we know that a DMM is based on an analog/digital converter. And we know too that each ADC has a resolution nBits. A 16 bits ...
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How to calculate a differential ADCs resolution

I have a differential ADC with two internal reference voltages. The bottom voltage is 1V the top voltage is 3V with a 14bit resolution. I want to calculate the resolution in V. For a single ended ADC ...
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Cross talk issue ADC PIC18F2458 [duplicate]

I have used the following configuration according the data sheet FOSC/32, 12 TAD I still get cross talk, I'm using 3 ADC Channels with USB, and When I use one Channel, other channels get affected I ...
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42 views

Adding bridge rectifier to ADC input

I'm into DIY module-making for modular synthesizers. I came across this stripboard layout from the musician Look Mum No Computer for a module that will take an input signal (usually ±5V range of any ...

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