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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OPAx134 Inverting Amplfier
simulate this circuit – Schematic created using CircuitLab
I'm current designing a digital mixer and need some advice on the analog side of the ADC.
We are using a PCM4201 for our ADC. ...
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28 views
2 wire, 2 switch, 2 microcontroller, power & GND
Simplifying the original question: I have two units, both with a microcontroller connected with a 2 wire cable. Unit 1 needs to supply 5V to unit 2. Unit 2 has two switches that can be pressed ...
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46 views
Unexpectedly poor DNL, INL and ENOB on an ADC
I'm currently trying to characterize an MCU and it's peripherals, in particular the on-board ADC. However, running the usual test procedures (i.e. sine wave for ENOB and sawtooth for DNL and INL), I ...
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2answers
48 views
Comparator/NAND/NOR ADC not working properly
simulate this circuit – Schematic created using CircuitLab
I was trying to recreate the following ADC (using comparators or NAND/NOR logic elements) circuit to control a 74HC4514 with a ...
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3answers
43 views
stretching ns analog pulses for digital conversion
Problem statement
in one of my design i need to stretch narrow ns pulses coming from photo diode after TIA stage, if i have to ...
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21 views
MCP391X Series External 24 Bit ADC Software Reset Problem(SPI reading behaves weird) [duplicate]
I have a strange problem and I couldn't find a solution for 1-2 months!!!
In my system I have MCP3919 and MCP3914 24 Bit external ADCs. PWM pin of MCU generates 4MHz clock for ADC main clock. And my ...
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49 views
LM35 connected to ESP8266 - temperature readings 'spike'
simulate this circuit – Schematic created using CircuitLab
I've connected an LM35 to an ESP8266 (first image below). Every 10 mins I read the LM35 output and post the value to ThingSpeak. ...
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72 views
Current sensing at μA accuracy and ADC nonlinearity
Project context
A battery-operated positioning device sends location information through GSM at regular intervals. Between the fixes, the device is in low-power mode. The battery is supposed to last ...
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41 views
Using 4-Channel ADC With FPGA
I am using an ADC084S101 4 Channel 8-bit A/D Converter to sample 4 different analog voltages. The ADC is being driven by a Nexys3 FPGA. I am having issues getting the ADC to cycle through all four ...
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28 views
Data acquisition with noise [closed]
I need you help for choosing the best platform ( FPGA, µC,
DSP or raspberry ...) to implement my system below
The description of the problem is here:
the purpose of the system is to treat a ...
0
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1answer
54 views
ADC for low signal (microvolts)
I am a newbie to electronics
I have a sensor that can provide a range of [400 microvolts - 5 Volts]
I want to transform this signal into Digital so that i can read it on computer, I'm seeking a ...
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1answer
36 views
How to lower volume on microphone input before outputting through headphones? (Using a DSP) [closed]
As part of a senior engineering course, my partner and I decided on tackling the problem of hearing loss in youth, and went with a more preventative approach, trying to reduce the amount of cases ...
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3answers
87 views
Precision voltage divider
Hi guys I'm trying to turn 32 volts into 5v using a voltage divider.
The precision of the device concerns me as because it is fed to an 16-bit analog to digital converter. Could someone provide me a ...
2
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1answer
83 views
Assign I²C address to multiple devices on the same bus
I've got a couple of ADCs on the same I²C bus, which all default to the same address. My first instinct tells me to use an I²C multiplexer like the TCA9544A but that would require sending a byte to ...
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1answer
48 views
Can I requst data too quickly from an I²C ADC?
I'm getting some pretty noisy data from a 12-bit I²C ADC (MAX11617 to be precise). Though it's most likely some very sub-optimal board layout that's introducing a lot of noise to the analog signal, ...
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2answers
73 views
ADC EVAL_AD7984_PMDZ voltage source and signal source sharing common ground
EDIT: (problem definition shortened into 2 sentences)
For anyone using EVAL_AD7984_PMDZ and having troubles to apply -2.5, 0, 7.5 [V] and signal to differential probes, because the voltage source and ...
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1answer
57 views
Better way to divide voltage for input to an ADC DAQ?
I would like to monitor relatively higher voltages (up to 160V) using an ADC type DAQ. Most DAQs that I come across can handle around 5-10V of analog input, requiring the voltage to be divided. Here ...
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2answers
46 views
Analog to digital conversion with variable VCC
I would like to build a circuit of a microcontroller reading an analog accelerometer, without the use of a voltage regulator. The problem would be that the battery's voltage will gradually decrease ...
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27 views
Calculation in sigma delta ADC?
I'm using a 24 bit sigma delta adc with internal reference 0.8 volts,SNDR 80 dB.
max input swing +-500mV.
so I have a following doubts.
1]does this have resolution of 0.8/2^24=4.76*10^-8
so this ...
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1answer
45 views
Is this ADC's data output correct ? (LTC1273BCN) [closed]
Why is the period when the waveform should be 1 going between a 5V and VREF(2.4)?
I have set the ADC as specified in the 'typical application' datasheet(see below).
The two traces represent data ...
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1answer
34 views
Generating Channel Select for Multichannel ADC
I am using a FPGA to control a 4-channel ADC (ADC084S101) to sample four different analog voltages. In order to tell the ADC which channel to sample next, there is a control register that can be ...
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2answers
45 views
AC dimmer- triggering triac using moc3041. lamp always remain on, and does not change its intensity
Below is schematic.
1) Problem is lamp always remains on,even if i haven't provided the Anode A terminal with power through micro controller.
2) Also please explain me the need for R7 resistor.
3) ...
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2answers
57 views
Arduino signal conditioning
I'm doing a project with an Arduino.
I read a voltage from a tachometer connected to a generator.
The nominal max output is 21V at 1000 rpm. The generator is managed so that the maximum tachometer ...
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2answers
38 views
ADC resolution after voltage divider [duplicate]
I am working on a project where I have to monitor Vehicle fuel levels using an ADC of a micro controller. My fuel signal is a 0-12V signal & my 10 bit ADC is 0-3.6V range. I have 2 questions :-
...
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1answer
127 views
How do i measure -50 v to 50 v using At-mega micro-controller
I am working on a project where i require to measure -50 v to 50 v using At-mega micro controller(10 Bit ADC). I have tried voltage divider circuit for the positive side of the voltage range which ...
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31 views
supply adc pin of AVR with higher than recommended max voltage ac
The set up is a differential signal passed into an opamp with +/- 5V supply, then biased to +2.5V, so it's possible that max voltage could dip below 0V and above 5V for super short intervals.
I've ...
4
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3answers
749 views
Single wire USB
I wanted to convert a USB differential signal into one signal, and then send it over one wire, and then restore in back to differential signals at the other end. I wanted to do this for a USB 1.1 ...
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2answers
69 views
Software/Hardware Reset of MCU sometimes makes 24 Bit External ADC conversion goes wrong in Tiva C series
I have a strange problem and I couldn't find a solution for 1-2 month.
In my system I have a Tiva TM4C123GH6PM MCU and external 24 Bit ADC(MCP3919). My PWM pin generates 8MHz clock for ADC main ...
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0answers
56 views
How to light a certain LED based on the value of the potentiometer?
I'm trying to write a program in assembly language that will read the potentiometer as an input and light a certain LED when the potentiometer is reading a certain range of values (i.e. light LED0 ...
0
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0answers
52 views
Level shift and amplify battery voltage for ADC input
I have an 8s LiPo battery (ie 8 x 3.7 V nominal cells, ranging from 25.6 V low capacity to 33.6 V full capacity). This is connected to a motor controller that provides a 5 V regulated supply to my ...
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1answer
36 views
How to determine RC filter cutoff of an ADC reading?
I'm making a circuit where I'm voltage splitting a variable resistor and then sending the input to an ADC pin on an Arduino.
My question is, what frequency should I set a low pass filter for? How do ...
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1answer
29 views
Can I get faster than 33 ksamples/second for A/D on my Netduino Plus 2?
I have a Netduino Plus 2. It looks like if I write a loop doing nothing but sampling one A/D pin 100,000 times, then reporting to the PC via debug statement, I get one report every three seconds or ...
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1answer
29 views
DC LVDT Excitation voltage to NI CompactDAQ
I am currently working on getting reading from an LVDT for a project the present model is the DC LVDT model Omega LD620-25
As per it's datasheet the model requires an excitation voltage of 10-30V and ...
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1answer
18 views
Using PCM1807 with a microphone
I'm new here and I trying to figure out how to work with an ADC. I've read a lot of stuff and I believe that an AD converter it's "very simple" to use. What I mean: Plug the analog source to one side ...
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0answers
33 views
Noise appears in image when IC is cold, disappear once getting hotter
We're using ADDI 7004 to convert signal from CCD to image, but one strange thing we observe is that when the board boots from cold, there are a lot of noise on the image, but once the ADC getting ...
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2answers
145 views
What is the quickest way to read an analogue signal - Arduino / Raspberry Pi + ADC / Arduino + ADC?
I need to sample 50Hz voltage signals from four CT current sensors and compare the waveforms to a voltage signal from the mains (stepped-down and offset for ADC) to accurately measure power ...
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0answers
29 views
using the AD8475 as a single ended output
simulate this circuit – Schematic created using CircuitLab
I am putting together my schematic and I am trying to figure out if I can use the AD8475 as a single ended output buffer. ...
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0answers
50 views
Getting a device work without its internal battery, with cable plugged [duplicate]
I'm trying to modify Sound Blaster E1 a bit. It is a USB ADC, which is essentially an external sound card.
This device was intended to be a portable one, but the problem is that I don't use this ...
0
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1answer
40 views
stm32 f411re ADC + DMA
I would like to measure pin PC1 and compare it to Vref to get current voltage. This code below worked on L152re. I changed pin number, ADC1 address and DMA channel. It measures something but I am sure ...
6
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3answers
143 views
RC filter on ADC voltage reference pins: overkill or necessary?
I've been scouring the web for circuits suitable for reading RTDs using ADCs. In one document from TI it is suggested that the following filter be placed on the inputs of the voltage reference pins ...
0
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1answer
31 views
Force sensor reading values Raspberry Pi [duplicate]
I have this force sensor:
http://www.robofun.ro/docs/2010-10-26-DataSheet-FSR400-Layout2.pdf
I need to connect it to a digitial pin of a Raspberry Pi. In order to do that I want to use a polarized ...
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1answer
54 views
Reading LM35 temperature sensor through long wire
I'm trying to read temperature through long wire, using raspberry pi.
I use mcp3008 that I power using one of my rpi 5V pins.
I use the same 5V pin to operate my LM35 temperature sensor.
The ...
0
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1answer
26 views
Estimating error due to Vref deviation on delta-sigma adc
I am trying to estimate the error caused by deviation on the reference signal for the following 22 bit Delta-Sigma ADC and high precision linear voltage regulator:
...
3
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2answers
68 views
Reading the voltage of an energy harvesting coil using Arduino ADC
Being developed by us is a kinetic energy harvester that harvests energy as its magnets move through a coil. It is our goal to measure the voltage across the coil when the real system is being moved ...
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1answer
68 views
AtMega328p A/D inaccuracy
I'm getting A/D readings from an AtMega328p chip that are about 10% higher than I can read on the input signal with a meter.
I'm measuring room temperature with an LM34CZ Fahrenheit temperature ...
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1answer
58 views
Order analysis, need help
Hi fellow electronics enthusiasts.
I'm currently working on vibration detection machine used to detect unbalance from a rotating shaft, rotating from 300-2500 Hz. I have both the tacho signal ( 1 PPR ...
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2answers
84 views
voltage divider — for detecting higher voltage in ADC
I am working on a BLDC sensorless motor. I need to detect BEMF Zero-cross event.
My Motor is working on 24 Volt power.
Now I need to detect the back E.M.F. As refered in this application note.
My ...
3
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2answers
254 views
How to protect ADC input from reverse polarity?
I want to use an AD7124-8 ADC in a project:
I was wondering how to protect the analogue inputs from reverse polarity. According to the datasheet inputs can tolerate at most 0.05/0.1 volts of reverse ...
3
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3answers
43 views
Finding maximum source impedance for A/D converter (SAM3X8E ARM Cortex-M3)
I would like to find out what is maximum recommended source impedance for A/D converter on Atmel SAM3X8E ARM Cortex-M3 microcontroller.
I tried to follow the example of this excellent answer, which ...
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1answer
73 views
Is there a digital input that registers light? / Can only ADC pins register signals from an LDR?
I have been building a traffic light over the past year as a GCSE project. Initially, what was unique about it was that, the pedestrian interface would light up when it was dark outside. Subsequently, ...
