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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Measuring a potentiometer with noisy power

I need to measure a potentiometer where the voltage supplied is very noisy and cannot be filtered. I run into this a lot in my work, but currently I'm trying to measure a steering angle potentiometer ...
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1answer
71 views

help me with 32-bit ADC [on hold]

I want to use 32-bit ADC, suggest me any uC if there is any otherwise any microprocessor...in short I have simply no idea how to start working with 32 bit ADC help me on that too
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22 views

ESP822 and high speed external ADC

I'm playing with ultrasound signals, and with ultrasound images. Data was acquired using either a Redpitaya board or a bitscope micro. Now, I'm trying to sample my signal at ~2Msps, through bursts: ...
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16 views

Check the ADC internal Atxmega32E5

I am trying to use the ADC internal to the microcontroller Atxmega32E5. Hereafter there is the code for take the converted value from one channel of the ADC. Could you please suggest me an easy way ...
2
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1answer
42 views

FFT Bin Problem with external 24 Bit ADC(FFT bins changing with time)

Currently I am working on one project that includes 24 Bit external MCP3919 and MCP3914 ADCs and Tiva C series 32 Bit MCU. I am trying to calculate harmonic values of input signal. I am using CMSIS ...
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1answer
99 views

convert [-24V,24V] range to [0V,3.3V] range

I need to realise a circuit that converts an analog signal from [-24V,24V] to [0V,3.3V] before sending that signal to an ADC "MCP3208", I found the circuit in the picture above,it works perfectly in ...
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19 views

ADS8322YB Analog to Digital converter

I have problems connecting ADS8322YB Analog to Digital converter in Multisim, can someone show me how to wire it? Thanks in advance
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1answer
29 views

Differential ADC has stopped working

I'm using a differential ACD from Microchip called MCP3424 and an ATMega16 to make various measurements. Here is the schematic: http://picul.de/view/HoR Note: I have changed the values of R22 and ...
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1answer
72 views

Not enough digital outputs for SPI slave select lines (CS#)

I have a microcontroller with only 4 digital outputs available and 4 digital inputs. The problem is that I need to communicate with at least 4 SPI devices (ADC's and DAC's). 4 SPI devices means 2 ...
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2answers
38 views

How to Minimally Communicate with an ADS131E04 ADC via SPI

I have bought a few ADCs from http://www.ti.com/product/ADS131E04 and I cannot get hear from them via the SPI. I am putting the ADC in a TQFP socket and I connect the PWDN, RESET, SCLK, CS, DIN, and ...
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1answer
14 views

ad7689 output code differes with vref

so I configured the adc(ad7689) using lpc1768,and here is what i get:(a few conversions of each for the same voltage) VDD=5v,vref=4.096v 4bcf>> v=1.2129 4bdf>> v=1.2139 4b8f>> v=1.2089 but ...
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1answer
19 views

Digital to Analog conversion in Multisim

Here is schematic for Analog to Digital conversion: Here are two Digital to Analog converters in Multisim: Which one should I use? I want to connect it at output of ADC to get original sine ...
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18 views

TIVA C Series to External ADC

That's my very first post here. I'm using a TIVA TM4C1294XL and I also got an external ADC - PCM 1807 also from Texas Instruments. I've never worked with an external ADC before, so I don't even ...
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1answer
20 views

PCM4202 Input buffer

I have a question about the input buffer of the PCM4202 ADC. On page 22 of the PCM4202 datasheet, they describe an input buffer. It's pretty standard with gain and filtering. However, the ADC requires ...
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1answer
44 views

Vref_cal on STM32F3xx ADC

Is there a function to read the Vrefint_cal in Cubes HAL libraries? I'm using the F3xx. I'd like to measure the supply voltage of the micro. The formula given in the reference manual is: ...
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2answers
31 views

Effect of power supply ripple on ADC readings?

I want to use an ADC (AD7124 that is a 24 bit sigma/delta) for 14 bit readings of an external voltage. My power source is a fairly stable 24v DC supply and the ADC runs on 3.3v. I will be using the ...
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0answers
26 views

PIC18F66K80 conflict via ADC (RA0) and initialize ECAN-module

right now i am quite familiar with the can-bus communication via labview and the pic. I startet to merge the pure data acquisition on the pic (e. g. temperature) with the can communication. At this ...
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1answer
81 views

Set ADC input to high impedance

On a early version of the system I'm working on, an Arduino Mega was being used to read some analogue values using its ADC. Something critical to the application was for the ports to be always in high ...
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7 views

raspberry pi 2 is unable to read input from PCF8591 [migrated]

I have wired according to these instructions. http://blog.chrysocome.net/2012/12/i2c-analog-to-digital-converter.html I tried the methods of getting the value at the bottom of the page and it told ...
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2answers
28 views

I2C ADC IC for many components located separately?

my first question in this page :) The sensors I use give analog signals, so I want to translate them all to I2C, but I can't find IC's that allow me to give them any desired address, I find only with ...
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1answer
29 views

Differential ADC - voltage on probes

I got the EVAL_AD9784_PMDZ and Zedboard reading data. It is differential ADC, 2 probes with 1 common ground. The ground is at the ZedBoard GND level (as expected). The voltage input is +7.5, GND, -2.5 ...
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3answers
80 views

Purpose of capacitor and diode in analogue input protection circuit of ADC?

I am analyzing the following circuit used as an analogue input protection for an ADC ( image source: http://www.analog.com/library/analogDialogue/archives/43-04/process_control.html ): I don't ...
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2answers
26 views

Analog to digital converter IC

I want 4 bit digital input for presetting of counter 74ls192.How can I do such task using Analog to digital converter? Is there any specific IC available for 4 bits ADC? Or do i need to design ADC ...
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1answer
30 views

can anyone help me with this part? : ADC81S021

i googled the P/N and can't even find who the manufacturer is and, what i really want, is a spec sheet. it's in a board already, and someone just sent me an iPhone photo of the board schematic. i ...
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64 views

ADC error for low-voltage measurements

The application is high-side current sensing for a battery-operated device. The current drawn from the battery goes through a shunt resistor, the voltage across the resistor is amplified by an INA, ...
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31 views

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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67 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
62 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
91 views

stretching ns analog pulses for digital conversion

Problem statement in one of my design i need to stretch narrow 10 ns pulses coming from photo diode after TIA stage, if i have ...
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22 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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98 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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126 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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57 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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1answer
81 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
39 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
91 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 ...
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1answer
90 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
52 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
78 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
60 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
49 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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30 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
36 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 ...
0
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2answers
62 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
78 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 ...
0
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2answers
45 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 :- ...
3
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1answer
129 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 ...
0
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0answers
35 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
760 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 ...