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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Howe to do a sam3x single channel ADC conversion

I have a Sam3x (Arduino Due hardware, but I don't use the Arduino IDE or libraries, and I don't use the Atmel libraries, just the register interface in sam.h). I have multiple pins configures as ADC ...
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1answer
27 views

Integrating Gefran Linear Potentiometer PY1 with Beaglebone Black

simulate this circuit – Schematic created using CircuitLab I want to connect one Gefran Linear Potentiometer with Beaglebone Black for displacement measurement purpose. The signal ...
0
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1answer
25 views

Nulceo F401-RE ADC sampling Time

I would like to know how many samples I have per second for the ADC and what is its maximum samples per second and can I achieve a sample per 1µs ? Clock : 84Mhz The board is Nucleo F401-RE Here ...
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1answer
45 views

Voltage divider with ADC

simulate this circuit – Schematic created using CircuitLab I am a newbie and this may not be a tough one. I am using Arduino UNO and trying to find the unknown resistance with the above ...
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1answer
49 views

How to reach 20MSPS with a 20 MHz clock in SAR? [on hold]

What does this 20MSPS actually mean? Also, an n-bit SAR ADC takes n+2 clock cycles to complete a calculation, then how will I be able to reach the 20MSPS rate using a 20 MHz clock? I have be given a ...
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161 views

Why do audio op amps require such high rail voltages?

This might be a silly question, but I haven't been able to find it addressed directly anywhere on the internet yet. I also have a handful of related questions in-line, which I hope don't stray too ...
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2answers
56 views

is a Delta Sigma ADC more accurate than a direct conversion ADC

I'm just trying to understand if my thinking is correct here. A "regular" ADC in my mind would have a number of quantization levels. Say 16 bits gives me 65535 levels, if I divide into my input ...
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41 views

STM32 Discovery dev platforms [on hold]

I'm still researching this but though I'd post asking about experiences. Looks like st.com offers a variety of STM32 Discovery dev boards for ARM CPUs to, among other things, play with DSP. But ...
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60 views

fluctuating adc reading

I have a fuel level sensor that varies its resistance from 9.5 ohm(empty) to 155ohm(full). The sensor is powered using 12V battery connected to a 30kVA Generator. The problem is that the level that ...
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1answer
32 views

3 mic sound direction locator solution?

I am building a robot toy. When a sudden surge of sound occurs, I wish to calculate the approx position of the sound source. I am going to place 3 analog mics on the edge of my round shape PCB, each ...
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2answers
51 views

How to make clamping circuit to clamp exactly at 3.3 volts

I am building a circuit that attenuates the signal and sends it to 3.3V ADC, so I need to limit max voltage to 3.3V. After testing out some circuits for clamping the voltage(various schottky or zener ...
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1answer
35 views

ADC Input Problem/Considerations

I'm running an audio signal into an ADC on a teensy 3.1. The teensy then detects the first several harmonics of the signal. I had this project working on a breadboard for a good while and finally got ...
3
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1answer
35 views

In a Delta-Sigma ADC, does noise shaping bring the noise to the signal's frequency?

I'm trying to understand the Delta-Sigma ADC. It is known that it pushes the quantization noise to be in the higher frequencies (noise shaping). Since I don't quite understand how this works, I ...
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0answers
21 views

AD6644: DRY signal incorrect?

I am using a AD6644 ADC. It is pretty simple, I feed it with 2 signals ENCODE and /ENCODE and I should be able to get the DRY signal at the same frequency in order ...
0
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2answers
42 views

Is an ADC with a serial interface slower than a parallel one, both having same sampling rates?

I am trying to interface an adc with an fpga, but I am running out of pins. I wanted to know if I use an ADC with a sampling rate same as the parallel one but with a serial interface , will I be ...
2
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2answers
64 views

Protecting microcontroller from inputs rising faster than Vcc

I have a microcontroller (ATMEGA328) that I'm using to do analog data acquisition. The problem is that I want my ADC values to be referenced to a regulated external source that is ~3V, but that source ...
3
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1answer
48 views

How can any spectral analysis show that Sigma-Delta ADC reduces quantization noise?

Quantization noise refers to the modeling of the difference between an analog signal and its quantized version as an additive noise process. The power of the quantization noise can be calculated by ...
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0answers
12 views

Generating Differential signal from computer by manipulating audacity output

I need to inject a differential signal from a computer into a differential ADC (with several stages of buffers). The setup I am using is: computer - running Audacity with basic sound card then going ...
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1answer
53 views

PAL data with ADC?

Is it possible to receive PAL video data from ADC of STM32 for example ? I made a program which convert analog data to digital data (tested with analog accelerometer). It is the same for PAL video ...
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1answer
57 views

periodic spikes in analog sensor

I am using Arduino duemilanove and a Sharp gp2yoa21 sensor for proximity sensing. Now i will be using it to calculate the distance as well so i need pretty consistent and smooth data. But i observe ...
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2answers
54 views

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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36 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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23 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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117 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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22 views

ADS8322YB Analog to Digital converter [on hold]

I have problems connecting ADS8322YB Analog to Digital converter in Multisim, can someone show me how to wire it? Thanks in advance
0
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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
77 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
39 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
15 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
35 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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23 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
24 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 ...
0
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1answer
61 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: \$ \Large ...
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2answers
44 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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28 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 ...
0
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1answer
90 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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2answers
29 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 ...
0
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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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91 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 ...
0
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2answers
31 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 ...
0
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1answer
31 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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68 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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0answers
72 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 ...
0
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2answers
65 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
93 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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0answers
23 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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1answer
198 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 ...
0
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1answer
85 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 ...
0
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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 ...