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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A/D conversion loop infinitly

I'm quit new one PIC microcontroller, and i'm stuck with a new problem. I was using the A/D converter of my PIC18F46j50 to catch 4 push buttons on 1 PIN (RB2), and it worked well. But since I ...
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51 views

How to figure out how much time you have for writing to flash when voltage source breaks down?

I try to figure out how I can make sure, that my controller (STM32F030K6) is always able to save a 16 bit integer to the flash when the power is breaking down rapidly. This controller has an Analog ...
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78 views

Need to convert 0-10VAC (alternating current) to 0-3.3VDC (direct current)

I am using a sensor that outputs a 0-10 VAC (alternating current) and I need to convert this signal into a signal within 0-3.3VDC (direct current) to feed into an ADC. What is the best way to go ...
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33 views

Design issues with an integrating ADC

I have designed a dual slope integrating ADC on Multisim, but I am having some practical limitations. To switch between the input voltage and the reference voltage, I am using the following switching ...
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73 views

Interfacing ADC CS5532

I've been trying to interface ADC CS5532 to P89V51RD2. I have reset the ADC, written configuration bits to the configuration registers. I am trying to use the single conversion mode. However, while ...
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1answer
53 views

How to make Current to Voltage converter [duplicate]

I am working on level sensor which give output of 4-20 mA. I have to feed output of level sensor to an ADC of a micro-controller, to do so I have to convert it from current to voltage.Voltage range ...
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22 views

ADC DSP system on module [on hold]

At my university we were developing a high-end acquisition system but it took long and it's not yet finished, and low level software (Texas DSP and Xilinx FPGA on OMAP138) was a nightmare. Now, to ...
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52 views

How can I collect data from a hydrophone?

I want to collect data from a hydrophone over a period of days or weeks. Hydrophones are a piezo-electric transducer that output millivolts (thousandths of a volt). A response from a hydrophone might ...
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249 views

Voltage and current measurement of battery Single ended or differential?

I am trying to measure battery's current and voltage for a battery charging/monitoring project. I have read all about current sensing (including high side & low side sensing). And i have decided ...
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53 views

Reference Voltage of ADC - Renesas

Can I connect negative reference Pin of the ADC present in MCU to a potential of 1 or 2 V? I am looking for this because I have a input signal which only drops by 200 to 300 mV max from 3 V. Hence, ...
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31 views

Low Pass filtering in Delta Sigma modulation

I was reading about delta sigma modulators. I read that to make the data more accurate it performs digital low pass filtering on the quantized data. So like, if we have a one bit quantizer which is ...
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3answers
124 views

Arduino Uno reading analog 24v DC signal

Disclaimer: Please be gentle - I'm a newbie with electronics. Overview I have a proprietary 24v DC analog sensor signal that I'm trying to interface with using a Arduino based microcontroller. The ...
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1answer
63 views

Reading and processing 32+ ADC channels at high frequencies

For a project I need to sample 32 or more photoresistors at a time and return an ID and value of the brightest photoresistor over some communication (i2c, serial, etc doesn't really matter to me). I ...
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36 views

DAC interfacing with Atmega128

Hope you are doing well and solving all your problems!!! I am new to hardware programming, facing some difficulties to work with DAC interfacing with Atmega128 board. After searching on internet, ...
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1answer
26 views

AT90USB VCC & GND PINs(Where to where?

Where do I connect these pins?so many wayz in google.Im using P? for programmer pinboxheader and J? is USB porb to send ADC data to PC ...
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1answer
43 views

ADC neglects input voltage (ATMega32)

In the following AVR code, why do I always see the same voltage for all pins of port A? I am using ATMega32. BTW, when I am grounding some pins of port A I do not see any change in the output. It ...
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83 views

How to smooth analog data?

I am trying to read load cells data, but these values are very fluctuating. I have ADS1230 ADC and I had configured it to the internal gain of 128. Four half-bridge load cells are connected in a ...
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1answer
100 views

Why do I have crosstalk in Arduino ADC, despite low source impedance?

I. THE CIRCUIT: Below, an Arduino Due measures voltage signals from two parallel voltage-divider circuits: We want the Due to accurately measure the voltages at the places where it makes contact ...
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33 views

Testing an A-D converter of an ARM microcontroller

all. I am playing around with a development board that is using an ARM microcontroller and was wondering what would be a short and simple way of testing the A-D converter of the microcontroller. I am ...
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35 views

Four Half Bridge Load Sensors outputs highly fluctuating values

I have four half bridge strain gauge load sensors connected in a wheat-stone bridge configuration. I have fed the output of the sensors to the ADC (ADS1230) which is a 20 bit analog to digital ...
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1answer
53 views

Is there any relation of ADC's conversion rate with its current/power requirement?

I'm working on a ADC-AD9266 which gives output at a reference of Data Clock Output (DCO) whose frequency is same as that of ADC conversion rate which also the frequency of Clock. f(clock) = f(DCO) = ...
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65 views

DC motor as rotational speed sensor?

Will spinning a small DC motor work effectively as a rotational speed sensor (by producing voltage)? I'm trying to measure the rotation of a shaft (driven by a trackball) on a shoestring budget. I ...
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1answer
72 views

Measuring AC voltage (0.333vac max) using a 10 bit ADC on Atmel ATMEGA328

new to this so please be kind. want to measure AC current in domestic supplies using an atmel ATMEGA328P chip wit the best resolution possible I need to use the split core current transformer ...
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37 views

ADC specs: fpbw - infinite resistor noise?

I'm trying to compute Johnson resistance noise in a simple resistor circuit. However, since all frequencies contribute equally, I am getting an answer of infinity. It then dawned upon me that the ...
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33 views

obtain the value stored in array

i am working with spartan 3 xc3s5000 and 14 bit adc(lt2255). I am giving a analog signal to adc which is connected to spartan . I want to store the values of samples(sample done by adc of given analog ...
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58 views

Which GND pin do I use on a DAQ?

I'm trying to use an absolute shaft encoder with an NI MyDAQ. I'm powering the encoder using the 5VDC pin on the DAQ. Does the ground pin--AGND vs. DGND--I connect the shaft encoder to matter? I ...
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85 views

How can I maximize the source impedance of the Arduino Due's ADC?

I know that the ADC on the Arduino Due has a clock speed from 1 MHz to 20 MHz. This is given by the data sheet: I want to lower f_ADC to maximize source impedance: I want to slow down the ADC as ...
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29 views

ADC 'ADS1130' Wiring Problem

I am hacking a commercial board which uses ADS1130 for analog to digital conversion. Wiring in commercial board is a bit different than what is specified in datasheet. In commercial board, Pin number ...
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38 views

Low-noise SPDT switch

I need to produce an extremely low noise SPDT switch. This switch will take two different inputs to a single 16 bit ADC. The inputs are 50 ohm BNC outputs from trans-impedance amplifiers. The ...
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28 views

STM32F030 analogue input pin impedance (does value change during conversion period?)

The analogue input pin impedance for the STM32F030 is listed as around 50K in the datasheet. Does this value apply only during the conversion period, or would it be higher when the pin is configured ...
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71 views

Arduino Uno - Analogue Signal Conversion Issues

The output of my Low Noise amplifier is a rough sinewave with a peak-to-peak of 1.7V and is shown in the oscilloscope trace below. I would like to use one of the analog pins on the Uno to perform ...
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56 views

ADC Module Recomendation? [closed]

I am supposed to measure a battery's voltage, current and temperature for a project. And for this purpose i am finding an ADC module which can give me 12bits of resolution. However it should be having ...
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Choice between Pseudo-Differential Unipolar and Pseudo-Differential Bipolar ADC Input

While reading about Pseudo-Differential Inputs for ADCs, I came across the document below from LT. Link : http://cds.linear.com/docs/en/product-selector-card/2PB_sarinputtypesfb.pdf Below are copied ...
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52 views

Monitoring for voltage changes in a 24v control line

I've got a 24VDC logic board that controls 120VAC motors, we interact with the logic board via three-button remotes, and now I'm looking to add remote control and monitoring over our existing network. ...
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70 views

How does this Audio ADC know which rate to sample the audio at

The part under question is PCM1808. This device needs an external system clock on the SCKI pin. From the master device it shall need LRCK, BCK & DOUT. The LRCK chooses the left/right channels. BCK ...
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1answer
57 views

ATmega ADC input channel analog vs digital power

The data sheet of the ATmega48A/PA/88A/PA/168A/PA/328/P states that ADC input channel 5 and 4 use digital power, while ADC input channels 3-0 use analog power. Does this mean that ADC 5 and 4 use Vcc ...
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Sensing current upto 2A w/ high resolution

I'm trying to sense a current that will flow in a motor (current shouldn't exceed 2Amps), and I'd like to have a high resolution on this measurement. I was hoping on using the ACS712, but it says the ...
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57 views

The best way to judge the capacitive and inductive load

I've a ADC sampling system. What I can get from the connected load is the sampled data of the output voltage and output current. I want to know if the load is capacitve or inductive from these datas. ...
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37 views

MKS Type 250E ADC Converter

I am trying to make a Analog-to-Digital Converter for my MKS Type 250E Controller (data sheet). This would be the first time I've every attempted to make an ADC, as the company does not sell any. It ...
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30 views

AdvRef pin setup

I have an MCU Cortex M4 that don't have any internal voltage reference but only external. I need to setup a reference on ADVREF pin. I found different schematics used: Ex. 1: Ex. 2: Ex. 3: ...
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Gain Resolution after delta-sigma (ΔΣ) analog-to-digital converter (ADC)

Is it possible (effective) to do oversampling and apply extra Moving Average Filter with a delta-sigma (ΔΣ) analog-to-digital converter (ADC)? More detailed: The ADC (ADS1258) I chose has an ...
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52 views

how to filter out noise while measuring voltage across H bridge?

I am using a 3 ohm resistor in series with H bridge driver to detect stall current. When it stalls the current shoots upto 200 mA causing a drop of 0.6 V. I am measuring voltage across the H bridge ...
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56 views

ADC pin in MCU how to connect

I want to ask how to correctly connect an ADC pin to an MCU. I've found this two practice in some datasheets: simulate this circuit – Schematic created using CircuitLab Which one is ...
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42 views

ADC on PIC32MX575F512H

I'm trying to adapt the actual circuitry below in order to get the current consumption that comes from the VCC_12 My question is: 1) What value and tolerance should I use for Rsense?
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1answer
29 views

Can I put negative voltage to the signal input of the ADS8317 A/D if I use a sufficiently large series resistor?

The datasheet of the ADS8317 A/D converter shows that it has protection diodes on the signal inputs, which have a VF of 0.35V. The maximum ratings say "Input current to any pin except supply: -20mA to ...
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2answers
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ADC/DAC Calibration?

What are the methods for Calibrating an ADC/ADC ? Is ADC/DAC calibration is done purely in software ? May I know some hardware methods for ADC/DAC calibration.
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Vacillating display with ICL7017

for my first project I decided to make a scale using a load cell, the micro load cell 3133 from Phidgets. I also used an ICL7107 as A/D converter and the op amps are LM358. I used a differential amp ...
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Aluminum electrolytic vs. tantalum capacitor for buffering SAR ADC Ref input

I want to use the ADS8317 16-Bit SAR A/D converter and have read through the datasheet. In there, ti recommend using a low ESR 47µF tantalum capacitor to buffer the reference input. Now, my reference ...
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398 views

Purpose of input resistor in ADC circuit

What is the implication of the 1 Megaohm resistor in the schematics attached? Will I be able to detect the condition of the motor (running, not running, stalled)? Part information: MCU ADC (ADC ...
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high speed ADC interfacing

now I'm pretty lost , recently I've taken it upon myself to try build an oscilloscope for fun. I want to do it with high speed ADCs (unless anyone knows of a better way?) I'm hoping for about ...