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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Interfacing Current shunt monitor with 16bit ADC

I am supposed to high side current measurement via shunt resistor (between source and load) and feed it to the microcontroller. For that purpose i have decided to use this IC MAX9922 which is a ultra ...
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Delta Sigma Converters: Resolution

This question is in reference to my earlier question: Resolution gain in Delta-Sigma Converters What I understand From the answers I inferred that we need the input to have some amount of noise (to ...
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Resolution gain in Delta-Sigma Converters

Suppose I have a two bit quantizer with the following voltage levels: [0 0.2 0.4 0.6]. Thus 0V corresponds to bits 00 and 0.6 to bits 11. Suppose I use this quantizer in a first order delta sigma loop ...
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How can an ADC measure below its resolution?

An ADC's resolution is set by the maximum input voltage divided by 2b where b is the number of bits. In that way, a 16-bit ADC with 20V input can measure a voltage of 20/65536 = 0.3mV (corresponding ...
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32 views

Is programmable gain amplifier(PGA) in ADC enought to get me precision

I have 4 x 3wire load cells from a old weight scale connected as a full-bridge and I want to connect them in my uC ( Atmega328P, but not arduino ). I want to measure weight under these specs: ...
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38 views

ADC speed for precision medical instrument

I am studying a bio-medical instrument where glucose in blood is measured using light reflection principle as shown: Below equation is used to determine glucose level: LED is blinked at fast rate ...
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68 views

ADC conversion using a Datasheet

Is it possible to find a corresponding digital value for an analog current value(Amps) using the ADC component datasheet? If yes, what are the parameters I should consider? Thank you!
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+100

MSP430 program only works during debug mode

I am trying to retrieve the values from the ADC on my MSP430F5529 and send them to my computer over USB, but I am starting small. All I have right now I something that retrieves the ADC value and ...
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50 views

Which ground (digital or analog) measurement components should be connected to?

Good day, I want to measure current and voltage of switching power supply that is on board together with ATMEL AT32UC3L microcontroller. I think I understand how to measure - using resistor divider ...
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46 views

How to check IC chip?

I am currently having problem with the Analog to digital conveter IC ADS1230. It used to work perfectly fine on the PCB, but now I am not getting any data. So I was wondering if there is any method to ...
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35 views

PIC24F: problem in AD1PCFG register

Im working ADC in PIC24FJ64GA002 microcontroller using proteus simulation. I've a doubt regards AD port configuration register. I've connected a potentiometer in AN12 pin and channel was selected. The ...
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29 views

AT90USB646 code 43 error

I needed adc for my project so i built this : It was programmed correctly but when I connect the USB to the PC to use Codevision terminal nothing happens and there is Code 43 usb unrecognised ...
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94 views

Op-amp not amplifying voice from electret microphone

I've tried this schematic (taken from the answer of this question) on my breadboard: Except, i have changed: R1 to 9.4K(4.7K*2 in series); C2 to 47nF; R5 and R6 to 220K; VDD = 3V3; Opamp: LM358 ...
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77 views

High Precision ADC/DAC Circuit Feedback

This is my first proper circuit I've designed and I'm after some advice. I need a 16 bit DAC, output 0-5V and I need to measure the resistance of a thermistor to 0.1mk accuracy. At the moment, I am ...
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59 views

Wrong voltage in op amp circuit to adc

my circuit is not giving me the expected voltage. This is used to measure the current flowing trought the shunt. For example: if I expect 1.3, I get about 1,15V out. Anyone knows what I did wrong? ...
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52 views

I need to sample 8 audio sources at audio quality, what MCU can I use? [closed]

I need to sample 8 audio sources at the same time, at a decent frequency (say, 40Khz). Being only familiar with Arduino, I searched online for tutorials and articles about using interfacing it with ...
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16 views

atmega32 piezo detect knock

I am trying to hookup a piezo sensor to an atmega32 and detect a knock. From the following website I took the example for the connection: https://www.arduino.cc/en/tutorial/knock Except I am not ...
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69 views

How to measure H-Bridge motor voltage using ADC

I am controlling two motors using a double H-bridge controller. I would like to measure the voltage at each motor using ADC's on the microcontroller. The problem is that the motor voltage may be ...
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33 views

Switch Mode power supply and ADC measurements

I've got a controller, measuring on 4 channels, but I see the (~50mVpp)ripple of the power supply, when I oszilloscope the ADC pin. The adc values jump around too. I tried to add an LC filter, but it ...
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44 views

Choosing ADC with wide input voltage range (0-10V)

I faced with the task to measure several inputs (0-10V analog) with galvanic isolation. Using plain Google search (like '0-10V adc') I found several solutions like Linear Technology LTC1854/55/56 ...
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19 views

Connecting a load cell to TIVA C Launchpad

I have a typical 4-wire wheatstone bridge type load-cell. 2 of the 4 wires are for excitation called E+ and E-, while the other two wires are for sensing S+ and S-. The load cells are generally ...
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27 views

Negative input voltage on Isolated Differential ADC

I am trying to interface with negative voltage input signal ranging from -5V~5V or -10V ~ 10V. Since the input signal may be floating or have ground reference, I am planning on galvanically isolating ...
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45 views

Why does this work for biasing an AC signal for A/D conversion

I have a working circuit for biasing the AC signal going into my ADC, but I cant quite wrap my head around why it works. I can see that it resembles a high pass filter but how/why does it add the two ...
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22 views

Interfacing a differential thermocouple pair with ADC

I have a differential thermocouple pair (two K-type thermocouples connected by a common leg) from which I need to sense very small temperature changes between the two thermocouples. Because one ...
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53 views

would using the reference voltage of an ADC as a VOLTAGE SOURCE affect my ADC or the stability of the circuit?

I am using an Arduino to capture an AC signal. However, the application is sensitive and needs a high resolution, I decided to use the internal 1.1 Volt as a voltage reference for the ADC. In the ...
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How to program the ADC10 on an MSP430G2553?

I am currently writing my first serious application with an MSP430 controller (specifically, an MSP430G2553) and I am a bit confused by the documentation as to how I'm supposed to set up the ADC10. I ...
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38 views

Conditioning negative ADC voltage with separate AGND and DGND

I was looking to condition a negative voltage analog input for an ADC and I saw these two posts describing a voltage divider circuit to do so. How do I sample a -2 V to +2 V analog signal with a PIC ...
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75 views

Phase Sequencer

I have 3 phase voltages entering into my PIC ADC (3 different channels ) through a voltage down scaling circuit and I have successfully calculated their rms values inside my controller.Know I want to ...
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36 views

Effects of restricting most significant bits

So i have calculated the settling time for the capacitor C in an RC circuit. The RC circuit is the result of connecting an ADC with a mutiplexer. The ADC is a 12-bit type. In the assignment ...
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63 views

why my DAQ signal is a noisy signal?

background: My goal is to use an Arduino with two proximity probe (sensors) to achieve some output. It is worth mentioning that the output of the proximity probe has two components: DC output that ...
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1answer
60 views

Find settling time of ADC

In an assignment, I need to find the settling Time of the ADC Input Circuit time to reach 1/4 of the LSB. The ADC has 12 bits. I also know that C=12 pF and R=10 kohm. I found a formula that i used ...
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23 views

ADS8361 and F28335

I'm trying to interface an ADS8361 with an F28335. It looks like I have some timing issues when reading the data using the McBSP. I tried to follow the code and the schematics included in this ...
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76 views

Voltmeter scaling resistor front-end and ADC calibration coefficients

I'm designing a voltmeter and current measurement system that forms part of a electronic load. Lets tackle the volt meter first. I'm using a 16-BIT ADC (AD7708) and want to measure the following ...
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Need help to calculate time in an RC circuit with a AD converter and a multiplexer!

I am not sure how to describe this in english, but i will give it a try. I have a unipolar AD converter with Vref=3.3 V and 12 bits. The digital output is d=969 so that gives me the Vin=780.879 mV. ...
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121 views

Measuring an analogue voltage with isolated ground

I am working with a solar EV (car), and I need to measure the throttle pedal signal. The throttle peddle is essentially a 10k ohm pot between 5v and gnd on the motor controller. (0-5V signal). As ...
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50 views

ADC samples half frequency

I'm using a dsPIC33F (Microchip) to sample a 555-timer signal. I've tried square, triangular, and "sinusoidal" signal shapes, but always have the same problem: the ADC samples the waveform correctly, ...
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ATtiny861A: ADC reference voltage should be 1 Volt under AVcc?

I just faced with that ATtiny861A datasheet forcing me to use analog reference voltage to be at least 1 Volt under analog supply voltage: Let me doubt this datasheet statement for two reasons: ...
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39 views

Interfacing ADC with MCU using SCI

I am trying to interface a Texas Instruments (TI) 16-bit ADC to a TI Piccolo microcontroller (MCU) via a serial communication interface (SCI). The ADC block diagram shows 3 connections for this; a ...
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46 views

How to properly measure voltage of external supply

What is the proper way to measure an external supply like a 9V battery which is not connected to the controlling part (micro-controller) of the system. Take an external 1-Channel SAR ADC with SPI ...
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ADC_Read function customized not working

I'm Writing code in C to read ADC voltage for dsPIC30F4013. It is 16-bit Micro-controller. I have initialized all the ADC related control registers and checked my code's working up to acquisition of ...
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140 views

calculate battery voltage using pic ADC

I need to calculate battery voltage using my PIC's ADC. My battery voltage is 24V and ADC has a 12 bit resolution, the PIC operating voltage is 3.3V. I am using the PIC's internal Vref+ and Vref- ...
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137 views

8 bit MCU with 12 bit ADC, possible?

I am trying to measure battery's voltage and current but with a very high accuracy. So i've selected a 12 bit ADC to be interfaced (via I2C) with my micro-controller. My micro-controller will receive ...
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89 views

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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63 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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2answers
127 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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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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108 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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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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63 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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341 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 ...