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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ADC acquisition time

I need to take one sample of a fast changing signal at exact time with high precision. Slow sample rate ADC's have better accuracy, but I wonder about actual aquisition time - the time at which ADC is ...
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319 views

How to implement a “circuit breaker” for an air cylinder

Basically I have a machine connected to the end of an air cylinder, a paint mixer to be specific. I want to implement some kind of device that won't allow the mixer to be turned on until the air ...
9
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446 views

MCP3424, how to read channels in parallel?

About this question I do not have an electronics engineering background, and this is one of my first challenges with communicating via I2C, and with writing to a register, so please do not assume too ...
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1answer
107 views

how to separate a analog sine wave to positive and negative using ADC and DAC?

I have an AC signal which is 20V peak to peak and has a frequency of 200kHz. I am interested in reading this into an ADC. I am not familiar with how this is done and would like some tips. How do I ...
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36 views

Microcontroller with high-speed, high-resolution ADC? [on hold]

I am looking for a microcontroller with the following specs: ADC ( >=16-bit, >=3 channels, >=200ksps per channel) USB connection I am trouble finding any microcontrollers with these ADC specs. Is ...
2
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2answers
136 views

How can I write high-speed A/D data to an SD card?

I want to use a microcontroller and A/D converter to do some high-frequency (~100 kHz) long-term (minimum of five second buffer, looping until triggered) data logging. It looks like a good way to do ...
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79 views

Twisted pair for long distance voltage measurement

I want to measure the voltage drop across a shunt, but the ADC performing the measurement will be far from the actual shunt - perhaps five meters. I'll need to measure voltage drops across the shunt ...
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1answer
52 views

Input/output for buck-boost converter controller implemented with FPGA

I am trying to implement a voltage controller for a buck-boost converter using FPGA. The control method I'm trying to use is in this paper: www.engr.iupui.edu/~aizadian/index_files/Papers/C-28.pdf ...
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26 views

Arduino Mega ADC error when using PWM

I am building a temperature controller, where I read 16 ADC inputs (thermocouple amplifiers), and at the same time I am using 6 PWM outputs (at 10 Hz). When I am only reading the ADC values, I have ...
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1answer
61 views

the maximum and minimum output voltage of op-amp

my question is a bit specific, I have done the research but I got confused. I am trying to measure the current using current sense resistor and a current sense amplifier INA 210 . my measurements ...
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2answers
49 views

Will EMI strongly affect my sensor reading

I'm using an Arduino to read analog values from my sensor running at 5V using a voltage divider. The sensor contains a force resistive sheet where the resistance of the sheet decreases as force is ...
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24 views

MCP3221 ADC always returns zero in Proteus

I am interfacing PIC18F2320 with MCP3221 ADC over I2C. When I try to read the converted value from ADC, only zeros are returned. I'm using MPLAB libraries. ADC is in A5 address mode. The AIN voltage ...
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1answer
55 views

SPI and ADC timing diagram

I am working with ADC 11040K with 1 kHz (1/1kHz = 1ms conversion time) sampling frequency. I am confused with timing diagram of its data conversion. As you can see the image, which duration is equal ...
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120 views

Probing with Oscilloscope Stops ADC Fluctuation

I've gone back to my constant current project to fix an annoying fluctuation in the required current display. See schematics below. The entire circuit consists of a CCS section with signal outs for ...
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3answers
61 views

How to measure servo potentiometer

What's a reliable method of getting a clean measurement of the potentiometer in a hobby servo? I've modified a servo for directly polling its position by soldering a wire onto its potentiometer's ...
2
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2answers
59 views

Integral non linearity in ADC

I am trying to understand the parameters in an ADC datasheet. The precise parameter being the INL(integral non linearity). Now, I was going through this website INL website. . Now, there is another ...
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2answers
67 views

PT1000 2 wire probe. Can I add third wire?

I'v got 2 wire (81 cm) PT1000 probe which I want to utilize in a project. I would like to use current source and couple of opamps to make the measurement through ADC (uC) just like described here: ...
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2answers
65 views

ADC/DAC module with TCP/IP communication

I have a project: conception and realization of a module that converts Analog to digital signals (A/D converter) and digital to analog signals (D/A converter). To communicate with this module, I will ...
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1answer
61 views

Distributing Ground and Clock Between ADC and FPGA on Separate PCBs

This question is in reference to my previous question where some suggestions were made that went somewhat off-topic. Basically I have a built a system with an FPGA and very sensitive ADC (sensitive ...
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1answer
87 views

Arduino analogread: neighbor pin noise on ADC even with big delay

I'm reading two analog input values (light sensors, with pull-down resistors) on an Arduino MEGA 2560. One pin is supposed to report the value of 0, while another pin is supposed to report a value of ...
3
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1answer
101 views

Changing a signal's DC offset before amplifiter and ADC

I'm trying to feed an audio signal which has around 5v DC bias to an amplifier and then an ADC. the final signal should have 2.5v DC bias. i've mixed things i've learned off forums but i'm still not ...
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35 views

How to determine continuous-time delta-sigma loop filter coefficients?

I want to design a 3rd order CT delta-sigma CIFB modulator having determined a noise transfer function, but I can't grasp details how to do this. I am using the popular Delta-Sigma Toolbox by R. ...
3
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1answer
41 views

Looking for links to projects where video decoders are used as general purpose ADCs

The pricing for high speed ADCs is very high. However, since video decoders are used in just about every flat panel display, and these generally contain a couple of ADCs, their prices are very low. ...
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1answer
53 views

Shifting -5 V to +5 V signal to 0 to +5 V for ADC

I want to convert the output voltage of an ECG (-5 to +5) to 0 - +5 volt for ADC. Should i use Op amp ? What is my problem in this picture? I simulated it in Proteus ... but when input voltage is ...
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84 views

Battery voltage select and ADC measurement (OpAmp + uC)

I need to measure battery voltage which supplies my electronics. Vbat supplies buck-boost DC/DC converter then goes to uC and other ICs (3,3V). I want to use 3x2 goldpins in conjunction with OpAmp to ...
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39 views

74HC4051 Analog multiplexer settling time

I have simple schematic for multiplexing single ADC input to multiple analog inputs, made from LMV934 buffer and 74HC4051 analog multiplexer. The problem is, after selecting desired analog input, ...
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41 views

Sample And Hold Adder

I've been playing around with a sample and hold adder circuit. Essentially, I am trying to sample a sine wave with a sample and hold circuit. I want to take that sample and add it back to the sine ...
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2answers
58 views

Amplify the signal from ACS712 to adc

I am trying to amplify the signal from ACS712 to read it better. The problem is that I am using an 8-bit ADC, and what I want to take measure are things like energy-saving lights, or other things with ...
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1answer
45 views

Sama5d3 fast ADC

I am using Ubuntu 14.04 and the arm-linux-gnueabihf-gcc compiler to compile projects for the sama5d3 explained board and using minicom and zmodem to transfer the compiled source code from the ubuntu ...
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1answer
38 views

I want to know when the AD9235BRUZ-65 outputs data? I cant make sense of the datasheet or find a way to simulate it

I need to know when data is output from the AD9235BRUZ-65 digital pins. I need this to create a type of handshake with a FPGA. Would appreciate any help, thanks. DATASHEET : ...
5
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1answer
88 views

Optimal tradeoff between ADC bit depth and sampling rate

I have a 24-bit ADC sampling at 31250 samples per second. I am collecting these on a wireless device, and sending them in real-time to a PC for recording (and later analysis). My band of interest is ...
4
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3answers
126 views

How to measure temperature of a syrofoam cutter hot wire?

I would like to create a hot wire foam cutter device. The wire material is nichrome, diameter 0.9mm, resistance is about 1.7 Ohm/meter. For best cutting results, I would like to control the ...
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2answers
65 views

PIC 18F: Can A/D (+) Reference voltage exceed Vdd?

I am considering using Pololu's P-Star 25K50 dev board for some simple LiPo cell testers. This board is a complete system with on-board voltage regulator, USB micro-B jack and the Microchip PIC ...
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1answer
44 views

How does an ADC with an unequal split supply work?

I'm having some trouble verifying my thought process for how a differential-input ADC works, especially when done in a case when run off an unequal split supply. I'm hoping to get some clarification ...
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34 views

wheatstone bridge pressure sensor configuration

I'm a student working on a pressure sensor that requires voltage amplification in order to read a 0 to 5V output on an ADC input for a PSoC CY8CKIT-042-BLE pioneer kit. Voltage supply is 5V DC In ...
3
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2answers
345 views

Unexpected resistance on breadboard

My first question on EE, please be kind. :-) I am trying to learn how the ADC works on this Cypress PSoC 4100 board. The circuit in the picture does nothing but power the board, connect it to the ...
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104 views

Voltage translation: 5V to 3.3V analog

I need to translate 0-5V analog signal from CASR 50-NP to 0-3.3V analog signal for the MCU's ADC. I came along Microchip's tip #16 solution. Is this a good practice? Can someone verify my design?
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2answers
104 views

Analog inputs with Intel Edison mini breakout board?

Looking at the schematics of the Intel Edison mini breakout board, there are no pins for analog inputs, e.g. for reading state of a potentiometer. For a hardware workshop based on the mini breakout ...
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85 views

ADC undersampling AND oversampling

I need to accurately measure a narrow band signal (of about 200Hz) centered in a part of spectrum that is many times its band (at about 20kHz). I have only a 12 bit ADC that is relatively fast (5 ...
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1answer
115 views

Rtd Signal Output to 0-5v? [closed]

I have a constant current source and analog input channel but it seems I can not directly read rtd as resolution needs mv levels. I cannot use circuit so is there any product or solution help me to ...
0
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0answers
31 views

MCP3204-B 12 bit ADC Changing Channels

I am currently developing an application that requires changing the channels of the Analog-to-Digital Converters. I'm using two interrupts: one to initiate the interfacing with the ADC and the other ...
0
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2answers
89 views

Arduino's Resolution with Multiple Analog Inputs

Resolution of an analog to digital conversion means the ratio between the maximum value of the measured signal to the number of data point that it can resolve(0-1023). So for Arduino(10-bit) my ...
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1answer
48 views

Normalizing audio signal for ADC input

What is the best way to limit an audio signal for ADC input (to 0V - 3.3V) with out disrupting it harmonically? Ideally, I'd like the conditioned signal entering the ADC to be a signal uniformly ...
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243 views

PIC24F08KL201 - PUMPEN Or Not PUMPEN?

That is the question. Neither the datasheet nor the family reference manual provide any information on this, other than: Register AD1CON3 PUMPEN: Charge Pump Enable bit 1 = Charge pump for switches ...
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72 views

Reduce power supply noise for pH measurement with Arduino module

I'm very new to the intergrated circuits and I'm trying to make a pH sensor with Arduino UNO and a cheap pH module. The pH module is connected to analog input pin of the Arduino. I have to use a DC/DC ...
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70 views

Conditioning a voltage using constant current for an ADC range

I wish to make a set of temperature measurements inside a relatively inaccessible box. The measurements can be made using Pt100 sensors - platinum Resistance Temperature Detectors (RTD) with a ...
0
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1answer
51 views

Measuring voltage window with ADC

I'm working on my own SLA charger that has MCU onboard, can regulate switching DC/DC converter to charge 12V battery in 3 stages and can do temperature correction. Everything is fine except that I ...
0
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1answer
76 views

How to give analog input from 3.5 mm jack to FPGA (Spartan 3e)

I am working on a voice transmission project by using Spartan 3e. My code works just fine. My problem is that I give analogue input to adc side by using a potentiometer and see the changes (as ...
2
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1answer
111 views

opamp instead LDO

I have very tough requirements on noise (sub mV, no 50Hz allowed) and LDO seem to fail in that. The required current is like 20-40mA, so i am thinking about using opamp with reference voltage. Is ...
0
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1answer
45 views

Are there high quality alternatives to Sigma-Delta for Audio

Is Sigma-delta pretty much the only game in town when it comes to ADC in the audio world (min 20-20k frequency response) ? By looking at some of the major players and chip manufacturers like TI, ...