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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Voltage reference sampled by ADC (12 bit) gives value that is off by more points than other measurements

I am using the TI REF3020 voltage reference (2048mV) in combination with a microcontroller in order to have a reference for voltage measurements. The microcontroller is powered by 5V (5.00V), the ...
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1answer
25 views

Does anyone on here know why a camera's accuracy would drop when you reduce the delay time after the pulses?

I'm using a TSL1401R-LF Linescan Camera that reads in a 1 X 128 array of pixels. Here is the datasheet. When I used 170-microsecond delay the accuracy was pretty high and the camera's outputted values ...
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32 views

Smartphone microphone frequency response, ADC and SNR

I'm trying to find on the web if there's an example of smartphone that records with low quality (which introduces lot of background noise) and an example of phone that records with good quality, maybe ...
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62 views

3.3V ADC protection

I'm using a microphone connected to a TIVA's ADC. The output for the microphone is around 100mV and I used some op-amps to make it work from 0V to 3.3V. However, if the user yell at the microphone, it ...
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1answer
48 views

Tweet-A-Watt ADC Current Conversion [closed]

I am trying to write a report on adafruit tweet-a-watt project using a kill-a-watt. Looking through the python scripts, wrt ADC conversion for current signals, I do not understand how he/she develop ...
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1answer
79 views

ADC continuous conversion STM32F103

I'm facing with a problem regarding continuous acquisition of ADC channel in STM32F103. I use the interrupt at the end of conversion to call a callback function to store the acquired value. The ...
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4answers
319 views

Remove spikes from Load Cell readings

I have developed load indicator interfaced with load cell to display the value of load. The device is to be used in on-line weighing of a bag that is moving over the conveyor. Due to the mechanical ...
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46 views

Measure individual cell voltages in a 111-cell battery stack with differential ADC

I have string of 111 lead acid cells (2V each) connected in series with the stack negative terminal tied to Ground. I have 18 TI F28377S MCU launchpads with differential ADC onboard (6 differential ...
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792 views

4-bit bus address selection via analog input pin: Monte Carlo simulation shows overlapping address values

I designed a small sensor PCB for my master thesis with an ATtiny44 microcontroller. I need about 200 of these boards for my application and 16 are always locally connected to controller board. The ...
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1answer
19 views

Sampling error in Lpc1769's Adc

I am trying to sample sin wave using Lpc1769's Adc. I am sampling signal using adc and send this data to pc using serial port (115200 baud rate). My sampling frequency is 1.5 kHz. When I sample 100 Hz ...
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1answer
30 views

How to use multiple input ports for internal ADC of PIC18F4550?

Is it possible to use setChannel() command to switch between the inputs for the internal ADC of PIC18F4550 at the end of each conversion, e.g. from AN0 to AN1 and back, or register initialisation is ...
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36 views

ADC Conversion Timing Formula vs. True Results

A microcontroller that I am working with has a reference manual with an ADC conversion timing in it. The problem is that the results obtained with the formula always disagree with the actual ...
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1answer
32 views

Sampling circuit for decently high-accuracy ammeter?

I'm thinking about building a monitoring circuit for an existing residential power system. Currently there's a simple ammeter and digital voltmeter in use for some basic monitoring, but nothing fancy. ...
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53 views

SPI interface with MAXIM ADC chips

I'm working specifically with MAX1257 but according to the spec sheets the behavior is consistent across the whole lineup of their I/O extender chips. Here's excerpt from the spec: The MAX1220/...
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1answer
41 views

STM32F107 SPI -> UART maximal transfer rate

I am designing a board with STM32F107 microcontroller and AD7680 ADC. What I need is to read data from ADC, increment sequence number after reading each sample, and send ADC values via UART or USB OTG ...
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2answers
104 views

Internal and external channels of ADC in a microcontroller

I am trying to select a microcontroller for my project. I need four ADC channels to sense various voltages and currents. In the datasheets of μC devices, internal ADC channels and external ADC ...
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2answers
35 views

Considerations for switch mode power supply with microcontroller and sensors [closed]

I'm fairly new to this forum and the entire field of electrical engineering. I have a microcontroller (Atmega328P) project that includes a current sensor and several radios (900Mhz-2.4ghz). It is ...
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4answers
112 views

Display large decimal number using seven segments display [closed]

I have a 8bit value on the output of ADC. I need to show this number on 3 seven segment displays. How to do it? I'm working in Multisim 11.0. You can see a scheme of ADC that I have: Two blue ...
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1answer
56 views

Continuous-conversion vs Single-Conversion mode

I am working with an LSM9DS1 9DOF IMU and was wondering about some of the choices about operating the magnetometer. This is my first time working with an IMU, so I am having some trouble understanding ...
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58 views

How to calculate total ADC error after adjustment/calibration?

I’ve some different ADC channels, extended/standard channels and Precision channels. So far I know should the TUE (total unadjusted error) be calculated like this: \$ TUE = \sqrt{e_{offset}^2 + e_{...
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2answers
26 views

Input buffer on a differential ADC

I am working on a AK5578 ADC, and the datasheet gives the following example for an input buffer : I can't figure out the usefulness of the 10 ohm resistor on output of both opamps. Are they for ...
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1answer
38 views

Lpc1769 Adc Reading Problem

I am trying to use LPC1769's ADC. The ADC is operating at 12 MHz. In the LPC1769, for one conversion, 65 clock cycles are required. It means that for one conversion, 5.41 us are required. I toggle one ...
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2answers
41 views

Differential inputs ADC:

I need to test a differential ADC (with AIN and /AIN). After some tests, I don't understand the behavior. Let's use the AD6644 (taken from this Analog devices document): As shown in the ...
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4answers
104 views

Interfacing Analog signal to FPGA?

Okey, let's try this again. The board I am working with is the Smartfusion2 (M2S010-FG484 package) Starter Kit. Link-> here. My main question is If I can interface an analog signal to a pin of the ...
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1answer
39 views

AYTINYx4 - execute other code during analog conversion

I am using an ATTINY44 in my current project. As I need to do some time sensitive switching I would like to avoid any unnecessary delay. To control another device (not time sensitive) I need to read ...
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1answer
53 views

How to interface Si8902 with ATmega128rfa1?

The ATtmega128rfa1 works as master and Si8902 works as slave that is okay. But when a request is given Si8902 takes 8us to reply back with the ADC data. How can master wait for 8 us. How to ...
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1answer
36 views

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
41 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 conditioner ...
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1answer
49 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
51 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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2answers
223 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
64 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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47 views

STM32 Discovery dev platforms [closed]

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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72 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
37 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
61 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
38 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 ...
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1answer
46 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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2answers
52 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
67 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
57 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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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
78 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
67 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
60 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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0answers
54 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: I'...
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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 ...
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1answer
47 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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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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1answer
31 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 ...