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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Accelerometer output transmitted via Bluetooth [on hold]

I have a project in which I want to send the output of a standard(piezoelectric with analog output) accelerometer via Bluetooth to other devices. The sample rate of the signal that interests me is up ...
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Voltage regulator for MCP3202 [on hold]

I am using MCP3202 for 12 bit ADC conversion and the circuit is working fine(from SPI perspective). The MCP3202 uses VDD and Vref as a common pin (which is a bad thing for 12 bit ADC) and I am looking ...
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What is the value of vref when adc is carried out in stm32f4? [on hold]

As we see in AVR programming for executing an adc we set the bits of admux registers i.e. refs1 and refs0 , the value of these bits determine the vref for adc conversion. so my doubt is what is the ...
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Relation Between 8:1 Mux Signal , Mux Accessing Time & output of Mux

I have asked a question yesterday . Now i have a strange issue. I am working with Beaglebone white in Android platform . I have one external ADC (ADC121C021CIMM - connected through 8:1 Multiplexer ...
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299 views

What does pseudo-differential mean?

I often read the term pseudo-differential when looking for ADCs. I know common differential means that the ADC measures a difference between two of its pins (AN+, AN-). But what is the difference to ...
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135 views

Relation between ADC register value & ADC accessing time?

I don't have any Electronics background.I am Software Engineer. I want to know that is there any relation between accessing the ADC buffers with a time (T ) & the ADC buffer values. I am working ...
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1answer
141 views

Input impedance of PIC32 ADC pin

I want to measure temperature of an oven using a thermocouple. The maximum change in the temperature will be 1oC/s. The amplifier section will already contain a low pass filter, but I want to put an ...
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98 views

Ohmmeter not working as expected

I am trying to build a simple ohmmeter by creating a voltage divider and then using an analog pin on a PIC18F2550 to read the output voltage and determine the ohmic value of one of the resistors. I ...
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24 views

How to choose the best ADC clock?

I am using atmega16, and i need to use ADC feature in my project. As i know that there is a formula to set flag register ADPS2, ADPS1, and ADPS0. Which is it is used for determine the division factor ...
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65 views

Sigma Delta ADC for “quasi-DC” signals

I am designing a \$\Sigma\Delta\$ ADC. Most of the high level specs are already set: order = 2 1 bit quantizer OSR = 256 (or 512 if needed) signal band: 100/200Hz We expect some 16bit output, i.e. ...
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12 bit ADC conversion simple code not working as expected

I posted a couple days ago a couple of functions that I wrote to do 10-bit ADC. the problem is I couldn't figure out what was wrong with my code so I wrote a much simpler single function that does a ...
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Reading ADC using Altera DE2 Board (Beginner)

Question: Would it be possible and feasible for a beginner to use Verilog HDL and an Altera DE2 board to read input from a weight sensor's HX711 ADC (see below), and if so: What kind of data am I ...
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222 views

Measure PIC's own VDD-in voltage with ADC

Processor: PIC18F66K22 Compiler: C18 (XC8 is fine also) I've just made (and succesfully tested) code to measure the voltage on AN4 analog pin. Now I want to try something else, not quite sure if ...
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2answers
264 views

What's the difference between analog range and dynamic range in ADCs?

I'm doing a project for school where we need to select an ADC based on a variety of requirements. Two of these requirements, analog range and dynamic range, seem redundant to me. From what I ...
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78 views

Would oversampling reduce in-band signal noise floor?

I understand that oversampling will reduce quantization noise floor. Would oversampling also reduce the noise floor of the noises in band of interest? *******EDIT 20150320********* The correct ...
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2answers
108 views

ADC Read function not working properly

I am working on a school project where I need to read a bunch of analog values and convert them to digital with PIC16F1788(datasheet). I wrote the function using C and xc8 compiler. The problem is ...
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1answer
35 views

ADC Differential inputs

I am trying to feed a 5V signal to AD7705 which is a 16 bit ADC and expects differential inputs. Do I need to divide my 5V signal using bridge and then feed it to the ADC or can I use it as a single ...
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30 views

ADC ic's for SPI protocol [closed]

I want to know what are the ADC Ic's is suitable for SPI protocol? because i cant find MCP3008 ic in shops? No one having this IC. Thanks.
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36 views

Analog to digital converter question

What is the maximum input frequency that can be applied to a dual slope integrating type analog to digital converter? Is it \$f_{clk}/2^{n+1}\$? or \$f_{clk}/2^n\$? And does the time required to ...
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71 views

Multiplexing analog signal

I want to read 4 analog signals (coming from 4 pH sensor, generally said 16HZ freq.) With one buffer op-amp circuit going into a single ADC channel. Is it possible to achieve this using analog MUX ...
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18 views

What is the lowest sample rate for an ADC to sample Bluetooth IQ data?

I need a little more background to answer properly to this question, but maybe someone here could help me with this. So briefly: if I receive data from a bluetooth IQ demodulator, what should be the ...
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1answer
98 views

Any good microcontroller with highly accurate ADC for voltage and current measurement? [closed]

I have to build up a battery cell(single) monitoring system which can calculate the cell's (single) efficiency which should be atleast 0.1% - 0.5% accurate. The cell would be charged over a couple of ...
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Port A digital output set up on pic16lf1827

I am having difficulty moving my code from port b to port a on pic. I am looking at adc disabling and also comparator disabling, but not having much joy. Anyone see what I'm doing wrong? ...
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37 views

Single-Ended Input operation of Differential ADC

I am looking at purchasing a 14-bit ADC chip (http://www.farnell.com/datasheets/1882573.pdf) for a battery monitoring project that I am working on, and am using a differential amplifier measuring ...
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108 views

OP AMPs : ADC Buffer on voltage divider plus protection

I have been reading lots of threads in the past but I have some questions which are still not clear to me. Please help me out in this! Picture of circuit is attached. So basically I am using ...
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46 views

Calculating the acquisition time of a sample and hold circuit?

I've learning about analog to digital converters. I came to read about the acquisition time of sample and hold circuit. But it confuses me. Can anyone help me to learn how to calculate the acquisition ...
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95 views

PIC - ADC - Negative value? - Wrong settings?

I'm trying to read an analog input with my PIC18F66K22 using ADC. But the supposingly 10-bit value often comes to values like 63.241. I found out that a negative value (printing as unsigned) results ...
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ADC with I2C interface with multiple addresses

I want to connect 31 ADC slaves to a master. The ADCs simply should measure voltage and response its values to the master after request. I thought about using I2C as bus system. The problem is that ...
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40 views

ADS1278 double values

I am recently using a ADS1278 as the ADC of my system. The configuration is Frame-sync, TDM, Fixed for the 8 channels. The mode is high speed (sampling at 64KSPS). The core clock and the serial clock ...
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699 views

Building a short term analog memory. Would this work?

As an engineering student, I'm trying to think of an analog equivalent to a flip-flop. My goal is to have a short term memory of a signal, saturating the transistor being the trigger. Kind of like an ...
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115 views

Should I always put a low-pass filter on an ADC input?

I'm a recent hobbyist EE and new to micro controllers. I've built a test circuit to make measurements with a type K thermocouple, a PT1000 as well as an oxygen sensor. The weak signals go through a ...
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67 views

Reduce voltage by a constant 100mV

For a project I have a digital thermometer which outputs a DC voltage of 100mV at 20 degrees C and 250mV at 50 degrees C, which is the range we're interested in. We're putting that into an Arduino via ...
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MCP3008 alternative

I have some analog devices like LDR, temperature sensors, and other sensors and I want to use the readings of these sensors in my raspberry pi B+ , for that I need an ADC , to convert the analog ...
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Why does this seem like a strange way of connecting a bridge circuit to the ADC?

I was planning to hook up a quarter bridge circuit to the AD7730LBR Analogue to Digital Converter that I bought. I was having a look at a "Load_Cell_Schematic" provided by this webpage (the download ...
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44 views

Using DAC to create reference in a wheatstone bridge for strain gauge?

I am designing a circuit where a microcontroller can measure the load forced upon a load cell with strain gauges, making a half bridge. A traditional Wheatstone bridge looks like this: Resistors ...
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35 views

Calculating the actual ECG Voltage from ADC values in the SHIELD-EKG-EMG by Olimex

I'm using this shield with my arduino to acquire ECG signals https://www.olimex.com/Products/Duino/Shields/SHIELD-EKG-EMG/. I am able to get the waveform in a processing software. Now my problem is ...
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turn on led using external light dependent resistor (LDR) with nios ii and qsys design

I want to use qsys and nios ii to design a system that uses an external ldr to turn on led on an altera fpga.how can i go about this, what are the components i need in my qsys design and how to ...
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Why is a Buffer+RC-combination recommended for driving a SAR ADC analog input?

In various places, e.g. this tutorial video by ti, a circuit like the following is being recommended to drive the analog input of a SAR A/D converter: simulate this circuit – Schematic ...
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Analog input dependent on samples quantity used in averaging

I found this issue using arduino but IMO this relates more to electronic eng. I use pin0 without any pull-up/pull-down/connection. Simplified code: ...
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Connect ground of system A to 1v6 of system B?

I have an embedded system powered by a 3.7V LiPo battery that will be connected to an iPod's headphone out cable. The embedded system will perform some DSP on the iPod's audio out signal and use ...
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42 views

MCP3425 (ADC) problem

I am having problems with this ADC. Here is the datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/22072a.pdf I connected it in Single-Ended Input, so I have 15-bits from 0v (0x0000) to ...
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108 views

HX711 amplifier

I have one of the HX711 ADC devices that I want to use for a weighing application. I've fitted it to a breadboard and used demo firmware to poll the chip for readings. The behaviour is as follows: The ...
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Using Arduino Mega With lots of strain gauges

I was looking for a strain gauge shield for an Arduino Mega. I found this link which I found really useful: http://www.osengr.org/Projects/Load-Cell-Shield/Load-Cell-Shield.html At the bottom of the ...
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124 views

Capturing data at 500MHz

I have an ADC sampling at 500MHz (It is collecting data from an Ultrasound sensor). I need to be able to stream this data to my PC (for the time being - this will be done through a wireless unit). I ...
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44 views

XMega ADC is not working

I am working with ATXMega32D4 and trying to run a ADC Code. The output of the ADC is always pushing the maximum value, incase of a 8bit resolution unsigned mode, the output value is 255. The same ...
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56 views

Calculating output voltage and current of photodiode for input towards ADC

I need to make something that reads brightness value of an LED from voltage output of photodiode. I will be using the following parts: OSRAM OSTAR LE UW E3B datasheet Summary: Forward voltage Vf ...
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2answers
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Decreasing ADC Reference vs. Amplifying signal

I have a sensor interfaced to ADC but the Range I am getting is not enough, so now there are 2 options, Gain up the signal or Reduce ADC Gain. But as I heard it, reducing ADC gain will cause more ...
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Connecting an ADC to external input

I have a 12-bit resolution high speed pipelined ADC on PIC24FJ128GC010 micro-controller. It has an internal input [from an another peripheral internal to the chip]. Now, I would like to add another ...
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STM32F103RB ADC (pics included) strange values for temperature sensor (LM35)

I've connected one battery/2 batteries (GND and A0) and the measuremet displayed on the com26 port is ok. I've connected the LM35 (The LM35 has 1 celsius degree for 10mV measured value) on the VCC and ...
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32 views

What is the Effective Resolution of 7135 ADC

What is the effective resolution of Intersil 7135 based 4.5Digit ADC when we use a Microcontroller based measurement using the BUSY and STROBE Signals? datasheet Data Sheet