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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Sigma-Delta RC Filter

I am using a MSP430F427A to measure the voltage across a current shunt for coulomb counting stage of charge monitoring. Just looking at what kind of filter to put at the input of the SD16 ADC, and the ...
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34 views

ADC outputs random values to constant input

I am using ADC (ADS7822) from TI and I have some strange behaviour with it. Below diagram explains the voltage inputs and connections. I was reading strange values with this setup. I removed ...
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197 views

Using a microcontroller ADC to measure a 4-20mA sensor

Question from a SW Engineer again. I've got a device which is mains powered and outputs a 4-20mA current depending on the flow rate in a pipe. I'd like to measure that flow rate with a ...
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2answers
77 views

Design Decisions for using ADC with no VREF

I was looking at Freescale's KE02 processor family, and the MCU designers made an interesting design decision revolving around the ADC that I can't completely wrap my head around. The KE02 has an ...
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38 views

PIC18F Internal reference

I am currently in the middle of migrating a project from PIC16LF1947 to a PIC18F87K22 as I am in need of extra GPIOS and the PIC18 part fits the bill. There is one thing that is nagging me right now ...
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35 views

SAR vs. Delta-Sigma ADC

I want to digitise a sweep signal. The frequency range is 1-100 Hz and the sweep time is 2 seconds. The amplitude is 4.08 Volts and an offset of 2.04 volts is added. ADC range = 0-4.04 Volts. I am ...
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Program to Generate pwm output varying Dutycycle from Analog Input 0-5V using LPC 2148 ARM [on hold]

i want to generate the pulse based on analog input giving to ADC and convert ADC value to PWM signal using LPC 2148 ARM processor.Please help me with code in c
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48 views

chosing the right Hall effect sensor

For a student project, I need a Hall Effect current sensor. What I am going to do is to charge 8 rechargeable Li-Ion batteries of 3.7 volts in series with 34 volt supply and the buck circuit frequency ...
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70 views

Which one is the better way to feed analog input to my ADC?

I am planning to use an AD7730L analogue to digital converter (ADC) chip, with a quarter bridge circuit. Everything was on the track until I realised something, which indicated that things were ...
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4answers
68 views

Use GPIO to disable voltage divider

I'm using a voltage divider to read the battery level of a wireless sensor platform using STM32L151. I'm shooting to use 20k for R1 and 10k for R2, to be under the 50k limit of the MCU's ADC ...
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51 views

Getting the desired output voltage swing from the op amp output

I am designing a microphone preamplifier circuit. I have used op amp OPA 37 which amplifies the signal coming from the microphone to be used by the ADC. The usable voltage range of ADC is 0-2.5V. I am ...
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ADS1278 Noise level

I have been using ADS1278 TI ADC, after I made the digital side work with my processor, I shorted the + and - of the analog input for a channel to check the noise (used recommended capacitors for ...
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cirrus/wolfson wm8731 - Connecting Analog Input to Codec

I am currently working on an embedded audio processor project based on the stm32f4discovery board and the wm8731 codec from cirrus/wolfson. I was wondering if anyone here is familiar with the codec ...
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46 views

Reading a 1.2V-8.8V Signal into a 5V Arduino Input

An analog DC signal that ranges from 1.2V to 8.8V (from a thermocouple amplifier) is to be read from a input pin on the Arduino that reads 0V to 5V. Other that using a potential divider consisting of ...
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4answers
289 views

Question about 1-bit Analog-to-Digital Converter

I am working on a research project, and for a part of it I have to turn an analog signal into a digital one. Now, electronics is not my forte so I don't know what I am doing and am feeling around in ...
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Using the ADC on Cerebot mx7ck Pic32

I'm looking to use the ADC on the cerebot mx7ck (pic32) dev board to sample 3 input sine waves on three separate channels. However when I run my code, it appears as if I get the same sine wave from ...
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36 views

Reading analogue input using digital GPIO

I'm using soil hygrometer to measure soil moisture. Since I don't have adc I'm using This method. Please tell me how to connect resistor and capacitor along with amount of resistance and capacitance. ...
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AD7745/6 capacitance measurement

I am going to use AD7746 to measure capacitor in ranged 0 - 4pF. Can the resolution be 0.04fF? Finally, I would like to input the result to arduino uno.
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56 views

Use reference voltage as power suppy

I am using MCP3202 which does not have Vref as independent input. The datasheet states that the current consumption is: 550 μA max. active current at 5V Can I ...
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3answers
83 views

Measuring a voltage that is higher than your reference voltage

Question: How to measure an input power rail? Let's say I want to build a circuit that switches in a load that draws 1A from a 5V power rail (that is the supply for the device) and then measures that ...
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1answer
47 views

Low Noise Using Opamp And Photodiode?

I'm building a small sensor setup that is able to measure the transmission of light through a (clouded) solution. I currently have a laser light that shines through the solution and a LDR on the ...
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38 views

ADC amplifier gain dependence on microcontroller operating voltage

I was just curious about how dependent the gain of an internal ADC amplifier of a microcontroller is on the supply voltage? The variation I was thinking is 3.3V instead of the values given at 3V. The ...
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73 views

ADC value conversion

I am getting full scale ADC value from 0 to 16348. i am trying to convert it in 4-20ma and ...
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44 views

Changing ADC clock speed does not change sampling speed [XMega]

I am trying to measure how fast my ADC samples arrive on an XMega128A4U. I have set up a timer and the ADC, and each time I have a result I let the DMA pull the CNT register from the timer and the ...
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80 views

Can 5V be applied to 3.3V “5V tolerant” ADC inputs for indefinite durations?

Can 5V be applied to 3.3V "5V tolerant" ADC inputs for indefinite durations? I'm looking at hardware failure modes, I know the ADC value will be clamped at 3.3V. I just would like to know if I should ...
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27 views

Comparator model suggestion for overvoltage protection circuit

It's a pretty simple circuit. I'm measuring a voltage with an ADC, which has a max input of 5V. The signal I'm measuring goes to the drain of a F12N10L MOSFET. The MOSFET's source is connected to ...
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55 views

Low Pass Filter calculation

I am designing a circuit which reads a analog signal(DC - Response from a photo-diode exposed to tungsten lamp) to a 12 bit ADC. The ADC is MCP3202 running at 1Mhz speed and uses 16 input bits to get ...
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159 views

Inaccurate BandGap measurement

I've followed advice on the web on how to use "bandgap" voltage reference to measure supply voltage, however, the measurements are not as accurate as the ADC can be on an Arduino Mega. On the one ...
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1answer
196 views

Magic number in ADC Pi code

Im trying to measure temperature using PT100. Im using ADC Pi board for that. ADC Pi uses MCP3424(pdf datasheet) A/D converters, and in datasheet I found how to calculate voltage - it is pretty simple ...
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47 views

Testing the ADC interrupt on dsPIC33EP256MC506

I have a Microchip MCLV-2 development board intended for controlling small rating BLDC and PMSM. I am trying to develop a simple program to test the ADC interrupt. Basically, I want the program to ...
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2answers
72 views

Analog vs Digital attenuation for an ADC

I'm designing a digital parametric EQ that will go in front of a high gain guitar amplifier. I want to have the option to boost signals up to 12dB. I plan on implementing this either by attenuating ...
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1answer
61 views

Avr multiple ADC and PWM channels

I've been trying to make a program that would continuously read analog values from 3 different pins and then make a PWM signal corresponding to each of those 3 pins. So basically, 3 output PWM ...
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50 views

Use LM324AN as unity gain amplifier

I am trying to read the voltage coming out of a voltage divider with resistors that could go into the mega ohms on the ADC of my micro-controller. The impedance of the divider is too great for 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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312 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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144 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
161 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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1answer
106 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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39 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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82 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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63 views

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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79 views

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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1answer
252 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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282 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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2answers
85 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
127 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
41 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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34 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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50 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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79 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 ...