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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Is there an ADC with a finite bound on measurement time

Most interfaces to ADCs (analog to digital converters) look like the following: Start the ADC and wait for it to finish the measurement. Buridan's principle [1] says that a discrete decision based on ...
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1answer
34 views

Solar power monitoring with Raspberry Pi

I want to measure the current and voltage from a set of small solar panels (about 10V and 100mA but not settled yet) using a Raspberry Pi. There will be between 4 and 6 panels. This project will ...
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0answers
31 views

Converting a bipolar signal using an ADC [duplicate]

I want to convert a signal having amplitude +1V to -1V using an ADC in single ended mode. But I am not sure how to use a bipolar signal as input to an ADC in single ended configuration. How can I do ...
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1answer
72 views

Reading a gas sensor with range from 0 to 60mV with an ADC

I need to take a reading using an ATmega328P of a gas sensor. The ATmega328p has a built in 10bit ADC giving only 1024 'steps' The data sheets for my O2 sensor are: ...
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4answers
72 views

How to select ADC resolution, considering input signal SNR and digital signal processing?

What I knew: The ADC resolution selection depends on the ADC inherent noise and input signal SNR. Our application: Very high precision measurement of signals ranging 1kHz to 10kHz. We want to get as ...
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2answers
101 views

Inconsistency of ADC output

I am having an issue with my ADC output. I am using: 12-bit ADC integrated in a MCU 3.3V voltage reference. Power supply of MCU, ADC and ADC voltage reference sharing the same voltage rail(3.3V) ...
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69 views

LM339 : why output +5V

This circuit diagram below is given in my book ( written by Coughlin and Driscoll ) . simulate this circuit – Schematic created using CircuitLab Here it is said that at this condition ...
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2answers
49 views

Trade offs between adc range and amplifier gain design

Edited on 15th,Aug Tradoffs between ADC range and amplifier gain If I want to measure a very small signal with 16 bit ADCs,say 10kHz sine waves with amplitude ranging from 0 to 1uV, I have to ...
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1answer
100 views

ADC Reading is much lower than expected

I am using a EFM32GG990 microprocessor and I am trying to get it to read a voltage using it's on-board ADC. I have made a circuit that I wish it to measure, both the loaded and open circuit voltage ...
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49 views

STM32 ADC sampling problem

I'm using the STM32F2 microcontroller, and have a weird problem with the ADC. Seems like the ADC sampling circuit needs a reset to take a sample, as the ADC value quickly drops after the reset. For ...
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2answers
49 views

FIR filter output result Interpretation While input is taken from ADC161S626: 16 bit

I have implemented a 20 order FIR Low pass filter, 1000 HZ cutoff frequency on Sparten - 6 FPGA. First I calculate the coefficients in Matlab, Then I directly put them in vhdl code. Here are my ...
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2answers
190 views

calculating a burden resistor for a current transformer

Background: I follow a reference design for a single phase power meter (230V, max 3A). The below circuit is to measure current via a current transformer. a CT will be connected to...
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1answer
36 views

Can an ADS1231 be used in place of an ADS1115?

I have a working millivolt recording device which uses the ADS1115 16-bit adc. I would like to move up in resolution to the ADS1231 which is 24-bit. The Ads1115 is described as an i2c-compatible ...
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2answers
199 views

High frequency, low noise clamp circuit

I have an analog circuit that outputs voltage between 0-5V. A simple representative circuit is given below. The ADC can tolerate up to 4V and the interesting signal that I like to digitize is ...
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1answer
59 views

Compare optical Sensitivity of two sensors

I have two different sensors. Both have 16-bits ADC, both operate at Vdd = 3V, but their dynamic range is different. One has dynamic range of 50M:1 with gain range of x8 and the other has 500k:1 with ...
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3answers
78 views

ADC with programmable quantization levels

Does anybody know if there are ADCs with programmable threshold levels? The continuous signal is a radar signal which is to be digitized with an ADC with controllable qunatization levels. I am not ...
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1answer
76 views

How to connect the power for VREFSD pin and anlog pin in STM32F3273 (ARM Cortex-M4) for SDADC application?

I have an analog amplifier which is powered at single-supply power and have an analog ground of 1.25V. I want to perform sdadc for my analog output. I am using STM32F373 (48pins), which is an ARM ...
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2answers
95 views

Two analog power planes for same voltage

I'm designing a board with LAN8720 and LPC1768. LPC's ADC and LAN's magnetics connections require analog 3.3V power. Should I separate these two analog power planes with a ferrite as I separate it ...
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1answer
49 views

Differential ADC where input goes below ground rail?

I've been reading up on differential ADCs but haven't quite wrapped my head around them. I'm a hobbyist with no real training, you see. I'm wondering, is it possible to use a differential ADC with ...
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1answer
56 views

ADC analog pin connection

That is my circuit: Input: 400V DC U2_1: LTC1285 (ADC) http://www.farnell.com/datasheets/1575635.pdf U2_2: IL261 (digital isolator) http://www.nve.com/Downloads/il260-1.pdf The circuit behavior ...
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1answer
65 views

I want to attenuate my incoming signal whose value is around ±80V to ±0.8V

I have used this circuit configuration to attenuate the signal. Will this work without clipping the signal? Is there any alternative to this? I have to give signal to ADC as a input whose input ...
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1answer
39 views

Problems connecting differential ADC to SPI chain [duplicate]

I need to connect 3 devices with SPI in a daisy chain configuration.1 master 2 slaves. the first slave is typically connected to the master: SCK-SCK MOSI-MOSI CS-CS The second slave on chain have no ...
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1answer
81 views

STM32F1 Can't I use the internal voltage reference as the ADC reference?

There seems to be a badgap voltage reference built-in in the STM32F1 microcontrollers (on ADCx_IN17). Coming from AVRs it seems to me very strange that it's not possible to use this reference as the ...
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2answers
338 views

Noise at 2^n transitions

I am sampling a video signal from a linear imager. I noticed when the illumination is just at the intensity when the ADC increases by another MSB bit at the output, the noise occurs. That is, when ADC ...
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2answers
101 views

Isolating an analogue input using ADC/DAC

I'm looking into isolating an analogue input coming from field equipment and interfacing to a PLC analogue input module. The input will be of the 4-20mA range (1-5V). There are a few ways to approach ...
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58 views

Microcontroller SPI Using DMA with Seperate Chip Selects

I have a microntroller that has DMA (Direct Memory Access) connected to 4x identical external ADCs. All ADCs use a common conversion clock, and have their sampling synchronized. The ADCs have a data ...
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1answer
112 views

Differential ADC input buffer

I am trying to make 10Mohm of input impedance into a ADC (CS5530). I am planing to use differential input buffer to ADC so I am trying to use TI's document as reference. I tried the one differential ...
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2answers
396 views

What to do with unused analog inputs?

I am working on an application using ATmega328p atmel microcontroller. I started with the 28 PDIP version, but now I want to use the 32 TQFP, which I noticed has 2 extra inputs after compiling my ...
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2answers
104 views

Porting MikroC code to MPLAB for PIC16F1508 adding extra noise to ADC

I decided to start using MPLAB with XC8 after I started reaching the 2k code size limit in MikroC. The problem is that since all the Mikroc libraries are proprietary and there are no libraries ...
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2answers
98 views

How to find the dynamic range of ADC?

I bought a Analog to Digital Converter but did not gave much attention to Dynamic range. The resolution is 12 Bit. Minimum input voltage is 0V and maximum is 5V. The problem is I don't have the ...
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0answers
86 views

Should my external analog input be isolated?

I want to build a device that samples analog signals from various measurement instruments via their analog outputs. The instruments have their own power supply, and all devices are powered from the ...
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1answer
65 views

Quantization levels and SNR

Im' trying to build a big picture of telecommunication and i'm stuck in a topic, related to digital communication. But the problem is that i can't go too deep into the topic because it is imensely ...
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3answers
63 views

Can I switch between two analog references to read signals with different ranges with the ATmega328P?

I want to read two voltages of different ranges with an ATmega328P ADC with the highest resolution possible: The 1st signal varies from 0 to 1V. It's the output of an LM35DZ Temperature Sensor. I ...
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3answers
87 views

Separating Digital GND from Analog GND

I'm connecting CdS photoresitor and ADC (MCP3204) to the RPi. And MCP has DGND and AGND. I am about to connect both GNDs to the GND on RPi's GPIO, naively. Is that problematic if I want to read the ...
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2answers
45 views

Differential Pressure sensing circuit

I'm trying to understand a differential pressure sensing circuit that I have. Have attached rough design sketch as well. Sensor used is "10 INCH-D1-MV-MINI" by Allsensors. Output span is 20mV for 10" ...
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1answer
71 views

Why use an actual lock-in amplifier

Why not just use two ADCs (say GPIB from digital multimeters) and use them to collect the data. Afterward, you can just emulate the LIA by empirically determining the phase offset between the signal ...
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2answers
83 views

Using the raspberry pi to measure multiple electrical circuits

I am looking to use the raspberry pi to measure the power consumption of multiple household electronics and record the information to analyze later on. However, I'm not sure if it's possible to ...
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2answers
89 views

This automated light system is slowing down randomly

A PIR sensor sends input to the AVR (ATmega 32A), when input is received and the ADC (LDR) is below a critical value, PB0 is to go high to switch on a relay. A timer counts seconds so that the relay ...
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1answer
43 views

Sense existing vehicle TPS with AVR ADC

I have an issue sensing the throttle position sensor voltage if the sensor is already being used by the vehicle's own ECM. Namely, the vehicle ECM stops responding to the throttle input after a period ...
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1answer
35 views

Real Time Data Capture System

I would like to build a system which could capture an analogue waveform data in real time. For the basic data acquisition system I can use an ADC to digitise an analogue waveform and store this in a ...
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1answer
78 views

Level Shifting & Amplification

I am trying to design a crane load (Weight) measuring unit using motor current measurement technique. For some reasons we can't use load cells here. Part of schematic I have drawn here An air core ...
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1answer
85 views

Micro Converter with ADC/DAC peripherals

I bumped into an interesting device ADuC841. It seems to be a microcontroller with extensive ADC/DAC peripherals. Since I am not experienced and did not have to use combination of ADCs and DACs, going ...
2
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1answer
81 views

Rise/fall time constrains for ADC?

Does the sampling clock rise/fall times for ADCs matter, or they can be virtually 0 seconds? Can they be slow? In particular, I could not find anything about rise/fall time constrains for AD9235. ...
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1answer
128 views

PIC18f45k20 ADC - always returns zero

I'm trying to read a value from a PIC18f45k20 ADC but I always get a zero. It has to be my config that is wrong but I can't see where. I've checked the data sheet and googled (lots of conflicting info ...
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1answer
94 views

Are 4-wire resistance temperature detectors sensitive to ambient temperature?

We're using a TI LMP90080 as an ADC to read a 4-wire resistance thermal detector (RTD) in the following circuit: The problem we are having is that when the ambient temperature changes, especially ...
2
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2answers
35 views

Internal resitance of a battery and SOC related?

How do you find remaining SOC of a battery, say 12V 100 Ah? Is it possible by monitoring internal resistance of the battery? Or is there any better way (logic wise) used in industries? I'm using an 8 ...
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1answer
124 views

Stuck codes in samples from ADC

I am currently testing a 16-bit DAC and a 18-bit ADC. In many tests I have found the ADC to get "stuck" at codes, especially at the ends of the input range. Both the DAC and ADC operate in bipolar ...
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ADC and Pre-Amp Suggestion for RBpi

I want to receive VLF signals (between 15kHz to 30kHz) with my RBPI. So I can found only this antenna: Miniature Very Low Frequency Antenna ANTM1. This miniature 6 inch long antenna can be ...
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3answers
78 views

Problem with ADC of Atmega16A in differential mode

I am having some problem while using ADC interface of Atmega16A. I want to calculate RMS voltage of the power supply coming to my house(usually 250V, 50Hz) and display it on LCD. I am using the ...
2
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1answer
32 views

Separating a PORT into in/out and getting random nums?

Using ATMega1284 I want to generate a random number from 0-7 (maybe more range). This is the main concern. As long as it "feels" random its fine. And it could resolve the rest of my issues... anyways ...