Questions tagged [adc]

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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LTC2498: different voltage on input and muxout

I am measuring RTD (4-wire connection) with an AD LTC2498 ADC. The ADC responds to commands via SPI, so does return data. The problem is that the voltage at Vn/Vp does not match the one at muxoutpn/...
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High-side 4-20 mA loop protector?

Looking at the MAX14626 4-20 mA loop protector IC, it's shown in the datasheet (Typical Operating Circuit, p. 1) being placed between the transmitter/transducer and an op-amp/ADC. Is there a reason it'...
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Leakage ADC value not accurate for same leakage current

I am trying to understand how this reference design works. This can be found here, Automotive High-Voltage and Isolation Leakage Measurements Reference Design I have simulated it on LTSpice For ...
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Increasing the resolution of a 24 bit ADC over a small voltage range

I am using the Cirrus Logic 24 bit ADC CS5532 in bipolar mode over the range -2V5 to +2V5 to take position measurements for a PID control system. The system is in equilibrium and fully controlled when ...
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Input noise of ADC AD7768 with opamp driver ADA4945-1

I'm operating an ADC AD7768 with an opamp driver ADA4945-1. I measured the noise for three different cases: Both differential inputs open/floating Both differential inputs connected to AGND Both ...
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Flash-ADC: sampling or integrating?

My understanding of a flash-ADC is that it simultaneously compares an input voltage to a ladder of reference voltages using multiple voltage comparators. When used in a fast digitizer, the comparison ...
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ADC (AD7193) SPI communication with multiple devices

I am using an MCU (SAMD21G), to communicate over SPI with an SD card and an AD7193. I have both the SD and the AD7193 on the same SPI bus, each having its own CS pin. My concern is, when reading the ...
2 votes
2 answers
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Electret condenser bias voltage

I have an electret condenser from PUI Audio (https://www.mouser.com/datasheet/2/334/AOM-5024L-HD-R-1219369.pdf). The Vs is recommended to be 3V but my circuit and only supply maximum of 2.5V. The ...
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1 answer
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Battery pack voltage measurement schematic for BQ769x0

The datasheet of the BQ769x0 proposes the following schematic for measuring battery stack voltage. What is the advantage of using two resistor bridges with the N-FET and P-FET instead of just using ...
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Digital and analog supply voltage for amplified half-bridge strain gauge and ADC - MSP430G2995

I am working in a project to extend a pressure transmitter with a second pressure sensor (half-bridge strain gauge). This extension will use an op-amp (MCP6N16T-100) to amplify the signal and a ...
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Best way to transfer indication signal from one STM32 to another STM32 [closed]

This is the system: I need a simple way to pass a signal from the upper controller to the lower controller. The whole purpose is to read an analog voltage, sample it, make statistics, and transfer to ...
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Sample analog signal with stm32 uC

I need to sample an analog signal from sensor that indicates if the camera is in movement - I need to identify if the camera is scanning or stop scanning from any problem and report it to Stm32 uC. ...
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How to use DMA for sampling external ADCs connected in daisy chain and SPI interface with STM32F303?

I use twenty AD7685 ADCs connected in a daisy-chain configuration. They communicate with an STM32F303VCT6 MCU via the SPI interface. I want to trigger DMA to process such an amount of information. So ...
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How to detect if HX711 connected to microcontroller?

I am using raspberry pi pico, HX711 , stepper and RFID. I want to make PCB for it. My system can work with or without HX711. If system has HX711, stepper spins until the weight value of HX711. If ...
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Read parallel data that is valid in falling edge clock NUCLEO-H743ZI2

I have an external ADC with 2 parallel output pins. Each is 1 bit (2 bits total), with clk_out pin. I am trying to read the parallel pins using a NUCLEO-H743ZI2 (480 Mhz). I followed the AN4666 ...
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1 answer
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ACS712 circuitry with STM32F4

I am trying to measure a current of a PV module that can range from 0-15 A. The ASC712 chip can handle current from -20 to 20 A. However, the issue is that to get a current of 15 A, the output voltage ...
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Voltage divider circuit for ADC read

I am going to measure VCC for my project to secure my entire circuit. VCC voltage is too high for the ADC pin of the microcontroller, so I am using a voltage divider circuit. I don't know the purpose ...
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Convert 0-10 V to 0-3.3 V for ADC pin and protect it

in a project I want to convert 0-10 DCV to 0-3.3 DCV and feed it to STM32 microcontroller ADC input pin. also I want some protection on ADC pin. I draw this schematic which I found here in Digi Key. ...
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How to find accurate reference voltage and how to set them to ADCON register of PIC10LF322?

I am a beginner who is interested to learn more about PIC controllers and currently I am working on a small project to turn ON an LED indicator based on the input voltage. I am using PIC10LF322 and I ...
6 votes
2 answers
315 views

ADC injection current effect

The below image is from ST micro document. The document says "A negative injection current on any analog pin (or a closely positioned digital input pin) may introduce leakage current into the ADC ...
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4 answers
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ADC resolution impact with voltage divider

I have a sensor that outputs a signal change between -4 to 4 V. I want to use a bipolar ADC with a 3.3 V reference. I know that I should use a voltage divider, but what is the impact on resolution? I ...
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Measuring UV light with an photodiode - Is my component selection correct?

I have the following circuit to measure the UV A power with an OpAMP, a photodiode and an ADC: I have simulated the circuit in CircuitLab and it looks okay, but I want to hear some additional ...
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ADC throughput calculation

I was studying ADC basics from this document, AVR127: Understanding ADC Parameters. I have a question regarding the throughput calculation. The document reads, Consider the case of single-ended ...
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Using ADC for the first time, not sure how to choose the right ADC

I have a signal from another system that changes between 0-1V. the resolution of measuring will be 3mv. the custom board that I need to design include uC of ST that sample the voltage from adc and ...
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ADC reading on ATtiny13, without dedicated clock?

I am in a design phase of a small circuit which is intended to measure an external voltage, with an ATtiny13. This AVR has a dedicated ADC hardware, which is suitable for my needs (need to detect ...
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How to read analogue value on STM32f401CCU6

So I've just migrated to STM32 Black Pill from my Arduino UNO. I've simply copied the Arduino code into the Black Pill using this method. On my arduino I was using a pressure sensor powered with 5V ...
8 votes
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Input impedance of ADC and reading voltage from voltage divider

I wish to measure a voltage that may vary between 11 V and 15 V with the ADC of an AVR32DA32. I'm using a voltage reference of 2.5 V and picked a 5.1 kΩ and a 820 Ω resistor to create a divider to ...
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Overclocking ADC

Does anyone have experience overclocking an ADC by a small percentage? I have an 80 MHz maximum sampling rate ADC. A new application requires a sampling rate of 82.8 MHz, exceeding the limit by 3.5% ...
3 votes
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Identify chip labelled SC1186E

I am trying to identify the manufacturer and function of, and hopefully locate a data sheet for, this chip labelled SC1186E. It is in a three-phase power meter, so my guess is, that it is an ADC front ...
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3 votes
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Analog to digital scale

Say I have a 2-bit ADC operating on a range [-2 V, +2 V] to make it easy. After the quantization I have a sequence of values [01, 11, 10]. Do these values represent voltage intervals or specific ...
1 vote
2 answers
37 views

ADC protection via single-supply rail amplifier

I'm trying to design an ADC protection circuit in order to measure a few voltages (a USB Bus, a wireless charger output, a battery, etc.) on some GPIO pins limited to 1.8V. There are quite a few other ...
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How can I calculate the 10 bit binary number I have at the output of the ATMEGA328p ADC?

For example, suppose I have an AREF of 2.5 V and a voltage of 0.3V at the A0 input of the microcontroller. How would one calculate the resulting 10-bit binary number at the output
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1 answer
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ADS1115 differential overvoltage protection for three inputs and one reference input

I am trying to protect three separate inputs (A0, A1, and A2 with A3 as reference) of an ADC from an over-voltage of ±10V DC between any of the inputs or the reference (the reference is not grounded ...
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How do I receive data over USB on an STM32F401RE Nucleo board?

I am very new to STM32s. I have been trying to interface a sensor using an STM32F401RE Nucleo board but failing to receive sensor data from the board. I generate 3 clock signals to drive the sensor. I ...
2 votes
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Fast ADC interface with FPGA

I have to interface a fast ADC with an FPGA and then do the data processing. The FPGA used will be Zynq Ultrascale+ RFSoC ZU29DR. I have been given the information that ADC_clk = 4x FPGA_clk. ADC ...
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Contact sensing between a rotating disc and a metal probe

So I'm trying to retrofit an existing PCB to be used for contact sensing. Apparatus: There is a disc rotating at about 9600 rpm. The disc is made out of metal with a coating of diamond dust on top - ...
-1 votes
3 answers
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Truncating leading digital numbers of a voltage [closed]

I would like to as if digitally sample a voltage value and then remove the leading digits in a voltage. For example (truncating the 2 leading digits): ...
4 votes
2 answers
93 views

Rescaling voltage input

Measuring laser transmission with photodetector, I obtain voltage values in the range of [0:9]V. The output of the photodetector is to be observed on oscilloscope and taken as input in ADC of Arduino ...
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5 answers
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Is digitization process without semiconductors an option? (The need for semiconductors in signal digitization)

Please excuse this stupid question, I am a complete humanitarian, but for one of my works I need a detailed answer: is it possible to assemble somehow an analog-to-digital converter (ADC) without ...
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Minimize the quantization error of transducer and DAQ

Can somebody please let me know how to solve this problem: A 12-bit A/D converter has an input range of ± 10 V and is connected to an input amplifier with a programmable gain of 1, 10, 100, or 500. ...
2 votes
2 answers
60 views

Use one chip from multiple daisy-chained ADCs

My PCB consists of multiple ADC chips (AD7685) connected in a daisy-chain mode with STM32F303 as MCU and SPI communication. As far as I know, increase in the number of chips in the system results in ...
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ADC voltage divider calculation issue

I want to measure the input voltage to my circuit. The input voltage is supposed to be anything between 0 to 36 V. The voltage divider is simply a R1 = 100 kΩ on top and R2 = 10 kΩ on the bottom. The ...
0 votes
1 answer
49 views

Differential amplifier with gain < 1

I have a differential signal ±6 V (12 V differential) that I need to condition for an ADC (AD7124) with a 4.096 V reference voltage. Signals of interest are DC-20 kHz. I can make the circuit below ...
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STM32 A/D conversion: Vrefint channel value changes with external channel voltage

I followed the instructions given on this website to get A/D measurements from two channels on my STM32F303. I am using the internal "Vrefint" channel to extrapolate the VDDA power supply ...
4 votes
2 answers
396 views

What is the maximum error of this ADC?

I've read every article on the first two pages of Google trying to understand DNL and INL. Not a single lesson gave a specific example I could relate to, so now I'm still wildly confused and have no ...
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What could be the cause of a constant voltage offset on the STM32L041G6 ADC?

I have been testing the ADC on my STM32L0 with 12-bit resolution and for some reason, every measurement I take has a 0.048 V offset. I've tried a different supply voltage (from 1.8 V to 3.3 V), but ...
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Getting ADC value of potentiometer at a 100 ms sample rate. For the sample, would using a timer for a delay suffice?

I am using the ADC on my HCS12 to get the value of a potentiometer. I am already using a PLL and a prescaler to change the frequency of the clock. Due to the requirements on my board, this value must ...
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1 answer
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ADC parameters confusion

I want to interface an ADC with an FPGA but I'm confused with some basic terminologies. What is the relation between ADC sampling rate and the output data rate of ADC? For example, if ADC sampling ...
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Best way to drive high speed ADC with differential inputs

Currently I am using AD8137 to convert my single ended signal to a differential signal. The ADC I am using is ADC3422 from TI and the data sheet suggests a passive circuit to drive low frequency ...
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What methods can be used for sampling an analog signal using a microcontroller?

I'm in the early stages of design a project I'm working on for fun - a radar speed detector using a simple Doppler radar module and an Arduino (or possibly another similar microcontroller). I've ...
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