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Questions tagged [adc]

An ADC is an Analog to Digital Converter. This device converts analog signals into digital form. It is mainly used by digital circuitry to take analog measurements.

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Project Guidance for developing a paintball trigger test rig [closed]

I am working as an intern on a project for a company designing paintball triggers. We currently use old, very expensive and proprietary PLC architecture for a data logging test rig. My goal is to ...
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Pulse DC reading

I'm trying to read current with INA186 on low-side. The shunt resistor calculations are ok, but the current sensed, comes from a pulse DC signal of a SCR. This SCR is rectifying the output of a power ...
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How to resolve errors in simulating a sigma-delta ADC design in LTspice?

I've been trying to learn how a sigma-delta ADC works. I've been through the block diagram mostly and tried simulating one myself by following this video lecture from "The Signal Path" ...
chethanRaj's user avatar
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Methods For Reducing Output Voltage Of Pressure Sensor Into ADC

I am developing a data acquisition system that takes pressure readings from a pressure sensor. The pressure sensor is a bridge sensor which feeds into a differential ADC. The ADC has an input range of ...
Vera Fodor's user avatar
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How to measure differential gain of two ADCs deducted in software to get CMRR

I have this product g.USBamp where the 16 channels has bipolar mode by software, such that if you say deduct the independent ADC 2 and ADC 3 (not time multiplexed). You will get both differential ...
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Level shifting 7.5-15V range to 0-3.3V range to read on a microcontroller

I have a microcontroller that is meant to read a voltage between 7.5-15 V range. The ADC for the microcontroller is 3.3 V max so I came up with the circuit shown below. It takes in 7.5-15 V input and ...
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CS1237 ADC - series resistor of voltage reference too big?

I've recently tried multiple times to get consistent readings of a loadcell with a CS1237 ADC-module like the following: https://www.androegg.de/shop/cs1237-24-bit-adc-ad-konverter-modul-tl431/ It ...
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Emulating differential and common mode in ADC

A differential op amp amplifies the difference and rejects the common signal. Can you create this effect in ADC (2 or more ADC, not timed multiplexed) and firmware/software by using say channel A and ...
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Selectively Activated External Circuit for ADC Measurement

I'm looking for efficient yet simple-to-integrate solutions where analog signal outside of microcontroller's range is being measured (e.g. 12V power supply) and measurements are done selectively. This ...
lucenzo97's user avatar
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Damaged ATMEGA328P despite clamping diodes and current limiting resistor

I have a custom PCB designed to interface an Arduino Nano's ADC pin that had 12v from a bench power supply inadvertently connected to a header pin meant for 5v input. The ATMEGA328P now gets extremely ...
Robert Susmilch's user avatar
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PCB trace impedances of integrated circuits with high input impedance

There is an ADC front end IC (opamp) at the input of my ADC card and it has high input impedance, What should I set the differential trace impedance to when drawing the PCB? Does this matter much?
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Discrete ADC LDO placement on ADC

I am making a design that includes discrete ADC. I use an LDO to feed the ADC. I also feed the LDO with SMPS. Why did I use LDO before ADC? Because I want to suppress the ripple. That's why I used an ...
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STM32H7 ADC characteristics

I'm working on a setup with a filter and some electronics to get an analog signal ready for a ST microcontroller (STM32H723VG). I want to simulate everything, even the part inside the microcontroller ...
H Ket's user avatar
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How to obtain differential measurements with an ADC

I have a digital scope and it has also differential inputs(+in_Scope and -in_Scope). I always obtain less noisy results using them comparing to and single ended wiring. Here below I draw what I mean: ...
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How to measure the voltage drop of the power supply when a large load (20 amps) is briefly connected for 20 milliseconds (one cycle of the waveform)

I want to measure the peak voltage of 240V AC supply line accurate to (±5%) within one cycle of the supply waveform, i.e. 20 milliseconds. What should be min. sampling rate and the ADC resolution (12 /...
Jitendra Mahapatra's user avatar
2 votes
1 answer
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Unknown 958Hz peak in amplifier/ADC with any input (shorted, opened, signal generator, real signal) [closed]

Update 2: I disconnected the ground between channel 1-4 from channel 5-16 and the 958Hz peak disappears. It could be crosstalk but i wonder why crosstalk can produce 958Hz noise. Update: Using the g....
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What's the influence of the filter roll-off on the delta-sigma modulator?

Understanding Delta-Sigma Data Converters, 2nd edition Different filters with different roll-off slopes and stop-band rejections, how do they influence the delta-sigma modulator? Would the roll-off ...
user71925's user avatar
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Effect of low pass filter in ADC when the pin direction is changed from input to output

Consider a circuit to measure ADC : The ADC pin is changed from input to output every 5 seconds and the pin is read for analog value. Every 5 seconds it is made high for 100 ms, low for 100ms and ...
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ADC(MC3208) Interface Circuit Design

I am currently designing a Multi-ADC PCB for use different sensors, I've researched a range of different sources and would like some clarification on a few things before I finalise my design. I am ...
NDougall32's user avatar
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Interfacing Dual-Channel ADC with Arduino for Wireless Projects

I want to interface a dual-channel ADC (Analog Devices AD4632-16) with an Arduino that offers integrated wireless communication capabilities, such as Bluetooth, BLE, or Wi-Fi. I'm encountering a ...
Morena Fabozzi's user avatar
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SMPS Controller Max Output Voltage

I am designing an SMPS circuit and I am using a ready SMPS controller. In the datasheet, the ADP2303 Datasheet input range is given (3-20V) ± 1.5% output accuracy over temperature Output voltage down ...
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MSP430FR6989 ADC Voltmeter

I am working on a project that converts a ADC signal to display a voltage on my BoosterPack Mk II. My code is working however I would like to display decimal places of the voltage it is reading. Any ...
bsouth26's user avatar
2 votes
3 answers
166 views

Sampling frequency of ADC and maximum frequency of input signal

As pair the datasheet of LTC2207, maximum input frequency can be 700MHz. whereas the sampling frequency is 105MSPS. Two times 700MHz is way less than 105MSPS. So how is this not contradicting with ...
Fateme's user avatar
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Error analysis in analog-to-digital converter (ADC) applications

I was going through this article for learning about ADC error analysis. In Example 1: Applying TUE and Monitoring a Power Supply you can see the below thing: May I know from where that loss equation (...
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STM32 microcontrollers while(1) speed

I did a test on different micros like STM32F0 G030 F103 F401 and STM32H745. I know that various units like NVIC, WIC, DWT etc. take the CPU out of the while loop and the CPU is always busy. But how ...
Mikaeal's user avatar
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Max voltage per pin when measuring differential voltage with MCP3422

Im measuring differential voltage over a 1 Ohm (shunt) resistor at max 1 Amp, load voltage is 12V DC using one of the channels on MCP3422. MCP3422 is powered from 3v3 DC. The datasheet https://ww1....
MarcelH's user avatar
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SPI goes low too fast; Raspberry Pi Pico PIO and ADS7042

I am trying to use an ADS7042 (12-bit ADC) with my Raspberry Pi Pico with the Pico's PIO, but the signal goes low too fast and it seems to have problems going high sometimes, do I need to add some ...
Lucas Rønne Jeppesen's user avatar
2 votes
2 answers
153 views

Best Practices for Preventing Oscillations When Interfacing an ADC with an OPA Output

I'm working on interfacing an ADC with the output of an operational amplifier. To mitigate signal integrity issues, my usual approach includes placing a small resistor near the OPA output and a small ...
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Interfacing ADC12138 with Digital Discovery using SPI

I am trying to interface ADC12138 ADC over SPI channel to Digital Discovery to read the single ended analog voltage in the rang of 0-4V on channel 2. As described in datasheet section 1.0 Snapshot ...
Ronnie's user avatar
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STM32 ADC DMA low raw/Voltage readings

I am experiencing the following problem. When I setup an ADC with DMA for 5 channels, I get lower readings than the expected ones. We have PCBs of the same batch in 3 countries, but only the ones ...
K S's user avatar
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2 votes
2 answers
297 views

Measurement of high voltage

For research lab work, we use a high-voltage generator to create one pulse with a low intensity (< 4 mA). The voltage range is variable from 100 V to 3000 V and the FWHM of the pulse is ~1 ms. The ...
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What is the scope of this circuit? [closed]

I was looking at a schematic block, for an VIn for an ADC and I saw this : What is the possible scope for this block?
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EMF Coupling from microSD writes

Looking for some pointers. I am having an issue with noise coupling into the onboard ADCs while writing to a microSD card. Audio from an pre-amp at 46.875 ksps I am using a SAMD51 microcontroller (...
Julian Blanco's user avatar
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ADS1115 ADC + ESP32 4S battery monitor

I have a project to monitor a 4S battery pack with an ESP32 using an ADS1115 ADC. I have previously tested the circuit witch has been corrected by someone on Stack Exchange. The circuit: I have 2 ...
Khales Naim's user avatar
2 votes
1 answer
52 views

ADS7830 ADC unable to provide meaningful values with 3.3 V external reference

I made a board to read some analog values using an ADS7830 ADC. I wish to use a 3.3 V source as external reference voltage. The schematic and layout are shown below (R6, R7, R14, C4, C5, and C6 ...
Eric Jin's user avatar
1 vote
0 answers
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How to use STM32F1 ADC if input is more than 3.3V?

Datasheet of STM32F103X8 I found the sensor output a voltage ranged 0~5V, which is higher than the ADC port can tolerate with (in STM32F1XX datasheet all ADC ports can only tolerate 3.3V). How to make ...
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STM32H723 ADC3 Hardware Auto-Calibration Behaving Unexpectedly

I am trying to read from the ADC3 module of an STM32H723. ADC1 and ADC2 have been previously set up, although I was using a manually added constant offset rather than the automatic calibration in ...
Joe's user avatar
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STM32 DAC sinewave generation

I generated according to this document two same sine waves (on two pins of the microcontroller DAC). I display them on the oscilloscope and obviously overlap. Now I would like to offset the first one ...
KaleM's user avatar
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NTC interfacing with ADC Do we need a LPF after NTC

I am interfacing an NTC with an ADC present in FS32K146HAT0MLLT .The circuit is given below.I was told to follow the same circuit. This is an automotive environment. I think filter is not required ...
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Data collection board

Im currently working with the DC718C data collection board, and I'm using PScope to collect the data and MATLAB for further processing. I want to know if it's possible to collect more than 131072 ...
Abdel Djaferbey's user avatar
5 votes
3 answers
935 views

Any negative effects of using audio ADC for instrumentation use

Hi what is the negative effects of using an audio ADC in sampling voltages in instrumentation use? I know it blocks low frequency like 10Hz but my application uses 100Hz to 10000Hz with input of ...
Jtl's user avatar
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Why the induced noise is sometimes additive but sometimes works as a constant?

Why sometimes the noise (e.g., induced 50hz hum) is added to a useful signal (thus increasing its 50hz value), but sometimes it works as a noise floor - has a static value and can be overpowered by a ...
Matilda Bentefor's user avatar
2 votes
1 answer
108 views

(AD9361) dBFS and resolution per LSB

I got hard time understanding the definition of dBFS and resolution per LSB. In the AD9361 manual (page 35 of 128), The ADC maximum input (0 dBFS) is 0.625 V peak. However, to avoid compression the ...
Rokai's user avatar
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1 vote
3 answers
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Level-Shifting not working in Instrumentation Amplifier

I want to shift the measured EMG input signal to the positive side to use ADC. I used the REF input of AD8421 to add an offset of 2.5V. I simulated the circuit below from the AD8421 datasheet on ...
Keestu's user avatar
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2 answers
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ADS1115 need negative power supply for negative Vin?

I have a quick question because I don't fully understand the ADS1115 datasheet. Do I need to put -0.2 V in the GND and 3 V in VDD to measure negative value in single-ended?
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Why does ESP32-LyraT-Mini V1.2 use an external ADC for the microphone when ADC is already available in Audio Codec?

Kindly refer to ES8311 audio codec datasheet and ESP32-LyraT-Mini V1.2 Schematic.. In the Lyrat mini board, an external ADC ES7243 is used to sample the audio signal from the microphone but an equally ...
hrithik singla's user avatar
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Why does the ES8374 have 5 pins to receive input from a microphone?

I am using a ES8374 codec for an audio application. I am not able to make out how to connect my analog condenser mic (which has two pins) to the ES8374 mic pins. (Refer to pictures from the datasheet) ...
hrithik singla's user avatar
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dsPIC30F 10 Bit ADC Module. Meaning of the SAMP bit

The documentation (https://ww1.microchip.com/downloads/en/devicedoc/70064e.pdf) is saying about the SAMP bit in the ADCON1 register the following: ...
Buran's user avatar
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2 answers
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LTC 2448 analog input voltage range

I use an LTC2448 ADC for data acquisition, and I noticed that the ADC has a voltage range of -2.5 to 2.5 V, but some of my sensors have a 0 to 3 V or 5 V range. I am giving the ADC a Vref of 5 V, but ...
Computerhero18's user avatar
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3 answers
81 views

High-gain transimpedance amplifier with photodiode not functioning as expected

I am designing a trans-impedance amplifier using a TEMD7000X01 photodiode and an AD8551ARZ op-amp. RF is 100 kΩ, CF is 150 pF, and VCC is +3.3 V. The output of the op-amp is connected to an ADC pin of ...
Mohamed Hamouda's user avatar

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