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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Opamp Noise due to Source Resistance

I want to know total noise I am feeding into ADC and I have learnt about Opamp Noise and resistor noise thanks to this forum. Now I want to know the contribution of resistor in my overall noise due to ...
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54 views

Will the ADC work with resistive inputs in LPC1796

I'm working with LPC1796 and I have to do data acquisition for my project somebody told me that LPC1796 microcontroller won't work with resistive inputs. What is a resistive input? Is there any way ...
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56 views

Platinum RTD temperature sensor choices between 1000ohm and 100ohm

I heard the Platinum RTD temperature sensor are very accurate and I want to use it for my temperature measurement project (-40 degree to 80 degree range). I don't want to use other type sensors. ...
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16 views

Flex sensors and pinoccio Interfacing

So I'm planning to interface these flex sensors https://www.sparkfun.com/products/10264 with a Pinoccio: https://pinocc.io/ Since the onboard ADC accept voltages till 1.6 volt and i need to ...
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40 views

Low-power dual-rail ADC

I am building a battery monitoring device and planning on measuring voltage drop across a current shunt, amplifying, and reading into an external (12-bit) ADC chip to get a value of the resolution I ...
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58 views

What does ADCXX_INYY represent? Configuring ADC on certain pins from STM32F207ZG Board

I have a STM32F207ZG-SK board, and I want to configure pin B0 and A6 to read analog values from another board. Did I do the setup for pin B0 and A6 correctly? I checked to see if it has ADC and it ...
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57 views

Direct interfacing of analog MEMS microphone to microcontroller ADC

I would like to sample the output of an analog MEMS microphone with an ADC embedded in a uC, sampling rate up to 1MHz. I don't care too much about signal quality (as I'm more interested in ambient ...
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39 views

AD620 voltage noise and ADC SNR calculation

I want to calculate theoretically my effective resolution from C8051F350 in-built sigma delta ADC with different interface options like ISL28134, ADA4528, ADA4898, OPA211, mcp6v07. I want to know ...
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60 views

Generating and measuring PWM

Description of the main part of my project: A microcontroller should read 4x PWM channels, that come from a RX1. The frequency of the PWM signal is fixed (about 50Hz), the high time of the pulse is ...
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38 views

Protect ADC - Input HF

I use an 7 GS/s ADC to acquire data with an frequency of 2 GHz. The input range of the device is between -0.35 and 0.35 volts. My signal is also between this range, but sometimes there is a short ...
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1answer
60 views

Calculating mV/g of a sensor

I have constructed a piezo-resistive sensor using graphite. I managed to obtain the output voltage of 0-5V by using the ADC of my Arduino to read the sensor. But I have no idea how to calculate its ...
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186 views

Erratic ADC output

I'm using a 12 bit ADC (MAX1270), SRAM (23LC1024) and PIC18f4550 to measure temperature transient at the output of an RTD. The communication protocol is SPI. The voltage is sampled and sent to PIC, ...
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35 views

Voltage/current Monitoring - MAX4172 + ADC vs. INA219

I'd like to add some monitoring of voltage and current on the +5V and +3.3V supply rails of a development board power supply. I'm currently debating between two approaches. The first approach is to ...
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39 views

dspic33 ADC alternative MUX problem

I'm trying to sample from 8 channels using my dspic33fj128gp802 chip. I've had four channels working fine up until now, but trying to use the alternative MUX switch isn't going to plan. I've tried ...
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2answers
143 views

Is my understanding correct in selecting ADC resolution? (Noise analysis)

I have posted a similar question before: ADC resolution, considering DSP. And finally I think I know the answer. Could you please have a check on it? Here is the set up: The input signal of the ...
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2answers
78 views

Determining Bandwidth of any circuit

I am getting familiar to SNR, noise calculations, thanks to this forum, however I often come across Bandwidth of the system to calculate resistor noise, to get rms noise from nV/rt-Hz, etc. I have a ...
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96 views

Using step-up converter in metering instrument?

I am designing a pressure calibrator (my first Real project), which is supposed to measure from 0-200.00 mmWC (20000 counts) using Silabs C8051F350 (inbuilt 24-bit Sigma delta ADC). Sensor used is a ...
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41 views

MSP430 Low Voltage ADC Input Protection

I'm using the MSP430 SD16_A 16 bit Sigma-Delta ADC (page 843) for bipolar differential ADC measurements in a +/- 0.6V range. While the inputs can handle +3.3V, on the negative side the absolute ...
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2answers
820 views

About the meaning of “oversampling”

Recently, I heard one of my colleague said "the 16-bits ADC is enough for us, we can use 'oversampling' tech...". Finally I figured out this "oversampling tech" means to sample many many cycles (AC ...
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67 views

How does a Successive Aproximation ADC Handle Negative Voltages?

First, apologies for what must seem a simple question to most of you. I do understand the SAR algorithm. And Two's complement representation. My question is algorithmic. When a negative voltage is ...
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2answers
212 views

Anti-aliasing filter closer to amp or ADC?

I'm designing a board with several amplified analog signals being fed into the internal ADC of a PIC DSP (dsPIC33FJ256GP710). Because of the board size/shape restraints, the analog buffers can't sit ...
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1answer
72 views

What is the significance of 8 bits in the context of an ADC0808?

ADC0808 is an 8 bit analog to digital converter. What is the significance of 8 bit? What does it represent? Which capability of IC does it represent?
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101 views

Daisy Chaining ADC Sensors

I'm creating a grid of 200+ pressure sensors and need a clean way to get their values back to the master controller without a mess of wires. To me it seems like daisy chaining all the sensors ...
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55 views

Which resistor watt rating to use for this circuit and Arduino 5V?

http://www.skillbank.co.uk/arduino/measure.htm I am looking to build the circuit this guy recommends for making a better analog reference source. I found the voltage reference diode, and now I am ...
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53 views

Strategy for up to 40 ADC inputs using alert feature

I'm working on a project where I want to monitor 40 phototransistors (IR breaker beams), but without having to constantly poll the ADCs. Ideally I'd want a digital pin pulled when one of the beams is ...
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134 views

ADC implementation

I want to sense the voltage across the resistor R1 (i.e convert it into digital form). I only have comparators available with me and no other hardware (ADC is not available). Is there any way I ...
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70 views

Do batteries have a delay when adjusting to a new load?

So I am creating a battery voltage measure, and it takes a reading both when the battery is in open circuit, and when it is loaded with a 100mA constant current. I have set it up and the reading is ...
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47 views

Globlal Variable Problem: Pic18f4550 and Pickit3 Debugging

I'm working on a project which includes the usage of the A/D converter module in the micro-controller (pic18f4550). I haven't had any problems in the past with the micro-controller using a pickit3 ...
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1answer
107 views

Get temperature via ADC of microcontroller

I want to manipulate the physical value of temperature. Here is the characteristic of this µC: Resolution: 12 bits Supply: 5 V Min Mesure: -45 Max Mesure: 75 Min ADC IN: 0.4 Max ADC IN: 4.8 Here is ...
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47 views

In PIC24 programming, why does AD1PCFGL = 0xFFDF mean assigning analog to AN5?

I know 0xffdf is a hexadecimal number, but why does the instruction AD1PCFGL = 0xFFDF; mean assigning analog to AN5? What has 0xFFDF to do with 5? How are they ...
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1answer
39 views

PLL synchronized ADC sampling

I want to do AC RMS measurement. The input signal is derived from the utility power line, so it's frequency not so stable. So i want to use PLL to synchronize the ADC sample pulses to the input ...
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1answer
36 views

Precise Measurement of Noisy Voltage

I'm working on a circuit that will have a current shunt before a device connected to a truck's 12V system. This system can have voltage drift, and large transients during operation. The connected ...
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73 views

ENOB Calculations

I've been having a discussion with a colleague about ENOB (effective number of bits) calculations for DACs and ADCs. We both come across it from different directions (he being more analog, and me ...
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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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114 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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36 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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118 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
115 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
111 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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93 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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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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110 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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98 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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58 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
346 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
54 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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224 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
63 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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83 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
91 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 ...