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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Compensation of forward voltage drop of a diode - software

In my case I would like to compensate with software a voltage drop over the diode. I have diode RS2J which supplies DC/DC (50mA - 200 mA) converter at this point with resistor divider I would like to ...
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38 views

Low Pass Filter With Hall Effect and ADC Help

Background: I am using the Allegro ACS758KCB-150U hall effect based current sensor, here is the datasheet, I am using it to measure current drawn by 24V motors, between about 20A - 130A. The reason ...
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AC Main measurement IC [migrated]

I need to detect low voltage AC power. Can you please suggest a method using micro controller to achieve this? I have made an attempt at this by converting it to DC, but there is a large fluctuation ...
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2answers
59 views

Analog preprocessing circuit (anti-alias/pre-amp) for driving ADC

Background Similarly to what Jeri Ellsworth did in her C64 Bass Guitar hack I am working on an audio-to-midi converter for my bass guitar. I am also planning to use piezo discs as sensors placed ...
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3answers
62 views

Fast and cheap data aquisition

I need to be able to analyse signals that are 10ns in length. It comes from a PMT (Photomultiplier tube) or an equivalent detector. We need to be able to trigger at a certain signal strength coming ...
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49 views

ADC not working

I am using a MCP3008 ADC connected to the Raspberry Pi SPI pins. MOSI → MOSI, MISO → MISO, CE0 → ~(CS), CLK → SPI_SCLK Input voltage to MCP3008 is 3.3V from the RPi. Vref also ...
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35 views

what do you connect to IN+ and IN- for ADC differential input configuration?

I was trying to understand how to read analog inputs on a raspberry pi. I found this video post and I think I understood how it works. https://www.youtube.com/watch?v=oW0mTwFck_c This video uses a ...
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38 views

inverted input for adc

I am using ADC122S625 (Datasheet: http://www.ti.com/lit/ds/symlink/adc122s625.pdf). The ADC has a differential input per channel. My signal is from a RF devide with 3V peak to peak and 1.5V DC ...
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DDC112 analog to digital converter input strength [closed]

DDC112 is analog to digital converter,capable of sensing photodiode ( analog ) signal even if we connect it directly ( without any amplification of photodiode signal ). But if we connect amplifier ...
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22 views

LPC ADC Freezing on manual conversion

I'm using MDK-ARM V5.10 with an ARM Cortex-M0+ LPC1114 from NXP. I have this code below to read the ADC module: ...
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3answers
370 views

Use Cases for an External ADC

Most Microcontrollers (uC) have an Analog to Digital Converter (ADC) as part of their peripheral set, which is phenomenal as this integrates two components into a single package. These ADCs are ...
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65 views

Earth alternative

I'm designing an industrial machine which is AC motor derived. There are sensitive analog sensors (e.g. Load cell) in the system and in the user's site, Unfortunately earth connection is not ...
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23 views

Compute analog signals as functions of two signals

I would like to hear your opinion with respect to the following architecture for a supposedly easy task. I need to “compute” the value of two voltages depending on two signals. Details: I need to ...
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52 views

Crystal oscillator circuit

I am using following circuit and crystal is connected to XTAL2 and XTAL1 pin as shown below. Following IC is LPC2138, shown in image. I am using ADC chip ( DDC112 ) for A to D conversion. For ADC ...
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60 views

How to interface 1 MSPS ADC with processing module in FPGA?

I have DE1-SoC board which contains 1 MSPS ADC, I am trying to take samples from ADC and process them. ADC Controller clock is 20 MHz and data is available every 16 clock cycles. The module that takes ...
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59 views

Opamp buffer for ADC - single ended signal conditioning

I have a problem with my simulated signal conditioner on Multisim. Input signal 11-13V @ 10KHz MCU ADC input is max 0-3.3V The output of the opamp (B) is slewed compared to the input (A). I have ...
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4answers
116 views

How to select gain for an amplifier before ADC?

The circuit has been simplified as shown in the picture. Signal source is connected with an analog amplifier, which amplifies the ac signal and also raise it by 1.5V to match with the range of the ...
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2answers
48 views

Temperature Sensor Verilog

Hello I have been working on an analog temperature sensor TMP36 and I am trying to get the temperature and display it on the NEXYS3 SSD. I am aware the NEXYS3 does not have an analog pin and I built ...
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75 views

Altera DE2 interfacing with analog sensor

Can Altera GPIO pins read the analog output of a light sensor? The light sensor output is analog and I want the Altera to turn an LED on whenever the signal of the sensor is greater than some specific ...
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50 views

ADC input to raspberry pi - I2C vs I2S

I'm trying to create a microphone array and take readings into a raspberry pi. I'm having an 8 bit ADC connected to the pi via I2C (SCL and SDA pins). I'm able to read samples (0-255) into my pi using ...
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34 views

How to find the resolution of a Integration ADC?

I am working on redesign of a old device. In that a Dual slope Integration ADC is used. I have the value of the fixd time required to Integrate the signal(Ramp Up )(20ms). The Integration ADC is ...
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1answer
70 views

Using one channel from adc (pin connections) [closed]

For a heart rate calculator project by using Basys2 and VHDL, I am trying to connect ADC0808 in order to get 8bit digital output from my pulse sensor's output. However, although I designed the circuit ...
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60 views

Problem with flash ADC design

I am using following: Identical resistance of 1k ohms. For 3 bit flash adc we have (2^3)-1=7; which means we have to use 7 opamps, and 8 resistance. Opamp LM324 (V+ is applied directly form 9V ...
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27 views

DDC112 Analog to Digital converter

In DDC112 Analog to Digital converter, its mentioned that its suitable for Low-level current output devices, such as photosensors, and can be directly connected to its inputs. But to increase analog ...
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1answer
41 views

Can SPI slave work with wrong clockphase setting?

In our prototype board, we have one 16-bit SPI based ADC [ad 7798] and an SPI based switch [adg1414]. Though some other guy has written the driver for it, and its also working. However when I ...
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The relation between acquisition time and clock in ADC output?

This is a question that happened to arise in my mind while experimenting on hardware.I was working on pic18f26j50 which falls under the advanced 8 bit controller family from microchip. They provide 12 ...
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185 views

How to sense current with OPAMP?

I want to sense the current that battery supplies to the low current (few mA) circuit. As everyone said before, forcing discrete design does not make sense, so I decided to apply simple OPAMP & ...
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1answer
46 views

Current Sensing with ACS712 on Beaglebone Black

I am planning to use my BBB to perform some current sensing and was wanting to use the ACS712 chip. The chip operates off of 5V, but the analog inputs of the BBB have a max of 1.8V. How can I wire ...
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67 views

Accuracy of RMS of sine measured from N samples of ADC conversion

I am sampling a pure sine wave for 1mS at 200nS conversion rate over a 12 bit range, getting 5000 samples. I need to know how accurately I can determine the RMS value of the sine wave. More generally, ...
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1answer
115 views

Why not use audio codec chip as measurement ADC/DAC?

I am working on a project that needs simultaneous ADC/DAC. The specs of the on-board ADC in typical microcontrollers are pretty weak, and separate ADC with good specs are much more expensive than ...
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2answers
72 views

Long term effect of over-voltage on clamping diodes and ADC reference voltage

I am contemplating building a small voltage/current monitoring circuit that needs to monitor a wide range of voltages and currents. Currents will just be a single low-side shunt. Monitoring will be ...
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2answers
75 views

Pass DC through (passive) highpass filter?

Background: I'm a student, working on my final year project. I am designing a front end for a software defined radio. We have an IF frequency at 36Mz (and a BW ~8MHz). We are bandpass sampling this ...
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39 views

Anyone familiar with TI's ADS1210

I'm trying the build a two-channel thermometer using an ATMEGA328 and two ADS1210. I've connected both ADS1210 via the common SPI lines (SCLK, MOSI, MISO) to the ATMEGA328, for DRDY and CS I'm using ...
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43 views

Converting analog stereo to digital stereo

Analog stereo has two channels. One for every speaker. Now, when can sample and convert the two streams of data from analog to digital. But the problem, is what we will have is two streams of digital ...
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34 views

Sigma Delta ADC code fluctuation

I am designing a precision Pressure calibrator using C8051F350 MCu with inbuilt 24 bit Sigma-Delta ADC(I need only 16 bit performance). I have interfaced my sensor's differential output directly to ...
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79 views

Non-stop ADC for full quantization of arbitrary time period signal average. Do ADCs work like this?

Lets say I have a light intensity sensor and I want to measure the exact average light intensity for one hour using an ADC sampling time that is much less than the input signal frequency. Lets also ...
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What are the units of the output of an ADC?

How would you write or label the output of an analog-to-digital-conversion? I don't seem to have a good grasp for the english when I try to write this out. counts? arbitrary units? For example, if ...
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103 views

About ADC's 'No missing code'

Some 16 bit ADC's specifications has "No missing code: 14 bits min", like ADI's AD7656. I want to know where the 14 bits locate in the 16 bits. Does it mean the high 14 bits? According to the ...
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35 views

Calculating resistor values in R 2R derived circuit?

I am designing an audio effect to try to create that digital lo-fi effect, by using 2 quad op amps in a flash ADC configuration and then doing a R 2R DAC on it. Since I do not want to use no ...
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135 views

ATMEGA328p ADC keeps returning 1023

I'm trying to configure my ATMEGA328p to measure temperature using the TMP36GZ temperature sensor. However, the 10-bit ADC keeps returning 1023. I've tried disconnecting the temperature sensor (it ...
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261 views

How many alternatives does a 14-bit ADC have

I am a bit confused what alternatives are or how to find out how many are in an ADC. The book I have wasn't much help and I need to find this out for a project. Does anyone know the answer or how to ...
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STM32 ADC: Multiple channels with different sampling rates

I am trying to figure out how the STM32 multiple channels ADC conversion works (regular group). Lets say I want to convert on two channels, channel 1 and channel 2, on ADC1 and the sampling rates are ...
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65 views

PIC12F ADC conversion has an unwanted offset

The current setup is shown below. PIC12F1822 with a 10-bit ADC. I'm using a 250R 0.05% precision resistor to get a nice 0-5V input to the analogue pin (AN2 if it matters). As far as I can tell I ...
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Breadboard with high frequency digital signals

I'm trying to interface an ADC chip with my FPGA. The ADC is on a breakout board that fits nicely into my breadboard (.1" pin spacing). The clock input from my FPGA into the breakout board is 12.5 ...
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67 views

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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63 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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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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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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74 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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94 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 ...