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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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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4answers
42 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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23 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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33 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
63 views

Using one channel from adc (pin connections) [on hold]

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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33 views

MSP430 ADC12 samples different value every time

I am doing an interface of MSP430FR5969 with an image sensor. So, I have this ADC settings. The adc input is connected to the analog out of the sensor ...
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2answers
42 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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36 views

How to compare two inputs? [on hold]

Hi i am new to PIC microcontroller. Actually i am making a project in which i have to compare two current sensor inputs in PIC 16f877a. The controller will then decide which source to select. Please ...
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1answer
20 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
38 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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2answers
44 views

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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130 views

How to sense current with transistor based design?

I am planning to build a differential amplifier for current sense purpose of microcontroller's ADC. Single ended CM amplifier should provide 3.3 V output to the ADC pin. 3.3 V, 5.2 V, and 3.7 V are ...
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22 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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1answer
69 views

Arduino-like with fast ADC/DAC [closed]

I am building a tester to measure the pulse response of certain equipment. The requirement is to apply a pulse in the low us range, measure the response, apply the next pulse etc. I have a setup using ...
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2answers
55 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
98 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
54 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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31 views

AD8615 short circuit [closed]

I have an OPA AD8615 http://www.analog.com/static/imported-files/data_sheets/AD8615_8616_8618.pdf that i use for a analog signal feedback at 3V3 level. This circuit (AD8615) is powred by a 3V3 PS ...
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2answers
68 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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35 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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1answer
40 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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32 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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3answers
71 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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3answers
137 views

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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2answers
80 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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32 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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2answers
110 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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3answers
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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62 views

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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57 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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3answers
81 views

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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2answers
63 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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61 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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2answers
67 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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24 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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1answer
71 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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1answer
90 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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84 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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2answers
67 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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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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72 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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2answers
208 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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65 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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61 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
149 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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87 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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3answers
113 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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65 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
863 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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72 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 ...