Tagged Questions

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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battery charger using pic [on hold]

i designed a 6V battery charger powering from solar panel. I'm using pic16f73. The whole circuit is powering from either solar panel or 6V battery itself. Battery voltage and panel voltage are ...
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1answer
32 views

CT and ADC interfacing [on hold]

How to interface a CT (Current Transformer) with an A/D converter ? I have searched but could not find perfect solution, Are some possible solutions: CT + Burden Resistor + Rectifier + filter ...
2
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3answers
116 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
68 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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25 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
83 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 ...
0
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3answers
255 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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0answers
37 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 ...
2
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0answers
47 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
70 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
54 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 ...
1
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1answer
58 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 ...
2
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2answers
62 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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0answers
19 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 ...
0
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1answer
69 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 ...
0
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1answer
73 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 ...
0
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1answer
64 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 ...
0
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2answers
48 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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67 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 ...
2
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0answers
40 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 ...
0
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1answer
63 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 ...
2
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2answers
191 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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0answers
37 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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0answers
45 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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3answers
101 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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0answers
51 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 ...
3
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2answers
830 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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1answer
71 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
218 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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1answer
108 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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2answers
56 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 ...
0
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1answer
54 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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5answers
142 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 ...
0
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2answers
71 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 ...
0
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3answers
51 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 ...
2
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1answer
108 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 ...
0
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1answer
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 ...
0
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1answer
41 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 ...
0
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1answer
37 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 ...
2
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2answers
78 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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7answers
147 views

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 ...
0
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1answer
141 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 ...
0
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0answers
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 ...
0
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1answer
130 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: ...
3
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4answers
118 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 ...
2
votes
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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2answers
99 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 ...