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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Problem with Operating ATmega16 in Differential ADC mode

I have used ATmega16 in differential mode by configuring ADMUX as 01001111 for (Reference Voltage at AVCC and external capacitor at ARef, Left Adjustment, ADC3 as Positive Pin, ADC2 as Negative Pin, ...
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21 views

Implementation of PSK modulation/demodulation

I want to implement a BPSK modulation/demodulation using a microcontroller (Arduino Due). The carrier signal should be at 1-50 MHz and the information rate at 300 KHz. For the sender part I would ...
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1answer
49 views

How to read signal from load cell?

I took apart a weighing scale to get the load cell from it. The weight scale was capable of measuring up to 85 pounds with 5 grams precision. The voltage drop of the weight scale, however, is too ...
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27 views

Does anyone know US based seller of HX 711 (24 bit ADC)? [on hold]

I need the HX 711 (24 bit ADC) board for building a weight scale. I am using a load cell (85 pound maximum, 5 grams divisions). All the seller of the HX 711 are based abroad mostly China. Shipping the ...
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1answer
55 views

Parsing Raw ADC Data into Voltage Levels

I'm collecting single-tone test data on the ADC12J4000EVM using the TSW14J56EVM and the High Speed Data Converter (HSDC) Pro software and ADC12J4000EVM GUI. I am trying to capture raw time domain data ...
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2answers
44 views

Flash ADC with TL074 & 74LS148: encoder inputs always high?

I am attempting to build a 3-bit 0-5V flash ADC using two TL074 quad op amps and a 74LS148 active-low priority encoder. The circuit is fairly simple. 8 100K resistors are connected in series between ...
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2answers
71 views

Arduino-based oscilloscope: attenuate the input by varying reference voltage?

I don't have a proper oscilloscope. I don't have the budget to buy one, even a used one. I have to roll my own. :( The plan is to use an Arduino Leonardo or Due as a combined A/D and USB interface ...
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74 views

1 PPS Accuring Clock Signal for ADCs

I am busy with synchronize all my ADCs on data acquisiton systems. My ADCs need to clock signals for their duty. So in my opinion for synchronization, if i send to all my ADCs clock signal which is ...
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1answer
79 views

Precise measuring of frequency with high-speed ADC

Let's say I have precise "reference" clock and I want to measure frequency of some other "target" clock, as precisely (let's say ~12-15 digits) and as fast as possible. In the simplest case one ...
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4answers
77 views

Best way to measure 0-5V with uController running on 3.3V

What is best way to accurately measure 0-5V with uController running on 3.3V? It will work in environment with quite a big delta temp (from -20 °C to 80 °C). I use stm32F4 12 bit ADC. precise ...
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1answer
49 views

Calculating latency for ADC chips

I am building a realtime based audio processing system that needs to sample 48KHz, 16bit audio, preferably with <0.5ms (the lower, the better) latency (Measured from analog signal -> data sampled ...
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2answers
58 views

is there any analog voltage reading ic present? [closed]

In arduino analogRead() reads voltage from 0 to 5 v and gives 10 bit output. Is there any IC which is specialized for this function only?
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44 views

Inherent sample and hold in a comparator?

I have been reading up why a flash ADC does not (theoretically) need a sample and hold circuit. I have learned that this is because the comparators have an inherent sample and hold property, but I can ...
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2answers
85 views

ADC sampling problem using FPGA

I am trying to sample sinusoid signals using AD7928, which is a 1 MSPS ADC. It is connected to an Altera Cyclone V FPGA, and runs at 20 MHz master clock. Data rate is 1.25 MHz and that's due to the ...
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2answers
190 views

Straight from the datasheet: Is this really a sensible filter circuit?

Cirrus Logic CS42426-CQZ is an audio CODEC that I want to use in a custom USB sound card. You can download the datasheet from there. On page 61, the datasheet has a recommended circuit for each A/D ...
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1answer
74 views

Replace an Analog Pot with a digital one?

I have a Boost converter with a constant current mode that allows me power a high power led (Vf 34, 3A). I'd like to be able to control the current potentiometer on this device with an arduino. To do ...
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1answer
39 views

How to read a wider range of voltages into the SA ADC on a PSoC4?

I want to read in a larger range of voltages into the SA ADC on the PSoC4, however as stated on the data sheet for the ADC component the different modes can only allow a range of 0 to 2 - 3 V and I ...
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0answers
36 views

AVR ADC invalid conversion result

My circuit works very strange. Can you help me please? Parameters: ATMEGA32A-PU JTAG ICE3 3.3 VCC 8MHz internal osc as clock AVCC connected to VCC AREF connected to GND through 100n capacitor ...
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1answer
67 views

Precision voltage reference for load cell and ADC

I want to know what could I use to have a stable 5V excitation voltage for my load cell(wheatstone bridge) which I could also use to have a stable 5V reference voltage for my arduino adc. Would a ...
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1answer
72 views

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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1answer
64 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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3answers
186 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
70 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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1answer
59 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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46 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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3answers
45 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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31 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
393 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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1answer
76 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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27 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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1answer
62 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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1answer
79 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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78 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
143 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
56 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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4answers
100 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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103 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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36 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
72 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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2answers
93 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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1answer
37 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
55 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
61 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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2answers
231 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
61 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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2answers
84 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
128 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
101 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 ...
2
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2answers
89 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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45 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 ...