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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Load cell, help

I am using load cell, from here. Load cell specification are mentioned on the site. 5 wire coming out, its a 4 wire core shielded load cell. What screwing thing i am facing is: Getting same voltage ...
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37 views

Ways to offset analog signal back to zero

My signal is offset by about +6V and fluctuates around 5V and 6.5V: I am using three OpAmp stages to buffer it and bring the offset to zero and invert it. This requires negative rail voltage. I ...
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105 views

Interfacing an RCA audio output to a microcontroller ADC

I'd like to connect the audio output from a set-top box (and similar) to a microcontroller's ADC. They all have an RCA connector so I was wondering what sort of circuit may be required to interface ...
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1answer
46 views

What are these components in block diagram of STM32?

Today, when I was seeing in STM32F103RET6 datasheet I saw some odd things(also, they are odd for me, probably you have enough information about these). if look in 12P of datasheet, you will see this ...
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1answer
30 views

JESD204 ADC - fiber optic?

There's a Youtube video of a high speed ADC, using JESD204 high speed interface, interfacing with an FPGA via a fiber-optic transceiver: http://youtu.be/vkrms2udeKI Is there a commercial version of ...
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2answers
41 views

Asynchronous counter for DAC input

Is it OK to use an asynchronous counter for DAC input? If I understand it correctly, the output pins on the counter do not change simultaneously with the clock? Does the latency for every higher bit ...
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5answers
206 views

High Voltage differential Measurement

Suppose I want to measure individual cell voltage of a 12-serial-cell battery pack, what would be my most economical options? Single cell voltage is 3V-4.2V but the stack can be between 2-12 cells ...
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4answers
101 views

Voltage divider for battery monitor ADC - loading effect?

I'm building a voltage divider to use for feeding into an ADC to determine the battery voltage of a device I'm designing. Is it important to consider the input impedance in the ADC and to account for ...
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41 views

Does TI Tiva C ADC 5V tolerant?

Does TI Tiva C uC ADC input is 5V tolerant ? EDIT: Found ADC parameters in datasheet http://cl.ly/image/3D1Q3q09470J. Please don't down vote. Thanks
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42 views

Is the channel frequency of the ADC and the sampling rate related?

I don't know much how ADC works. I am using a code I found, which has some #defines: ...
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1answer
58 views

Can I connect an ADC directly to a DAC?

I'm planning to do some audio DSP soon but I would like to know if I can connect an ADC directly to a DAC without a processor in the chain. My main reason is to test preamp circuitry. I would like ...
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3answers
75 views

AVcc, and capacitor, using ADC

I am using Atmega328P to read temperature from LM35 and display it on the LCD (along with few several things it does). I want to understand the capacitor and connections for the AVR itself and AVcc. ...
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3answers
148 views

Why charging time is same and discharge time is different for two inputs in dual slope integrating ADC?

For different input voltages in dual slope ADC, charging time remains same but discharge is proportional to the magnitude of the input voltage. How it works in that way ? Charging time is independent ...
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1answer
66 views

Temperature measurement using LM35

I'm doing a project on beaglebone black and I'm interfacing a LM35 temperature sensor (datasheet) to one of the ADC pins of the beaglebone. As per the Beaglebone datasheets the reference voltage of ...
2
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1answer
18 views

CML signal to ground terminated line or peak sensing ADC for short pulse

I'm currently designing the prototype of a timing instrument. One sensor gives an analog CML (current-mode logic) signal, from an amplifier (ADN2880). One end of the pair is routed to a comparator ...
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1answer
38 views

Low Current Battery Montior Detail Question

I'm trying to design a circuit that will be running from a battery. I'm currently working on the part that detects the voltage and came across this question (and answers) here: It made pretty good ...
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2answers
103 views

Interference on ADC reading (STM32F4)

I'm using the ADC of a STM32F4DISCOVERY to sample a signal. The sampled values are directly written to the DAC. I tested this and it worked absolutely fine, just as I would expect. Now I wanted to ...
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1answer
34 views

ATmega dual pin function JTAG and analog input

I need measure temperature to adjust ticks as temperature changes. I suppose thermistor nearby crystal (10ppm) as low cost solution. I'm using AT90USBxxx but I have allocated PF0-3 for more important ...
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3answers
158 views

RC filter infront of Analog port pins in pic microcontroller

What is the use of RC filter in front of Analog port pin while using port pin for analog to digital conversion in pic 16f877A and in most pic controller the RC filter is advised to be used?
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1answer
44 views

Reading analog sensor as a microphone signal (via sound card)

I was thinking and studying on how an analog-digital-converter works and just realised that the sound card of every computer-devices is exactly that one. My question is: how can I read an analog ...
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1answer
65 views

DMM Auto-Polarity / Polarity detection

I have understood how auto-ranging is typically achieved on a digital multimeter, but I'm having trouble finding an example of how (DC) polarity is handled. How does the meter know if a voltage is ...
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2answers
95 views

uC to host Bluetooth module via UART

I am a newbie. I am trying to finish a school project, I need to transmit an analog signal to the computer via Bluetooth. I am using Bluegiga WT12 as the Bluetooth module, and I want to use it with ...
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3answers
130 views

How to uniquely identify which PCB is plugged in / connected

I am designing a board (Main PCB) into which any one of about 60 slightly different boards (Peripheral PCB) may be connected/plugged-in. The challenge I'm facing is to autonomously identify which of ...
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2answers
43 views

Voltage sensing

I have a system that needs voltage monitoring. +12 Volt DC -48 Volt DC (-54 Vdc) The ADC chips I can find are limited with input voltage of max 5V. Are there ADCs capable of doing the higher ...
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1answer
98 views

Hi tech c adc code not working as expected

I am new to using PIC micro-controllers, and I am working on a project that involves reading an analog value. I am using the PIC16F877A. I have found code for using the ADC posted below however when ...
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1answer
29 views

Input voltage for the ADC PCM1807

In the datasheet (http://www.ti.com/lit/gpn/pcm1807) of the Texas Instruments PCM1807 in section ABSOLUTE MAXIMUM RATINGS (page 2) it says Analog Input Voltage \$V_{IN}L,V_{IN}R,V_{REF}\$: \$-0.3V ...
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50 views

Impedance Matching Resistor

I'm working on a high speed ADC/DAC board. I saw some reference designs for the device, there are matching series resistors connected between output digital pins & controller. Though, resistor ...
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72 views

PIC18F4620 ADC Conversion

I'm in need of help in understanding how to code ADC conversions for the PIC18F4620. If someone could provide an example code with comments that would be great. Also if someone can explain to me how ...
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1answer
134 views

VU meter from line input or speaker input?

Is any of the the two following schematics for Line input? Or is it for the amplified signal that goes to the speakers? ( source ) ( source )
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1answer
34 views

Multiplex based autoscale, question on simple circuit

I was looking for a clever way to automatically scale voltages from, say, 0-50V with a mux to an ADC (0-5V) without worry of damaging my inputs. My thought a simple amplifier with selectable gains ...
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1answer
48 views

How to decide to cuttoff frequecies of filter in case of using ADC( Flow: Analog-signal to ADC to bits to fir_filter to filtered_output) [closed]

FIR filter has to be used for removing the noise. I don't know the frequencies of the noise that might be adding up into the analog feedback signal I am taking. The ADC has takes just a voltage value ...
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2answers
91 views

Multi-cell battery measurement design

The task is to measure the voltage of individual cells in a 48-cell battery pack of AA cells in series. The measurements serve to log performance statistics, warn the user if/when a cell dies, or that ...
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1answer
32 views

ADC pin current consumption

I am using a voltage divider to read abt 9V. This divider n/w is connected to an ADC (analogue pin). Now, I am concerned abt the wattage of the resistors in the divider n/w. I am using a KL04 ...
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2answers
63 views

Any ADC for 100ksps to 10Msps? [closed]

I have to sample 50 kHz signals having BW of ~30 kHz (35 kHz-65 kHz). For this purpose I'm looking for ADC's with Programmable Sampling rate ~100 ksps to 10 Msps Dual channel (14-bit) Can you ...
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1answer
44 views

ECL to Lemo connector

I am designing a DAQ software, which looses some information during read out. There fore I thought of testing another CAMAC ADC and in particular the Lecroy 3351. Surprisingly I saw that it doesn't ...
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1answer
198 views

Problem testing an ADC with a DAC and voltage divider

I am testing a self-made ADC shield for Arduino Due based on the ADS1299, a 24-bit ADC with a 24x programmable gain amplifier. I have a signal generator sketch running on another Arduino Due that can ...
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2answers
50 views

Can I use MCP3002 for undersampling?

I am planning to build a software defined radio. For this purpose, I need to sample analog signals using an analog to digital converter. In clasical Nyquist sampling, we need to sample with a rate ...
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57 views

Calculates the volts from CS5530 24-bit AD converter

I have this circuit (Power supply is 5V): The problem is: How to convert the values to Volts? I get the digital value in 24-bit from spi interface, but I don't know the minimum and maximun voltages ...
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1answer
70 views

Connecting a current follower to a Raspberry Pi with an MCP3008

One of the experiments I conduct in an instrumental methods class is the construction of a rudimentary spectrophotometer described in the Journal of Chemical Education (link here if you have access to ...
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2answers
101 views

Decoding ADC pin labels

I'm about to buy a parallel ADC to connect to an EPROM in a analog-digital circuit. I've found some potential ADCs but am having trouble deciding if the ADC and EPROM are compatible. A bistable ...
2
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4answers
166 views

Non-linear error in ADC readings

I am measuring voltages up to 20V with my ATmega2650 MCU (10-bit ADC). I'm using 5V precision voltage reference (LT1021 - 0.05%). Voltage dividers are setup with 1% Panasonic resistors. ...
2
votes
4answers
124 views

Do digital Anti Aliasing filters exist for traditional ADCs?

I'm currently learning about Analogue to Digital Converters. From what I understand, aliasing occurs if the input signal being sampled has power above the "Nyquist frequency" of the ADC(Sampling ...
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3answers
47 views

LTC2485 I2C Data Format

I am trying to understand the I2C data format of a 24 bits ACD (LTC2485). The data sheet says it returns 4 bytes (32 bits integer), but is unclear as to where the 24 bits I seek are located. Here is ...
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2answers
82 views

ADC & sensor calibration

I have a scenario that implies measuring 2 inputs: - voltage through a resistive divider - current through a hall sensor followed by opamp for offset, direction and scaling In my software, each ...
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3answers
101 views

Circuit to Detect Floating Signal Line

I have a few external input probes on a device I'm making which are connected to an ADC. Is there an electrical (i.e. non-mechanical) method of detecting whether the ADC input is ...
3
votes
1answer
142 views

USB transmissions crash my software GUI

I'm transmitting a buffer array from inbuilt USB of PIC 18F controllers and sending this to a GUI. I am able to detect the device properly (enumeration). But the GUI crashes some times, without any ...
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1answer
33 views

Xmega ADC ground as internal input

Someone knows if it's possible to set the internal ground as input in the ATXMega256A3BU? I need it to find the zero offset.
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2answers
261 views

Measuring average current with uC and current shunt

This is my first post. I'm a software guy trying to do hardware so be gentle :) Circuit I'm designing a small circuit (see pic, and sorry for messy schematic) that plain and simply is a bunch of ...
3
votes
1answer
156 views

ATMEL Xmega ADC Input impedance

I need to read a 0-6V buffered analog signal from a sensor with the ATXMega256A3BU ADC. With an external voltage reference I can measure voltage level up to about 3V. I'm going to realize a voltage ...
2
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1answer
60 views

Why DC spurs are present in FFT plot of ADC

While reading about coherent and non-coherent sampling of ADCs in general, I read that we need to neglect first 6 DC bins in the output FFT plot while calculating parameters like SNR, SFDR etc. for ...