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68 Threads found on edaboard.com: Adc Ref

## IC LTC2410 24 bit ADC

I am trying to use 24 bit adc LTC2410. I am applying the below voltages to LTC2410. Vcc: 3.3V ref+: +3.3V, ref-: Ground IN- is connected to Ground Should the maximum voltage on IN+ is 1.65? Why is it so? 2^24 = 16777216 bits. 3.3V = 16777216 bits 1 bit = 0.19nV. Is it right?

## Why AD8226 Ref does not work sometimes?

I used AD8226 to amplify a signal, and use AD1581 as its output ref. AD1581 should output 1.25V, and it works normally. My original purpose is to output a positive signal for adc. But AD8226 sometimes output negative signal, and its ref is -1.25V. The gain resistor is 51 ohms for AD8226 so that I can get almost the max gain, 1000. Who (...)

## problem in using arrey & ADC using 16f777

hi, I have written following program to convert ten analog inputs to digital signals, and put appropriate output regarding to comparison with ref signal (not determined yet). we use pin Vref- and Vref+ (AN2 & AN3) as voltage reference and AN12 pin as external interrupt. when I use two dimensional signal "if state", the (...)

## Input 8-15V output clean 12Volts low ripple for sensor excitation

You can run the IA125P off 3.7 or battery directly. The Power Supply Rejection Ratio or PSRR is 100dB in the audio range, so no additional regulator is needed. The IA also has a precision 2.5 V ref builtin. For RF noise on cable to load cell, you may need ferrite choke around cable. If using 12V, you can scale output down to adc input range with

## Pic18 Interfacing with LM35DZ

hello, What is the ref for adc , is it 5V as +Vref and -Vref=0 so, you get 205 points for 100 °C calculus becomes Temp= Readadc*100/205; if you can use +4.096V for +Vref you will get 250 points for 100°C so more easy Temp=Readadc* 100/250; or Temp= (...)

## Interfacing loadcell with PIC using

hello, you need to amplifie a very week signal or use an AD7715 16 bits differential adc or MCP3424 up to 18bits resolution example : 16384 points for a scla of 128mV or other ... to treat the signal without adding analog components

## regarding ldr sensor....

hi i am not familiar in pic. but generally, i will give some points, i hope you had correct initialization in adc code and no hard ware faults. first thing is, check the ref voltage of the micro-controller , second thing is, check the datatype of the ldr_val

## Problem with LM35, ADC0804 and 89s52 interface (assembler code)

Hello rvs, Your LM35 can measure -55C to +150C with accuracy +1.5C and output scale 10mV/C. Your adc has 8-bit resolution with a maximum of 256 (28) steps. So, for Vref/2=1.28 Volt, you will get a full scale value for Vin=2.56Volt=2560mV. Rem

## Differential refernce for adc

You need to reduce input voltage and shift by 1V to avoid negative values. Shift input voltage by adding a DC source of 1V, so new range will be 0 - 4V and then add a divider with factor 2, so new range will be 0 - 2V; with these range value can go to MAX1415; in software code need to take account these operation (shift and scaling). ref+ and ref-

## Using the atmel atmega 16 ADC

Hi 1) the reading on the adc is Vinput / Vreference * 1024. If Vreference changes, then you obtain different readings with the same Vinput, and this in most cases unacceptable. You then have various choices: - use a good quality AVCC - use a reference voltage source connected to Aref - use the internal (...)

## Sigma Delta Coeficients

hi i want to design sigma delta adc and start using delta sigma toolbox would you introduce me good document to start using this delsig toolbox ?If you would like to use Schreier's Toolbox, you need to read the following book at least.

## i need ac 0 to 400v above pic voltmeter

You need to rectify the AC input to get a DC value that is going to be approx. the peak value of the AC input. As this value is very high, place a voltage divider to suit the range of the adc inputs of the micro controller. Take care with the voltages that you are handling. The peak voltage will be more than 560v. Standard resistors do not withsta

have a look at Microchip's code examples for the PIC18 and adc

## micontroller ADC to voltage conversion

Hello, I have a temperature sensor connected to a 12-bit microcontroller, with the reference voltage being set to 2.5V (sref:refERENCE_Vrefplus_AVss, ref2_5v: refVOLT_LEVEL_2_5). When the sensor and microcontroller are fed through a battery board (3.7V battery with 3V regulator), then (...)

## Why use bandgap reference voltage 1.024V???

Hi diarmuid! So, why 1.024V, it's for 1LSB => good for standardization of adc. ;-) And normally, this is reference voltage, i think it should not be called bandgap ref voltage, because the typical bandgap voltage is between 1.2 - 1.3 V, it is based on the theoretical value for silicon is 1.22eV at 0K.

## Help in hardware connection

Hello..i am interfacing lm35 with pic18f452..and i have to give 2.5 ref adc of pic using lm336..i dnt knw how to connect the adj terminal of lm336...m uploading the images of the circuit..and lm images.

## adc confirguration for pic16f877a microcontroller

If you look at page 112 of the data sheet which can be downloaded from Microchip, You will see that to configure the A/D you write to register adcON1. for example adcON1 = 0x80; /* 10 bit Right justified result, all analog inputs, Vdd as +ref, Vss -ref */ Then on page 111 To configure the conversion clock, select (...)

## Reference voltage and full scale range in ADC

Hello, I was asking about the reference voltage and how to choose its value in the design of adc supposing I have VDD and what is its relation with the full scale input in dBm and Does it relate in any way with the bias voltage of the adc?

## adc problem using pic16f877a

HI can anyone help me? I am new using micro c pro. i am using pic16f877a, how to configure adc? please can anyone lend me a code for configuration? i have a current sensor which will convert current to a certain voltage. and this voltage is serves as an input to pic16f877a. i want to use PORT A only ,disregarding PORT E. because I only

## what's the effect of the input stage of amp?

Hi,there Recently I have seen a folded-cascode amp with a different input stage than usual in a folding adc,as can be seen in fig attached. The Va and Vb are two signals from previous flash-like pre-amp stage which generate some cross zeros and amplify the different between input and ref. .I wonder what the effect of the input stage,for the conn