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68 Threads found on edaboard.com: Adc Ref
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?
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 (...)
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 (...)
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
Hello guys.... I wanted to interface my Lm35 with pic18f4550... here is my code:: #include <18f4550.h> #device adc=10 #fuses XT, HS, NOWDT, NOPROTECT, BROWNOUT, NOLVP, PUT #use delay(clock=48000000) //#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7,ERRORS) #include void main() { float32 T , val; delay_ms(500)
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
i had written the adc coding...but i couldn't get the output for ldr sensor.....i couldn't find the flaws in coding....can anyone help?
I have a school project and I can't make it work correctly. I used diagram and code from this page . I added reset button, relay and ISP for programming. Now, the program shows values from 011 to 014 at room temperature (about 24 degrees in Celsius). Can anyone help me with w
hey I am using max1415 adc in differential input mode. maximum Differential Input i am having is 4 volt p-p sine wave (ie 3- (-1)). datasheet of max1415 tells me that max vref i can get (which is ref+ - ref-) is 1.75V. Now my que 1. since I can have -1V input at one pin does that mean i need to have atleast -1V at (...)
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 (...)
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.
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
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 (...)
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.
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.
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 (...)
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?
unsigned int adcRead(unsigned char channel) { unsigned int result; unsigned char sample_time = 5U; adcON1 = 0x80U; /* 10 bit Right justified result, Vdd as ref */ adcON0 = 0x81U; /* Conversion clock Fosc/32 */ adcON0 |= (unsigned char)(channel << 2U); /* Select channel */ (...)
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


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