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68 Threads found on 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 (...)
Hello to all, i think this is my first post to the community. I am sort of new member and I like this site a lot. I am a student and electronics hobbist. Now to the point.... I need a low power, power supply with 12V output with low ripple. The input is a lead acid battery 8-14Volts( with cut-off voltage at 10 volts ). The 12Volts go to in
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 100C so more easy Temp=Readadc* 100/250; or Temp= (...)
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
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
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
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-
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 (...)
I thought opamp is fine as I used it to get higher SNR before. Anyway here is the situation: Opamp has ~50dB gain, output with 1.2Vpp differential swing, 1-bit quantizer. Vref is 1.1V. It is feedforward, 4-order and with two local feedback for distributed zeros. OSR of 28 and target ~65db SNR for the adc. Still need to rescale after getting coeffic
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