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36 Threads found on edaboard.com: Vref Dac
vref is the maximum output that dac shall give when the biggest binary input word (0xFF for 8 bits) is given. vref is the maximum voltage for which an ADC shall give the biggest binary output word (0xFF for 8 bits). I don't know what will happen if the input to the ADC is bigger than vref though. Why do many ADCs have (...)
First eliminate all static sources of error using a calibrated dac. THis includes ground shift of vref from digital currents and thermal drift of vref. When I designed a 12bit SCADA system in the 70's I used BB 12 bit ADC's and dac and was happy with dac but had issues with monotonicity missing codes and (...)
hi all i am working with dac 0808 i have implemented the circuit given in the datasheet (circuit schematics is attached)108209 i have changed the positive vref to +12v and vee to -12v and capacitor bypass to ground on positive vref ,rest circuit is same, the problem is after giving power to the system IC 0808 get heated ,
I use STM32 discovery value line board. Normally, the voltage that get from dac of this board will be 0-3V from the define value 0-4095. But right now, the voltage that I got it vary between 0-300mV only. As I know, this board is the old board and never modify vref. Could you please help, what should be cause of this problem?
Hi there, I have heard that an internal ADC used in the delta sigma (DS) ADC is a low resolution one, but the internal dac needs to be as accurate as the whole DS ADC. Assume we want to design a 10-bit delta sigma with a 3-bit internal flash ADC. we know that offset of flash ADC could be less than vref/2^3. But what about dac, its offset (...)
Hello, I am looking for a differential resistive dac in literature/papers, which - has single vref reference voltage - common-mode of output differential signal is CM -and CM > vref I didn't find any information/example/paper. Could you please show me such examples? Thanks.
Hello, SAR - ADC clock period = 1/20Mhz LSB size = vref / 4096 for a 12 bit ADC So if vref = 2.5V, then LSB is 600uV As a general rule the settling must be within (1/2)LSB in (1/2) clock period Is there any ADC reference buffer architecture that can fulfill such a tight requirement ?? Should I use a voltage regulator which has a fast load regulati
Unless you are following special intentions and fully understood the function of each dac0800 pin, you should refer to a standard schematic from the datasheet. vref+ and vref- are the reference inputs and can't work when connected to the supply rails.
Hello everyone!!! I m using dac in LPC2148 ARM7. Here Pin 9 has been connected to resister divider network. this divided potential is fed to op-amp. now when i write a value in dacR resister o/p on pin 9 is shown acc to the value written with respect to vref. but when i rewrite the value in dacR which is lower then previous (...)
Can any body suggest me dac specifications ,required for SAR 4-bit ADC.How to start the design ? what can be the values for Resister and op-amp specifications like gain etc and vref required ? please suggest some guidelines to design.... Thanks in advance..
I am designing an 8-bit capacitor dac (thermometer coded). I am confused about the clocking in the dac. I have gone through several datasheets and I didn't find the CLK pin on any dac chip!! They just have supply pins, input-pins, output, and vref. Then what about CLK signal? Are the clocks generated internally or how (...)
I need some help in understanding how a dac's programmable gain is used and how to change it. The circuit I am working with is using a AD5446 dac from Analog Devices. The Rfb is set up as the input and the output, Iout1, is fed through an op amp before being feedback into vref. I am pretty lost on where to begin or what to do. Overall, (...)
What ever vref you decide with direclty affect your opamp specs . vref is normaly given and from vref we decide LSB and opamp specs .
look at my answer in your previous thread, you seem to be using the unipolar configuration which has an output of -vref to 0. Alex
Hi I am using dac7800(12 bit),i connected vref to ground and operating voltage of dac is 5v.whether it is correct? If it is correct means what will be analog voltage,if all bits are set to 1.
hi all, I want to do adc in pic18f452. For verification i am applying a sine wave(amplitude=1v and frequency=2Hz) as an analog input to the pic and want to convert the digital output of pic again to analog sine wave using a dac0808 pic18f452 has a 10bit adc but i have adjusted the input voltage and vref in such a way that digital output is in 8 b
Hello, i am working on SAR ADC design in cadence schematic composer..i am getting proper ouput from shift register but after shift reg. to SAR register ,not getting proper output...can any one help me? for 5-bit dac , shift register output is 10000 but therotically,we get out of 2.5v for vref=5v..but practically, i get 0.3125mv.. a
Hi, I think you need only a +/-5V supply for the Op= its done! K. Added after 5 minutes: These becouse dac8831 has self an voltage output between 0V & vref! With the OpAmp as a buffer only you have it repeated/amplfied, bat if the OpAmp is connected into your circuit (with dacs onchip resistors); control
there are 256 resistors placed from vref to gnd and some switch behind of each res node,when one of switch is off and another switch is on the charge will be injected in the res string and the node voltage of res string will be changed ,through about 500ns the node voltage back to the initial value , this time is so long and the output voltage will
I am having some difficulty with this circuit. My input is an iPod who's signal centers around 0V and swings +/-1V. The ADC, in this example, is set to 12-bit processing. According to the transfer function and when vref+ - vref- = 3.3V, the theoretical ranges for conversion are: 0V - bottom 1.65V - midpoint 3.3V - max My op amp circuit