Questions tagged [voltage-reference]

Anything related to the design and implementation of voltage references, i.e. circuits behaving like fixed (constant-value) voltage sources whose output voltage can be deemed very precise, accurate and stable. Voltage references are not meant to provide significant current to external circuits.

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6
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3answers
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Why do we need many complex voltage references when a zener can do the job

There is a huge variety of Zeners that exist. They have varying breakdown pd among other things. Why then do we need voltage references that are more complex and made up of many components?
2
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2answers
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Voltage Reference Output Impedance

Relevant Datasheets: AS431 Voltage Reference INA126 Instrumentation Amplifier I am designing a circuit which will amplify a few millivolt input (~+/-10mV full range) to a few volts (~0-8V output, ...
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3answers
210 views

Reference voltage source using classic rectifier diodes

I want to make some simple voltage stabilizer using operational amp, but need source of reference voltage. I know that I can buy this component, but shop is far away from me and paying 8e for courier ...
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1answer
416 views

-300 mV Voltage reference

I need a -300mV Voltage Reference for a Potentiostat circuit (http://www.sgxsensortech.com/site/wp-content/uploads/2012/10/AN2-Design-of-Electronics-for-Electrochemical-Cells1.pdf @ page 3). What is ...
1
vote
1answer
246 views

How to use “Arbitrary” Vref in FPGA?

Assume we have a simple Verilog module with 1 input (in1) and one output (out). Please look at the truth table at the end of this question. I want to send a signal with the voltage between 0-VCC0=3....
13
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1answer
3k views

Can I use differential I/O pins of FPGA as high speed comparator?

High speed comparators are rather expensive and speed is what FPGAs are very good at. On the other hand, FPGAs (in my case: XC3S400) have paired differential pins in each bank that their voltages are ...
3
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1answer
1k views

VREF of FPGA should be grounded if not needed?

I just started FPGAs. I know that Vref is designed for I/O Banks specially needed for some I/O standards or weak keeping. If I dont need them should I ground these pins or leave them floating( not ...
2
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2answers
1k views

Which is the correct voltage reference for a single supply instrumentation amplifier?

I'm working on using the TI INA333 in a single 3v supply configuration. I need to create a "mid supply" (half V+) for the REF pin. I have thought of 3 ways to do this: Voltage divider with ...
3
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1answer
1k views

For which frequency is ESR specified by default?

I'm playing around with an REF5010 voltage reference, and its data sheet specifies an output capacitor with an ESR of 1 to 1.5Ω for best performance. Now when I measure the ESR of electrolytic ...
2
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1answer
416 views

Precision Voltage Reference 0.675V +- 0.005

Is it possible and reasonable to make a voltage reference that outputs 0.675V +- 0.005 over an input of 6 to 40 volts?
7
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2answers
21k views

How to calculate minimum zener current if it is not explicitly specified in the datasheet?

simulate this circuit – Schematic created using CircuitLab I'm going to use 1N4740A as a voltage reference in a similar way you see in the schematics above. In textbooks, a zener property ...
3
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2answers
2k views

ratiometric ADC, is it feasible to separate reference voltage and excitation voltage by an amplifier

I have a variety of bridge transducers (pressure, strain gage) with sensitivity of 1mV/V. Also, most 24-bit ADCs and analog frontend chips have a PGA with programmable gain between 1-128. This means ...
5
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1answer
3k views

ATTiny Default AREF

I am trying to get the Adafruit Electret Microphone Amplifier to work with an ATTiny85 but am having some trouble with the reference voltage. I am using a 5V circuit because I am also powering a strip ...
9
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1answer
6k views

Using a Zener diode as voltage reference

I want to use a zener diode as a voltage reference to the the PIC18F2550, as the analog V+ reference. I am planning to use this zener diode, but I am not sure how to calculate its values. I am ...
19
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1answer
6k views

AVR 1.1V Internal ADC Reference Over-Voltage

If I use the internal 1.1V reference for the ADC, and my Analog input exceeds 1.1V, lets say 2.5V, is that harmful to my microcontroller? Or will ADC value simply clip (to 0x3FF) at 1.1V? For ...
10
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2answers
10k views

ATMega328 External AREF Connection

From the ATMega328 datasheet, section 24.9.1: The internal voltage reference options may not be used if an external reference voltage is being applied to the AREF pin. From the Arduino reference ...
3
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2answers
6k views

What is the function of this circuit?

Just wondering if someone can give me an explanation for this capacitor layout - what is it's function? The chip to the right is an ADC. Circled in blue. I'm guessing it is well known but i don't ...
3
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3answers
1k views

how voltage references work - LM336

In the datasheet for the LM336-5.0 5V reference it uses a 5k resistor fed by 10V. Am I correct in saying that I can give it 12V and it wouldn't matter as long as the current is limited to less than ...
4
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2answers
310 views

Learning about voltage references

I want to study the bandgap voltage reference and use it in somewhere. But first I would like to learn more about the basics of generating and using voltage references (mostly for operational ...
2
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2answers
537 views

What half-bandgap voltage reference is?

I came across term "half bandgap voltage reference". I expect it is somehow related to bandgap circuit. Do you know what it is, know its schematic or principle of operation?
1
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1answer
856 views

Precision Voltage Reference

I have a couple of questions regarding using a precision voltage reference on a DAC - AD7545A. I am trying to fix an existing circuit that uses AD584 to provide a 5V DAC (AD745A) to provide an ...

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