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.
338 questions
8 votes
1 answer
574 views
Zener inside a diode bridge
This comes from an LT application note, but I found the topology in other circuits too. The rest of the schematic isn't really relevant, this is the section I'm interested in: It seems to me some ...
2 votes
1 answer
160 views
What is the maximum potential difference between two isolated circuits?
My question is regarding the theory behind the difference in potential between two isolated circuits - both floating relative to earth. This is particularly relevant in HV applications, to prevent ...
- 47
3 votes
1 answer
349 views
Why is Shunt Voltage Reference (LM4040DBZ-3) Not outputting a stable 3V supply
Below is my schematic I have for the LM4040DBZ-3. I wanted to use this voltage reference as a stable supply voltage for my ADC MCP3208, but I am not getting the expected 3.0V (I am getting about 2.984 ...
- 61
0 votes
1 answer
130 views
Determing power supply requirements for ADC/DAC
I have an ADC (AD7792) and DAC (AD5686) and I am trying to decide what the power requirements are. Both can be powered with 5V for the analog and reference voltages, and the digital supply needs to ...
- 141
0 votes
0 answers
77 views
ESP01S with HT7333 and KA75330
I am running an ESP-01S with a 3.7V 18650 battery. To do this, I am using a 3.3V voltage regulator. When the battery power decreases, the voltage also drops, and when it reaches around 3.42V, the ...
5 votes
1 answer
252 views
Ground bounce on a PCB Plane
Suppose in my PCB, due to ground bounce, the voltage on the reference plane of a PCB, for example, increases by, say 0.2 V. In the PCB stackup, the ground plane (or return plane) is typically a ...
- 1,821
0 votes
2 answers
94 views
What is the purpose of the substrate terminal on the LM4040?
The LM4040 is a shunt voltage reference; it behaves similarly to a Zener diode, and indeed has that as its schematic symbol. It's pretty ubiquitous and common, and comes in a couple different ...
- 121
2 votes
2 answers
145 views
Stable reference voltage generation
I have a capacitive divider and a bootstrapped switch in an IC, with the switch being triggered to close by on-chip digital logic for just 20ns. The reference voltage (VCM) is currently supplied by a ...
- 775
0 votes
1 answer
77 views
Why the return of the CONTROL IN signal of this amplifier is not directly connected to ground?
The CONTROL IN signal on a Pioneer A50 amplifier is used to daisy-chain multiple Pioneer devices together, allowing them to be controlled by a single remote control. In essence, the signal from the IR ...
- 51
2 votes
2 answers
155 views
Is it possible to have a mV level accuracy reference voltage on board?
I built a simple voltage divider using a 100Ω trimmer and a 10μF capacitor to generate an 800mV reference voltage for a comparator. However, when probing the voltage, I observed ±10mV noise. Is it ...
- 775
3 votes
2 answers
469 views
How to properly design a circuit for an analog sensor?
I have an analog sensor that requires constant supply voltage and outputs a fraction of the supply voltage. I need to design a module that will be able to output a digital signal representing the ...
- 43
4 votes
2 answers
1k views
Understanding the ADC full scale input compared to a the reference voltage level of ADC
I have read this post here: Negative Voltage Reference for Bipolar ADC It touches on some of the points, and I am confused about the maximum input range of the ADC compared to the reference inputs. I ...
- 511
2 votes
1 answer
227 views
troubleshooting an electrooculography (EOG) circuit
I have been trying to deign an electrooculography (EOG) circuit using TL072 chips. This is my first time working with amplifiers and as such it has been a lot of new material. I am basing my design ...
- 59
2 votes
3 answers
1k views
Can a TL431 be configured to output a negative reference voltage?
I need a negative 1.25 voltage reference to zero out an LM317's output to zero. I have been at a loss to find a 1.25 V.R.device, so I thought I could use the TL431 with a divider. Can a TL431 be ...
- 21
1 vote
1 answer
84 views
Powering an ADC and a MCU from 12 V to 24 V
the concept is about an evaluation board that allows measuring up to 4 parallel load-cells from an ADC and process the output in an MCU: Input voltage to the entire circuit: 12 V to 24 V with ...
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