An ADC is an Analog to Digital Converter. This device converts analog signals into digital form. It is mainly used by the digital circuitry to take analog measurements.
0
votes
0answers
13 views
ADC with STM32F3
I need to convert 4 analogue values simultaneously because I plan to compute the ellipse parameters (that's why I need the simultaneous conversion). I'm using the STM32F3 because it has 4 ADCs. ...
1
vote
2answers
90 views
Can I use one resistor divider to provide virtual ground to both halves of LM358 OpAmp?
I am trying to use an LM358 opamp to amplify an electret mic to something that I can read with my attiny85's ADC. (What can I say? I like DIP-8's :)
I feel that I need a gain of about 100 to get a ...
2
votes
2answers
78 views
How can I stablize an analog to digital reading?
I've built a clock out of a PIC16F877, some LEDs and other stuff...
To set the time in 5 minute intervals, I'm using a 22K ohm potentiometer connected between GND and +5V with the contact connected ...
4
votes
2answers
184 views
How to measure -50V to +50V using a microcontroller ADC?
How to measure -50V to +50V using a microcontroller ADC?
I would like to scale my signal so that -50V signal voltage equals -5V at the input to the ADC and +50V signal voltage equals +5V at the input ...
0
votes
0answers
29 views
Effects of Non-Linear Phase Shift/Delay in ADC
I am designing a monochrome image broadcast system that involves:
Camera -> DAC -> Frequency Shift Keying (FSK Modulation)-> Broadcast over FM ----- Receiving & Demodulation -> ADC -> PC Image ...
1
vote
1answer
63 views
Designing ADC driver circuit
I am designing the front end(single ended to differential) for the ADC using LTC6406 to interface with the 20MSPS ADC. My input frequency is 140 MHz.
Simulation Sch is shown below:
L1, L2 and C1 are ...
0
votes
2answers
61 views
differential input signal on unipolar supply ADC
As you all know, ECG is composed of PQRST wave. In that, Q and S segments are negative.
With reference to that, could anyone please explain how differential signals can be fed to an ADC which is ...
2
votes
1answer
35 views
ADS192R respiration rate detection
In SBAA181 - Respiration Rate Measurement Based on Impedance Pneumography (page 8/11), what is the purpose of having potential divider of 10ME (R1=R2)?
the reference of these resistors are ...
3
votes
4answers
122 views
Amplifier analog design - how to effectively do it when gain varies so much?
For example, I was thinking about building a small current sensing device that has an display to measure small current draws on some of my circuits. The design would be such that a very small ...
14
votes
2answers
873 views
What is the meaning of “half bit” in this context?
In RS-232 specification, the stop bits can be 1, 1.5 or 2 stop bits...I wonder how it's possible to have half a bit?
Also some ADC math uses 0.5bit precision in the IC specifications/datasheet. Can ...
1
vote
1answer
72 views
MSP430 ADC least significant bits always 1
I have an MSP430F2618 with built in 12-bit ADC, but for some reason the values it returns always end with the 2 least significant bits set to 1, except when it zeroes out. In other words, the counts ...
1
vote
1answer
41 views
Surge protection for ADC inputs measuring DC from batteries and switching supply?
I'm working on a circuit that senses AC presence and measures DC output from a switching power supply and a battery. They will stay inside a grounded metal case but out in the field, so the AC mains ...
3
votes
1answer
93 views
How do I measure ~16V battery voltage in an ultra low power system?
I am trying to estimate remaining battery life in a low power system. The battery is very well characterized so that reading the battery voltage will be sufficient for my needs to estimate remaining ...
3
votes
1answer
146 views
Kill off voltage below a certain level
Hi I'm looking for a component that does the following: if the voltage is below 1.5 V, then you need to make it 0 V. I'm looking for a high pass filter but with a certain voltage value. Does this ...
1
vote
1answer
38 views
XBee ADC without transmitting
I'm trying to store data from an analog sensor using an openLog board. I'd like for the openLog to transmit its data using an XBee, should another XBee come into range.
I'd love to be able to do ...
