www.classdaudio.tk

4.096v Ultralow Noise, High Accuracy Voltage Reference

Another sample from Analog devices was this nice reference, with 4.096v output. You really need to check datasheet for numbers, because they are really really good, just to name a few:
- Maximum temperature coefficient (TCVOUT): 2 ppm/°C
- Output noise (0.1 Hz to 10 Hz): Less than 1 μV p-p at VOUT of 2.048 V typical
- Initial output voltage error: ±0.02% (maximum)
just to name a few.

I wired it, on SOIC to DIP adapter board with 1uF output capacitor, nothing on input, just HP6205B set to about 10v.
Output was measured with HP34401A and logged to PC. Sample interval was 10s and I let the test run for little over 48h.
Nothing special, long wires, no shielding or anything, just left it on my workbench.

So one data point = 10s, there are about 18000 data points.
Took that data into excel and I get this:

Started loging just after I turned it on for the first time, graph shows output voltage vs samples.

Click to expand

Here is similar graph, but shows, how voltage drifted away from average value of above curve in ppm (parts per milion).Click to expand

One thing you can see just after 9000th sample is when I turned the LED (switching) lights above bench on. That made impact on output (not great lights).

Excel data of ARD4540

ADR4540BRZ visits:

Application Note on bridging audio amplifiers

A discussion on bridging audio amplifier circuits like LM3886. Includes a schematic to drive a matched pair of amplifiers in a bridged configuration, power supply considerations for LM3886 and TDA1514 power amplifier circuits-especially in bridged pairs.

Application Note on parallel-bridging LM3886 audio amplifiers

How to make it loud - real loud. (230 watts rms into 8 ohms without clipping from 4 ICs. How to match LM3886s for parallel operation, then bridge the matched parallel banks. If you are not familiar with bridging amplifiers (BTL configuration), read the Application Note on bridging listed left in article Application Note on bridging audio amplifiers.

My first car audio system My second car audio system My 3rd car audio system
Click HERE or to My Projects to see what I did for myself

Contact Me | ©2010-2017 | http://www.classdaudio.tk |

Index visits: