Data sheet acquired from Harris Semiconductor CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. Data sheet acquired from Harris Semiconductor These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. .. CD MHz. CD MHz. VOS at Any Channel. MHz. DATASHEET. Description. CDBMS .. N/P. ACKAGE. (P. D) (μ. W). CD CL. Ω. VDD. Ω. A B C. 11 10 9. 1. 5. 2.
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I forgot to mention. Power for Airborne Systems: I worked on Bimpelrekkie ‘s as well as Spehro Pefhany’s answers. Since it appears that the can support the 1mA what you could do to avoid Ron influencing the measurement is using separate multiplexers, one to multiplex the current feed it to a sensor the other to sense the voltage. I did not think about voltage compliance with A0.
Then post your datasgeet for us to see if it is powered correctly and that the select voltage is high enough. As long as there is enough voltage headroom across cd40511 current source circuit so that it is able to xd4051 make that current flow then any extra series resistance doesn’t jc.
Since i need to make a differential measurement between the first two leads of the pt while avoiding rds on of HC, i attached A0 of the ADC directly to the first wire through a schottky diode. It is not possible to read or write more than one pin on the at the same time, because you can only select one pin at a time.
You need a pulldown cd451 for the output, here is the way it is hooked up in my E-Drum project Cd405 am working on One can look at the schematic and explanations here.
This circuit lacks protections and needs to be completed as many pins are yet open, but at the least the basic scheme must be verified. How to use a 8-bit multiplexer Posted by yjpang84 in forum: You May Also Like: Bimpelrekkie thanks for clarifying.
Dec 20, 5. I dont know if i should change the edit figure and text or keep it like this. Rds on is huge as much as ohmsand varies with supply voltage, input voltage and temperature. The current will always be 1 mA whatever value the resistor has. I am a novice mechanical eng. Telecommunication measuring equipment Cable and pipe tracing Cooper networks IT networks Optical networks Spectrum analysers more In general how much current variation can i expect? Do you already have an account?
cd451 Hello All, Firstly, thanks a ton for the help. You may be better off expending the scratch for genuine analog switches that have a degree of built in protection and adding some external protection around that.
So the current may not be that cd4015. Spehro Pefhany k 4 There is no such limit on switch current- 1uA is leakage. But, when I simply connect the input without the mux, I see normal behavior of the circuit, i.
I tried connecting 1k resistor at the output of mux, but I see that the signal is diminished i. I guess i will have to go with the better versions of for now. Its been 2 months now I am having problem. All the select lines of 8: You mean once the daatasheet if soldered fixed, the current from a particular circuit will be stable over time and temperatures?
Can you post the circuit?
CD4051 PDF Datasheet浏览和下载
No, create an account now. Dec 20, 2.
The customer is in the focus We want to make sure that customer is the center of attention. This i presume will help make a better differential measurement at the ADC A2 and A3 while avoiding any current passage through HC Its only when I connect the mux, I see the loading effect. Can i use transistors as switchs to route the 1ma instead of CD?
If you only want AC signals to come through the MUX, you will need to use a cap in series to block the DC level, and a resistor to ground. Can anyone please suggest me how to deal with this issue? Now my problems are: Sign up or log in Sign up using Google.
CD Datasheet(PDF) – TI store
Thanks a lot for responding so far. Add to cart On stock. Post as a guest Name. If you really want to measure ‘top’ lead resistance for some reason other than break protection for which A0 suffices you can add another analog multiplexer and pick off the voltage at the ‘top’ of the RTD.