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Hello,
Has anyone worked with Logarithmic digital pots.
I have worked with Ds1804-100 which is a 100Kohm non-volatile digital pot. Since this is a linear one, I have problem when controlling audio volume. So I am thinking of changing it to Logarithmic one and I found MAX5407 as an ideal one...
Thanks.
But I dont have much analog understanding to measure out jitter and all. At receiving end I can hardly recognize FSK plunged in some noise signals.
Yes, The idea is to send the audio as analog and the data together in a single cable. And data as FSK just above audible frequencies. I used 74HC4046A, eventhough it has some frequency drift over time.
With driving section it transmit the FSK with around 350mV rms. Output has an isolation...
My aim is to send both voice and fskdata in a single twisted pair cable. So I decided fsk above audible range, thereby center freq around 30KHz. It may travel more than a mile to reach another node.
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Thanks Brian for the better idea. I think that will eliminate any need of...
Thanks Jiripolivka and Brian.
I understand it as the ContinuousPhaseFSK.
I already tried TI's CD74HC4046. But the frequency is not found stable for TSSOP package.
I had a prototype with DIP package and that worked quite fine. Also in datasheet, 0.11%/degreeC drift is mentioned.
Anyone know any...
Hello,
Can I generate BinaryFSK with two different oscillators (one for mark frequency and other for space) switching with analog switch or multiplexer? How about the switching noise?
Thanks
My communication involves several nodes which communicates with FSK.
Suppose all nodes are set to 30/33kHz. If one node's set frequency drifts (around 1.5KHz change by ambient temperature, it happens in my case with TSSOP package..! With DIP package it is fine), then detection(with XR2211) is...
Hi Klaus,
For the FSK modulator I need two frequencies for low and high states (only two states).
74HC4046 output frequency depends on the VCOin voltage. For me I have already tested it and it generates 30KHz for 0V and 33KHz for 3.3V. And I can even communicate successfully by using XR2211...
Thanks Klaus.
But strange to the term regulation loop.
I am planning to add a resistor network such as the attached which I hope will do the needful.
Please comment.
Thanks
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