Ic for sinewave generation

[kumailbutt]

Please let me know the ICs which can be used to produce sinewave of 2.6 MHz?

 

[Reloadron]

You may want to consider using one of these.

Ron

 

[OlPhart]

Thanks Ron, Very nice chip, a big upgrade from the XR2206 (now obsolete). But, neither Digi-Key nor Mouser have them. Is there a newer version out? The datasheet is dated 8/07.

For whatever reason, that type of chip (sine generator) is tough to search for. I had a bad time looking for one recently, and missed that one. Ended up using some leftover 2206s. TNX again <<<)))

RATS! just checked Maxim: "no longer available", they outsourced it from a foundry & process that's been discontinued. The search continues...

 

[audioguru]

The MAX038 has not been made for a few years ever since a storm destroyed the factory it was made in.
Today, Newark has some XR2206 ICs in stock. Its max frequency is 100kHz for a good sine-wave or 1MHz for a distorted sine-wave.
Fairchild has an IC that makes an odd type of sine-wave but I can't remember its part number.

 

[Mr RB]

If it's a fixed frequency you could use a xtal oscillator and run it through some type of tuned filter to get a good enough sine wave, depending of course on what it actually has to DO.

People always have these "mystery" tasks...

 

[Reloadron]

The MAX038 has not been made for a few years ever since a storm destroyed the factory it was made in.
Today, Newark has some XR2206 ICs in stock. Its max frequency is 100kHz for a good sine-wave or 1MHz for a distorted sine-wave.
Fairchild has an IC that makes an odd type of sine-wave but I can't remember its part number.

That is the second time I got burned suggesting that chip and the second time AG was king enough to point out it is no longer made. You would think I would learn. Sheese!

The rough spot is obviously the 3 MHz Sine Wave. I don't know of a simple single chip solution.

Ron

 

[Boncuk]

Hi,

here is the circuit of a classic Wien-bridge sine oscillator. Regenerative feedback is gained by the 12V/60mA incandescent lamp.

Select an OpAmp you need for your requirements.

Boncuk

 

[Boncuk]

Another way is using a DDS function generator chip like the AD9834.

Selecting the AD9834CRUZ (master clock input 75MHz) it will certainly produce a clean sine wave of 3MHz.

Using the AD9834BRUZ (master clock input 50MHz) you'll have to prepare for some distortion.

Use an appropriate filter for the desired output frequency.

Boncuk

 

[OlPhart]

Thankfully, I only need .25 -> 3Hz then variable amplitude 0 -> 5V (or close) for ADC uC input.
TNX Boncuk, I'm not familiar with that chip (or "DDS" term), I'll guess it's a flavor of digital synthesis (discrete?). An approach I missed.
So, time for the geezer to "school hisself" yet again... <<<)))

 

[audioguru]

I remember an old sine-wave generator that used a light bulb for amplitude stability. The amplitude bounced and took some time to smooth the bounces until it was stable.

 

[Boncuk]

DDS means "Direct Digital Sythesis".