0 - 10VDC input/0 - 2kHz Output circuit/chip wanted

[PT]

Hi to all,

Anyone have any ideas where I could get my hands on something like the
above?

Thanks in advance.

 

[Thomas C. Sefranek]

Hi to all,

Anyone have any ideas where I could get my hands on something like the
above?

Think about what your asking...

0 Hertz?
0 DC?

How about a reasonable range of voltage and frequency?

What granularity? 2,000 Hz/10 V is a LOT of possibilities of adjustment.

Sine wave? TTL? what?

Thanks in advance.

--
*
| __O Thomas C. Sefranek [email protected]
|_-\<,_ Amateur Radio Operator: WA1RHP
(*)/ (*) Bicycle mobile on 145.41, 448.625 MHz

http://hamradio.cmcorp.com/inventory/Inventory.html
http://www.harvardrepeater.org

 

[Tweetldee]

Hi to all,

Anyone have any ideas where I could get my hands on something like the
above?

Thanks in advance.

Do a Google search for "voltage to frequency converter". There should be
several references that will answer your question. The LM331 from National
and the AD537 from Analog Devices are notable in that area.
I don't think that you'll get true 0 Hz out for 0V in, but it can get close.

--
Tweetldee
Tweetldee at att dot net (Just subsitute the appropriate characters in the
address)

Never take a laxative and a sleeping pill at the same time!!

 

[Ben Bradley]

Do a Google search for "voltage to frequency converter". There should be
several references that will answer your question. The LM331 from National
and the AD537 from Analog Devices are notable in that area.

This would also be called a voltage controlled oscillater. If
off-the-shelf solutions don't seem accurate enough for your needs,
check out Bob Pease's columns in Electronic Design (on the web
somewhere - use Google), in one column he had a 'very accurate' VCO
schematic.

I don't think that you'll get true 0 Hz out for 0V in, but it can get close.

You CAN do that reliably, if you add an offset to the input so that
it doesn't start oscillating until you apply 10mV or 100mV or so...

 

[GPG]

http://www.national.com/pf/LM/LM331.html#Datasheet
You can get 0V = 0Hz with offset adjustment. Output is a pulse, if you
want square wave go to 4KHz and divide.

 

[PT]

Think about what your asking...

0 Hertz?
0 DC?

How about a reasonable range of voltage and frequency?

What granularity? 2,000 Hz/10 V is a LOT of possibilities of adjustment.

Sine wave? TTL? what?

--
*
| __O Thomas C. Sefranek [email protected]
|_-\<,_ Amateur Radio Operator: WA1RHP
(*)/ (*) Bicycle mobile on 145.41, 448.625 MHz

http://hamradio.cmcorp.com/inventory/Inventory.html
http://www.harvardrepeater.org

Yes you are right - it's actually not that critical, maybe as much as 100hz
at start-up would be ok. Output can be Schmitted so no worries about
waveform.

Most important aspect though is linearity.

Cheers, Paul.

 

[PT]

Do a Google search for "voltage to frequency converter". There should be
several references that will answer your question. The LM331 from National
and the AD537 from Analog Devices are notable in that area.
I don't think that you'll get true 0 Hz out for 0V in, but it can get close.

--
Tweetldee
Tweetldee at att dot net (Just subsitute the appropriate characters in the
address)

Never take a laxative and a sleeping pill at the same time!!

Thanks, I have read that the AD537 is better than the LM331. Any
experiences, anyone.

Cheers, Paul.

 

[Da Man]

This would also be called a voltage controlled oscillater. If
off-the-shelf solutions don't seem accurate enough for your needs,
check out Bob Pease's columns in Electronic Design (on the web
somewhere - use Google), in one column he had a 'very accurate' VCO
schematic.

Check out a LT1043

http://www.linear.com/prod/datasheet.html?datasheet=178

 

[Ban]

Tweetldee wrote:
||
|| Never take a laxative and a sleeping pill at the same time!!

No problem tweet, but this time don't forget to put your nappies.

 

[Paul]

Hi to all,

Anyone have any ideas where I could get my hands on something like the
above?

Thanks in advance.

Have a look at the AD 654JN (analog devices)

Be careful around 0v though , as the results can be unpredictable