lt1016 question

L

lalgac

Guest
Hi all,

I am now trying to convert a 10MHz sine wave to a 10MHz TTL signal
using a LT1016 comparator. The sine wave has peak to peak voltage of 1
volt. Does any one have any idea how to design such a circuit? Any
advice will be appreciated!

Lalgac
 
Assuming you are using a single 5V supply, bias both inputs at 2.5V with two
identical resistive dividers. Bypass one input to ground with a cap. Couple
the 10 MHz signal to the other input through a cap. If you need to adjust
duty cycle, make part of one of the four resistors adjustable. You could
also take a look at www.analog.com .

Tam
"lalgac" <lalgac@hotmail.com> wrote in message
news:23ecd2a9.0403241558.54018f2c@posting.google.com...
Hi all,

I am now trying to convert a 10MHz sine wave to a 10MHz TTL signal
using a LT1016 comparator. The sine wave has peak to peak voltage of 1
volt. Does any one have any idea how to design such a circuit? Any
advice will be appreciated!

Lalgac
Click to expand...
 
lalgac wrote:
Hi all,

I am now trying to convert a 10MHz sine wave to a 10MHz TTL signal
using a LT1016 comparator. The sine wave has peak to peak voltage of 1
volt. Does any one have any idea how to design such a circuit? Any
advice will be appreciated!

Lalgac
Click to expand...
Average the sine wave with an RC low pass filter and apply that
average voltage to one comparator input, and connect the sine wave to
the other input.

--
John Popelish
 
lalgac wrote:
Hi all,

I am now trying to convert a 10MHz sine wave to a 10MHz TTL signal
using a LT1016 comparator. The sine wave has peak to peak voltage of 1
volt. Does any one have any idea how to design such a circuit? Any
advice will be appreciated!

Lalgac
Click to expand...
Connect signal directly go guitar amp with volume set at '11'.

--
Luhan Monat: Luhan Knows at Yahoo dot Com
http://members.cox.net/berniekm
"The Future is not what it used to be."
 
"John Popelish" <jpopelish@rica.net> wrote in message
news:4062367E.AEAEF612@rica.net...
lalgac wrote:

Hi all,

I am now trying to convert a 10MHz sine wave to a 10MHz TTL signal
using a LT1016 comparator. The sine wave has peak to peak voltage of 1
volt. Does any one have any idea how to design such a circuit? Any
advice will be appreciated!

Lalgac

Average the sine wave with an RC low pass filter and apply that
average voltage to one comparator input, and connect the sine wave to
the other input.
Click to expand...
That probably will not meet the common mode requirement.

Tam
--
John Popelish
Click to expand...
 
In article <c3tf6m$7ek$0@216.39.172.65>,
Walter Harley <walterh@cafewalterNOSPAM.com> wrote:
"Luhan Monat" <fakemeout@nowhere.xyz> wrote in message
news:l%q8c.1585$Q45.509@fed1read02...
lalgac wrote:
Hi all,

I am now trying to convert a 10MHz sine wave to a 10MHz TTL signal[...]

Connect signal directly go guitar amp with volume set at '11'.


Your guitar amp has a lot better treble response than mine, evidently.
Click to expand...
Spinal Tap has them made special for them.

NOTE: If someone offers you the job as drummer for the Spinal Tap run
away very fast.

For quite a while, at work, we were saying "goes up to 11" around
president, quite unaware that he knew what we meant.


--
--
kensmith@rahul.net forging knowledge
 
Subject: lt1016 question
From: lalgac@hotmail.com (lalgac)
Date: 3/24/2004 5:58 PM Central Standard Time
Message-id: <23ecd2a9.0403241558.54018f2c@posting.google.com

Hi all,

I am now trying to convert a 10MHz sine wave to a 10MHz TTL signal
using a LT1016 comparator. The sine wave has peak to peak voltage of 1
volt. Does any one have any idea how to design such a circuit? Any
advice will be appreciated!

Lalgac
Click to expand...
The data sheet for the LT1016 shows that it allows operation on +5V (pin 1)
and-5V (pin 4) supplies, and has a TTL-compatible output with the GND (pin 6)
connected to GND. If you do this, you should just be able to do a
straightforward comparator circuit.

http://www.linear.com/prod/datasheet.html?datasheet=157

Good luck
Chris
 
In
sci.electronics.design,sci.electronics.components,sci.electronics.basics,sci.electronics.misc,
"Walter Harley" <walterh@cafewalterNOSPAM.com> wrote:

"Ken Smith" <kensmith@violet.rahul.net> wrote in message
news:c3usnp$58a$7@blue.rahul.net...
In article <c3tf6m$7ek$0@216.39.172.65>,
Walter Harley <walterh@cafewalterNOSPAM.com> wrote:
"Luhan Monat" <fakemeout@nowhere.xyz> wrote in message
news:l%q8c.1585$Q45.509@fed1read02...
lalgac wrote:
Hi all,

I am now trying to convert a 10MHz sine wave to a 10MHz TTL
signal[...]

Connect signal directly go guitar amp with volume set at '11'.


Your guitar amp has a lot better treble response than mine, evidently.

Spinal Tap has them made special for them.


Actually, a company named Soldano sells guitar amps where all the controls
go to 11, presumably in honor of Spinal Tap. But even Soldano amps don't
have enough gain at 10MHz to clip a sine wave, which is the OP's problem.
Thus my comment about treble.
Click to expand...
I recall a Marantz stereo receiver ad in Scientific American,
around the early '70's - what was memorable was that it claimed a
frequency response of 20 Hz to 20,000 kHz. Perhaps the OP could find
that model on Ebay...
-----
http://mindspring.com/~benbradley
 
There is a MUCH simpler (and likely cheaper) solution. Use an unbuffered
inverter (such as 74HCU04, or 74LVU04, etc.) as a saturating amplifier.
Bias it by taking a 100 kOhms resistor from output to input. Couple the
input signal to the input of the inverter by using a 1.0 kOhms resistor in
series with a coupling cap (1 nF or so). Output is nice and square. But
this may not have a -174 dBm/Hz noise floor, if that's what you are
looking for... But it is extremely satisfactory for most applications.

Mario C.


lalgac wrote:

Hi all,

I am now trying to convert a 10MHz sine wave to a 10MHz TTL signal
using a LT1016 comparator. The sine wave has peak to peak voltage of 1
volt. Does any one have any idea how to design such a circuit? Any
advice will be appreciated!

Lalgac
Click to expand...
 
lalgac wrote:
Hi all,

I am now trying to convert a 10MHz sine wave to a 10MHz TTL signal
using a LT1016 comparator. The sine wave has peak to peak voltage of 1
volt. Does any one have any idea how to design such a circuit? Any
advice will be appreciated!

Lalgac
Click to expand...
Take a look at the DDS/PLL design at http://www.qsl.net/ke5fx/synth.html
We used the LT1016 comparator to square up the 10.7 MHz DDS signal
The reference and signal inputs used the same DC source at 2.5 V with an
isolating resistor between them. This seemed to work well as a reference
for the PLL chip


Richard
 
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