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'[PIC]:ICL8038/MAX038 and PICs'
2003\02\16@214751 by Jinx

face picon face
I'm re-working a couple of old circuits for new uses as diagnostic
tools. One is an audio frequency oscillator based on the ICL8038
and the other is a similar one based on the MAX038. What I want
to do is make the best combination of the two units. In short, I'd like
the frequency generator that Harrods would sell you.
.
The ICL8038 has a range of 0.001Hz to 300kHz and the MAX038
from 0.1Hz to >20MHz (spec says, blurb says 40MHz). I'm looking
for any ideas about features that haven't occured to me that people
have found useful. It's more than likely that there will be a handful of
PICs and/or SXs to cope with the real-time demands

http://ee.wustl.edu/~info/docs/icl8038data.pdf
http://ee.wustl.edu/~info/docs/icl8038info.pdf
http://www.maxim-ic.com.cn/Max038-157/MAX038.PDF

So far,

Time bases (eg 50Hz sine for testing mains applications)
ExtOsc drivers for micros
Tone bursting (digital FM)
One-shots
Pots / PIC / external  control of o/p voltages, wave and sweeping
External / internal / conditional triggers

Each oscillator will have an LCD (or part thereof) showing duty cycle,
frequency, mode, voltage etc, all measured by a PIC, and a display
for inter-connections (patchboard and/or switches) between the two

As for measuring the high-end frequency of the MAX038, I'm guessing
that this couldn't be done directly to several significant digits by the PIC
either by CCP or other methods and that the frequency would have to
be divided down externally. True ?

Anyway, any/all suggestions welcomed, TIA

=====================================================

Programming today is a race between software engineers striving to
build bigger and better idiot-proof programs, and the Universe trying
to produce bigger and better idiots. So far, the Universe is winning.

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2003\02\16@221800 by Richard Graziano

picon face
Tha MAX038 is a superior design, with superior performance.  Why would you
want to use both in a design?
Rich
{Original Message removed}

2003\02\16@223854 by Jinx

face picon face
> The MAX038 is a superior design, with superior performance.
> Why would you want to use both in a design?
>
> Rich

Because I already have one of each, and the MAX038 is a
little pricey (although of course you get what you pay for). I
could get another to use instead of the 8038, but I'm not sure
if there's any advantage in that

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2003\02\16@224955 by Dave Dilatush

picon face
Jinx wrote...

>...I'd like the frequency generator that Harrods would sell you.

No Harrod's up this way.  All we have is Wal-Mart.

>...I'm looking
>for any ideas about features that haven't occured to me that people
>have found useful.

How about a second square-wave output whose edges are coincident
with the zero-crossings of the sine/triangle output.  The one
built into these chips has its edges located at the sine wave's
max/min points, and I've sometimes found this awkward.

Maybe a high-voltage or high-power output, switchable between the
sine/triangle/square wave outputs of the chip.

'Bout all I can think of, right now.

Dave D.

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2003\02\16@233115 by Ray Gallant
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face
----- Original Message -----
From: "Jinx" <spam_OUTjoecolquittTakeThisOuTspamCLEAR.NET.NZ>
To: <.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU>
Sent: Sunday, February 16, 2003 10:45 PM
Subject: [PIC]:ICL8038/MAX038 and PICs


{Quote hidden}

PIC
{Quote hidden}

I have used the ICL8038 and found that good quality caps enhance the
circuit.  Ideas, well DC offset, a pulser (i.e 1000 pulses (50%DC at 200KHz)
then stop.  Any chance of adding a TTL digital pulse counter (short
durations) or a basic form of frequency counter, I know it's not part of the
"generator" but handy nevertheless. {slewrate}

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2003\02\17@001527 by Richard Graziano

picon face
If I recall, the bandwidth on the Intersil chip is much less that the Maxim
chip, whic I think is about 25MHz.  I guess it depends on the application,
much like other design issues.  I have used the Maxim chip with good
success.  The printed circuit layout is important.  Although I have
standardized on nothing less than 4 layers, I think you could even get by
with a one sided board if small packaging is not an issue.  Good luck.
Rich :)
{Original Message removed}

2003\02\17@035438 by Jinx

face picon face
> Good luck.
> Rich :)

Thanks for the heads up on the layout, cheers

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'[PIC]:ICL8038/MAX038 and PICs'
2003\03\02@174910 by Jinx
face picon face
I've put some scratchings together

http://home.clear.net.nz/pages/joecolquitt/dual_osc.html

(osc-osc and osc-PIC connections not fully determined yet)

and have questions

MAX038 -

The square wave is +/- 1V about 0V and I'm not sure the
level-shifter used for the sine and triangle will treat it kindly.
Any thoughts on how to turn it to 0-5V at 20+MHz ? Adding
a logic stage seems the obvious answer

ICL8038 -

Square also symmetrical about 0V, but at least it's available
as a separate o/p. I think a single diode should crop the -ve
portion

Alternate suggestion for Strobe circuitry welcome. The one
shown is based on Harris AN. Original has a +/-15V control
i/p for the FET and I've added an opto for 0-5V control. The
two signal diodes are an AND to allow the o/p to start on the
same slope

PIC -

Auto-ranging would be a good feature, but there's a huge range
to cover. From 0.005Hz to over 22MHz. It's quite likely that both
CCP and timers will be needed. Possibly use the timers to gauge
the frequency and then CCP to measure it, or whatever combination
of the two gives the best resolution. It won't always be fast but it
could be fairly accurate

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