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'[EE]: Frequency Generator'
2001\02\22@073823 by James Hillman

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I am using a PIC to make a frequency generator 0 to 50,000 Hz with 0.01%
resolution. I have searched the PICLIST archives and the most suitable IC I
have come across to do the frequency generation is the ML2036 from Fairchild
semiconductor. Can anyone suggest anything else ?

Maxim MAX038, Harris HSP45102, Motorola MC145162,Analog Devices AD9850 are
too expensive and designed for RF so aren't really suitable.
I have considered using a Direct Digital Synthesis (DDS) algorithm, but
there is too much else going on in the processor to do this.

Thanks in advance,

James

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2001\02\22@074514 by Martin Lintzgy

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Try the ICL8038 from Harris.
Plenty cheap !


Martin Lintzgy
Tekelek (Europe)Ltd
spam_OUTmartinTakeThisOuTspamlintzgy.freeserve.co.uk
01726 883 787

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2001\02\22@124907 by Dan Michaels

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James Hillman wrote:
>I am using a PIC to make a frequency generator 0 to 50,000 Hz with 0.01%
>resolution. I have searched the PICLIST archives and the most suitable IC I
>have come across to do the frequency generation is the ML2036 from Fairchild
>semiconductor. Can anyone suggest anything else ?
>
>Maxim MAX038, Harris HSP45102, Motorola MC145162,Analog Devices AD9850 are
>too expensive and designed for RF so aren't really suitable.
>I have considered using a Direct Digital Synthesis (DDS) algorithm, but
>there is too much else going on in the processor to do this.
>


.01% = 1 part in 10,000. It may be difficult to get such fine
frequency control unless you use DDS.

However, another cheapo analog device to look at is the XR2206,
readily available from jameco.com for ~3.00 USD. I have used it
and prefer it over the 8038 chip, due to less waveform distortion.
You can control it with PIC PWM fed to a BJT stage and get at
least 1,000 different frequencies - although the control curve
will be somewhat non-linear, smaller steps at low end, larger at
high end.

- dan michaels
http://www.oricomtech.com
==================

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2001\02\22@190505 by Tom Handley

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  James, it sounds like you've looked at the most popular chips. I've used
the ML2036 as part of a PIC-based DAQ system. If you don't mind a 1Hz
resolution, the ML2036 seems ideal. All you need is a crystal (literally, no
capacitors). It requires +/- 5V and has a 3-wire SPI-style interface. You
clock-in 16 Bits, LSB first, and set a Latch Enable line to set the
frequency from 1 to 50KHz (I tested it to 65,535KHz). By using a 8.388608MHz
crystal (Digi-Key PN: SE3415 / Epson CA-301 family), you get a direct
one-to-one program data to frequency setting with a 1Hz resolution. The chip
provides Osc/2 and Osc/8 outputs which may be of use if you want to clock a
PIC at 4.194304MHz.

  There is a voltage reference input. Tying this to +5V gives a maximum
output swing of +/- 2.5Vp-p. You can reduce this via an external reference.
Harmonic distortion is -45db max. The device comes in a 14-pin DIP or 16-pin
SOIC package. For more info:

     http://www.microlinear.com/

  - Tom

At 12:42 PM 2/22/01 -0000, James Hillman wrote:
{Quote hidden}

------------------------------------------------------------------------
Tom Handley
New Age Communications
Since '75 before "New Age" and no one around here is waiting for UFOs ;-)

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2001\02\23@124542 by Edson Brusque

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Hello Tom,

>    James, it sounds like you've looked at the most popular chips. I've
used
> the ML2036 as part of a PIC-based DAQ system. If you don't mind a 1Hz
> resolution, the ML2036 seems ideal. All you need is a crystal (literally,
no
<snip>
>       http://www.microlinear.com/

   I've searched at MicroLinear site but can't find the ML2036. Can you
tell me where do I find more informations?

   Thank you very much,

   Brusque

-----------------------------------
Edson Brusque
Research and Development
C.I.Tronics Lighting Designers Ltda
(47) 323-2685  /  (47) 9993-6453
Blumenau  -  SC  -  Brazil
http://www.citronics.com.br
-----------------------------------

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2001\02\26@051030 by James Hillman

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> I've searched at MicroLinear site but can't find the ML2036. Can you
>tell me where do I find more informations?
>Thank you very much,
>Brusque

http://www.fairchildsemi.com/pf/ML/ML2036.html

Thanks for the replies. I'm now looking at using an AD9832 with a 4MHz
crystal. It has 2^32 resolution, but I don't know how accurate or stable it
is (it only arrived this morning so testing not started yet).

James

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