digital electronics design

Guest
hi
I need to divide two 10 bit numbers.I would like to know if any kind of
chip is readily available or what would be the best circuit for
implementing this(A circuit for a higher number of bits like 16 will
also do).Any help in this regard would be appreciated.

Rangan
srinivasa.rangan@gmail.com
 
srinivasa.rangan@gmail.com wrote:
hi
I need to divide two 10 bit numbers.I would like to know if any kind of
chip is readily available or what would be the best circuit for
implementing this(A circuit for a higher number of bits like 16 will
also do).Any help in this regard would be appreciated.

Rangan
srinivasa.rangan@gmail.com
Click to expand...
Ten bits is not that many more than eight, so a four-way conditional
test may be simplest.

Use a PIC.


--
Many thanks,

Don Lancaster
Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
voice: (928)428-4073 email: don@tinaja.com

Please visit my GURU's LAIR web site at http://www.tinaja.com
 
srinivasa.rangan@gmail.com wrote:

hi
I need to divide two 10 bit numbers.I would like to know if any kind of
chip is readily available or what would be the best circuit for
implementing this(A circuit for a higher number of bits like 16 will
also do).Any help in this regard would be appreciated.
Click to expand...
The best 'circuit' to do this involves a microprocessor.

Graham
 
On 20 Aug 2005 10:46:54 -0700, srinivasa.rangan@gmail.com wrote:

hi
I need to divide two 10 bit numbers.I would like to know if any kind of
chip is readily available or what would be the best circuit for
implementing this(A circuit for a higher number of bits like 16 will
also do).Any help in this regard would be appreciated.
Click to expand...
---
In what amount of time would you like the division to be completed?

--
John Fields
Professional Circuit Designer
 
Pooh Bear wrote...
srinivasa.rangan@gmail.com wrote:

I need to divide two 10 bit numbers.I would like to know if any kind
of chip is readily available or what would be the best circuit for
implementing this(A circuit for a higher number of bits like 16 will
also do).Any help in this regard would be appreciated.

The best 'circuit' to do this involves a microprocessor.
Click to expand...
Two 16-bit D-A converters, a precision analog multiplier, wired as a
divider, plus a 12-bit A-D, with 10-bit truncation. Superior. :>)


--
Thanks,
- Win
 
On 20 Aug 2005 16:26:21 -0700, Winfield Hill
<Winfield_member@newsguy.com> wrote:

Pooh Bear wrote...

srinivasa.rangan@gmail.com wrote:

I need to divide two 10 bit numbers.I would like to know if any kind
of chip is readily available or what would be the best circuit for
implementing this(A circuit for a higher number of bits like 16 will
also do).Any help in this regard would be appreciated.

The best 'circuit' to do this involves a microprocessor.

Two 16-bit D-A converters, a precision analog multiplier, wired as a
divider, plus a 12-bit A-D, with 10-bit truncation. Superior. :>)
Click to expand...
Ah, but that's the quotient. Let's say we also want the exact
remainder, as a separate analog output....

Jon
 
On 20 Aug 2005 16:26:21 -0700, the renowned Winfield Hill
<Winfield_member@newsguy.com> wrote:

Pooh Bear wrote...

srinivasa.rangan@gmail.com wrote:

I need to divide two 10 bit numbers.I would like to know if any kind
of chip is readily available or what would be the best circuit for
implementing this(A circuit for a higher number of bits like 16 will
also do).Any help in this regard would be appreciated.

The best 'circuit' to do this involves a microprocessor.

Two 16-bit D-A converters, a precision analog multiplier, wired as a
divider, plus a 12-bit A-D, with 10-bit truncation. Superior. :>)
Click to expand...
Two M27C801s. Quotient in <100ns for 11.50 in single quantity.
 
If the ouptut is obtained by around 500ms it is good enough.I dont want
to use a microcontroller or anything because i feel that it would be an
overkill.Also the quotient is good enough for me.
Thanks
Rangan
srinivasa.rangan@gmail.com
 
On 20 Aug 2005 10:46:54 -0700, srinivasa.rangan@gmail.com wrote:

I need to divide two 10 bit numbers.I would like to know if any kind of
chip is readily available or what would be the best circuit for
implementing this(A circuit for a higher number of bits like 16 will
also do).Any help in this regard would be appreciated.
Click to expand...
So 20 input pins and 10 output pins? With pwr and gnd, 32 pins at
least. An Atmel AT89S51-24 is $1.89 in ones, they have hundreds in
stock right now. I believe it has enough pins, 40DIP, 44TQFP, 44PLCC
all available, an internal oscillator so all you need is Vcc and gnd,
32 I/O for a control line and status line plus the required data
paths, and way too much code space and ram for your needs. Easily can
do the divide for you in the required time.

You will be hard pressed for cheaper or fewer parts or better
availability in small numbers and all digital.

Jon
 
Spehro Pefhany wrote:

On 20 Aug 2005 16:26:21 -0700, the renowned Winfield Hill
Winfield_member@newsguy.com> wrote:

Pooh Bear wrote...

srinivasa.rangan@gmail.com wrote:

I need to divide two 10 bit numbers.I would like to know if any kind
of chip is readily available or what would be the best circuit for
implementing this(A circuit for a higher number of bits like 16 will
also do).Any help in this regard would be appreciated.

The best 'circuit' to do this involves a microprocessor.

Two 16-bit D-A converters, a precision analog multiplier, wired as a
divider, plus a 12-bit A-D, with 10-bit truncation. Superior. :>)

Two M27C801s. Quotient in <100ns for 11.50 in single quantity.
Click to expand...
That's a look-up table and a half for sure !

Graham
 
Jonathan Kirwan wrote:

On 20 Aug 2005 10:46:54 -0700, srinivasa.rangan@gmail.com wrote:

I need to divide two 10 bit numbers.I would like to know if any kind of
chip is readily available or what would be the best circuit for
implementing this(A circuit for a higher number of bits like 16 will
also do).Any help in this regard would be appreciated.

So 20 input pins and 10 output pins? With pwr and gnd, 32 pins at
least. An Atmel AT89S51-24 is $1.89 in ones, they have hundreds in
stock right now. I believe it has enough pins, 40DIP, 44TQFP, 44PLCC
all available, an internal oscillator so all you need is Vcc and gnd,
32 I/O for a control line and status line plus the required data
paths, and way too much code space and ram for your needs. Easily can
do the divide for you in the required time.

You will be hard pressed for cheaper or fewer parts or better
availability in small numbers and all digital.
Click to expand...
Ahhhh.... The good old 8051 family comes to the rescue. My fave ! Where do
you get the 89S51 for $1.89 though ? I'm using some 89S52s ? IIRC at the
moment on several projects and I pay rather more than that. From Farnell for
sure admittedly.


Graham
 
On Sun, 21 Aug 2005 06:42:43 +0100, Pooh Bear
<rabbitsfriendsandrelations@hotmail.com> wrote:

Jonathan Kirwan wrote:

On 20 Aug 2005 10:46:54 -0700, srinivasa.rangan@gmail.com wrote:

I need to divide two 10 bit numbers.I would like to know if any kind of
chip is readily available or what would be the best circuit for
implementing this(A circuit for a higher number of bits like 16 will
also do).Any help in this regard would be appreciated.

So 20 input pins and 10 output pins? With pwr and gnd, 32 pins at
least. An Atmel AT89S51-24 is $1.89 in ones, they have hundreds in
stock right now. I believe it has enough pins, 40DIP, 44TQFP, 44PLCC
all available, an internal oscillator so all you need is Vcc and gnd,
32 I/O for a control line and status line plus the required data
paths, and way too much code space and ram for your needs. Easily can
do the divide for you in the required time.

You will be hard pressed for cheaper or fewer parts or better
availability in small numbers and all digital.

Ahhhh.... The good old 8051 family comes to the rescue. My fave ! Where do
you get the 89S51 for $1.89 though ? I'm using some 89S52s ? IIRC at the
moment on several projects and I pay rather more than that. From Farnell for
sure admittedly.
Click to expand...
Digikey is where I was looking, as I posted. I should have noted who
it was when I said 'they.' What surprised me about this particular
part is that they are asking less than 6 cents/IOpin. That's about
half of what I usually expect to see.

Jon
 
Jonathan Kirwan wrote:

On Sun, 21 Aug 2005 06:42:43 +0100, Pooh Bear
rabbitsfriendsandrelations@hotmail.com> wrote:


Jonathan Kirwan wrote:

On 20 Aug 2005 10:46:54 -0700, srinivasa.rangan@gmail.com wrote:

I need to divide two 10 bit numbers.I would like to know if any kind of
chip is readily available or what would be the best circuit for
implementing this(A circuit for a higher number of bits like 16 will
also do).Any help in this regard would be appreciated.

So 20 input pins and 10 output pins? With pwr and gnd, 32 pins at
least. An Atmel AT89S51-24 is $1.89 in ones, they have hundreds in
stock right now. I believe it has enough pins, 40DIP, 44TQFP, 44PLCC
all available, an internal oscillator so all you need is Vcc and gnd,
32 I/O for a control line and status line plus the required data
paths, and way too much code space and ram for your needs. Easily can
do the divide for you in the required time.

You will be hard pressed for cheaper or fewer parts or better
availability in small numbers and all digital.

Ahhhh.... The good old 8051 family comes to the rescue. My fave ! Where do
you get the 89S51 for $1.89 though ? I'm using some 89S52s ? IIRC at the
moment on several projects and I pay rather more than that. From Farnell for
sure admittedly.

Digikey is where I was looking, as I posted. I should have noted who
it was when I said 'they.' What surprised me about this particular
part is that they are asking less than 6 cents/IOpin. That's about
half of what I usually expect to see.
Click to expand...
Ok - I see it. That's an awesome price. I'll have to investigate using Digikey
occasionally. Their site is rubbish compared to Farnell's though.

The Uk site gives Ł1.06 ea. Nice.

Now if I could find some other stuff to make the shipping worthwhile.....

Graham
 
srinivasa.rangan@gmail.com wrote:
If the ouptut is obtained by around 500ms it is good enough.I dont want
to use a microcontroller or anything because i feel that it would be an
overkill.Also the quotient is good enough for me.
Click to expand...
Overkill ? Come-on, a division is not 'that' simple (compared to an AND
or OR I mean, it's not _that_ difficult either).
A simple 8 bit uC with integrated oscillator will do the trick. That
cost very little, all you will need is that single component ! You will
need a programmer but you can do one easily with some resitors, a buffer
chip and your // port. As suggested, look at the Atmels, they have nice
stuff.

I don't know any chip that do the division and building one from other
chips, _that_ is overkill.


Regards,

Sylvain
 
On Sun, 21 Aug 2005 07:45:24 +0100, in sci.electronics.design Pooh
Bear <rabbitsfriendsandrelations@hotmail.com> wrote:

Jonathan Kirwan wrote:

On Sun, 21 Aug 2005 06:42:43 +0100, Pooh Bear
rabbitsfriendsandrelations@hotmail.com> wrote:


Jonathan Kirwan wrote:

On 20 Aug 2005 10:46:54 -0700, srinivasa.rangan@gmail.com wrote:

I need to divide two 10 bit numbers.I would like to know if any kind of
chip is readily available or what would be the best circuit for
implementing this(A circuit for a higher number of bits like 16 will
also do).Any help in this regard would be appreciated.

So 20 input pins and 10 output pins? With pwr and gnd, 32 pins at
least. An Atmel AT89S51-24 is $1.89 in ones, they have hundreds in
stock right now. I believe it has enough pins, 40DIP, 44TQFP, 44PLCC
all available, an internal oscillator so all you need is Vcc and gnd,
32 I/O for a control line and status line plus the required data
paths, and way too much code space and ram for your needs. Easily can
do the divide for you in the required time.

You will be hard pressed for cheaper or fewer parts or better
availability in small numbers and all digital.

Ahhhh.... The good old 8051 family comes to the rescue. My fave ! Where do
you get the 89S51 for $1.89 though ? I'm using some 89S52s ? IIRC at the
moment on several projects and I pay rather more than that. From Farnell for
sure admittedly.

Digikey is where I was looking, as I posted. I should have noted who
it was when I said 'they.' What surprised me about this particular
part is that they are asking less than 6 cents/IOpin. That's about
half of what I usually expect to see.

Ok - I see it. That's an awesome price. I'll have to investigate using Digikey
occasionally. Their site is rubbish compared to Farnell's though.

The Uk site gives Ł1.06 ea. Nice.

Now if I could find some other stuff to make the shipping worthwhile.....

Graham
add a couple of 74F181s' to the shopping list !
Click to expand...


martin
 
srinivasa.rangan@gmail.com wrote:

If the ouptut is obtained by around 500ms it is good enough.I dont want
to use a microcontroller or anything because i feel that it would be an
overkill.Also the quotient is good enough for me.
Click to expand...
A microcontroller is far and away the least expensive option.

Designing hardware maths is just plain *wrong*. Very component intensive
and expensive. Potentially *very* fast but you don't need that.

Graham
 
On Sun, 21 Aug 2005 07:45:24 +0100, Pooh Bear
<rabbitsfriendsandrelations@hotmail.com> wrote:

snip
Digikey is where I was looking, as I posted. I should have noted who
it was when I said 'they.' What surprised me about this particular
part is that they are asking less than 6 cents/IOpin. That's about
half of what I usually expect to see.

Ok - I see it. That's an awesome price. I'll have to investigate using Digikey
occasionally. Their site is rubbish compared to Farnell's though.

The Uk site gives Ł1.06 ea. Nice.

Now if I could find some other stuff to make the shipping worthwhile.....

Graham
Click to expand...
I just pulled the data sheet from Atmel. The oscillator was listed at
Digikey as being "Oscillator Type: Internal." See:

http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=364926&Row=255354&Site=US

However, a quick skim and I now think the data sheet disagrees with
Digikey. It looks like it needs a crystal. I should have guessed.

Well, that adds some cost and a part and there goes the 6 cents/IOpin.

Jon
 
Jonathan Kirwan wrote:

On Sun, 21 Aug 2005 07:45:24 +0100, Pooh Bear
rabbitsfriendsandrelations@hotmail.com> wrote:

snip
Digikey is where I was looking, as I posted. I should have noted who
it was when I said 'they.' What surprised me about this particular
part is that they are asking less than 6 cents/IOpin. That's about
half of what I usually expect to see.

Ok - I see it. That's an awesome price. I'll have to investigate using Digikey
occasionally. Their site is rubbish compared to Farnell's though.

The Uk site gives Ł1.06 ea. Nice.

Now if I could find some other stuff to make the shipping worthwhile.....

Graham

I just pulled the data sheet from Atmel. The oscillator was listed at
Digikey as being "Oscillator Type: Internal." See:

http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=364926&Row=255354&Site=US

However, a quick skim and I now think the data sheet disagrees with
Digikey. It looks like it needs a crystal. I should have guessed.

Well, that adds some cost and a part and there goes the 6 cents/IOpin.
Click to expand...
I normally use a resonator. Lower cost than a crytal and still accurate enough frequency
for most purposes.

Some low cost 8051 variants have internal RC oscillators. Didn't reckon the 89S51 did
though.

Graham
 
Sylvain Munaut wrote:

srinivasa.rangan@gmail.com wrote:

If the ouptut is obtained by around 500ms it is good enough.I dont want
to use a microcontroller or anything because i feel that it would be an
overkill.Also the quotient is good enough for me.


Overkill ? Come-on, a division is not 'that' simple (compared to an AND
snip
I don't know any chip that do the division and building one from other
chips, _that_ is overkill.
Click to expand...

I think the OP wants an off-the-shelf (OTS) solution.

Any kind of micro will require software programming and hardware
programming, then it can be wired into his circuit.

Unless anyone here has this device already programmed with docs and
application notes to wire it up and maybe a demo board in their back
pocket......

It’s clear that Srinivasa is a beginner.

So the long answer is "No" its not available OTS, but it can easily be
done if you are willing to learn a little and so some home work.

If Srinivasa is willing to learn, this is a good news group to ask
questions about getting your ideas and projects working.

I am sure many here have already did a napkin design on how they would
do it. ( I too have penciled out my own design I used and ATMega 32 :) )

Good Luck Srinivasa , I hope you success with your project.

Donald
 
In article <de8e6t02nsv@drn.newsguy.com>,
Winfield Hill <Winfield_member@newsguy.com> wrote:
Pooh Bear wrote...

srinivasa.rangan@gmail.com wrote:

I need to divide two 10 bit numbers.I would like to know if any kind
of chip is readily available or what would be the best circuit for
implementing this(A circuit for a higher number of bits like 16 will
also do).Any help in this regard would be appreciated.

The best 'circuit' to do this involves a microprocessor.

Two 16-bit D-A converters, a precision analog multiplier, wired as a
divider, plus a 12-bit A-D, with 10-bit truncation. Superior. :>)
Click to expand...
You don't really need a multiplier chip. If you use an ADC that takes an
external reference you can do something like this:

Ka/b
Vout
! /+!-- GND
+------+---< !
! ! \-!-+----/\/\/--- (-Va)
b ----- ! !
10bits ! REF ! ---!!---+
==========! ! !
! !---/\/\/----
-----
--
--
kensmith@rahul.net forging knowledge
 
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