D
David Eather
Guest
Can anyone suggest a single chip 2400 baud modem solution please?
(sorry to repeat myself)
(sorry to repeat myself)
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
I should also add in small quantity, PDIP, SOIC or TQFP preferableCan anyone suggest a single chip 2400 baud modem solution please?
(sorry to repeat myself)
These days? Either a really old chip that's still in production, or aOn 17/05/2010 10:27 PM, David Eather wrote:
Can anyone suggest a single chip 2400 baud modem solution please?
(sorry to repeat myself)
I should also add in small quantity, PDIP, SOIC or TQFP preferable
What can I say? I'm a man of the 20th century - it's just a pity were inDavid Eather wrote:
On 17/05/2010 10:27 PM, David Eather wrote:
Can anyone suggest a single chip 2400 baud modem solution please?
(sorry to repeat myself)
I should also add in small quantity, PDIP, SOIC or TQFP preferable
These days? Either a really old chip that's still in production,
Yep, tried them. No real luck. I came to the same conclusion offairly new microprocessor with an ADC and some appropriate code.
Have you looked at the usual suspects? National Semi, ON, Fairchild? At
one point there were a number of these chips to be had, all (IIRC)
either 24- or 40-pin PDIP parts.
After more searching and re-examining the project assumptions I foundbecome a victim of advancing technology: this is something that you
could easily do in one corner of an ASIC that's also capable of 38.4k,
56k, and auto-negotiated speeds. So I don't know if anyone still makes
them outside the context of one-chip Hayes compatible telephone modems.
ummm..... no.If all you want to do is just a cruddy V.22bis 2400 baud modem, and you
don't want to haunt back-ally gray-market used semiconductor brokers,
I had come down to thinking my options were just that, or to go and buyconsider that this is an easy task to accomplish with either a
ridiculously small DSP chip or fairly accomplished microprocessor.
There's a lot of details to get the procedural signaling correct, but
the actual signal processing would be a snap for the right guy*. In
fact, if you can't find a new modem to do this for you, this is probably
the reason.
I have some experience with PIC's but was also coming to that conclusion.I did a quick search to remind myself just what the standard was, and
found at least one vendor that'll sell you modem software -- although by
the time you've gotten your system twisted around to match their
assumptions, you may have wasted more time than it'd take to roll your
own, and spent licensing money to boot.
Shameless plug welcomed. Thanks for your answers, experience and* Like me. Since you have given me this outstanding opportunity for a
shameless plug I'll take it: contact me if you want to roll your own,
but don't feel up to writing the signal processing code.
Pull open a set-top box and see what it uses. A Samsung STBCan anyone suggest a single chip 2400 baud modem solution please?
I should also add in small quantity, PDIP, SOIC or TQFP preferable
The Si3015 is no longer available - but it did lead to some great SiOn May 17, 5:30 am, David Eather<eat...@tpg.com.au> wrote:
Can anyone suggest a single chip 2400 baud modem solution please?
I should also add in small quantity, PDIP, SOIC or TQFP preferable
Pull open a set-top box and see what it uses. A Samsung STB
I have handy has Si2400 and Si3015 on the telephone port.
It seems to me that many alarm systems still incorporate a 2400 baudOn 20/05/2010 4:51 AM, whit3rd wrote:
On May 17, 5:30 am, David Eather<eat...@tpg.com.au> wrote:
Can anyone suggest a single chip 2400 baud modem solution please?
I should also add in small quantity, PDIP, SOIC or TQFP preferable
Pull open a set-top box and see what it uses. A Samsung STB
I have handy has Si2400 and Si3015 on the telephone port.
The Si3015 is no longer available - but it did lead to some great Si chips
sets to do the job - thanks
Alarm systems, POS systems, ATMs... For small payloads 2400bps (FSK, etc.) is"David Eather" <eather@tpg.com.au> wrote in message
newscOdneWgH5-p6GnWnZ2dnUVZ_u8AAAAA@giganews.com...
On 20/05/2010 4:51 AM, whit3rd wrote:
On May 17, 5:30 am, David Eather<eat...@tpg.com.au> wrote:
Can anyone suggest a single chip 2400 baud modem solution please?
I should also add in small quantity, PDIP, SOIC or TQFP preferable
Pull open a set-top box and see what it uses. A Samsung STB
I have handy has Si2400 and Si3015 on the telephone port.
The Si3015 is no longer available - but it did lead to some great Si chips
sets to do the job - thanks
It seems to me that many alarm systems still incorporate a 2400 baud
modem chipset.