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'TCM 3105 still available?'
1998\04\04@162046 by homas Schleusener

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I need a radio modem to transmit data with  a 10mW FM rf-modul at 1200
Baud. I want to use the TCM3105, because there I have some applications
and it4s a cheap solution. I4ve tried to get the data sheet at TI4s web
site, the TCM3105 was not found. A friend  told me, that it is no longer
available from TI, but I found it in some catalogs. Does anybody know,
if it is available, if not, is there any other compatible part and where
to get a data sheet?

Thanks!

Thomas

1998\04\04@175705 by Mike Keitz

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On Sat, 4 Apr 1998 23:18:35 +0200 Thomas Schleusener
<spam_OUTThomas.SchleusenerTakeThisOuTspamT-ONLINE.DE> writes:
>I need a radio modem to transmit data with  a 10mW FM rf-modul at 1200
>Baud.

If you are able to specify the transmission method and control the radio
hardware design/connection, use direct FSK.  The cost approaches zero and
the performance better approaches ideal.

>I want to use the TCM3105, because there I have some
>applications
>and it4s a cheap solution.

The 3105 is not a good idea for new design.  TI has tried to discontinue
it several times.  If you must send 202 modem tones, consider a caller-ID
receiver chip such as the Motorola MC145447 for the demodulator and
implement the modulator directly from the PIC using any of several
sine-wave generator techniques.


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1998\04\04@185058 by H.Akgul

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Hi
It is available at some distributers. So I found some at my distributer and
price is around 10 usa $ if you need some please send e-mail to
.....aksoftKILLspamspam@spam@geocities.com
Huseyin  / TA2EH@TA2BBS.#ANK.TUR.EU
****
Thomas Schleusener wrote:

{Quote hidden}

1998\04\05@024831 by Norman Gillaspie

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I beleive the caller ID demod chips will fit the bill
for the receiver there is probably a corresponding
transmitter IC.

Norman

> {Original Message removed}

1998\04\06@181053 by paulb

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Mike Keitz wrote:

> If you must send 202 modem tones, consider a caller-ID receiver chip
> such as the Motorola MC145447 for the demodulator and implement the
> modulator directly from the PIC using any of several sine-wave
> generator techniques.

 OK, so how do I get a datasheet on this device?  I have had a couple
of attacks at the Motorola site and I cannot seem to access data sheets,
only various waffling articles and indexes.  has someone managed to get
*real* data?

 Cheers,
       Paul B.

1998\04\06@182113 by paulb

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Norman Gillaspie wrote:

> I believe the caller ID demod chips will fit the bill
> for the receiver there is probably a corresponding
> transmitter IC.

 Well, an XR2206 is specifically designed for this function, having a
sinewave output and a digital input which selects between two frequency
presets with phase coherence.  You need to tune it up with a frequency
counter, and it's not CMOS however so draws a few mA.  (It's very old!)

 Cheers,
       Paul B.

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