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From: hull@hao.UUCP
Newsgroups: net.micro
Subject: Re: anyone know about a single chip 1200 baud modem?
Message-ID: <1059@hao.UUCP>
Date: Wed, 11-Jul-84 13:40:00 EDT
Article-I.D.: hao.1059
Posted: Wed Jul 11 13:40:00 1984
Date-Received: Tue, 17-Jul-84 01:26:53 EDT
References: <1143@druxu.UUCP>
Organization: High Altitude Obs./NCAR, Boulder CO
Lines: 58

A search of the 1984 IC MASTER revealed only two DIPS (in addition to the
Motorola MC6172 and MC6173 + host of interface and active filter DIPs
mentioned in previous replies).  EXAR makes a four-DIP 1200 baud Bell 212A
modulator/demodulator set:

EXAR Integrated Systems, Inc.
750 Palomar Avenue, Sunnyvale, CA 94088  Tel. 408-732-7970

XR-2120 PSK Filter
22-pin DIP, uses separately de-coupled transmit, receive, and digital power.
*On-board Crystal Oscillator with Buffered Output
*Internal Anti-Aliasing Filters
*Complete On-Board Output Active Filters
*Digitally Programmable Transmit and Receive Gains
*MODE Input Internally Switches Filters
  for Answer/Originate
*Single or Split Supply Operation
*Center Frequencies Movable with Input Clock
*High Impedance Inputs(100kOhm minimum)
*Low Supply Current
*1% Center Frequency Accuracy
*Separate CLK IN and CLK OUT Pins

XR-2121 Bell 212A Modulator (1200 baud DPSK or 300 baud FSK)
18-pin DIP, requires +5v and -5v power supplies.
*Bell Standard 212A Compatible
*6-Bit Synthesized Sine Wave Output
*Internal Scrambler
*Enable/Disable Input
*1200Hz Transmit Clock Output
*Crystal Controlled with Buffered Clock Output
*External Clock Input
*CMOS/TTL Compatible Inputs

XR-2122 Bell 212A Demodulator (1200 baud DPSK or 300 baud FSK)
22-pin DIP, requires +5v and -5v power supplies.
*Bell Standard 212A Compatible
*Automatic Speed Selection in Answer Mode
*36 dB (-9 to -45 dBm) Dynamic Range Input
*On-board Descrambler
*Carrier Detect Output
*Crystal Controlled Operation
*CMOS/TTL Compatible Inputs and Outputs

XR-2125 Sync/Async Converter
14-pin DIP, single +5v supply.
*Bell Standard 212A Compatible
*Enable/Disable Inputs
*Crystal Controlled Operation
*CMOS/TTL Compatible Inputs
*9 or 10 Bit Selection

Ok. I did not find a "single DIP 1200 baud modem".  When someone does make one,
it will probably have a package like the 64-pin Motorola 68000.  Anybody know
(since he apparently didn't remember) what DIP gary referred to in his posting?

							Howard Hull HAO/NCAR
{ihnp4!stcvax | decvax!stcvax | seismo} !hao!hull