73K302L Modem Datasheet

73K302L Datasheet, PDF, Equivalent


Part Number

73K302L

Description

Single-Chip Modem

Manufacture

TDK

Total Page 28 Pages
Datasheet
Download 73K302L Datasheet


73K302L
DESCRIPTION
The 73K302L is a highly integrated single-chip
modem IC which provides the functions needed to
construct a Bell 202, 212A and 103 compatible
modem. The 73K302L is an enhancement of the
73K212L single-chip modem with Bell 202 mode
features added. The 73K302L is capable of 1200 or
0-300 bit/s full-duplex operation over dial-up lines.
4-wire full-duplex capability and a low speed back
channel are also provided in Bell 202 mode. The
73K302L recognizes and generates a 900 Hz soft
carrier turn-off tone, and allows 103 for 300 bit/s
FSK operation. The 73K302L integrates analog,
digital, and switched-capacitor array functions on a
single substrate, offering excellent performance and
a high level of functional integration in a single
28-pin DIP or PLCC package. The 73K302L
operates from a single +5V supply with very low
power consumption.
The 73K302L includes the DPSK and FSK
modulator/demodulator functions, call progress and
handshake tone monitors, test modes, and a tone
generator capable of producing DTMF, answer, and
900 Hz soft carrier turn-off tone. This device
supports Bell 202, 212A and 103 modes of
operation, allowing both synchronous and
(continued)
73K302L
Bell 212A, 103, 202
Single-Chip Modem
FEATURES
February 1998
One-chip Bell 212A, 103 and 202S/T standard
compatible modem data pump
Full-duplex operation at 0-300 bit/s (FSK), 1200 bit/s
(DPSK) or 0-1200 bit/s (FSK) forward channel with or
without 0-150 bit/s back channel
Full-duplex 4-wire operation in Bell 202 mode
Pin and software compatible with other TDK
Semiconductor Corporation K-Series 1-chip
modems
Interfaces directly with standard microprocessors
(8048, 80C51 typical)
Serial port for data transfer
Both synchronous and asynchronous modes of
operation
Call progress, carrier, precise answer tone
(2225 Hz), soft carrier turn-off (SCT), and FSK mark
detectors
DTMF, answer, and SCT tone generators
Test modes available: ALB, DL, RDL, Mark, Space,
Alternating bit patterns
CMOS technology for low power consumption using
60 mW @ 5V from a single power supply
BLOCK DIAGRAM
AD0-AD7
DATA
BUS
BUFFER
5'
:5
ALE
&6
RESET
READ
WRITE
CONTROL
LOGIC
,17
TXD
RXD
STATUS
AND
CONTROL
LOGIC
8-BIT
BUS
FOR
CONTROL
AND
STATUS
SERIAL
PORT
FOR
DATA
DIGITAL
PROCESSING
TESTS:
ALB, DLB
RDLB
PATTERNS
CLOCK
GENERATOR
FSK
MODULATOR/
DEMODULATOR
PSK
MODULATOR/
DEMODULATOR
SMART
DIALING
&
DETECT
FUNCTIONS
POWER
DTMF &
TONE
GENERATORS
TRANSMIT
FILTER
RECEIVE
FILTER
TXA
RXA

73K302L
73K302L
Bell 212A, 103, 202
Single-Chip Modem
DESCRIPTION (continued)
asynchronous communications. The 73K302L is
designed to appear to the systems designer as a
microprocessor peripheral, and will easily interface
with popular one-chip microprocessors (80C51
typical) for control of modem functions through its 8-
bit multiplexed address/data bus or via an optional
serial command bus. An ALE control line simplifies
address demultiplexing. Data communications
occurs through a separate serial port only.
The 73K302L is ideal for use in either free standing
or integral system modem products where multi-
standard data communications is desired. Its high
functionality, low power consumption and efficient
packaging simplify design requirements and
increase system reliability. A complete modem
requires only the addition of the phone line interface,
a modem controller, and RS232 level converter for a
typical system.
Tri-mode capability in one-chip allows full-duplex
Bell 212 and 103 operation or assymetrical Bell
202S operation over the 2-wire switched telephone
network. 202T mode full-duplex operation at 1200
bit/s is also possible when operating on 4-wire
leased lines.
A soft carrier turn-off feature facilitates fast line turn
around when using the 202S mode for half-duplex
applications.
The 73K302L is part of TDK Semiconduct K- Series
family of pin and function compatible single-chip
modem products. These devices allow systems to
be configured for higher speeds and Bell or CCITT
operation with only a single component change.
OPERATION
ASYNCHRONOUS MODE
Data transmission for the DPSK mode requires that
data ultimately be transmitted in a synchronous
fashion. The 73K302L includes ASYNC/SYNC and
SYNC/ASYNC converters which delete or insert stop
bits in order to transmit data at a regular rate. In
asynchronous mode the serial data comes from the
TXD pin into the ASYNC/SYNC converter. The
ASYNC/SYNC converter accepts the data provided
on the TXD pin which normally must be 1200 bit/s
+1.0%, 2.5%. The rate converter will then insert or
delete stop bits in order to output a signal which is
1200 bit/s ± .01% (±0.01% is the required
synchronous data rate accuracy).
The SYNC/ASYNC converter also has an extended
overspeed mode which allows selection of an output
overspeed range of either +1% or +2.3%. In the
extended overspeed mode, stop bits are output at
7/8 the normal width.
The serial data stream from the transmit buffer or the
rate converter is passed through the data scrambler
and onto the analog modulator. The data scrambler
can be bypassed under processor control when
unscrambled data must be transmitted. If serial input
data contains a break signal through one character
(including start and stop bits) the break will be
extended to at least 2 times N + 3 bits long (where N
is the number of transmitted bits/character).
Serial data from the demodulator is passed first
through the data descrambler and then through the
SYNC/ASYNC converter. The ASYNC/ASYNC
converter will reinsert any deleted stop bits and output
data at an intra-character rate (bit-to-bit timing) of no
greater than 1219 bit/s. An incoming break signal (low
through two characters) will be passed through
without incorrectly inserting a stop bit.
SYNCHRONOUS MODE
The Bell 212A standard defines synchronous
operation at 1200 bit/s. Operation is similar to that of
the asynchronous mode except that data must be
synchronized to a provided clock and no variation in
data transfer rate is allowable. Serial input data
appearing at TXD must be valid on the rising edge of
TXCLK.
TXCLK is an internally derived signal in internal
mode and is connected internally to the RXCLK pin
in slave mode. Receive data at the RXD pin is
clocked out on the falling edge of RXCLK. The
ASYNCH/SYNCH converter is bypassed when
synchronous mode is selected and data is
transmitted out at the same rate as it is input.
DPSK MODULATOR/DEMODULATOR
In DPSK mode the 73K302L modulates a serial bit
stream into di-bit pairs that are represented by four
possible phase shifts as prescribed by the Bell 212A
standards. The baseband signal is then filtered to
reduce intersymbol interference on the bandlimited
2-wire telephone line. Transmission occurs using
either a 1200 Hz (originate mode) or 2400 Hz
(answer mode) carrier. Demodulation is the reverse
of the modulation process, with the incoming analog
2


Features DESCRIPTION The 73K302L is a highly inte grated single-chip modem IC which provi des the functions needed to construct a Bell 202, 212A and 103 compatible mode m. The 73K302L is an enhancement of the 73K212L single-chip modem with Bell 20 2 mode features added. The 73K302L is c apable of 1200 or 0-300 bit/s full-dupl ex operation over dial-up lines. 4-wire full-duplex capability and a low speed back channel are also provided in Bell 202 mode. The 73K302L recognizes and g enerates a 900 Hz soft carrier turn-off tone, and allows 103 for 300 bit/s FSK operation. The 73K302L integrates anal og, digital, and switched-capacitor arr ay functions on a single substrate, off ering excellent performance and a high level of functional integration in a si ngle 28-pin DIP or PLCC package. The 73 K302L operates from a single +5V supply with very low power consumption. The 7 3K302L includes the DPSK and FSK modula tor/demodulator functions, call progres s and handshake tone monitors, test modes, and a tone generator.
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