73K222AL Modem Datasheet

73K222AL Datasheet, PDF, Equivalent


Part Number

73K222AL

Description

Single-Chip Modem

Manufacture

TDK

Total Page 28 Pages
Datasheet
Download 73K222AL Datasheet


73K222AL
73K222AL
V.22, V.21, Bell 212A, 103
Single-Chip Modem
DESCRIPTION
The 73K222AL is a highly integrated single-chip
modem IC which provides the functions needed to
construct a CCITT V.22, V.21 and Bell 212A
compatible modem, capable of 1200 bit/s full-duplex
operation over dial-up lines. The 73K222AL is an
enhancement of the 73K212L/AL single-chip modem
which adds V.22 and V.21 modes to the Bell 212A and
103 operation of the 73K212AL. In Bell 212A mode,
the 73K222AL provides the normal Bell 212A and 103
functions and employs a 2225 Hz answer tone. The
73K222AL in V.22 mode produces either 550 or 1800
Hz guard tone, recognizes and generates a 2100 Hz
answer tone, and allows 600 bit/s V.22 or 0-300 bit/s
V.21 operation. The 73K222AL 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, PLCC and 44-pin TQFP configuration. The
73K222AL operates from a single +5V supply. The
73K222AL is a new version replacing the 73K222L.
The 73K222AL should be specified for all new
designs.
The 73K222AL includes the DPSK and FSK
modulator/demodulator functions, call progress and
handshake tone monitor and a tone generator capable
of tone required for European applications.
(continued)
FEATURES
April 2000
One-chip CCITT V.22, V.21, Bell 212A and Bell
103 standard compatible modem data pump
Full-duplex operation at 0-300 bit/s (FSK) or 600
and 1200 bit/s (DPSK)
Pin and software compatible with other TDK
Semiconductor Corporation K-Series 1-chip
modems
Interfaces
directly
with
standard
microprocessors (8048, 80C51 typical)
Serial or parallel microprocessor bus for control
Serial port for data transfer
Both synchronous and asynchronous modes of
operation including V.22 extended overspeed
Call progress, carrier, precise answer tone
(2100 or 2225 Hz), and long loop detectors
DTMF, and 550 or 1800 Hz guard tone
generators
Test modes available: ALB, DL, RDL, Mark,
Space, Alternating bit patterns
Precise automatic gain control allows 45 dB
dynamic range
CMOS technology for low power consumption
using 60 mW @ 5V
Single +5 volt supply
PLCC and PDIP packages
AD0-AD7
RD
WR
ALE
CS
RESET
INT
TXD
RXD
DATA
BUS
BUFFER
READ
WRITE
CONTROL
LOGIC
STATUS
AND
CONTROL
LOGIC
BLOCK DIAGRAM
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

73K222AL
73K222AL
V.22, V.21, Bell 212A, 103
Single-Chip
DESCRIPTION (continued)
This device supports V.22 (except mode v) and V. 21
modes of operation, allowing both synchronous and
asynchronous communications. Test features such as
analog loop, digital loop, and remote digital loopback are
supported. Internal pattern generators are also included for
self-testing. The 73K222AL 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 serial control bus. An
ALE control line simplifies address demultiplexing. Data
communications occurs through a separate serial port only.
The 73K222AL is ideal for use in either free standing or
integral system modem products where full-duplex 1200
bit/s data communications over the 2-wire switched
telephone network 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 control microprocessor, and RS-232 level
converter for a typical system. The 73K222AL is part of
TDK Semiconductor Corporation's 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
73K222AL includes ASYNC/SYNC and SYNC/ASYNC
converters which delete or insert stop bits in order to
transmit data within a ±0.01% 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 or 600 bit/s +1.0%, -2.5%. The converter will
then insert or delete stop bits in order to output a signal
which is 1200 or 600 bit/s ± 0.01% (± 0.01% is required
synchronous data rate accuracy).
The serial data stream from the ASYNC/SYNC
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. The ASYNC/SYNC
converter and the data scrambler are bypassed in all
FSK modes. 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
2
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 SYNC/ASYNC
convertor will reinsert any deleted stop bits and
transmit 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.
The SYNC/ASYNC converter also has an
extended overspeed mode which allows selection
of an overspeed range of either +1% or +2.3%. In
the extended overspeed mode, stop bits are
output at 7/8 the normal width.
SYNCHRONOUS MODE
The CCITT V.22 standard defines synchronous
operation at 600 and 1200 bit/s. The Bell 212A
standard defines synchronous operation only 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
The 73K222AL modulates a serial bit stream into
di-bit pairs that are represented by four possible
phase shifts as prescribed by the Bell 212A or
V.22 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 carrier (answer mode). Demodulation is
the reverse of the modulation process, with the
incoming analog signal eventually decoded into di-
bits and converted back to a serial bit stream. The
demodulator also recovers the clock which was
encoded into the analog signal during modulation.
Demodulation occurs using either a 1200 Hz
carrier (answer mode or ALB originate mode) or a


Features 73K222AL V.22, V.21, Bell 212A, 103 Sing le-Chip Modem DESCRIPTION The 73K222AL is a highly integrated single-chip mod em IC which provides the functions need ed to construct a CCITT V.22, V.21 and Bell 212A compatible modem, capable of 1200 bit/s full-duplex operation over d ial-up lines. The 73K222AL is an enhanc ement of the 73K212L/AL single-chip mod em which adds V.22 and V.21 modes to th e Bell 212A and 103 operation of the 73 K212AL. In Bell 212A mode, the 73K222AL provides the normal Bell 212A and 103 functions and employs a 2225 Hz answer tone. The 73K222AL in V.22 mode produce s either 550 or 1800 Hz guard tone, rec ognizes and generates a 2100 Hz answer tone, and allows 600 bit/s V.22 or 0-30 0 bit/s V.21 operation. The 73K222AL in tegrates analog, digital, and switched- capacitor array functions on a single s ubstrate, offering excellent performanc e and a high level of functional integr ation in a single 28-pin DIP, PLCC and 44-pin TQFP configuration. The 73K222AL operates from a single .
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