73K221AL
CCITT V.22, V.21
Single-Chip Modem
January 1999
DESCRIPTION
FEATURES
The 73K221AL is a highly integrated single-chip
modem IC which provides the functions needed to
construct a CCITT V.22 and V.21 compatible
modem, capable of 1200 or 0-300 bit/s full-duplex
operation over dial-up lines. The 73K221AL is an
enhancement of the 73K212L single-chip modem
with performance characteristics suitable for
European and Asian telephone systems. The
73K221AL produces either 550 or 1800 Hz guard
tone, recognizes and generates a 2100 Hz answer
tone, and allows V.21 for 300 Hz FSK operation.
The 73K221AL 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.
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One-chip CCITT V.22 and V.21 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
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Interfaces directly with standard micro-
controllers (8048, 80C51 typical)
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Serial port for data transfer
Both Synchronous and Asynchronous modes
of operation
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Call progress, carrier, precise answer tone
(2100 Hz), and long loop detectors
DTMF, and 550 or 1800 Hz guard tone
generators
The 73K221AL includes the DPSK and FSK
modulator/demodulator functions, call progress and
handshake tone monitor test modes, and a tone
generator capable of producing DTMF, answer and
550 or 1800 Hz guard tone. This device supports
V.22 (except mode v) and V. 21 modes of operation,
allowing both synchronous and asynchronous
communications. The 73K221AL is designed to
appear to the systems designer as a microprocessor
peripheral, and will easily interface with popular one-
Test modes available: ALB, DL, RDL, Mark,
Space, Alternating bit patterns
Precise automatic gain control allows 45 dB
dynamic range
Space efficient 28-pin DIP or 28-Pin PLCC
packages
CMOS technology for low power consumption
using 60 mW @ 5V
Single +5 volt supply
(continued)
BLOCK DIAGRAM
DATA
8-BIT
DTMF &
TONE
BUS
AD0-AD7
BUFFER
GENERATORS
BUS
FSK
MODULATOR/
DEMODULATOR
FOR
TRANSMIT
FILTER
READ
WRITE
CONTROL
LOGIC
TXA
CONTROL
ALE
DIGITAL
PROCESSING
PSK
MODULATOR/
DEMODULATOR
AND
RECEIVE
FILTER
RXA
RESET
STATUS
STATUS
AND
CONTROL
LOGIC
SMART
DIALING
&
DETECT
FUNCTIONS
SERIAL
PORT
FOR
TESTS:
ALB, DLB
RDLB
TXD
RXD
DATA
PATTERNS
CLOCK
GENERATOR
POWER