73K321L Datasheet, PDF (1/24 Pages) TDK Electronics – CCITT V.23, V.21 Single-Chip Modem

73K321L
CCITT V.23, V.21
Single-Chip Modem
DESCRIPTION
FEATURES
April 2000
The 73K321L is a highly integrated single-chip
modem IC which provides the functions needed to
construct a CCITT V.23 and V.21 compatible
modem, capable of 0-300 bit/s full-duplex or 0-1200
bit/s half-duplex operation over dial-up telephone
lines. The 73K321L provides 1200 bit/s operation in
V.23 mode and 300 bit/s in V.21 mode. The
73K321L also can both detect and generate the
2100 Hz answer tone needed for call initiation. The
73K321L 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 73K321L operates from a single +5V
supply with very low power consumption.
The
73K321L
includes
the
FSK
modulator/demodulator functions, call progress and
handshake tone monitor test modes, and a tone
generator capable of producing DTMF, answer,
calling tones. The 73K321L 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 control
bus. An ALE control line simplifies address
demultiplexing. Data communications occurs
through a separate serial port only.
(continued)
• One-chip CCITT V.23 and V.21 standard
compatible modem data pump
• Full-duplex operation at 0-300 bit/s (V.21) or
0-1200 bit/s (V.23) forward channel with or
without 0-75 bits/s back channel
• Full Duplex 0-1200 bit/s (V.23) in 4-wire mode
• Pin and software compatible with other TDK
Semiconductor Corporation K-Series 1-chip
modems
• Interfaces directly with standard micro-
processors (8048, 80C51 typical)
• Serial port for data transfer
• Call progress, carrier, precise answer tone
(2100 Hz), calling tone (1300 Hz) and FSK
mark detectors
• DTMF generator
• 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 from a
single power supply
BLOCK DIAGRAM
AD0-AD7
RD
WR
ALE
CS
RESET
INT
TXD
RXD
DATA
BUS
BUFFER
READ
WRITE
CONTROL
LOGIC
STATUS
AND
CONTROL
LOGIC
8-BIT
BUS
FOR
CONTROL
AND
STATUS
SERIAL
PORT
FOR
DATA
FSK
MODULATOR/
DEMODULATOR
TESTS:
ALB,DLB
RDLB
PATTERNS
CLOCK
GENERATOR
SMART
DIALING
&
DETECT
FUNCTIONS
POWER
DTMF &
TONE
GENERATORS
TRANSMIT
FILTER
RECEIVE
FILTER
TXA
RXA