73K322L
CCITT V.23, V.22, V.21
Single-Chip Modem
April 2000
DESCRIPTION
The 73K322L is a highly integrated single-chip
modem IC which provides the functions needed to
construct a CCITT V.23, V.22 and V.21 compatible
modem, capable of 1200 or 0-300 bit/s full-duplex
operation or 0-1200 bit/s half-duplex operation with
or without the back channel over dial-up lines. The
73K322L is an enhancement of the 73K221L single-
chip modem with performance characteristics
suitable for European and Asian telephone systems.
The 73K322L produces either 550 or 1800 Hz guard
tone, recognizes and generates a 2100 Hz answer
tone, and supports V.21 for 300 Hz FSK operation. It
also operates in V.23, 1200 bit/s FSK mode. The
73K322L 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 PLCC or DIP
package. The 73K322L operates from a single +5V
supply with very low power consumption.
The 73K322L 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,
calling and 550 or 1800 Hz guard tone. This device
supports V.23, V.22 (except mode v) and V.21
modes of operation, allowing both synchronous and
(continued)
FEATURES
• One-chip CCITT V.23, V.22 and V.21 ITU
compatible modem data pump
• Full-duplex operation at 0-300 bit/s (FSK) or 600
and 1200 bit/s (DPSK) or 0-1200 bit/s (FSK)
forward channel with or without 0-75 bit/s back
channel
• 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
• Call progress, carrier, precise answer tone (2100
Hz), calling tone (1300 Hz) and FSK mark
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 from a single power supply
• Surface mount PLCC package available
BLOCK DIAGRAM
DIGITAL
PROCESSING
DTMF &
TONE
GENERATORS
FSK
MODULATOR/
DEMODULATOR
PSK
MODULATOR/
DEMODULATOR
SMART
DIALING
&
DETECT
FUNCTIONS
POWER
TESTS:
ALB, DLB
RDLB
PATTERNS
TRANSMIT
FILTER
DATA
BUS
BUFFER
READ
WRITE
CONTROL
LOGIC
STATUS
AND
CONTROL
LOGIC
8-BIT
BUS
FOR
CONTROL
AND
STATUS
SERIAL
PORT
FOR
DATA
TXA
RXA
ISET
VDD
VREF
GND
RXCLK
CLOCK
GENERATOR
TL2
TL1
CLK
TXCLK
EXCLK
RD
WR
ALE
CS
RESET
INT
TXD
RXD
AD0-AD7
RECEIVE
FILTER
