73K324L
CCITT V.22bis, V.22, V.21, V.23, Bell 212A
Single-Chip Modem
April 2000
DESCRIPTION
The 73K324L is a highly integrated single-chip
modem IC which provides the functions needed to
design a Quad-mode CCITT and Bell 212A
compatible modem capable of operation over dial-up
lines. The 73K324L adds V.23 capability to the
CCITT modes of TDK Semiconductor Corporation's
73K224 one-chip modem, allowing a one-chip
implementation in designs intended for European
markets which require this added Modulation mode.
The 73K324L offers excellent performance and a
high level of functional integration in a single IC. The
device supports V.22bis, V.22, Bell 212A, V.21, and
V.23 operating modes, allowing both synchronous
and asynchronous operation as defined by the
appropriate standard.
The 73K324L is designed to appear to the Systems
Engineer as a microprocessor peripheral, and will
easily interface with popular one-chip
microcontrollers (80C51 typical) for control of
modem functions through its 8-bit multiplexed
address/data bus. A serial control bus is available
for applications not requiring a parallel interface. An
optional package with only the serial control bus is
also available. Data communications occurs through
a separate serial port.
(continued)
FEATURES
• One chip Multi-mode CCITT V.22bis, V.22, V.21,
V.23 and Bell 212A compatible modem data pump
• FSK (75, 300, 1200 bit/s), DPSK (600, 1200 bit/s),
or QAM (2400 bit/s) encoding
• Pin and software compatible with other
TDK Semiconductor Corporation K-Series family
one-chip modems
• Interfaces directly with standard
microprocessors (8048, 80C51 typical)
• Serial and parallel microprocessor bus for
control
• Selectable asynch/synch with internal
buffer/debuffer and scrambler/descrambler
functions
• All synchronous (internal, external, slave) and
Asynchronous Operating modes
• Adaptive equalization for optimum performance
over all lines
• Programmable transmit attenuation (16 dB, 1 dB
steps), and selectable receive boost (+18 dB)
• Call progress, carrier, answer tone, unscrambled
mark, S1, and signal quality monitors
• DTMF, answer, calling, SCT and guard tone
generators
• Test modes available: ALB, DL, RDL; Mark, Space
and Alternating bit pattern generators
• CMOS technology for low power consumption
(100 MW @ 5 V) with power-down mode
(15 mW @ 5V)
• 4-wire full duplex operation in all modes
BLOCK DIAGRAM
SERIAL
I/F
FSK
MODULATOR
DIBIT/
QUADBIT
ENCODER
FILTER
DEBUFFER
DIBIT/
QUADBIT
DECODER
DE-
SCRAMBLER
FILTER
FIR
PULSE
SHAPER
QAM/
DPSK
MODULATOR
EQUALIZER FILTER
TXA
DIGITAL
SIGNAL
PROCESSOR
RECEIVE
FUNCTIONS
A/D
EQUALIZER FILTER RXA
GAIN BOOST
TONE DETECTION
FIXED
DEMOD
FILTER
TXD
RXD
ATTEN
I/F
+ +BUFFER SCRAMBLER
DTMF,
ANSWER,
GUARD &
CALLING
TONE
GENERATOR
8 - BIT
P
BUS
m
AGC
6 dB6 dB
GAIN
BOOST