73K324BL
V.22bis/V.22/V.21/V.23 Bell 212A
Single-Chip Modem w/Integrated Hybrid
DESCRIPTION
The 73K324BL is a highly integrated single-chip
modem IC which provides the functions needed to
construct a V.22bis compatible modem, capable of
2400 bps full-duplex operation over dial-up lines. The
73K324BL is an enhancement of the 73K324L single-
chip modem which adds the hybrid hook switch
control, and driver to the 73K324L. The 73K324BL
integrates analog, digital, and switched-capacitor
array functions on a single chip, offering excellent
performance and a high level of functional integration
in a 32-Lead PLCC and 44-Lead TQFP package.
The 73K324BL operates from a single +5 V supply for
low power consumption.
The 73K324BL is designed to appear to the systems
designer as a microprocessor peripheral, and will
easily interface with popular single-chip micro-
processors (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 simplifies address demultiplexing. Data
communications normally occur through a separate
serial port.
(continued)
FEATURES
• Includes features of 73K324L single-chip
modem
• On chip 2-wire/4-wire hybrid driver and off
hook relay buffer
• One-chip multi-mode V.22bis/V.22/V.21/V.23
and Bell 212A compatible modem data pump
• FSK (300/1200 bps), DPSK (600, 1200 bps), or
QAM (2400 bps) encoding
• Software compatible with other Semi-
conductor K-Series one-chip modems
• Interfaces directly with standard micro-
processors (80C51 typical)
• Parallel or serial bus for control
• Selectable asynch/synch with internal
buffer/debuffer and scrambler/descrambler
functions
• All asynchronous and synchronous operating
modes (internal, external, slave)
(continued)
BLOCK DIAGRAM
DIGITAL
SIGNAL
PROCESSOR
RECEIVE
FUNCTIONS
DI-BIT/
QUAD-BIT
DECODER
TXD
RXD
SERIAL
INTERFACE
BUFFER
8-BIT
µP
BUS
INTERFACE
DEBUFFER DESCRAMBLER
EQUALIZER FILTER
FILTER
ANTI-ALIAS
FILTER
2W/4W
HYBRID
TXA1
TXA2
RXA
PASS
BAND
FILTER
EQUALIZER
A/D
FILTER
FIXED
DEMODULATOR
AGC
GAIN
BOOST
ATTENUATOR
TONE
DETECTION
OH
FIR
PULSE
SHAPER
QAM/
DPSK
MODULATOR
DI-BIT/
QUAD-BIT
ENCODER
FSK
MODULATOR
SCRAMBLER
DTMF,
ANSWER,
GUARD &
CALLING
TONE
GENERATOR
April 2000