73K224BL Hybrid Datasheet

73K224BL Datasheet, PDF, Equivalent


Part Number

73K224BL

Description

Single-Chip Modem w/ Integrated Hybrid

Manufacture

TDK

Total Page 30 Pages
Datasheet
Download 73K224BL Datasheet


73K224BL
73K224BL
V.22bis/V.22/V.21/Bell 212A/103
Single-Chip Modem w/ Integrated Hybrid
DESCRIPTION
The 73K224BL is a highly integrated single-chip
modem IC which provides the functions needed to
construct a V.22bis compatible modem, capable of
2400 bit/s full-duplex operation over dial-up lines.
The 73K224BL is an enhancement of the 73K224L
single-chip modem which adds the hybrid hook
switch control, and driver to the 73K224L. The
73K224BL 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 73K224BL operates from a single +5 V supply
for low power consumption.
The 73K224BL 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
April 2000
Includes features of 73K224L single-chip
modem
On chip 2-wire/4-wire hybrid driver and off
hook relay buffer driver
One-chip multi-mode V.22bis/V.22/V.21 and
Bell 212A/103 compatible modem data pump
FSK (300 bit/s), DPSK (600, 1200 bit/s), or
QAM (2400 bit/s) encoding
Software compatible with other TDK
Semiconductor K-Series one-chip modems
Interfaces directly with standard micro-
processors (80C51 typical)
Parallel or serial bus for control
Selectable internal buffer/debuffer and
scrambler/descrambler functions
All asynchronous and synchronous
operating modes (internal, external, slave)
(continued)
BLOCK DIAGRAM
OH
8-BIT
µP
BUS
INTERFACE
TXD
RXD
SERIAL
INTERFACE
FSK
MODULATOR
DTMF,
ANSWER,
GUARD &
CALLING
TONE
GENERATOR
BUFFER
SCRAMBLER
DI-BIT/
QUAD-BIT
ENCODER
FIR
PULSE
SHAPER
QAM/
DPSK
MODULATOR
EQUALIZER
FILTER
FILTER
ATTENUATOR
DEBUFFER
DESCRAMBLER
DI-BIT/
QUAD-BIT
DECODER
DIGITAL
SIGNAL
PROCESSOR
RECEIVE
FUNCTIONS
TONE
DETECTION
FILTER
A/D
EQUALIZER
FIXED
DEMODULATOR
FILTER
AGC
2W/4W
HYBRID
GAIN
BOOST
FILTER
TXA1
TXA2
RXA

73K224BL
73K224BL
V.22bis/V.22/V.21/Bell 212A/103
Single-Chip Modem w/ Integrated Hybrid
DESCRIPTION (continued)
The 73K224BL is pin and software compatible with
the 73K222BL, allowing system upgrades with a
single component change.
The 73K224BL is designed to be a complete
V.22bis compatible modem on a chip. The
complete modem requires only the addition of the
phone line interface, a control microprocessor, and
RS-232 level converter for a typical system. Many
functions were included to simplify implementation
of typical modem designs. In addition to the basic
2400 bit/s QAM, 600/1200 bit/s DPSK and 300
bit/s FSK modulator/demodulator sections, the
device also includes synch/asynch converters,
scrambler/descrambler, call progress tone detect,
DTMF tone generator capabilities and handshake
pattern detectors. Test features such as analog
loop, digital loop, and remote digital loopback are
supported. Internal pattern generators are also
included for self-testing.
FEATURES (continued)
Adaptive equalization for optimum perform-
ance over all lines
Programmable transmit attenuation (16 dB,
1 dB steps), selectable receive boost (+18
dB)
Call progress, carrier, answer tone,
unscrambled mark, S1, and signal quality
monitors
DTMF, answer and guard tone generators
Test modes available: ALB, DL, RDL, mark,
space, alternating bit, S1 pattern generation
and detection
CMOS technology for low power
consumption (typically 100 mW @ 5 V) with
power-down mode (15 mW @ 5 V)
TTL and CMOS compatible inputs and
outputs
FUNCTIONAL DESCRIPTION
HYBRID AND RELAY DRIVER
To make designs more cost effective and space
efficient, the 73K224BL includes the 2-wire to 4-
wire hybrid with sufficient drive to interface directly
to the telecom coupling transformers. In addition,
an off hook relay driver with 30mA drive capability
is also included to allow use of commonly
available mechanical telecom relays.
QAM MODULATOR/DEMODULATOR
The 73K224BL encodes incoming data into quad-
bits represented by 16 possible signal points with
specific phase and amplitude levels. The base-
band signal is then filtered to reduce intersymbol
interference on the band limited telephone
network. The modulator transmits this encoded
data using either a 1200 Hz (originate mode) or
2400 Hz (answer mode) carrier. The demodulator,
although more complex, essentially reverses this
procedure while also recovering the data clock
from the incoming signal. Adaptive equalization
corrects for varying line conditions by
automatically changing filter parameters to
compensate for line characteristics.
DPSK MODULATOR/DEMODULATOR
The 73K224BL modulates a serial bit stream into
di-bit pairs that are represented by four possible
phase shifts as prescribed by the Bell 212A/V.22
standards. The base-band signal is then filtered to
reduce intersymbol interference on the bandlimited
2-wire PSTN line. Transmission occurs on either a
1200 Hz (originate mode) or 2400 Hz carrier
(answer mode). Demodulation is the reverse of
the modulation process, with the incoming analog
signal eventually decoded into di-bits and
converted back to a serial bit stream. The
demodulator also recovers the clock which was
encoded into the analog signal during modulation.
Demodulation occurs using either a 1200 Hz
carrier (answer mode or ALB originate mode) or a
2400 Hz carrier (originate mode or ALB answer
mode). Adaptive equalization is also used in
DPSK modes for optimum operation with varying
line conditions.
FSK MODULATOR/DEMODULATOR
The FSK modulator produces a frequency
modulated analog output signal using two discrete
frequencies to represent the binary data. The Bell
103 standard frequencies of 1270 and 1070 Hz
2


Features 73K224BL V.22bis/V.22/V.21/Bell 212A/103 Single-Chip Modem w/ Integrated Hybrid DESCRIPTION The 73K224BL is a highly integrated single-chip modem IC which p rovides the functions needed to constru ct a V.22bis compatible modem, capable of 2400 bit/s full-duplex operation ove r dial-up lines. The 73K224BL is an enh ancement of the 73K224L single-chip mod em which adds the hybrid hook switch co ntrol, and driver to the 73K224L. The 7 3K224BL integrates analog, digital, and switchedcapacitor array functions on a single chip, offering excellent perfor mance and a high level of functional in tegration in a 32-Lead PLCC and 44-Lead TQFP package. The 73K224BL operates fr om a single +5 V supply for low power c onsumption. The 73K224BL is designed to appear to the systems designer as a mi croprocessor peripheral, and will easil y interface with popular single-chip mi croprocessors (80C51 typical) for contr ol of modem functions through its 8-bit multiplexed address/data bus or via an optional serial control.
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