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73K222AU-IP の電気的特性と機能

73K222AU-IPのメーカーはETCです、この部品の機能は「74ACT16254 Modem with UART」です。


製品の詳細 ( Datasheet PDF )

部品番号 73K222AU-IP
部品説明 74ACT16254 Modem with UART
メーカ ETC
ロゴ ETC ロゴ 




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73K222AU-IP Datasheet, 73K222AU-IP PDF,ピン配置, 機能
DESCRIPTION
The 73K222AU is a compact, high-performance
modem which includes a 8250A/16C450 compatible
UART with the 1200 bit/s modem function on a
single chip. Based on the 73K222L 5V low power
CMOS modem IC, the 73K222AU is the perfect
modem/UART component for integral modem
applications. It is ideal for applications such as
portable terminals and laptop computers. The
73K222AU is the first fully featured modem IC which
can function as an intelligent modem in integral
applications without requiring a separate dedicated
microcontroller. It provides for data communication
at 1200, 600, and 300 bit/s in a multi-mode manner
that allows operation compatible with both Bell
212A/103 and CCITT V.22/V.21 standards. The
digital interface section contains a high speed
version of the industry standard 8250A/16C450
UART, commonly used in personal computer
products. A unique feature of the 73K222AU is that
the UART section can be used without the modem
function, providing an additional asynchronous port
at no added cost. The 73K222AU is designed in
CMOS technology and operates from a single +5V
supply. Available packaging includes 40-pin DIP or
44-pin PLCC for surface mount applications.
73K222AU
Single-Chip Modem
Modem with UART
FEATURES
April 2000
Modem/UART combination optimized for
integral bus applications
Includes features of 73K222L single-chip modem
Fully compatible 16C450/8250 UART with
8250B or 8250A selectable interrupt emulation
High speed UART will interface directly with
high clock rate bus with no wait states
Single-port mode allows full modem and
UART control from CPU bus, with no
dedicated microprocessor required
Dual-port mode suits conventional designs
using local microprocessor for transparent
modem operation
Complete modem functions for 1200 bit/s (Bell
212A, V.22) and 0-300 bit/s (Bell 103, V.21)
Includes DTMF generator, carrier, call-
progress and precise answer-tone detectors
for intelligent dialing capability
On chip 2-wire/4-wire hybrid driver and off-
hook relay buffer
Speaker output with four-level software driven
volume control
Low power CMOS (40 mW) with power down
mode (15 mW)
Operates from single +5V supply
BLOCK DIAGRAM
TXD
XTL1 XTL2 CLK
UD0
UD1
UD2
UD3
UD4
UD5
UD6
UD7
UA0
UA1
UA2
1.8432 MHz
8250A / 16C450
UART
INTERNAL DATA
73K222AL
2W/4W
HYBRID
2
INT OUT1
RXD-INPUT
OH
RELAY
DRIVER
TXA1
TXA2
RXA
SPKR
( ) / MA0
( ) / MA1
(UA3) / MA2
DATA / ( )
/( )
/ (N/C)
( ) / DCLK
( )/
INTRPT ( ) PRST RESET RXD
VDD VREF GND ISET STNDLN

1 Page





73K222AU-IP pdf, ピン配列
PSK MODULATOR / DEMODULATOR
The 73K222AU modulates a serial bit stream into
dibit pairs that are represented by four possible
phase shifts as prescribed by the Bell 212A or V.22
standard. The baseband signal is then filtered to
reduce intersymbol interference on the band limited
2-wire PSTN line. Transmission occurs using 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 dibits and converted back to
a serial bit stream. The demodulator also recovers
the clock which was encoded into the analog signal
during modulation. The demodulator decodes either
a 1200 Hz carrier (originate carrier) or a 2400 Hz
carrier (answer carrier). The 73K222AU uses a
phase-locked-loop coherent demodulation technique
that offers inherently better performance than typical
DPSK demodulators used by other manufacturers.
FSK MODULATOR/DEMODULATOR
The FSK modulator frequency modulates the analog
output signal using two discrete frequencies to
represent the binary data. In Bell 103, the standard
frequencies of 1270 Hz and 1070 Hz (originate mark
and space) and 2225Hz and 2025 Hz (answer mark
and space) are used. V.21 mode uses 980 Hz and
1180 Hz (originate, mark and space) or 1650 Hz and
1850 Hz (answer, mark and space). Demodulation
involves detecting the received frequencies and
decoding them into the appropriate binary value.
PASSBAND FILTERS AND EQUALIZERS
A high and low band filter is included to shape the
amplitude and phase response of the transmit signal
and provide compromise delay equalization and
rejection of out-of-band signals in the receive
channel. Amplitude and phase equalization is
necessary to compensate for distortion of the
transmission line and to reduce intersymbol
interference in the band limited receive signal. The
transmit signal filtering approximates a 75% square
root of raised Cosine frequency response
characteristic.
AGC
The automatic gain control maintains a signal level
at the input to the demodulators which is constant to
within 1 dB. It corrects quickly for increases in signal
which would cause clipping, and provides a total
dynamic range of >45 dB.
73K222AU
Single-Chip Modem
with UART
SPECIAL DETECT CIRCUITRY
The special detect circuitry monitors the received
analog signal to determine status or presence of
carrier, call-progress tones, answer tone, and weak
received signal (long loop condition). An
unscrambled mark signal is also detected when the
received data out of the DPSK demodulator before
the descrambler has been high for 165.5 mS ±13.5
mS. The appropriate status bit is set when one of
these conditions changes and an interrupt is
generated for all monitored conditions except long
loop. The interrupts are disabled (masked) when the
enable interrupt bit is set to a 0.
DTMF GENERATOR
The DTMF generator will output one of 16 standard
dual-tones determined by a 4-bit binary value and
TX DTMF mode bit previously loaded into the tone
register. Tone generation is initiated when the DTMF
mode is selected and the transmit enable (CR0 bit
D1) is changed from a 0 to a 1.
TEST FEATURES
Test features such as analog loopback (ALB),
remote digital loopback, local digital loopback, and
internal pattern generators are also included.
LINE INTERFACE
The line interface of the 73K222AU consists of a
two-to-four wire hybrid, and an off-hook relay driver.
The two-to-four wire converter has a differential
transmit output and requires only a line transformer
and an external impedance matching resistor. Four-
wire operation is also available by simply using
either of the transmit output signals.
The relay driver output of the 73K222AU is an open
drain signal capable of sinking 20 mA, which can
control a line closure relay used to take the line off
hook and to perform pulse dialing.
AUDIO MONITOR
An audio monitor output is provided which has a
software programmable volume control. Its output is
the received signal. The audio monitor output can
directly drive a high impedance load, but an external
power amplifier is necessary to drive a low-impedance
speaker.
3


3Pages


73K222AU-IP 電子部品, 半導体
73K222AU
Single-Chip Modem
with UART
UART INTERFACE (continued)
NAME
TXD
DIP PLCC TYPE DESCRIPTION
7 9 O Function is determined by STNDLN pin and bit 7, Tone Control
Register:
STNDLN D7
0 0 TXD is a serial output of UART.
1 0 TXD is forced to a mark.
X 1 TXD is a serial output of UART.
ANALOG / LINE INTERFACE
TXA1
TXA2
RXA
SPKR
OH
34
45
16 18
17 19
18 20
O (differential) Transmitted Analog. These pins provide the analog
O output signals to be transmitted to the phone line. The drivers
will differentially drive the impedance of the line transformer and
the line matching resistor. An external hybrid can also be built
using TXA1 as a single ended transmit signal.
I Received Analog. This pin inputs analog information that is being
received by the two-to-four wire hybrid. This input can also be
taken directly from an external hybrid.
O Speaker Output. This pin outputs the received signal through a
programmable attenuator stage, which can be used for volume
control and disabling the speaker.
O Off-hook relay driver. This signal is an open drain output capable
of sinking 20 mA and is used for controlling a relay. The output
is the complement of the OH register bit in CR3.
6

6 Page



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共有リンク

Link :


部品番号部品説明メーカ
73K222AU-IH

74ACT16254 Modem with UART

ETC
ETC
73K222AU-IH

Single-Chip Modem Modem with UART

ETC
ETC
73K222AU-IP

74ACT16254 Modem with UART

ETC
ETC
73K222AU-IP

Single-Chip Modem Modem with UART

ETC
ETC


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