73K224BL-IHR/F データシートの表示（PDF） - Teridian Semiconductor Corporation

部品番号

コンポーネント説明

メーカー

73K224BL-IHR/F

V.22bis, V.22, V.21, Bell 212A, 103 Single-Chip Modem w/ Integrated Hybrid

Teridian Semiconductor Corporation 

73K224BL

V.22bis, V.22, V.21, Bell 212A, 103

Single-Chip Modem w/ Integrated Hybrid

DATA SHEET

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

FUNCTIONAL DESCRIPTION (continued)

(originate mark and space) and 2225 and 2025 Hz

(answer mark and space) are used when this

mode is selected. V.21 mode uses 980 and 1180

Hz (originate, mark and space) or 1650 and 1850

Page: 2 of 33

© 2005, 2008 TERIDIAN Semiconductor Corporation

Rev 7.1

Share Link: