73K224L 데이터 시트보기 (PDF) - TDK Corporation

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73K224L

V.22bis/V.22/V.21/ Bell 212A/Bell 103 Single-Chip Modem

TDK Corporation 

73K224L

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

Single-Chip Modem

DETECT REGISTER (continued)

D7

D6

D5

D4

D3

D2

D1

D0

DR

RECEIVE

S1

RECEIVE UNSCR.

CARR.

ANSWER

CALL

SIGNAL

010

LEVEL

PATTERN DATA

MARK

DETECT

TONE

PROG.

QUALITY

INDICATOR DETECT

DETECT

DETECT

INDICATOR

BIT NO.

D2

D3

D4

D5

D6

D7

NAME

Answer Tone

Received

Carrier Detect

Unscrambled

Mark Detect

Receive Data

S1 Pattern

Detect

Receive Level

Indicator

CONDITION

0

1

0

1

0

1

0

1

0

1

DESCRIPTION

No answer tone detected.

In Call Init mode, indicates detection of 2225 Hz answer

tone in Bell mode (TR bit D0=0) or 2100 Hz if in CCITT

mode (TR bit D0=1). The device must be in originate mode

for detection of answer tone. Both answer tones are

detected in demod mode.

No carrier detected in the receive channel.

Indicated carrier has been detected in the received

channel.

No unscrambled mark.

Indicates detection of unscrambled marks in the received

data. Should be time qualified by software.

Continuously outputs the received data stream. This data is

the same as that output on the RXD pin, but it is not

disabled when RXD is tri-stated.

No S1 pattern being received.

S1 pattern detected. Should be time qualified by software.

S1 pattern is defined as a double di-bit (001100..)

unscrambled 1200 bit/s DPSK signal. Pattern must be

aligned with baud clock to be detected.

Received signal level below threshold, (typical ≈ -25 dBm0); can

use receive gain boost (+18 dB).

Received signal above threshold.

TONE REGISTER

TR

011

BIT NO.

D7

D6

RXD

OUTPUT

CONTR.

TRANSMIT

GUARD

TONE

NAME

D5

D4

D3

TRANSMIT

ANSWER

TONE

TRANSMIT

DTMF

DTMF 3

CONDITION DESCRIPTION

D2

DTMF 2

D1

DTMF 1/

EXTENDED

OVER- SPEED

D0

DTMF 0/

ANSWER/

GUARD

D6 D5 D4 D0 D0 interacts with bits D6, D5, and D4 as shown.

D0

DTMF 0/

X X 1 X Transmit DTMF tones.

Answer/ Guard

Tone

X1

0 0 Select Bell mode answer tone. Interacts with DR bit D2 and

TR bit D5.

X 1 0 1 Select CCITT mode answer tone. Interacts with DR bit D2

and TR bit D5.

11

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