73k222al ETC-unknow, 73k222al Datasheet - Page 12

• Manufacturer Part Number: 73k222al
• Description: V.22, V.21, Bell 212a, Single-chip Modem
• Manufacturer: ETC-unknow

73K222AL
V.22, V.21, Bell 212A, 103
Single-Chip
DETECT REGISTER
BIT NO.
D2
D3
D4
D5
D6, D7
TONE REGISTER
BIT NO.
D0
D1
010
011
DR
TR
OUTPUT
CONTR.
RXD
D7
D7
X
Receive Data
Answer Tone
Unscrambled
Mark Detect
Guard Tone
Overspeed
Not Used
DTMF 0/
DTMF 1/
Answer/
(continued)
Carrier
NAME
Detect
Detect
NAME
TRANSMIT
GUARD
TONE
D6
D6
X
D6 D5 D4 D0
X
X
X
X
X
1
1
TRANSMIT
RECEIVE
ANSWER
CONDITION
CONDITION
DATA
Undefined
TONE
D4 D1
D5
D5
X
0
1
0
1
0
0
0
0
0
1
0
1
0
1
1
0
0
0
0
0
0
0
1
X
0
0
1
1
0
1
TRANSMIT
UNSCR.
MARK
DTMF
D4
D4
12
DESCRIPTION
No answer tone detected.
Indicates detection of 2225 Hz answer tone in Bell mode
or 2100 Hz in CCITT mode. The device must be in
originate mode for detection of answer tone. For CCITT
answer tone detection, bit D0 of the Tone Register must
be set to a 1.
No carrier detected in the receive channel.
Indicates carrier has been detected in the receive
channel.
No unscrambled mark.
Indicates detection of unscrambled marks in the received
data. A valid indication requires that unscrambled marks
be received for > 165.5 ± 6.5 ms.
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.
Not used. Mask in software.
DESCRIPTION
D0 interacts with bits D6, D5, and D4 as shown.
Transmit DTMF tones.
Detects 2225 Hz in originate mode.
Transmits 2225 Hz in answer mode (Bell).
Detects 2100 Hz in originate mode.
Transmits 2100 Hz in answer mode (CCITT).
Select 1800 Hz guard tone.
Select 550 Hz guard tone.
D1 interacts with D4 as shown.
Asynchronous DPSK +1.0% -2.5%.
Asynchronous DPSK +2.3% -2.5%.
DETECT
DTMF 3
CARR.
D3
D3
ANSWER
DTMF 2
TONE
D2
D2
DTMF 1/
PROG.
SPEED
OVER-
CALL
D1
D1
ANSWER/
DTMF 0/
GUARD
LONG
LOOP
D0
D0